diff --git a/compiler/rustc_codegen_llvm/src/abi.rs b/compiler/rustc_codegen_llvm/src/abi.rs
index e9b66b54c58b3..8a11e3e71bc81 100644
--- a/compiler/rustc_codegen_llvm/src/abi.rs
+++ b/compiler/rustc_codegen_llvm/src/abi.rs
@@ -37,7 +37,7 @@ impl ArgAttributeExt for ArgAttribute {
     where
         F: FnMut(llvm::Attribute),
     {
-        for_each_kind!(self, f, NoAlias, NoCapture, NonNull, ReadOnly, InReg)
+        for_each_kind!(self, f, NoAlias, NoCapture, NonNull, ReadOnly, InReg, NoUndef)
     }
 }
 
diff --git a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
index 367c86a1dc942..4f62c68556841 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
@@ -189,6 +189,7 @@ pub enum Attribute {
     StackProtectReq = 30,
     StackProtectStrong = 31,
     StackProtect = 32,
+    NoUndef = 33,
 }
 
 /// LLVMIntPredicate
diff --git a/compiler/rustc_llvm/llvm-wrapper/LLVMWrapper.h b/compiler/rustc_llvm/llvm-wrapper/LLVMWrapper.h
index e2ce7da0e84af..9e0a9b354e196 100644
--- a/compiler/rustc_llvm/llvm-wrapper/LLVMWrapper.h
+++ b/compiler/rustc_llvm/llvm-wrapper/LLVMWrapper.h
@@ -82,6 +82,7 @@ enum LLVMRustAttribute {
   StackProtectReq = 30,
   StackProtectStrong = 31,
   StackProtect = 32,
+  NoUndef = 33,
 };
 
 typedef struct OpaqueRustString *RustStringRef;
diff --git a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
index d871290744f8b..fb9c5e6a527a7 100644
--- a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
@@ -224,6 +224,8 @@ static Attribute::AttrKind fromRust(LLVMRustAttribute Kind) {
     return Attribute::StackProtectStrong;
   case StackProtect:
     return Attribute::StackProtect;
+  case NoUndef:
+    return Attribute::NoUndef;
   }
   report_fatal_error("bad AttributeKind");
 }
diff --git a/compiler/rustc_middle/src/ty/layout.rs b/compiler/rustc_middle/src/ty/layout.rs
index ad817e185a3cf..d2d22fbf31c13 100644
--- a/compiler/rustc_middle/src/ty/layout.rs
+++ b/compiler/rustc_middle/src/ty/layout.rs
@@ -3048,9 +3048,10 @@ impl<'tcx> LayoutCx<'tcx, TyCtxt<'tcx>> {
                                       layout: TyAndLayout<'tcx>,
                                       offset: Size,
                                       is_return: bool| {
-            // Booleans are always an i1 that needs to be zero-extended.
+            // Booleans are always a noundef i1 that needs to be zero-extended.
             if scalar.is_bool() {
                 attrs.ext(ArgExtension::Zext);
+                attrs.set(ArgAttribute::NoUndef);
                 return;
             }
 
@@ -3075,6 +3076,11 @@ impl<'tcx> LayoutCx<'tcx, TyCtxt<'tcx>> {
                         _ => pointee.size,
                     };
 
