From d766ecd7b2f211600cda41142d5292b6535d532e Mon Sep 17 00:00:00 2001
From: Sander de Smalen <sander.desmalen@arm.com>
Date: Wed, 31 Jan 2024 09:04:13 +0000
Subject: [PATCH] [SME] Stop RA from coalescing COPY instructions that
 transcend beyond smstart/smstop. (#78294)

This patch introduces a 'COALESCER_BARRIER' which is a pseudo node that
expands to
a 'nop', but which stops the register allocator from coalescing a COPY
node when
its use/def crosses a SMSTART or SMSTOP instruction.

For example:

    %0:fpr64 = COPY killed $d0
    undef %2.dsub:zpr = COPY %0       // <- Do not coalesce this COPY
    ADJCALLSTACKDOWN 0, 0
MSRpstatesvcrImm1 1, 0, csr_aarch64_smstartstop, implicit-def dead $d0
    $d0 = COPY killed %0
    BL @use_f64, csr_aarch64_aapcs

If the COPY would be coalesced, that would lead to:

    $d0 = COPY killed %0

being replaced by:

    $d0 = COPY killed %2.dsub

which means the whole ZPR reg would be live upto the call, causing the
MSRpstatesvcrImm1 (smstop) to spill/reload the ZPR register:

    str     q0, [sp]   // 16-byte Folded Spill
    smstop  sm
    ldr     z0, [sp]   // 16-byte Folded Reload
    bl      use_f64

which would be incorrect for two reasons:
1. The program may load more data than it has allocated.
2. If there are other SVE objects on the stack, the compiler might use
the
   'mul vl' addressing modes to access the spill location.

By disabling the coalescing, we get the desired results:

    str     d0, [sp, #8]  // 8-byte Folded Spill
    smstop  sm
    ldr     d0, [sp, #8]  // 8-byte Folded Reload
    bl      use_f64

(cherry picked from commit dd736661826e215ac70ff3a4a4ccd75bda0c5ccd)
---
 .../AArch64/AArch64ExpandPseudoInsts.cpp      |    6 +
 .../Target/AArch64/AArch64ISelLowering.cpp    |   24 +-
 llvm/lib/Target/AArch64/AArch64ISelLowering.h |    4 +-
 .../Target/AArch64/AArch64RegisterInfo.cpp    |   35 +
 .../lib/Target/AArch64/AArch64SMEInstrInfo.td |   22 +
 .../AArch64/sme-disable-gisel-fisel.ll        |   20 +-
 ...ate-sm-changing-call-disable-coalescing.ll | 1640 +++++++++++++++++
 .../CodeGen/AArch64/sme-streaming-body.ll     |    4 +
 .../sme-streaming-compatible-interface.ll     |   29 +-
 .../AArch64/sme-streaming-interface.ll        |   12 +-
 ...nging-call-disable-stackslot-scavenging.ll |    2 +-
 11 files changed, 1769 insertions(+), 29 deletions(-)
 create mode 100644 llvm/test/CodeGen/AArch64/sme-pstate-sm-changing-call-disable-coalescing.ll

diff --git a/llvm/lib/Target/AArch64/AArch64ExpandPseudoInsts.cpp b/llvm/lib/Target/AArch64/AArch64ExpandPseudoInsts.cpp
index 352c61d48e2fff..1af064b6de3cba 100644
--- a/llvm/lib/Target/AArch64/AArch64ExpandPseudoInsts.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ExpandPseudoInsts.cpp
@@ -1544,6 +1544,12 @@ bool AArch64ExpandPseudo::expandMI(MachineBasicBlock &MBB,
        NextMBBI = MBB.end(); // The NextMBBI iterator is invalidated.
      return true;
    }
+   case AArch64::COALESCER_BARRIER_FPR16:
+   case AArch64::COALESCER_BARRIER_FPR32:
+   case AArch64::COALESCER_BARRIER_FPR64:
+   case AArch64::COALESCER_BARRIER_FPR128:
+     MI.eraseFromParent();
+     return true;
    case AArch64::LD1B_2Z_IMM_PSEUDO:
      return expandMultiVecPseudo(
          MBB, MBBI, AArch64::ZPR2RegClass, AArch64::ZPR2StridedRegClass,
diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
index 332fb37655288c..a59b1f2ec3c1c1 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -2375,6 +2375,7 @@ const char *AArch64TargetLowering::getTargetNodeName(unsigned Opcode) const {
   switch ((AArch64ISD::NodeType)Opcode) {
   case AArch64ISD::FIRST_NUMBER:
     break;
+    MAKE_CASE(AArch64ISD::COALESCER_BARRIER)
     MAKE_CASE(AArch64ISD::SMSTART)
     MAKE_CASE(AArch64ISD::SMSTOP)
     MAKE_CASE(AArch64ISD::RESTORE_ZA)
@@ -7154,13 +7155,18 @@ void AArch64TargetLowering::saveVarArgRegisters(CCState &CCInfo,
   }
 }
 
+static bool isPassedInFPR(EVT VT) {
+  return VT.isFixedLengthVector() ||
+         (VT.isFloatingPoint() && !VT.isScalableVector());
+}
+
 /// LowerCallResult - Lower the result values of a call into the
 /// appropriate copies out of appropriate physical registers.
 SDValue AArch64TargetLowering::LowerCallResult(
     SDValue Chain, SDValue InGlue, CallingConv::ID CallConv, bool isVarArg,
     const SmallVectorImpl<CCValAssign> &RVLocs, const SDLoc &DL,
     SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals, bool isThisReturn,
-    SDValue ThisVal) const {
+    SDValue ThisVal, bool RequiresSMChange) const {
   DenseMap<unsigned, SDValue> CopiedRegs;
   // Copy all of the result registers out of their specified physreg.
   for (unsigned i = 0; i != RVLocs.size(); ++i) {
@@ -7205,6 +7211,10 @@ SDValue AArch64TargetLowering::LowerCallResult(
       break;
     }
 
+    if (RequiresSMChange && isPassedInFPR(VA.getValVT()))
+      Val = DAG.getNode(AArch64ISD::COALESCER_BARRIER, DL, Val.getValueType(),
+                        Val);
+
     InVals.push_back(Val);
   }
 
@@ -7915,6 +7925,12 @@ AArch64TargetLowering::LowerCall(CallLoweringInfo &CLI,
           return ArgReg.Reg == VA.getLocReg();
         });
       } else {
+        // Add an extra level of indirection for streaming mode changes by
+        // using a pseudo copy node that cannot be rematerialised between a
+        // smstart/smstop and the call by the simple register coalescer.
+        if (RequiresSMChange && isPassedInFPR(Arg.getValueType()))
+          Arg = DAG.getNode(AArch64ISD::COALESCER_BARRIER, DL,
+                            Arg.getValueType(), Arg);
         RegsToPass.emplace_back(VA.getLocReg(), Arg);
         RegsUsed.insert(VA.getLocReg());
         const TargetOptions &Options = DAG.getTarget().Options;
@@ -8151,9 +8167,9 @@ AArch64TargetLowering::LowerCall(CallLoweringInfo &CLI,
 
   // Handle result values, copying them out of physregs into vregs that we
   // return.
-  SDValue Result = LowerCallResult(Chain, InGlue, CallConv, IsVarArg, RVLocs,
-                                   DL, DAG, InVals, IsThisReturn,
-                                   IsThisReturn ? OutVals[0] : SDValue());
+  SDValue Result = LowerCallResult(
+      Chain, InGlue, CallConv, IsVarArg, RVLocs, DL, DAG, InVals, IsThisReturn,
+      IsThisReturn ? OutVals[0] : SDValue(), RequiresSMChange);
 
   if (!Ins.empty())
     InGlue = Result.getValue(Result->getNumValues() - 1);
diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.h b/llvm/lib/Target/AArch64/AArch64ISelLowering.h
index 6505931e17e18d..541a810fb5cba0 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.h
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.h
@@ -58,6 +58,8 @@ enum NodeType : unsigned {
 
   CALL_BTI, // Function call followed by a BTI instruction.
 
