[InstCombine] Add tests for memset with undef/poison value (NFC)

diff --git a/llvm/test/Transforms/InstCombine/memset.ll b/llvm/test/Transforms/InstCombine/memset.ll
index 81ac83d..95048f5 100644 (file)
--- a/llvm/test/Transforms/InstCombine/memset.ll
+++ b/llvm/test/Transforms/InstCombine/memset.ll
@@ -33,4 +33,40 @@ define void @memset_to_constant() {
   ret void
 }
 
+define void @memset_undef(i8* %p) {
+; CHECK-LABEL: @memset_undef(
+; CHECK-NEXT:    call void @llvm.memset.p0i8.i32(i8* noundef nonnull align 1 dereferenceable(8) [[P:%.*]], i8 undef, i32 8, i1 false)
+; CHECK-NEXT:    ret void
+;
+  call void @llvm.memset.p0i8.i32(i8* %p, i8 undef, i32 8, i1 false)
+  ret void
+}
+
+define void @memset_undef_volatile(i8* %p) {
+; CHECK-LABEL: @memset_undef_volatile(
+; CHECK-NEXT:    call void @llvm.memset.p0i8.i32(i8* [[P:%.*]], i8 undef, i32 8, i1 true)
+; CHECK-NEXT:    ret void
+;
+  call void @llvm.memset.p0i8.i32(i8* %p, i8 undef, i32 8, i1 true)
+  ret void
+}
+
+define void @memset_poison(i8* %p) {
+; CHECK-LABEL: @memset_poison(
+; CHECK-NEXT:    call void @llvm.memset.p0i8.i32(i8* noundef nonnull align 1 dereferenceable(8) [[P:%.*]], i8 undef, i32 8, i1 false)
+; CHECK-NEXT:    ret void
+;
+  call void @llvm.memset.p0i8.i32(i8* %p, i8 undef, i32 8, i1 false)
+  ret void
+}
+
+define void @memset_poison_volatile(i8* %p) {
+; CHECK-LABEL: @memset_poison_volatile(
+; CHECK-NEXT:    call void @llvm.memset.p0i8.i32(i8* [[P:%.*]], i8 poison, i32 8, i1 true)
+; CHECK-NEXT:    ret void
+;
+  call void @llvm.memset.p0i8.i32(i8* %p, i8 poison, i32 8, i1 true)
+  ret void
+}
+
 declare void @llvm.memset.p0i8.i32(i8* nocapture writeonly, i8, i32, i1) argmemonly nounwind