+                    // `Box`, `&T`, and `&mut T` cannot be undef.
+                    // Note that this only applies to the value of the pointer itself;
+                    // this attribute doesn't make it UB for the pointed-to data to be undef.
+                    attrs.set(ArgAttribute::NoUndef);
+
                     // `Box` pointer parameters never alias because ownership is transferred
                     // `&mut` pointer parameters never alias other parameters,
                     // or mutable global data
diff --git a/compiler/rustc_target/src/abi/call/mod.rs b/compiler/rustc_target/src/abi/call/mod.rs
index 735b7e76e3862..b605f21d0518d 100644
--- a/compiler/rustc_target/src/abi/call/mod.rs
+++ b/compiler/rustc_target/src/abi/call/mod.rs
@@ -73,6 +73,7 @@ mod attr_impl {
             // or not to actually emit the attribute. It can also be controlled
             // with the `-Zmutable-noalias` debugging option.
             const NoAliasMutRef = 1 << 6;
+            const NoUndef = 1 << 7;
         }
     }
 }
@@ -494,7 +495,11 @@ impl<'a, Ty> ArgAbi<'a, Ty> {
         // For non-immediate arguments the callee gets its own copy of
         // the value on the stack, so there are no aliases. It's also
         // program-invisible so can't possibly capture
-        attrs.set(ArgAttribute::NoAlias).set(ArgAttribute::NoCapture).set(ArgAttribute::NonNull);
+        attrs
+            .set(ArgAttribute::NoAlias)
+            .set(ArgAttribute::NoCapture)
+            .set(ArgAttribute::NonNull)
+            .set(ArgAttribute::NoUndef);
         attrs.pointee_size = layout.size;
         // FIXME(eddyb) We should be doing this, but at least on
         // i686-pc-windows-msvc, it results in wrong stack offsets.
diff --git a/src/test/codegen/fastcall-inreg.rs b/src/test/codegen/fastcall-inreg.rs
index adbeae454494a..ec7a679159286 100644
--- a/src/test/codegen/fastcall-inreg.rs
+++ b/src/test/codegen/fastcall-inreg.rs
@@ -2,52 +2,17 @@
 // as "inreg" like the C/C++ compilers for the platforms.
 // x86 only.
 
-// ignore-aarch64
-// ignore-aarch64_be
-// ignore-arm
-// ignore-armeb
-// ignore-avr
-// ignore-bpfel
-// ignore-bpfeb
-// ignore-hexagon
-// ignore-mips
-// ignore-mips64
-// ignore-msp430
-// ignore-powerpc64
-// ignore-powerpc64le
-// ignore-powerpc
-// ignore-r600
-// ignore-riscv64
-// ignore-amdgcn
-// ignore-sparc
-// ignore-sparc64
-// ignore-sparcv9
-// ignore-sparcel
-// ignore-s390x
-// ignore-tce
-// ignore-thumb
-// ignore-thumbeb
-// ignore-x86_64
-// ignore-xcore
-// ignore-nvptx
-// ignore-nvptx64
-// ignore-le32
-// ignore-le64
-// ignore-amdil
-// ignore-amdil64
-// ignore-hsail
-// ignore-hsail64
-// ignore-spir
-// ignore-spir64
-// ignore-kalimba
-// ignore-shave
-// ignore-wasm32
-// ignore-wasm64
-// ignore-emscripten
-
-// compile-flags: -C no-prepopulate-passes
+// compile-flags: --target i686-unknown-linux-gnu -C no-prepopulate-passes
+// needs-llvm-components: x86
 
 #![crate_type = "lib"]
+#![no_core]
+#![feature(no_core, lang_items)]
+
+#[lang = "sized"]
+trait Sized {}
+#[lang = "copy"]
+trait Copy {}
 
 pub mod tests {
     // CHECK: @f1(i32 inreg %_1, i32 inreg %_2, i32 %_3)
@@ -70,7 +35,7 @@ pub mod tests {
     #[no_mangle]
     pub extern "fastcall" fn f5(_: i64, _: i32) {}
 
-    // CHECK: @f6(i1 inreg zeroext %_1, i32 inreg %_2, i32 %_3)
+    // CHECK: @f6(i1 inreg noundef zeroext %_1, i32 inreg %_2, i32 %_3)
     #[no_mangle]
     pub extern "fastcall" fn f6(_: bool, _: i32, _: i32) {}
 }
diff --git a/src/test/codegen/function-arguments.rs b/src/test/codegen/function-arguments.rs
index 3e10e227e55fe..17b54d86cb09f 100644
--- a/src/test/codegen/function-arguments.rs
+++ b/src/test/codegen/function-arguments.rs
@@ -3,6 +3,8 @@
 #![crate_type = "lib"]
 #![feature(rustc_attrs)]
 