+  COALESCER_BARRIER,
+
   SMSTART,
   SMSTOP,
   RESTORE_ZA,
@@ -1026,7 +1028,7 @@ class AArch64TargetLowering : public TargetLowering {
                           const SmallVectorImpl<CCValAssign> &RVLocs,
                           const SDLoc &DL, SelectionDAG &DAG,
                           SmallVectorImpl<SDValue> &InVals, bool isThisReturn,
-                          SDValue ThisVal) const;
+                          SDValue ThisVal, bool RequiresSMChange) const;
 
   SDValue LowerLOAD(SDValue Op, SelectionDAG &DAG) const;
   SDValue LowerSTORE(SDValue Op, SelectionDAG &DAG) const;
diff --git a/llvm/lib/Target/AArch64/AArch64RegisterInfo.cpp b/llvm/lib/Target/AArch64/AArch64RegisterInfo.cpp
index ea9882160d6fb2..f86e6947c9cdb0 100644
--- a/llvm/lib/Target/AArch64/AArch64RegisterInfo.cpp
+++ b/llvm/lib/Target/AArch64/AArch64RegisterInfo.cpp
@@ -1015,6 +1015,8 @@ bool AArch64RegisterInfo::shouldCoalesce(
     MachineInstr *MI, const TargetRegisterClass *SrcRC, unsigned SubReg,
     const TargetRegisterClass *DstRC, unsigned DstSubReg,
     const TargetRegisterClass *NewRC, LiveIntervals &LIS) const {
+  MachineRegisterInfo &MRI = MI->getMF()->getRegInfo();
+
   if (MI->isCopy() &&
       ((DstRC->getID() == AArch64::GPR64RegClassID) ||
        (DstRC->getID() == AArch64::GPR64commonRegClassID)) &&
@@ -1023,5 +1025,38 @@ bool AArch64RegisterInfo::shouldCoalesce(
     // which implements a 32 to 64 bit zero extension
     // which relies on the upper 32 bits being zeroed.
     return false;
+
+  auto IsCoalescerBarrier = [](const MachineInstr &MI) {
+    switch (MI.getOpcode()) {
+    case AArch64::COALESCER_BARRIER_FPR16:
+    case AArch64::COALESCER_BARRIER_FPR32:
+    case AArch64::COALESCER_BARRIER_FPR64:
+    case AArch64::COALESCER_BARRIER_FPR128:
+      return true;
+    default:
+      return false;
+    }
+  };
+
+  // For calls that temporarily have to toggle streaming mode as part of the
+  // call-sequence, we need to be more careful when coalescing copy instructions
+  // so that we don't end up coalescing the NEON/FP result or argument register
+  // with a whole Z-register, such that after coalescing the register allocator
+  // will try to spill/reload the entire Z register.
+  //
+  // We do this by checking if the node has any defs/uses that are
+  // COALESCER_BARRIER pseudos. These are 'nops' in practice, but they exist to
+  // instruct the coalescer to avoid coalescing the copy.
+  if (MI->isCopy() && SubReg != DstSubReg &&
+      (AArch64::ZPRRegClass.hasSubClassEq(DstRC) ||
+       AArch64::ZPRRegClass.hasSubClassEq(SrcRC))) {
+    unsigned SrcReg = MI->getOperand(1).getReg();
+    if (any_of(MRI.def_instructions(SrcReg), IsCoalescerBarrier))
+      return false;
+    unsigned DstReg = MI->getOperand(0).getReg();
+    if (any_of(MRI.use_nodbg_instructions(DstReg), IsCoalescerBarrier))
+      return false;
+  }
+
   return true;
 }
diff --git a/llvm/lib/Target/AArch64/AArch64SMEInstrInfo.td b/llvm/lib/Target/AArch64/AArch64SMEInstrInfo.td
index eeae5303a3f898..acf067f2cc5a9d 100644
--- a/llvm/lib/Target/AArch64/AArch64SMEInstrInfo.td
+++ b/llvm/lib/Target/AArch64/AArch64SMEInstrInfo.td
@@ -28,6 +28,8 @@ def AArch64_restore_zt : SDNode<"AArch64ISD::RESTORE_ZT", SDTypeProfile<0, 2,
 def AArch64_save_zt : SDNode<"AArch64ISD::SAVE_ZT", SDTypeProfile<0, 2,
                              [SDTCisInt<0>, SDTCisPtrTy<1>]>,
                              [SDNPHasChain, SDNPSideEffect, SDNPMayStore]>;
+def AArch64CoalescerBarrier
+    : SDNode<"AArch64ISD::COALESCER_BARRIER", SDTypeProfile<1, 1, []>, []>;
 
 //===----------------------------------------------------------------------===//
 // Instruction naming conventions.
@@ -189,6 +191,26 @@ def : Pat<(int_aarch64_sme_set_tpidr2 i64:$val),
           (MSR 0xde85, GPR64:$val)>;
 def : Pat<(i64 (int_aarch64_sme_get_tpidr2)),
           (MRS 0xde85)>;
+
+multiclass CoalescerBarrierPseudo<RegisterClass rc, list<ValueType> vts> {
+  def NAME : Pseudo<(outs rc:$dst), (ins rc:$src), []>, Sched<[]> {
+    let Constraints = "$dst = $src";
+  }
+  foreach vt = vts in {
+    def : Pat<(vt (AArch64CoalescerBarrier (vt rc:$src))),
+              (!cast<Instruction>(NAME) rc:$src)>;
+  }
+}
+
+multiclass CoalescerBarriers {
+  defm _FPR16  : CoalescerBarrierPseudo<FPR16, [bf16, f16]>;
+  defm _FPR32  : CoalescerBarrierPseudo<FPR32, [f32]>;
+  defm _FPR64  : CoalescerBarrierPseudo<FPR64, [f64, v8i8, v4i16, v2i32, v1i64, v4f16, v2f32, v1f64, v4bf16]>;
+  defm _FPR128 : CoalescerBarrierPseudo<FPR128, [f128, v16i8, v8i16, v4i32, v2i64, v8f16, v4f32, v2f64, v8bf16]>;
+}
+
+defm COALESCER_BARRIER : CoalescerBarriers;
+
 } // End let Predicates = [HasSME]
 
