92ef545b8d
When replacing return values with undef, we should also drop the noundef attribute (and other UB implying attributes). Differential Revision: https://reviews.llvm.org/D144461
56 lines
1.6 KiB
LLVM
56 lines
1.6 KiB
LLVM
; RUN: opt -S -passes=ipsccp < %s | FileCheck %s
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@g = external global i8
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define internal noundef i32 @ret_noundef() {
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; CHECK-LABEL: define internal i32 @ret_noundef() {
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; CHECK-NEXT: ret i32 undef
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;
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ret i32 0
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}
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define internal dereferenceable(1) ptr @ret_dereferenceable() {
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; CHECK-LABEL: define internal ptr @ret_dereferenceable() {
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; CHECK-NEXT: ret ptr undef
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;
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ret ptr @g
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}
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define internal dereferenceable_or_null(1) ptr @ret_dereferenceable_or_null() {
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; CHECK-LABEL: define internal ptr @ret_dereferenceable_or_null() {
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; CHECK-NEXT: ret ptr undef
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;
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ret ptr @g
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}
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; Non-null is fine, because it does not cause immediate UB.
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define internal nonnull ptr @ret_nonnull() {
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; CHECK-LABEL: define internal nonnull ptr @ret_nonnull() {
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; CHECK-NEXT: ret ptr undef
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;
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ret ptr @g
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}
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define internal nonnull ptr @ret_nonnull_noundef() {
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; CHECK-LABEL: define internal nonnull ptr @ret_nonnull_noundef() {
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; CHECK-NEXT: ret ptr undef
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;
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ret ptr @g
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}
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define void @test() {
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; CHECK-LABEL: define void @test() {
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; CHECK-NEXT: [[TMP1:%.*]] = call i32 @ret_noundef()
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; CHECK-NEXT: [[TMP2:%.*]] = call ptr @ret_dereferenceable()
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; CHECK-NEXT: [[TMP3:%.*]] = call ptr @ret_dereferenceable_or_null()
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; CHECK-NEXT: [[TMP4:%.*]] = call nonnull ptr @ret_nonnull()
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; CHECK-NEXT: [[TMP5:%.*]] = call nonnull ptr @ret_nonnull_noundef()
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; CHECK-NEXT: ret void
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;
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call noundef i32 @ret_noundef()
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call dereferenceable(1) ptr @ret_dereferenceable()
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call dereferenceable_or_null(1) ptr @ret_dereferenceable_or_null()
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call nonnull ptr @ret_nonnull()
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call nonnull noundef ptr @ret_nonnull_noundef()
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ret void
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}
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