+use std::mem::MaybeUninit;
+
 pub struct S {
   _field: [i32; 8],
 }
@@ -11,68 +13,79 @@ pub struct UnsafeInner {
   _field: std::cell::UnsafeCell<i16>,
 }
 
-// CHECK: zeroext i1 @boolean(i1 zeroext %x)
+// CHECK: noundef zeroext i1 @boolean(i1 noundef zeroext %x)
 #[no_mangle]
 pub fn boolean(x: bool) -> bool {
   x
 }
 
-// CHECK: @readonly_borrow(i32* noalias readonly align 4 dereferenceable(4) %_1)
+// CHECK: i8 @maybeuninit_boolean(i8 %x)
+#[no_mangle]
+pub fn maybeuninit_boolean(x: MaybeUninit<bool>) -> MaybeUninit<bool> {
+  x
+}
+
+// CHECK: @readonly_borrow(i32* noalias noundef readonly align 4 dereferenceable(4) %_1)
 // FIXME #25759 This should also have `nocapture`
 #[no_mangle]
 pub fn readonly_borrow(_: &i32) {
 }
 
-// CHECK: @static_borrow(i32* noalias readonly align 4 dereferenceable(4) %_1)
+// CHECK: @static_borrow(i32* noalias noundef readonly align 4 dereferenceable(4) %_1)
 // static borrow may be captured
 #[no_mangle]
 pub fn static_borrow(_: &'static i32) {
 }
 
-// CHECK: @named_borrow(i32* noalias readonly align 4 dereferenceable(4) %_1)
+// CHECK: @named_borrow(i32* noalias noundef readonly align 4 dereferenceable(4) %_1)
 // borrow with named lifetime may be captured
 #[no_mangle]
 pub fn named_borrow<'r>(_: &'r i32) {
 }
 
-// CHECK: @unsafe_borrow(i16* align 2 dereferenceable(2) %_1)
+// CHECK: @unsafe_borrow(i16* noundef align 2 dereferenceable(2) %_1)
 // unsafe interior means this isn't actually readonly and there may be aliases ...
 #[no_mangle]
 pub fn unsafe_borrow(_: &UnsafeInner) {
 }
 
-// CHECK: @mutable_unsafe_borrow(i16* noalias align 2 dereferenceable(2) %_1)
+// CHECK: @mutable_unsafe_borrow(i16* noalias noundef align 2 dereferenceable(2) %_1)
 // ... unless this is a mutable borrow, those never alias
 #[no_mangle]
 pub fn mutable_unsafe_borrow(_: &mut UnsafeInner) {
 }
 
-// CHECK: @mutable_borrow(i32* noalias align 4 dereferenceable(4) %_1)
+// CHECK: @mutable_borrow(i32* noalias noundef align 4 dereferenceable(4) %_1)
 // FIXME #25759 This should also have `nocapture`
 #[no_mangle]
 pub fn mutable_borrow(_: &mut i32) {
 }
 
-// CHECK: @indirect_struct(%S* noalias nocapture dereferenceable(32) %_1)
+// CHECK: @indirect_struct(%S* noalias nocapture noundef dereferenceable(32) %_1)
 #[no_mangle]
 pub fn indirect_struct(_: S) {
 }
 
-// CHECK: @borrowed_struct(%S* noalias readonly align 4 dereferenceable(32) %_1)
+// CHECK: @borrowed_struct(%S* noalias noundef readonly align 4 dereferenceable(32) %_1)
 // FIXME #25759 This should also have `nocapture`
 #[no_mangle]
 pub fn borrowed_struct(_: &S) {
 }
 
+// CHECK: @raw_struct(%S* %_1)
+#[no_mangle]
+pub fn raw_struct(_: *const S) {
+}
+
 // `Box` can get deallocated during execution of the function, so it should
 // not get `dereferenceable`.
-// CHECK: noalias nonnull align 4 i32* @_box(i32* noalias nonnull align 4 %x)
+// CHECK: noalias noundef nonnull align 4 i32* @_box(i32* noalias noundef nonnull align 4 %x)
 #[no_mangle]
 pub fn _box(x: Box<i32>) -> Box<i32> {
   x
 }
 