 // Pseudo to match to smstart/smstop. This expands:
diff --git a/llvm/test/CodeGen/AArch64/sme-disable-gisel-fisel.ll b/llvm/test/CodeGen/AArch64/sme-disable-gisel-fisel.ll
index e18e18a1cfad18..381091b4539433 100644
--- a/llvm/test/CodeGen/AArch64/sme-disable-gisel-fisel.ll
+++ b/llvm/test/CodeGen/AArch64/sme-disable-gisel-fisel.ll
@@ -23,9 +23,9 @@ define double @nonstreaming_caller_streaming_callee(double %x) nounwind noinline
 ; CHECK-FISEL-NEXT:    bl streaming_callee
 ; CHECK-FISEL-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
 ; CHECK-FISEL-NEXT:    smstop sm
+; CHECK-FISEL-NEXT:    ldr d1, [sp, #8] // 8-byte Folded Reload
 ; CHECK-FISEL-NEXT:    adrp x8, .LCPI0_0
 ; CHECK-FISEL-NEXT:    ldr d0, [x8, :lo12:.LCPI0_0]
-; CHECK-FISEL-NEXT:    ldr d1, [sp, #8] // 8-byte Folded Reload
 ; CHECK-FISEL-NEXT:    fadd d0, d1, d0
 ; CHECK-FISEL-NEXT:    ldr x30, [sp, #80] // 8-byte Folded Reload
 ; CHECK-FISEL-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
@@ -49,9 +49,9 @@ define double @nonstreaming_caller_streaming_callee(double %x) nounwind noinline
 ; CHECK-GISEL-NEXT:    bl streaming_callee
 ; CHECK-GISEL-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
 ; CHECK-GISEL-NEXT:    smstop sm
+; CHECK-GISEL-NEXT:    ldr d1, [sp, #8] // 8-byte Folded Reload
 ; CHECK-GISEL-NEXT:    mov x8, #4631107791820423168 // =0x4045000000000000
 ; CHECK-GISEL-NEXT:    fmov d0, x8
-; CHECK-GISEL-NEXT:    ldr d1, [sp, #8] // 8-byte Folded Reload
 ; CHECK-GISEL-NEXT:    fadd d0, d1, d0
 ; CHECK-GISEL-NEXT:    ldr x30, [sp, #80] // 8-byte Folded Reload
 ; CHECK-GISEL-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
@@ -82,9 +82,9 @@ define double @streaming_caller_nonstreaming_callee(double %x) nounwind noinline
 ; CHECK-COMMON-NEXT:    bl normal_callee
 ; CHECK-COMMON-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
 ; CHECK-COMMON-NEXT:    smstart sm
+; CHECK-COMMON-NEXT:    ldr d1, [sp, #8] // 8-byte Folded Reload
 ; CHECK-COMMON-NEXT:    mov x8, #4631107791820423168 // =0x4045000000000000
 ; CHECK-COMMON-NEXT:    fmov d0, x8
-; CHECK-COMMON-NEXT:    ldr d1, [sp, #8] // 8-byte Folded Reload
 ; CHECK-COMMON-NEXT:    fadd d0, d1, d0
 ; CHECK-COMMON-NEXT:    ldr x30, [sp, #80] // 8-byte Folded Reload
 ; CHECK-COMMON-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
@@ -110,14 +110,16 @@ define double @locally_streaming_caller_normal_callee(double %x) nounwind noinli
 ; CHECK-COMMON-NEXT:    str x30, [sp, #96] // 8-byte Folded Spill
 ; CHECK-COMMON-NEXT:    str d0, [sp, #24] // 8-byte Folded Spill
 ; CHECK-COMMON-NEXT:    smstart sm
+; CHECK-COMMON-NEXT:    ldr d0, [sp, #24] // 8-byte Folded Reload
+; CHECK-COMMON-NEXT:    str d0, [sp, #24] // 8-byte Folded Spill
 ; CHECK-COMMON-NEXT:    smstop sm
 ; CHECK-COMMON-NEXT:    ldr d0, [sp, #24] // 8-byte Folded Reload
 ; CHECK-COMMON-NEXT:    bl normal_callee
 ; CHECK-COMMON-NEXT:    str d0, [sp, #16] // 8-byte Folded Spill
 ; CHECK-COMMON-NEXT:    smstart sm
+; CHECK-COMMON-NEXT:    ldr d1, [sp, #16] // 8-byte Folded Reload
 ; CHECK-COMMON-NEXT:    mov x8, #4631107791820423168 // =0x4045000000000000
 ; CHECK-COMMON-NEXT:    fmov d0, x8
-; CHECK-COMMON-NEXT:    ldr d1, [sp, #16] // 8-byte Folded Reload
 ; CHECK-COMMON-NEXT:    fadd d0, d1, d0
 ; CHECK-COMMON-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
 ; CHECK-COMMON-NEXT:    smstop sm
@@ -329,9 +331,9 @@ define fp128 @f128_call_sm(fp128 %a, fp128 %b) "aarch64_pstate_sm_enabled" nounw
 ; CHECK-COMMON-NEXT:    stp d11, d10, [sp, #64] // 16-byte Folded Spill
 ; CHECK-COMMON-NEXT:    stp d9, d8, [sp, #80] // 16-byte Folded Spill
 ; CHECK-COMMON-NEXT:    str x30, [sp, #96] // 8-byte Folded Spill
-; CHECK-COMMON-NEXT:    stp q0, q1, [sp] // 32-byte Folded Spill
+; CHECK-COMMON-NEXT:    stp q1, q0, [sp] // 32-byte Folded Spill
 ; CHECK-COMMON-NEXT:    smstop sm
-; CHECK-COMMON-NEXT:    ldp q0, q1, [sp] // 32-byte Folded Reload
+; CHECK-COMMON-NEXT:    ldp q1, q0, [sp] // 32-byte Folded Reload
 ; CHECK-COMMON-NEXT:    bl __addtf3
 ; CHECK-COMMON-NEXT:    str q0, [sp, #16] // 16-byte Folded Spill
 ; CHECK-COMMON-NEXT:    smstart sm
@@ -390,9 +392,9 @@ define float @frem_call_sm(float %a, float %b) "aarch64_pstate_sm_enabled" nounw
 ; CHECK-COMMON-NEXT:    stp d11, d10, [sp, #48] // 16-byte Folded Spill
 ; CHECK-COMMON-NEXT:    stp d9, d8, [sp, #64] // 16-byte Folded Spill
 ; CHECK-COMMON-NEXT:    str x30, [sp, #80] // 8-byte Folded Spill
-; CHECK-COMMON-NEXT:    stp s0, s1, [sp, #8] // 8-byte Folded Spill
+; CHECK-COMMON-NEXT:    stp s1, s0, [sp, #8] // 8-byte Folded Spill
 ; CHECK-COMMON-NEXT:    smstop sm
-; CHECK-COMMON-NEXT:    ldp s0, s1, [sp, #8] // 8-byte Folded Reload
+; CHECK-COMMON-NEXT:    ldp s1, s0, [sp, #8] // 8-byte Folded Reload
 ; CHECK-COMMON-NEXT:    bl fmodf
 ; CHECK-COMMON-NEXT:    str s0, [sp, #12] // 4-byte Folded Spill
 ; CHECK-COMMON-NEXT:    smstart sm
@@ -420,7 +422,9 @@ define float @frem_call_sm_compat(float %a, float %b) "aarch64_pstate_sm_compati
 ; CHECK-COMMON-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
 ; CHECK-COMMON-NEXT:    stp s0, s1, [sp, #8] // 8-byte Folded Spill
 ; CHECK-COMMON-NEXT:    bl __arm_sme_state
+; CHECK-COMMON-NEXT:    ldp s2, s0, [sp, #8] // 8-byte Folded Reload
 ; CHECK-COMMON-NEXT:    and x19, x0, #0x1
+; CHECK-COMMON-NEXT:    stp s2, s0, [sp, #8] // 8-byte Folded Spill
 ; CHECK-COMMON-NEXT:    tbz w19, #0, .LBB12_2
 ; CHECK-COMMON-NEXT:  // %bb.1:
 ; CHECK-COMMON-NEXT:    smstop sm
diff --git a/llvm/test/CodeGen/AArch64/sme-pstate-sm-changing-call-disable-coalescing.ll b/llvm/test/CodeGen/AArch64/sme-pstate-sm-changing-call-disable-coalescing.ll
new file mode 100644
index 00000000000000..d5bea725b6d14d
--- /dev/null
+++ b/llvm/test/CodeGen/AArch64/sme-pstate-sm-changing-call-disable-coalescing.ll
@@ -0,0 +1,1640 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 2
+; RUN: llc < %s | FileCheck %s
+
+target triple = "aarch64-unknown-unknown-eabi-elf"
+
+; This test verifies that call arguments and results are not coalesced
+; with SVE vector registers by the coalescer, such that no 'mul vl'
+; ldr/str pairs are generated in the streaming-mode-changing call
+; sequence.
+
+;
+; Scalar arguments
+;
+
+define void @dont_coalesce_arg_i8(i8 %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_i8:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    fmov s0, w0
+; CHECK-NEXT:    mov x19, x1
+; CHECK-NEXT:    str z0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl use_i8
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.b
+; CHECK-NEXT:    ldr z0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    st1b { z0.b }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %vec = insertelement <vscale x 16 x i8> poison, i8 %arg, i32 0
+  call void @use_i8(i8 %arg)
+  store <vscale x 16 x i8> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_arg_i16(i16 %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_i16:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    fmov s0, w0
+; CHECK-NEXT:    mov x19, x1
+; CHECK-NEXT:    str z0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl use_i16
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.h
+; CHECK-NEXT:    ldr z0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    st1h { z0.h }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %vec = insertelement <vscale x 8 x i16> poison, i16 %arg, i32 0
+  call void @use_i16(i16 %arg)
+  store <vscale x 8 x i16> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_arg_i32(i32 %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_i32:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    fmov s0, w0
+; CHECK-NEXT:    mov x19, x1
+; CHECK-NEXT:    str z0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl use_i32
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.s
+; CHECK-NEXT:    ldr z0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    st1w { z0.s }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %vec = insertelement <vscale x 4 x i32> poison, i32 %arg, i32 0
+  call void @use_i32(i32 %arg)
+  store <vscale x 4 x i32> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_arg_i64(i64 %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_i64:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    fmov d0, x0
+; CHECK-NEXT:    mov x19, x1
+; CHECK-NEXT:    str z0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl use_i64
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.d
+; CHECK-NEXT:    ldr z0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    st1d { z0.d }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %vec = insertelement <vscale x 2 x i64> poison, i64 %arg, i32 0
+  call void @use_i64(i64 %arg)
+  store <vscale x 2 x i64> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_arg_f16(half %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_f16:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    // kill: def $h0 killed $h0 def $z0
