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| author | Yingwei Zheng <dtcxzyw2333@gmail.com> | 2024-02-26 15:55:56 +0800 |
|---|---|---|
| committer | Tom Stellard <tstellar@redhat.com> | 2024-02-26 13:43:35 -0800 |
| commit | 3aea3d2fd3996808ab39de0cf718b292a7d52a5f (patch) | |
| tree | dd7925158e56812e19396c481965bc15e614da49 /llvm/test | |
| parent | 9d51bd1c2476ce334b3370c5f073e24427171e5f (diff) | |
| download | llvm-3aea3d2fd3996808ab39de0cf718b292a7d52a5f.zip llvm-3aea3d2fd3996808ab39de0cf718b292a7d52a5f.tar.gz llvm-3aea3d2fd3996808ab39de0cf718b292a7d52a5f.tar.bz2 | |
[GVN] Drop nsw/nuw flags when replacing the result of a with.overflow intrinsic with a overflowing binary operator (#82935)
Alive2: https://alive2.llvm.org/ce/z/gyL7mn
Fixes https://github.com/llvm/llvm-project/issues/82884.
(cherry picked from commit 892b4beeac50920e630f10905b2916295e2eb6d8)
Diffstat (limited to 'llvm/test')
| -rw-r--r-- | llvm/test/Transforms/GVN/pr82884.ll | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/llvm/test/Transforms/GVN/pr82884.ll b/llvm/test/Transforms/GVN/pr82884.ll new file mode 100644 index 0000000..71abafd --- /dev/null +++ b/llvm/test/Transforms/GVN/pr82884.ll @@ -0,0 +1,21 @@ +; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4 +; RUN: opt -S -passes=gvn < %s | FileCheck %s + +; Make sure nsw/nuw flags are dropped. + +define i32 @pr82884(i32 %x) { +; CHECK-LABEL: define i32 @pr82884( +; CHECK-SAME: i32 [[X:%.*]]) { +; CHECK-NEXT: [[MUL:%.*]] = mul i32 [[X]], [[X]] +; CHECK-NEXT: call void @use(i32 [[MUL]]) +; CHECK-NEXT: [[MUL2:%.*]] = call { i32, i1 } @llvm.smul.with.overflow.i32(i32 [[X]], i32 [[X]]) +; CHECK-NEXT: ret i32 [[MUL]] +; + %mul = mul nsw nuw i32 %x, %x + call void @use(i32 %mul) + %mul2 = call { i32, i1 } @llvm.smul.with.overflow.i32(i32 %x, i32 %x) + %ret = extractvalue { i32, i1 } %mul2, 0 + ret i32 %ret +} + +declare void @use(i32) |