-// CHECK: @struct_return(%S* noalias nocapture sret(%S) dereferenceable(32){{( %0)?}})
+// CHECK: @struct_return(%S* noalias nocapture noundef sret(%S) dereferenceable(32){{( %0)?}})
 #[no_mangle]
 pub fn struct_return() -> S {
   S {
@@ -86,48 +99,58 @@ pub fn struct_return() -> S {
 pub fn helper(_: usize) {
 }
 
-// CHECK: @slice([0 x i8]* noalias nonnull readonly align 1 %_1.0, [[USIZE]] %_1.1)
+// CHECK: @slice([0 x i8]* noalias noundef nonnull readonly align 1 %_1.0, [[USIZE]] %_1.1)
 // FIXME #25759 This should also have `nocapture`
 #[no_mangle]
 pub fn slice(_: &[u8]) {
 }
 
-// CHECK: @mutable_slice([0 x i8]* noalias nonnull align 1 %_1.0, [[USIZE]] %_1.1)
+// CHECK: @mutable_slice([0 x i8]* noalias noundef nonnull align 1 %_1.0, [[USIZE]] %_1.1)
 // FIXME #25759 This should also have `nocapture`
 #[no_mangle]
 pub fn mutable_slice(_: &mut [u8]) {
 }
 
-// CHECK: @unsafe_slice([0 x i16]* nonnull align 2 %_1.0, [[USIZE]] %_1.1)
+// CHECK: @unsafe_slice([0 x i16]* noundef nonnull align 2 %_1.0, [[USIZE]] %_1.1)
 // unsafe interior means this isn't actually readonly and there may be aliases ...
 #[no_mangle]
 pub fn unsafe_slice(_: &[UnsafeInner]) {
 }
 
-// CHECK: @str([0 x i8]* noalias nonnull readonly align 1 %_1.0, [[USIZE]] %_1.1)
+// CHECK: @raw_slice([0 x i8]* %_1.0, [[USIZE]] %_1.1)
+#[no_mangle]
+pub fn raw_slice(_: *const [u8]) {
+}
+
+// CHECK: @str([0 x i8]* noalias noundef nonnull readonly align 1 %_1.0, [[USIZE]] %_1.1)
 // FIXME #25759 This should also have `nocapture`
 #[no_mangle]
 pub fn str(_: &[u8]) {
 }
 
-// CHECK: @trait_borrow({}* nonnull align 1 %_1.0, [3 x [[USIZE]]]* noalias readonly align {{.*}} dereferenceable({{.*}}) %_1.1)
+// CHECK: @trait_borrow({}* noundef nonnull align 1 %_1.0, [3 x [[USIZE]]]* noalias noundef readonly align {{.*}} dereferenceable({{.*}}) %_1.1)
 // FIXME #25759 This should also have `nocapture`
 #[no_mangle]
 pub fn trait_borrow(_: &Drop) {
 }
 
-// CHECK: @trait_box({}* noalias nonnull align 1{{( %0)?}}, [3 x [[USIZE]]]* noalias readonly align {{.*}} dereferenceable({{.*}}){{( %1)?}})
+// CHECK: @trait_raw({}* %_1.0, [3 x [[USIZE]]]* noalias noundef readonly align {{.*}} dereferenceable({{.*}}) %_1.1)
+#[no_mangle]
+pub fn trait_raw(_: *const Drop) {
+}
+
+// CHECK: @trait_box({}* noalias noundef nonnull align 1{{( %0)?}}, [3 x [[USIZE]]]* noalias noundef readonly align {{.*}} dereferenceable({{.*}}){{( %1)?}})
 #[no_mangle]
 pub fn trait_box(_: Box<Drop>) {
 }
 