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    str z0, [x8] // 16-byte Folded Spill
+; CHECK-NEXT:    // kill: def $h0 killed $h0 killed $z0
+; CHECK-NEXT:    str h0, [sp, #14] // 2-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    ldr h0, [sp, #14] // 2-byte Folded Reload
+; CHECK-NEXT:    bl use_f16
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.h
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr z0, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    st1h { z0.h }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %vec = insertelement <vscale x 8 x half> poison, half %arg, i32 0
+  call void @use_f16(half %arg)
+  store <vscale x 8 x half> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_arg_f32(float %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_f32:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    // kill: def $s0 killed $s0 def $z0
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    str z0, [x8] // 16-byte Folded Spill
+; CHECK-NEXT:    // kill: def $s0 killed $s0 killed $z0
+; CHECK-NEXT:    str s0, [sp, #12] // 4-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    ldr s0, [sp, #12] // 4-byte Folded Reload
+; CHECK-NEXT:    bl use_f32
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.s
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr z0, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    st1w { z0.s }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %vec = insertelement <vscale x 4 x float> poison, float %arg, i32 0
+  call void @use_f32(float %arg)
+  store <vscale x 4 x float> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_arg_f64(double %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_f64:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    // kill: def $d0 killed $d0 def $z0
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    str z0, [x8] // 16-byte Folded Spill
+; CHECK-NEXT:    // kill: def $d0 killed $d0 killed $z0
+; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
+; CHECK-NEXT:    bl use_f64
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.d
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr z0, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    st1d { z0.d }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %vec = insertelement <vscale x 2 x double> poison, double %arg, i32 0
+  call void @use_f64(double %arg)
+  store <vscale x 2 x double> %vec, ptr %ptr
+  ret void
+}
+
+
+;
+; Single-element vector arguments
+;
+
+define void @dont_coalesce_arg_v1i8(<1 x i8> %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_v1i8:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    // kill: def $d0 killed $d0 def $z0
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    str z0, [x8] // 16-byte Folded Spill
+; CHECK-NEXT:    // kill: def $d0 killed $d0 killed $z0
+; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
+; CHECK-NEXT:    bl use_v16i8
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.b
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr z0, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    st1b { z0.b }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %elt = extractelement <1 x i8> %arg, i32 0
+  %vec = insertelement <vscale x 16 x i8> poison, i8 %elt, i32 0
+  call void @use_v16i8(<1 x i8> %arg)
+  store <vscale x 16 x i8> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_arg_v1i16(<1 x i16> %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_v1i16:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    // kill: def $d0 killed $d0 def $z0
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    str z0, [x8] // 16-byte Folded Spill
+; CHECK-NEXT:    // kill: def $d0 killed $d0 killed $z0
+; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
+; CHECK-NEXT:    bl use_v8i16
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.h
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr z0, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    st1h { z0.h }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %elt = extractelement <1 x i16> %arg, i32 0
+  %vec = insertelement <vscale x 8 x i16> poison, i16 %elt, i32 0
+  call void @use_v8i16(<1 x i16> %arg)
+  store <vscale x 8 x i16> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_arg_v1i32(<1 x i32> %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_v1i32:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    // kill: def $d0 killed $d0 def $z0
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    str z0, [x8] // 16-byte Folded Spill
+; CHECK-NEXT:    // kill: def $d0 killed $d0 killed $z0
+; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
+; CHECK-NEXT:    bl use_v4i32
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.s
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr z0, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    st1w { z0.s }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %elt = extractelement <1 x i32> %arg, i32 0
+  %vec = insertelement <vscale x 4 x i32> poison, i32 %elt, i32 0
+  call void @use_v4i32(<1 x i32> %arg)
+  store <vscale x 4 x i32> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_arg_v1i64(<1 x i64> %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_v1i64:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    // kill: def $d0 killed $d0 def $z0
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    str z0, [x8] // 16-byte Folded Spill
+; CHECK-NEXT:    // kill: def $d0 killed $d0 killed $z0
+; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
+; CHECK-NEXT:    bl use_v2i64
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.d
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr z0, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    st1d { z0.d }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %elt = extractelement <1 x i64> %arg, i32 0
+  %vec = insertelement <vscale x 2 x i64> poison, i64 %elt, i32 0
+  call void @use_v2i64(<1 x i64> %arg)
+  store <vscale x 2 x i64> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_arg_v1f16(<1 x half> %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_v1f16:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    // kill: def $h0 killed $h0 def $z0
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    str z0, [x8] // 16-byte Folded Spill
+; CHECK-NEXT:    // kill: def $h0 killed $h0 killed $z0
+; CHECK-NEXT:    str h0, [sp, #14] // 2-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    ldr h0, [sp, #14] // 2-byte Folded Reload
+; CHECK-NEXT:    bl use_v8f16
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.h
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr z0, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    st1h { z0.h }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %elt = extractelement <1 x half> %arg, i32 0
+  %vec = insertelement <vscale x 8 x half> poison, half %elt, i32 0
+  call void @use_v8f16(<1 x half> %arg)
+  store <vscale x 8 x half> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_arg_v1f32(<1 x float> %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_v1f32:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    // kill: def $d0 killed $d0 def $z0
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    str z0, [x8] // 16-byte Folded Spill
+; CHECK-NEXT:    // kill: def $d0 killed $d0 killed $z0
+; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
+; CHECK-NEXT:    bl use_v4f32
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.s
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr z0, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    st1w { z0.s }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %elt = extractelement <1 x float> %arg, i32 0
+  %vec = insertelement <vscale x 4 x float> poison, float %elt, i32 0
+  call void @use_v4f32(<1 x float> %arg)
+  store <vscale x 4 x float> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_arg_v1f64(<1 x double> %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_v1f64:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    // kill: def $d0 killed $d0 def $z0
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    str z0, [x8] // 16-byte Folded Spill
+; CHECK-NEXT:    // kill: def $d0 killed $d0 killed $z0
+; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
+; CHECK-NEXT:    bl use_v2f64
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.d
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr z0, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    st1d { z0.d }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %elt = extractelement <1 x double> %arg, i32 0
+  %vec = insertelement <vscale x 2 x double> poison, double %elt, i32 0
+  call void @use_v2f64(<1 x double> %arg)
+  store <vscale x 2 x double> %vec, ptr %ptr
+  ret void
+}
+
+;
+; Full vector arguments
