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[SVE] Fix incorrect offset calculation when rewriting an instruction's frame index. #70315

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merged 2 commits into from
Oct 27, 2023
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[SVE] Fix incorrect offset calculation when rewriting an instruction's frame index. #70315

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cc819b2
[SVE] Add reproducer for stack corruption bug.
paulwalker-arm Oct 26, 2023
8b58ad2
[SVE] Fix incorrect offset calculation when rewriting an instruction'…
paulwalker-arm Oct 26, 2023
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2 changes: 1 addition & 1 deletion llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5657,7 +5657,7 @@ int llvm::isAArch64FrameOffsetLegal(const MachineInstr &MI,
Offset = Remainder;
else {
NewOffset = NewOffset < 0 ? MinOff : MaxOff;
Offset = Offset - NewOffset * Scale + Remainder;
Offset = Offset - NewOffset * Scale;
}

if (EmittableOffset)
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22 changes: 22 additions & 0 deletions llvm/test/CodeGen/AArch64/framelayout-sve.mir
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Expand Up @@ -41,6 +41,7 @@
define aarch64_sve_vector_pcs void @save_restore_sve_realign() uwtable { entry: unreachable }
define aarch64_sve_vector_pcs void @frame_layout() uwtable { entry: unreachable }
define void @fp_relative_index_with_float_save() uwtable { entry: unreachable }
define void @fp_relative_that_is_not_a_multiple_of_VLx16() uwtable { entry: unreachable }

...
# +----------+
Expand Down Expand Up @@ -1287,3 +1288,24 @@ body: |

RET_ReallyLR
---
...
# CHECK-LABEL: name: fp_relative_that_is_not_a_multiple_of_VLx16
# CHECK: - { id: 0, name: '', type: default, offset: -156, size: 156, alignment: 1,
# CHECK-NEXT: stack-id: scalable-vector
# CHECK: - { id: 1, name: '', type: variable-sized, offset: -32, alignment: 1,
# CHECK-NEXT: stack-id: default

# CHECK: $x8 = ADDPL_XXI $fp, -14
# CHECK-NEXT: $z0 = LD1W_IMM killed renamable $p0, killed $x8, -8

name: fp_relative_that_is_not_a_multiple_of_VLx16
stack:
- { id: 0, stack-id: scalable-vector, size: 156, alignment: 1 }
- { id: 1, stack-id: default, type: variable-sized, alignment: 1 }
body: |
bb.0.entry:
liveins: $p0

renamable $z0 = LD1W_IMM killed renamable $p0, %stack.0, 0
RET_ReallyLR
---
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