-// CHECK: { i8*, i8* } @trait_option(i8* noalias align 1 %x.0, i8* %x.1)
+// CHECK: { i8*, i8* } @trait_option(i8* noalias noundef align 1 %x.0, i8* %x.1)
 #[no_mangle]
 pub fn trait_option(x: Option<Box<Drop>>) -> Option<Box<Drop>> {
   x
 }
 
-// CHECK: { [0 x i16]*, [[USIZE]] } @return_slice([0 x i16]* noalias nonnull readonly align 2 %x.0, [[USIZE]] %x.1)
+// CHECK: { [0 x i16]*, [[USIZE]] } @return_slice([0 x i16]* noalias noundef nonnull readonly align 2 %x.0, [[USIZE]] %x.1)
 #[no_mangle]
 pub fn return_slice(x: &[u16]) -> &[u16] {
   x
@@ -139,7 +162,7 @@ pub fn enum_id_1(x: Option<Result<u16, u16>>) -> Option<Result<u16, u16>> {
   x
 }
 
-// CHECK: { i8, i8 } @enum_id_2(i1 zeroext %x.0, i8 %x.1)
+// CHECK: { i8, i8 } @enum_id_2(i1 noundef zeroext %x.0, i8 %x.1)
 #[no_mangle]
 pub fn enum_id_2(x: Option<u8>) -> Option<u8> {
   x
diff --git a/src/test/codegen/packed.rs b/src/test/codegen/packed.rs
index dfa7803d4f2f1..5d1fb80ec0051 100644
--- a/src/test/codegen/packed.rs
+++ b/src/test/codegen/packed.rs
@@ -52,7 +52,7 @@ pub struct BigPacked2 {
 #[no_mangle]
 pub fn call_pkd1(f: fn() -> Array) -> BigPacked1 {
 // CHECK: [[ALLOCA:%[_a-z0-9]+]] = alloca %Array
-// CHECK: call void %{{.*}}(%Array* noalias nocapture sret{{.*}} dereferenceable(32) [[ALLOCA]])
+// CHECK: call void %{{.*}}(%Array* noalias nocapture noundef sret{{.*}} dereferenceable(32) [[ALLOCA]])
 // CHECK: call void @llvm.memcpy.{{.*}}(i8* align 1 %{{.*}}, i8* align 4 %{{.*}}, i{{[0-9]+}} 32, i1 false)
     // check that calls whose destination is a field of a packed struct
     // go through an alloca rather than calling the function with an
@@ -64,7 +64,7 @@ pub fn call_pkd1(f: fn() -> Array) -> BigPacked1 {
 #[no_mangle]
 pub fn call_pkd2(f: fn() -> Array) -> BigPacked2 {
 // CHECK: [[ALLOCA:%[_a-z0-9]+]] = alloca %Array
-// CHECK: call void %{{.*}}(%Array* noalias nocapture sret{{.*}} dereferenceable(32) [[ALLOCA]])
+// CHECK: call void %{{.*}}(%Array* noalias nocapture noundef sret{{.*}} dereferenceable(32) [[ALLOCA]])
 // CHECK: call void @llvm.memcpy.{{.*}}(i8* align 2 %{{.*}}, i8* align 4 %{{.*}}, i{{[0-9]+}} 32, i1 false)
     // check that calls whose destination is a field of a packed struct
     // go through an alloca rather than calling the function with an
diff --git a/src/test/codegen/riscv-abi/riscv64-lp64-lp64f-lp64d-abi.rs b/src/test/codegen/riscv-abi/riscv64-lp64-lp64f-lp64d-abi.rs
index 693f0d99c4fff..c67406ea69338 100644
--- a/src/test/codegen/riscv-abi/riscv64-lp64-lp64f-lp64d-abi.rs
+++ b/src/test/codegen/riscv-abi/riscv64-lp64-lp64f-lp64d-abi.rs
@@ -1,15 +1,21 @@
-//
-// compile-flags: -C no-prepopulate-passes
-// only-riscv64
-// only-linux
+// compile-flags: --target riscv64gc-unknown-linux-gnu -C no-prepopulate-passes
+// needs-llvm-components: riscv
+
 #![crate_type = "lib"]
+#![no_core]
+#![feature(no_core, lang_items)]
 #![allow(improper_ctypes)]
 