+;
+
+define void @dont_coalesce_arg_v16i8(<16 x i8> %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_v16i8:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    // kill: def $q0 killed $q0 def $z0
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    str z0, [x8] // 16-byte Folded Spill
+; CHECK-NEXT:    // kill: def $q0 killed $q0 killed $z0
+; CHECK-NEXT:    str q0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    ldr q0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    bl use_v16i8
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.b
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr z0, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    st1b { z0.b }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %vec = call <vscale x 16 x i8> @llvm.vector.insert.nxv16i8.v16i8(<vscale x 16 x i8> poison, <16 x i8> %arg, i64 0)
+  call void @use_v16i8(<16 x i8> %arg)
+  store <vscale x 16 x i8> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_arg_v8i16(<8 x i16> %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_v8i16:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    // kill: def $q0 killed $q0 def $z0
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    str z0, [x8] // 16-byte Folded Spill
+; CHECK-NEXT:    // kill: def $q0 killed $q0 killed $z0
+; CHECK-NEXT:    str q0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    ldr q0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    bl use_v8i16
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.h
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr z0, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    st1h { z0.h }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %vec = call <vscale x 8 x i16> @llvm.vector.insert.nxv8i16.v8i16(<vscale x 8 x i16> poison, <8 x i16> %arg, i64 0)
+  call void @use_v8i16(<8 x i16> %arg)
+  store <vscale x 8 x i16> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_arg_v4i32(<4 x i32> %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_v4i32:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    // kill: def $q0 killed $q0 def $z0
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    str z0, [x8] // 16-byte Folded Spill
+; CHECK-NEXT:    // kill: def $q0 killed $q0 killed $z0
+; CHECK-NEXT:    str q0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    ldr q0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    bl use_v4i32
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.s
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr z0, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    st1w { z0.s }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %vec = call <vscale x 4 x i32> @llvm.vector.insert.nxv4i32.v4i32(<vscale x 4 x i32> poison, <4 x i32> %arg, i64 0)
+  call void @use_v4i32(<4 x i32> %arg)
+  store <vscale x 4 x i32> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_arg_v2i64(<2 x i64> %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_v2i64:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    // kill: def $q0 killed $q0 def $z0
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    str z0, [x8] // 16-byte Folded Spill
+; CHECK-NEXT:    // kill: def $q0 killed $q0 killed $z0
+; CHECK-NEXT:    str q0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    ldr q0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    bl use_v2i64
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.d
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr z0, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    st1d { z0.d }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %vec = call <vscale x 2 x i64> @llvm.vector.insert.nxv2i64.v2i64(<vscale x 2 x i64> poison, <2 x i64> %arg, i64 0)
+  call void @use_v2i64(<2 x i64> %arg)
+  store <vscale x 2 x i64> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_arg_v8f16(<8 x half> %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_v8f16:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    // kill: def $q0 killed $q0 def $z0
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    str z0, [x8] // 16-byte Folded Spill
+; CHECK-NEXT:    // kill: def $q0 killed $q0 killed $z0
+; CHECK-NEXT:    str q0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    ldr q0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    bl use_v8f16
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.h
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr z0, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    st1h { z0.h }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %vec = call <vscale x 8 x half> @llvm.vector.insert.nxv8f16.v8f16(<vscale x 8 x half> poison, <8 x half> %arg, i64 0)
+  call void @use_v8f16(<8 x half> %arg)
+  store <vscale x 8 x half> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_arg_v8bf16(<8 x bfloat> %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_v8bf16:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    // kill: def $q0 killed $q0 def $z0
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    str z0, [x8] // 16-byte Folded Spill
+; CHECK-NEXT:    // kill: def $q0 killed $q0 killed $z0
+; CHECK-NEXT:    str q0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    ldr q0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    bl use_v8bf16
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.h
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr z0, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    st1h { z0.h }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %vec = call <vscale x 8 x bfloat> @llvm.vector.insert.nxv8bf16.v8bf16(<vscale x 8 x bfloat> poison, <8 x bfloat> %arg, i64 0)
+  call void @use_v8bf16(<8 x bfloat> %arg)
+  store <vscale x 8 x bfloat> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_arg_v4f32(<4 x float> %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_v4f32:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    // kill: def $q0 killed $q0 def $z0
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    str z0, [x8] // 16-byte Folded Spill
+; CHECK-NEXT:    // kill: def $q0 killed $q0 killed $z0
+; CHECK-NEXT:    str q0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    ldr q0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    bl use_v4f32
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.d
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr z0, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    st1d { z0.d }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %vec = call <vscale x 4 x float> @llvm.vector.insert.nxv4f32.v4f32(<vscale x 4 x float> poison, <4 x float> %arg, i64 0)
+  call void @use_v4f32(<4 x float> %arg)
+  store <vscale x 4 x float> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_arg_v2f64(<2 x double> %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_v2f64:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    // kill: def $q0 killed $q0 def $z0
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    str z0, [x8] // 16-byte Folded Spill
+; CHECK-NEXT:    // kill: def $q0 killed $q0 killed $z0
+; CHECK-NEXT:    str q0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    ldr q0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    bl use_v2f64
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.d
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr z0, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    st1d { z0.d }, p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %vec = call <vscale x 2 x double> @llvm.vector.insert.nxv2f64.v2f64(<vscale x 2 x double> poison, <2 x double> %arg, i64 0)
+  call void @use_v2f64(<2 x double> %arg)
+  store <vscale x 2 x double> %vec, ptr %ptr
+  ret void
+}
+
+;
+; <8 x i1> type will need type promotion.
+;
+define void @dont_coalesce_arg_v8i1(<8 x i1> %arg, ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_arg_v8i1:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-96]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    ptrue p0.b
+; CHECK-NEXT:    // kill: def $d0 killed $d0 def $z0
+; CHECK-NEXT:    mov z1.d, z0.d
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    // kill: def $d0 killed $d0 killed $z0
+; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
+; CHECK-NEXT:    and z1.b, z1.b, #0x1
+; CHECK-NEXT:    cmpne p0.b, p0/z, z1.b, #0
+; CHECK-NEXT:    str p0, [x8, #7, mul vl] // 2-byte Folded Spill
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
+; CHECK-NEXT:    bl use_v8i1
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr p0, [x8, #7, mul vl] // 2-byte Folded Reload
+; CHECK-NEXT:    str p0, [x19]
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #96 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %vec = call <vscale x 16 x i1> @llvm.vector.insert.nxv8i1.v8i1(<vscale x 16 x i1> poison, <8 x i1> %arg, i64 0)
+  call void @use_v8i1(<8 x i1> %arg)