+#[lang = "sized"]
+trait Sized {}
+#[lang = "copy"]
+trait Copy {}
+
 // CHECK: define void @f_void()
 #[no_mangle]
 pub extern "C" fn f_void() {}
 
-// CHECK: define zeroext i1 @f_scalar_0(i1 zeroext %a)
+// CHECK: define noundef zeroext i1 @f_scalar_0(i1 noundef zeroext %a)
 #[no_mangle]
 pub extern "C" fn f_scalar_0(a: bool) -> bool {
     a
@@ -70,8 +76,6 @@ pub struct Tiny {
 // CHECK: define void @f_agg_tiny(i64 %0)
 #[no_mangle]
 pub extern "C" fn f_agg_tiny(mut e: Tiny) {
-    e.a += e.b;
-    e.c += e.d;
 }
 
 // CHECK: define i64 @f_agg_tiny_ret()
@@ -89,14 +93,12 @@ pub struct Small {
 // CHECK: define void @f_agg_small([2 x i64] %0)
 #[no_mangle]
 pub extern "C" fn f_agg_small(mut x: Small) {
-    x.a += unsafe { *x.b };
-    x.b = &mut x.a;
 }
 
 // CHECK: define [2 x i64] @f_agg_small_ret()
 #[no_mangle]
 pub extern "C" fn f_agg_small_ret() -> Small {
-    Small { a: 1, b: core::ptr::null_mut() }
+    Small { a: 1, b: 0 as *mut _ }
 }
 
 #[repr(C)]
@@ -107,7 +109,6 @@ pub struct SmallAligned {
 // CHECK: define void @f_agg_small_aligned(i128 %0)
 #[no_mangle]
 pub extern "C" fn f_agg_small_aligned(mut x: SmallAligned) {
-    x.a += x.a;
 }
 
 #[repr(C)]
@@ -121,7 +122,6 @@ pub struct Large {
 // CHECK: define void @f_agg_large(%Large* {{.*}}%x)
 #[no_mangle]
 pub extern "C" fn f_agg_large(mut x: Large) {
-    x.a = x.b + x.c + x.d;
 }
 
 // CHECK: define void @f_agg_large_ret(%Large* {{.*}}sret{{.*}}, i32 signext %i, i8 signext %j)
@@ -172,7 +172,7 @@ pub unsafe extern "C" fn f_va_caller() {
         4.0f64,
         5.0f64,
         Tiny { a: 1, b: 2, c: 3, d: 4 },
-        Small { a: 10, b: core::ptr::null_mut() },
+        Small { a: 10, b: 0 as *mut _ },
         SmallAligned { a: 11 },
         Large { a: 12, b: 13, c: 14, d: 15 },
     );
diff --git a/src/test/codegen/scalar-pair-bool.rs b/src/test/codegen/scalar-pair-bool.rs
index 473272158d099..264f28fdb5fee 100644
--- a/src/test/codegen/scalar-pair-bool.rs
+++ b/src/test/codegen/scalar-pair-bool.rs
@@ -2,25 +2,25 @@
 
 #![crate_type = "lib"]
 
-// CHECK: define{{.*}}{ i8, i8 } @pair_bool_bool(i1 zeroext %pair.0, i1 zeroext %pair.1)
+// CHECK: define{{.*}}{ i8, i8 } @pair_bool_bool(i1 noundef zeroext %pair.0, i1 noundef zeroext %pair.1)
 #[no_mangle]
 pub fn pair_bool_bool(pair: (bool, bool)) -> (bool, bool) {
     pair
 }
 