+  store <vscale x 16 x i1> %vec, ptr %ptr
+  ret void
+}
+
+;
+; Scalar return values
+;
+
+define void @dont_coalesce_res_i8(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_i8:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-80]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_i8
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.b
+; CHECK-NEXT:    fmov s0, w0
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1b { z0.b }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #80 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %res = call i8 @get_i8()
+  %vec = insertelement <vscale x 16 x i8> poison, i8 %res, i32 0
+  store <vscale x 16 x i8> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_res_i16(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_i16:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-80]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_i16
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.h
+; CHECK-NEXT:    fmov s0, w0
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1h { z0.h }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #80 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %res = call i16 @get_i16()
+  %vec = insertelement <vscale x 8 x i16> poison, i16 %res, i32 0
+  store <vscale x 8 x i16> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_res_i32(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_i32:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-80]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_i32
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.s
+; CHECK-NEXT:    fmov s0, w0
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1w { z0.s }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #80 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %res = call i32 @get_i32()
+  %vec = insertelement <vscale x 4 x i32> poison, i32 %res, i32 0
+  store <vscale x 4 x i32> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_res_i64(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_i64:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    stp d15, d14, [sp, #-80]! // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_i64
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.d
+; CHECK-NEXT:    fmov d0, x0
+; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1d { z0.d }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp], #80 // 16-byte Folded Reload
+; CHECK-NEXT:    ret
+  %res = call i64 @get_i64()
+  %vec = insertelement <vscale x 2 x i64> poison, i64 %res, i32 0
+  store <vscale x 2 x i64> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_res_f16(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_f16:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sub sp, sp, #96
+; CHECK-NEXT:    stp d15, d14, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_f16
+; CHECK-NEXT:    str h0, [sp, #14] // 2-byte Folded Spill
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.h
+; CHECK-NEXT:    ldr h0, [sp, #14] // 2-byte Folded Reload
+; CHECK-NEXT:    // kill: def $h0 killed $h0 def $z0
+; CHECK-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1h { z0.h }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    add sp, sp, #96
+; CHECK-NEXT:    ret
+  %res = call half @get_f16()
+  %vec = insertelement <vscale x 8 x half> poison, half %res, i32 0
+  store <vscale x 8 x half> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_res_f32(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_f32:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sub sp, sp, #96
+; CHECK-NEXT:    stp d15, d14, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_f32
+; CHECK-NEXT:    str s0, [sp, #12] // 4-byte Folded Spill
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.s
+; CHECK-NEXT:    ldr s0, [sp, #12] // 4-byte Folded Reload
+; CHECK-NEXT:    // kill: def $s0 killed $s0 def $z0
+; CHECK-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1w { z0.s }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    add sp, sp, #96
+; CHECK-NEXT:    ret
+  %res = call float @get_f32()
+  %vec = insertelement <vscale x 4 x float> poison, float %res, i32 0
+  store <vscale x 4 x float> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_res_f64(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_f64:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sub sp, sp, #96
+; CHECK-NEXT:    stp d15, d14, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_f64
+; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.d
+; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
+; CHECK-NEXT:    // kill: def $d0 killed $d0 def $z0
+; CHECK-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1d { z0.d }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    add sp, sp, #96
+; CHECK-NEXT:    ret
+  %res = call double @get_f64()
+  %vec = insertelement <vscale x 2 x double> poison, double %res, i32 0
+  store <vscale x 2 x double> %vec, ptr %ptr
+  ret void
+}
+
+;
+; Single-element vector result values
+;
+
+define void @dont_coalesce_res_v1i8(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_v1i8:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sub sp, sp, #96
+; CHECK-NEXT:    stp d15, d14, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_v1i8
+; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.b
+; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
+; CHECK-NEXT:    // kill: def $d0 killed $d0 def $z0
+; CHECK-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1b { z0.b }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    add sp, sp, #96
+; CHECK-NEXT:    ret
+  %res = call <1 x i8> @get_v1i8()
+  %elt = extractelement <1 x i8> %res, i32 0
+  %vec = insertelement <vscale x 16 x i8> poison, i8 %elt, i32 0
+  store <vscale x 16 x i8> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_res_v1i16(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_v1i16:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sub sp, sp, #96
+; CHECK-NEXT:    stp d15, d14, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_v1i16
+; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.h
+; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
+; CHECK-NEXT:    // kill: def $d0 killed $d0 def $z0
+; CHECK-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1h { z0.h }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    add sp, sp, #96
+; CHECK-NEXT:    ret
+  %res = call <1 x i16> @get_v1i16()
+  %elt = extractelement <1 x i16> %res, i32 0
+  %vec = insertelement <vscale x 8 x i16> poison, i16 %elt, i32 0
+  store <vscale x 8 x i16> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_res_v1i32(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_v1i32:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sub sp, sp, #96
+; CHECK-NEXT:    stp d15, d14, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_v1i32
+; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.s
+; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
+; CHECK-NEXT:    // kill: def $d0 killed $d0 def $z0
+; CHECK-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1w { z0.s }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    add sp, sp, #96
+; CHECK-NEXT:    ret
+  %res = call <1 x i32> @get_v1i32()
+  %elt = extractelement <1 x i32> %res, i32 0
+  %vec = insertelement <vscale x 4 x i32> poison, i32 %elt, i32 0
+  store <vscale x 4 x i32> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_res_v1i64(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_v1i64:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sub sp, sp, #96
+; CHECK-NEXT:    stp d15, d14, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_v1i64
+; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.d
+; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
+; CHECK-NEXT:    // kill: def $d0 killed $d0 def $z0
+; CHECK-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1d { z0.d }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    add sp, sp, #96
+; CHECK-NEXT:    ret
+  %res = call <1 x i64> @get_v1i64()
+  %elt = extractelement <1 x i64> %res, i32 0
+  %vec = insertelement <vscale x 2 x i64> poison, i64 %elt, i32 0
+  store <vscale x 2 x i64> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_res_v1f16(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_v1f16:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sub sp, sp, #96
+; CHECK-NEXT:    stp d15, d14, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_v1f16
+; CHECK-NEXT:    str h0, [sp, #14] // 2-byte Folded Spill
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.h
+; CHECK-NEXT:    ldr h0, [sp, #14] // 2-byte Folded Reload
+; CHECK-NEXT:    // kill: def $h0 killed $h0 def $z0
+; CHECK-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1h { z0.h }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    add sp, sp, #96
+; CHECK-NEXT:    ret
+  %res = call <1 x half> @get_v1f16()
+  %elt = extractelement <1 x half> %res, i32 0
+  %vec = insertelement <vscale x 8 x half> poison, half %elt, i32 0
+  store <vscale x 8 x half> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_res_v1f32(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_v1f32:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sub sp, sp, #96
+; CHECK-NEXT:    stp d15, d14, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_v1f32
+; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.s
+; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
+; CHECK-NEXT:    // kill: def $d0 killed $d0 def $z0
+; CHECK-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1w { z0.s }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    add sp, sp, #96
+; CHECK-NEXT:    ret
+  %res = call <1 x float> @get_v1f32()
+  %elt = extractelement <1 x float> %res, i32 0
+  %vec = insertelement <vscale x 4 x float> poison, float %elt, i32 0
+  store <vscale x 4 x float> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_res_v1f64(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_v1f64:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sub sp, sp, #96
+; CHECK-NEXT:    stp d15, d14, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_v1f64
+; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.d
+; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
+; CHECK-NEXT:    // kill: def $d0 killed $d0 def $z0
+; CHECK-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1d { z0.d }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    add sp, sp, #96
+; CHECK-NEXT:    ret
+  %res = call <1 x double> @get_v1f64()
+  %elt = extractelement <1 x double> %res, i32 0
+  %vec = insertelement <vscale x 2 x double> poison, double %elt, i32 0
+  store <vscale x 2 x double> %vec, ptr %ptr
+  ret void
+}
+
+;
+; Full vector result values
+;
+
+define void @dont_coalesce_res_v16i8(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_v16i8:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sub sp, sp, #96
+; CHECK-NEXT:    stp d15, d14, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_v16i8
+; CHECK-NEXT:    str q0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.b
+; CHECK-NEXT:    ldr q0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    // kill: def $q0 killed $q0 def $z0
+; CHECK-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1b { z0.b }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    add sp, sp, #96
+; CHECK-NEXT:    ret
+  %res = call <16 x i8> @get_v16i8()
+  %vec = call <vscale x 16 x i8> @llvm.vector.insert.nxv16i8.v16i8(<vscale x 16 x i8> poison, <16 x i8> %res, i64 0)
+  store <vscale x 16 x i8> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_res_v8i16(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_v8i16:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sub sp, sp, #96
+; CHECK-NEXT:    stp d15, d14, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_v8i16
+; CHECK-NEXT:    str q0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.h
+; CHECK-NEXT:    ldr q0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    // kill: def $q0 killed $q0 def $z0
+; CHECK-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1h { z0.h }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    add sp, sp, #96
+; CHECK-NEXT:    ret
+  %res = call <8 x i16> @get_v8i16()
+  %vec = call <vscale x 8 x i16> @llvm.vector.insert.nxv8i16.v8i16(<vscale x 8 x i16> poison, <8 x i16> %res, i64 0)
+  store <vscale x 8 x i16> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_res_v4i32(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_v4i32:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sub sp, sp, #96
+; CHECK-NEXT:    stp d15, d14, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_v4i32
+; CHECK-NEXT:    str q0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.s
+; CHECK-NEXT:    ldr q0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    // kill: def $q0 killed $q0 def $z0
+; CHECK-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1w { z0.s }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    add sp, sp, #96
+; CHECK-NEXT:    ret
+  %res = call <4 x i32> @get_v4i32()
+  %vec = call <vscale x 4 x i32> @llvm.vector.insert.nxv4i32.v4i32(<vscale x 4 x i32> poison, <4 x i32> %res, i64 0)
+  store <vscale x 4 x i32> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_res_v2i64(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_v2i64:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sub sp, sp, #96
+; CHECK-NEXT:    stp d15, d14, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_v2i64
+; CHECK-NEXT:    str q0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.d
+; CHECK-NEXT:    ldr q0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    // kill: def $q0 killed $q0 def $z0
+; CHECK-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1d { z0.d }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    add sp, sp, #96
+; CHECK-NEXT:    ret
+  %res = call <2 x i64> @get_v2i64()
+  %vec = call <vscale x 2 x i64> @llvm.vector.insert.nxv2i64.v2i64(<vscale x 2 x i64> poison, <2 x i64> %res, i64 0)
+  store <vscale x 2 x i64> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_res_v8f16(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_v8f16:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sub sp, sp, #96
+; CHECK-NEXT:    stp d15, d14, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_v8f16
+; CHECK-NEXT:    str q0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.h
+; CHECK-NEXT:    ldr q0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    // kill: def $q0 killed $q0 def $z0
+; CHECK-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1h { z0.h }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    add sp, sp, #96
+; CHECK-NEXT:    ret
+  %res = call <8 x half> @get_v8f16()
+  %vec = call <vscale x 8 x half> @llvm.vector.insert.nxv8f16.v8f16(<vscale x 8 x half> poison, <8 x half> %res, i64 0)
+  store <vscale x 8 x half> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_res_v4f32(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_v4f32:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sub sp, sp, #96
+; CHECK-NEXT:    stp d15, d14, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_v4f32
+; CHECK-NEXT:    str q0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.s
+; CHECK-NEXT:    ldr q0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    // kill: def $q0 killed $q0 def $z0
+; CHECK-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1w { z0.s }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    add sp, sp, #96
+; CHECK-NEXT:    ret
+  %res = call <4 x float> @get_v4f32()
+  %vec = call <vscale x 4 x float> @llvm.vector.insert.nxv4f32.v4f32(<vscale x 4 x float> poison, <4 x float> %res, i64 0)
+  store <vscale x 4 x float> %vec, ptr %ptr
+  ret void
+}
+
+define void @dont_coalesce_res_v2f64(ptr %ptr) #0 {
+; CHECK-LABEL: dont_coalesce_res_v2f64:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sub sp, sp, #96
+; CHECK-NEXT:    stp d15, d14, [sp, #16] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d13, d12, [sp, #32] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d11, d10, [sp, #48] // 16-byte Folded Spill
+; CHECK-NEXT:    stp d9, d8, [sp, #64] // 16-byte Folded Spill
+; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
+; CHECK-NEXT:    mov x19, x0
+; CHECK-NEXT:    smstop sm
+; CHECK-NEXT:    bl get_v2f64
+; CHECK-NEXT:    str q0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ptrue p0.d
+; CHECK-NEXT:    ldr q0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    // kill: def $q0 killed $q0 def $z0
+; CHECK-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d11, d10, [sp, #48] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d13, d12, [sp, #32] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp d15, d14, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    st1d { z0.d }, p0, [x19]
+; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
+; CHECK-NEXT:    add sp, sp, #96
+; CHECK-NEXT:    ret
+  %res = call <2 x double> @get_v2f64()
+  %vec = call <vscale x 2 x double> @llvm.vector.insert.nxv2f64.v2f64(<vscale x 2 x double> poison, <2 x double> %res, i64 0)
+  store <vscale x 2 x double> %vec, ptr %ptr
+  ret void
+}
+
+declare half @get_f16()
+declare float @get_f32()
+declare double @get_f64()
+declare <1 x half> @get_v1f16()
+declare <1 x float> @get_v1f32()
+declare <1 x double> @get_v1f64()
+declare <8 x half> @get_v8f16()
+declare <4 x float> @get_v4f32()
+declare <2 x double> @get_v2f64()
+
+declare i8 @get_i8()
+declare i16 @get_i16()
+declare i32 @get_i32()
+declare i64 @get_i64()
+declare <1 x i8> @get_v1i8()
+declare <1 x i16> @get_v1i16()
+declare <1 x i32> @get_v1i32()
+declare <2 x i64> @get_v1i64()
+declare <16 x i8> @get_v16i8()
+declare <8 x i16> @get_v8i16()