-// CHECK: define{{.*}}{ i8, i32 } @pair_bool_i32(i1 zeroext %pair.0, i32 %pair.1)
+// CHECK: define{{.*}}{ i8, i32 } @pair_bool_i32(i1 noundef zeroext %pair.0, i32 %pair.1)
 #[no_mangle]
 pub fn pair_bool_i32(pair: (bool, i32)) -> (bool, i32) {
     pair
 }
 
-// CHECK: define{{.*}}{ i32, i8 } @pair_i32_bool(i32 %pair.0, i1 zeroext %pair.1)
+// CHECK: define{{.*}}{ i32, i8 } @pair_i32_bool(i32 %pair.0, i1 noundef zeroext %pair.1)
 #[no_mangle]
 pub fn pair_i32_bool(pair: (i32, bool)) -> (i32, bool) {
     pair
 }
 
-// CHECK: define{{.*}}{ i8, i8 } @pair_and_or(i1 zeroext %_1.0, i1 zeroext %_1.1)
+// CHECK: define{{.*}}{ i8, i8 } @pair_and_or(i1 noundef zeroext %_1.0, i1 noundef zeroext %_1.1)
 #[no_mangle]
 pub fn pair_and_or((a, b): (bool, bool)) -> (bool, bool) {
     // Make sure it can operate directly on the unpacked args
@@ -30,7 +30,7 @@ pub fn pair_and_or((a, b): (bool, bool)) -> (bool, bool) {
     (a && b, a || b)
 }
 
-// CHECK: define{{.*}}void @pair_branches(i1 zeroext %_1.0, i1 zeroext %_1.1)
+// CHECK: define{{.*}}void @pair_branches(i1 noundef zeroext %_1.0, i1 noundef zeroext %_1.1)
 #[no_mangle]
 pub fn pair_branches((a, b): (bool, bool)) {
     // Make sure it can branch directly on the unpacked bool args
diff --git a/src/test/codegen/transmute-scalar.rs b/src/test/codegen/transmute-scalar.rs
index e9584929f3a9e..a5aeb80de85c3 100644
--- a/src/test/codegen/transmute-scalar.rs
+++ b/src/test/codegen/transmute-scalar.rs
@@ -15,7 +15,7 @@ pub fn f32_to_bits(x: f32) -> u32 {
     unsafe { std::mem::transmute(x) }
 }
 
-// CHECK-LABEL: define{{.*}}i8 @bool_to_byte(i1 zeroext %b)
+// CHECK-LABEL: define{{.*}}i8 @bool_to_byte(i1 noundef zeroext %b)
 // CHECK: %1 = zext i1 %b to i8
 // CHECK-NEXT: store i8 %1, i8* %0
 // CHECK-NEXT: %2 = load i8, i8* %0
@@ -25,7 +25,7 @@ pub fn bool_to_byte(b: bool) -> u8 {
     unsafe { std::mem::transmute(b) }
 }
 
-// CHECK-LABEL: define{{.*}}zeroext i1 @byte_to_bool(i8 %byte)
+// CHECK-LABEL: define{{.*}}noundef zeroext i1 @byte_to_bool(i8 %byte)
 // CHECK: %1 = trunc i8 %byte to i1
 // CHECK-NEXT: %2 = zext i1 %1 to i8
 // CHECK-NEXT: store i8 %2, i8* %0
diff --git a/src/test/codegen/union-abi.rs b/src/test/codegen/union-abi.rs
index f282fd237054c..bb87d263bdf3d 100644
--- a/src/test/codegen/union-abi.rs
+++ b/src/test/codegen/union-abi.rs
@@ -75,7 +75,7 @@ pub union CUnionU128x2{a:(u128, u128)}
 pub fn test_CUnionU128x2(_: CUnionU128x2) { loop {} }
 
 pub union UnionBool { b:bool }
-// CHECK: define zeroext i1 @test_UnionBool(i8 %b)
+// CHECK: define noundef zeroext i1 @test_UnionBool(i8 %b)
 #[no_mangle]
 pub fn test_UnionBool(b: UnionBool) -> bool { unsafe { b.b }  }
 // CHECK: %0 = trunc i8 %b to i1