+declare <4 x i32> @get_v4i32()
+declare <2 x i64> @get_v2i64()
+
+declare void @use_f16(half)
+declare void @use_f32(float)
+declare void @use_f64(double)
+declare void @use_v1f16(<1 x half>)
+declare void @use_v1f32(<1 x float>)
+declare void @use_v1f64(<1 x double>)
+declare void @use_v8f16(<8 x half>)
+declare void @use_v8bf16(<8 x bfloat>)
+declare void @use_v4f32(<4 x float>)
+declare void @use_v2f64(<2 x double>)
+
+declare void @use_i8(i8)
+declare void @use_i16(i16)
+declare void @use_i32(i32)
+declare void @use_i64(i64)
+declare void @use_v1i8(<1 x i8>)
+declare void @use_v1i16(<1 x i16>)
+declare void @use_v1i32(<1 x i32>)
+declare void @use_v1i64(<1 x i64>)
+declare void @use_v16i8(<16 x i8>)
+declare void @use_v8i16(<8 x i16>)
+declare void @use_v4i32(<4 x i32>)
+declare void @use_v2i64(<2 x i64>)
+declare void @use_v8i1(<8 x i1>)
+
+declare <vscale x 16 x i1> @llvm.vector.insert.nxv8i1.v8i1(<vscale x 16 x i1>, <8 x i1>, i64)
+declare <vscale x 16 x i8> @llvm.vector.insert.nxv16i8.v16i8(<vscale x 16 x i8>, <16 x i8>, i64)
+declare <vscale x 8 x i16> @llvm.vector.insert.nxv8i16.v8i16(<vscale x 8 x i16>, <8 x i16>, i64)
+declare <vscale x 4 x i32> @llvm.vector.insert.nxv4i32.v4i32(<vscale x 4 x i32>, <4 x i32>, i64)
+declare <vscale x 2 x i64> @llvm.vector.insert.nxv2i64.v2i64(<vscale x 2 x i64>, <2 x i64>, i64)
+declare <vscale x 8 x half> @llvm.vector.insert.nxv8f16.v8f16(<vscale x 8 x half>, <8 x half>, i64)
+declare <vscale x 4 x float> @llvm.vector.insert.nxv4f32.v4f32(<vscale x 4 x float>, <4 x float>, i64)
+declare <vscale x 2 x double> @llvm.vector.insert.nxv2f64.v2f64(<vscale x 2 x double>, <2 x double>, i64)
+
+attributes #0 = { nounwind "aarch64_pstate_sm_enabled" "target-features"="+sve,+sme"  }
diff --git a/llvm/test/CodeGen/AArch64/sme-streaming-body.ll b/llvm/test/CodeGen/AArch64/sme-streaming-body.ll
index 55dc28f49bf157..93875549cffc86 100644
--- a/llvm/test/CodeGen/AArch64/sme-streaming-body.ll
+++ b/llvm/test/CodeGen/AArch64/sme-streaming-body.ll
@@ -249,11 +249,15 @@ define double @call_to_intrinsic_without_chain(double %x) nounwind "aarch64_psta
 ; CHECK-NEXT:    str x30, [sp, #80] // 8-byte Folded Spill
 ; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
 ; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
+; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
 ; CHECK-NEXT:    smstop sm
 ; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
 ; CHECK-NEXT:    bl cos
 ; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
 ; CHECK-NEXT:    smstart sm
+; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
+; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
 ; CHECK-NEXT:    smstop sm
 ; CHECK-NEXT:    ldp d9, d8, [sp, #64] // 16-byte Folded Reload
 ; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
diff --git a/llvm/test/CodeGen/AArch64/sme-streaming-compatible-interface.ll b/llvm/test/CodeGen/AArch64/sme-streaming-compatible-interface.ll
index 5d0c9127d3ebb2..296f2be9cfee5e 100644
--- a/llvm/test/CodeGen/AArch64/sme-streaming-compatible-interface.ll
+++ b/llvm/test/CodeGen/AArch64/sme-streaming-compatible-interface.ll
@@ -129,30 +129,37 @@ define <2 x double> @streaming_compatible_with_neon_vectors(<2 x double> %arg) "
 ; CHECK-NEXT:    stp d9, d8, [sp, #48] // 16-byte Folded Spill
 ; CHECK-NEXT:    str x29, [sp, #64] // 8-byte Folded Spill
 ; CHECK-NEXT:    stp x30, x19, [sp, #80] // 16-byte Folded Spill
-; CHECK-NEXT:    addvl sp, sp, #-2
+; CHECK-NEXT:    sub sp, sp, #16
+; CHECK-NEXT:    addvl sp, sp, #-1
+; CHECK-NEXT:    add x8, sp, #16
 ; CHECK-NEXT:    // kill: def $q0 killed $q0 def $z0
-; CHECK-NEXT:    str z0, [sp, #1, mul vl] // 16-byte Folded Spill
+; CHECK-NEXT:    str z0, [x8] // 16-byte Folded Spill
 ; CHECK-NEXT:    bl __arm_sme_state
+; CHECK-NEXT:    add x8, sp, #16
 ; CHECK-NEXT:    and x19, x0, #0x1
+; CHECK-NEXT:    ldr z0, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    // kill: def $q0 killed $q0 killed $z0
+; CHECK-NEXT:    str q0, [sp] // 16-byte Folded Spill
 ; CHECK-NEXT:    tbz w19, #0, .LBB4_2
 ; CHECK-NEXT:  // %bb.1:
 ; CHECK-NEXT:    smstop sm
 ; CHECK-NEXT:  .LBB4_2:
-; CHECK-NEXT:    ldr z0, [sp, #1, mul vl] // 16-byte Folded Reload
-; CHECK-NEXT:    // kill: def $q0 killed $q0 killed $z0
+; CHECK-NEXT:    ldr q0, [sp] // 16-byte Folded Reload
 ; CHECK-NEXT:    bl normal_callee_vec_arg
-; CHECK-NEXT:    // kill: def $q0 killed $q0 def $z0
-; CHECK-NEXT:    str z0, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    str q0, [sp] // 16-byte Folded Spill
 ; CHECK-NEXT:    tbz w19, #0, .LBB4_4
 ; CHECK-NEXT:  // %bb.3:
 ; CHECK-NEXT:    smstart sm
 ; CHECK-NEXT:  .LBB4_4:
 ; CHECK-NEXT:    ptrue p0.d, vl2
-; CHECK-NEXT:    ldr z0, [sp, #1, mul vl] // 16-byte Folded Reload
-; CHECK-NEXT:    ldr z1, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    add x8, sp, #16
+; CHECK-NEXT:    ldr q0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr z1, [x8] // 16-byte Folded Reload
+; CHECK-NEXT:    // kill: def $q0 killed $q0 def $z0
 ; CHECK-NEXT:    fadd z0.d, p0/m, z0.d, z1.d
 ; CHECK-NEXT:    // kill: def $q0 killed $q0 killed $z0
-; CHECK-NEXT:    addvl sp, sp, #2
+; CHECK-NEXT:    addvl sp, sp, #1
+; CHECK-NEXT:    add sp, sp, #16
 ; CHECK-NEXT:    ldp x30, x19, [sp, #80] // 16-byte Folded Reload
 ; CHECK-NEXT:    ldr x29, [sp, #64] // 8-byte Folded Reload
 ; CHECK-NEXT:    ldp d9, d8, [sp, #48] // 16-byte Folded Reload
@@ -462,7 +469,11 @@ define void @call_to_non_streaming_pass_args(ptr nocapture noundef readnone %ptr
 ; CHECK-NEXT:    mov x9, x0
 ; CHECK-NEXT:    stp s0, s1, [sp, #8] // 8-byte Folded Spill
 ; CHECK-NEXT:    bl __arm_sme_state
+; CHECK-NEXT:    ldp s4, s0, [sp, #8] // 8-byte Folded Reload
 ; CHECK-NEXT:    and x19, x0, #0x1
+; CHECK-NEXT:    stp s4, s0, [sp, #8] // 8-byte Folded Spill
+; CHECK-NEXT:    ldp d4, d0, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    stp d4, d0, [sp, #16] // 16-byte Folded Spill
 ; CHECK-NEXT:    tbz w19, #0, .LBB10_2
 ; CHECK-NEXT:  // %bb.1: // %entry
 ; CHECK-NEXT:    smstop sm
diff --git a/llvm/test/CodeGen/AArch64/sme-streaming-interface.ll b/llvm/test/CodeGen/AArch64/sme-streaming-interface.ll
index dd7d6470ad7b08..86918a59f3810e 100644
--- a/llvm/test/CodeGen/AArch64/sme-streaming-interface.ll
+++ b/llvm/test/CodeGen/AArch64/sme-streaming-interface.ll
@@ -313,9 +313,9 @@ define double @call_to_intrinsic_without_chain(double %x) nounwind "aarch64_psta
 ; CHECK-NEXT:    stp d11, d10, [sp, #48] // 16-byte Folded Spill
 ; CHECK-NEXT:    stp d9, d8, [sp, #64] // 16-byte Folded Spill
 ; CHECK-NEXT:    str x30, [sp, #80] // 8-byte Folded Spill
-; CHECK-NEXT:    str d0, [sp, #8] // 8-byte Folded Spill
+; CHECK-NEXT:    stp d0, d0, [sp] // 16-byte Folded Spill
 ; CHECK-NEXT:    smstop sm
-; CHECK-NEXT:    ldr d0, [sp, #8] // 8-byte Folded Reload
+; CHECK-NEXT:    ldr d0, [sp] // 8-byte Folded Reload
 ; CHECK-NEXT:    bl cos
 ; CHECK-NEXT:    str d0, [sp] // 8-byte Folded Spill
 ; CHECK-NEXT:    smstart sm
@@ -405,11 +405,11 @@ define void @call_to_non_streaming_pass_args(ptr nocapture noundef readnone %ptr
 ; CHECK-NEXT:    stp d11, d10, [sp, #64] // 16-byte Folded Spill
 ; CHECK-NEXT:    stp d9, d8, [sp, #80] // 16-byte Folded Spill
 ; CHECK-NEXT:    str x30, [sp, #96] // 8-byte Folded Spill
-; CHECK-NEXT:    stp d2, d3, [sp, #16] // 16-byte Folded Spill
-; CHECK-NEXT:    stp s0, s1, [sp, #8] // 8-byte Folded Spill
+; CHECK-NEXT:    stp s1, s0, [sp, #24] // 8-byte Folded Spill
+; CHECK-NEXT:    stp d3, d2, [sp, #8] // 16-byte Folded Spill
 ; CHECK-NEXT:    smstop sm
-; CHECK-NEXT:    ldp s0, s1, [sp, #8] // 8-byte Folded Reload
-; CHECK-NEXT:    ldp d2, d3, [sp, #16] // 16-byte Folded Reload
+; CHECK-NEXT:    ldp s1, s0, [sp, #24] // 8-byte Folded Reload
+; CHECK-NEXT:    ldp d3, d2, [sp, #8] // 16-byte Folded Reload
 ; CHECK-NEXT:    bl bar
 ; CHECK-NEXT:    smstart sm
 ; CHECK-NEXT:    ldp d9, d8, [sp, #80] // 16-byte Folded Reload
diff --git a/llvm/test/CodeGen/AArch64/sme-streaming-mode-changing-call-disable-stackslot-scavenging.ll b/llvm/test/CodeGen/AArch64/sme-streaming-mode-changing-call-disable-stackslot-scavenging.ll
index 45ca7844b06551..cf171f8ef5ed3a 100644
--- a/llvm/test/CodeGen/AArch64/sme-streaming-mode-changing-call-disable-stackslot-scavenging.ll
+++ b/llvm/test/CodeGen/AArch64/sme-streaming-mode-changing-call-disable-stackslot-scavenging.ll
@@ -22,9 +22,9 @@ define void @test_no_stackslot_scavenging(float %f) #0 {
 ; CHECK-NEXT:    stp x30, x24, [sp, #80] // 16-byte Folded Spill
 ; CHECK-NEXT:    sub sp, sp, #16
 ; CHECK-NEXT:    addvl sp, sp, #-1
-; CHECK-NEXT:    str s0, [sp, #12] // 4-byte Folded Spill
 ; CHECK-NEXT:    //APP
 ; CHECK-NEXT:    //NO_APP
+; CHECK-NEXT:    str s0, [sp, #12] // 4-byte Folded Spill
 ; CHECK-NEXT:    smstop sm
 ; CHECK-NEXT:    ldr s0, [sp, #12] // 4-byte Folded Reload
 ; CHECK-NEXT:    bl use_f