diff options
Diffstat (limited to 'llvm/test/CodeGen/X86/add-sub-nsw-nuw.ll')
| -rw-r--r-- | llvm/test/CodeGen/X86/add-sub-nsw-nuw.ll | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/X86/add-sub-nsw-nuw.ll b/llvm/test/CodeGen/X86/add-sub-nsw-nuw.ll new file mode 100644 index 00000000000..f5bffb2386b --- /dev/null +++ b/llvm/test/CodeGen/X86/add-sub-nsw-nuw.ll @@ -0,0 +1,25 @@ +; NOTE: Assertions have been autogenerated by utils/update_test_checks.py +; RUN: llc -mtriple=i386-apple-darwin < %s | FileCheck %s + +; PR30841: https://llvm.org/bugs/show_bug.cgi?id=30841 +; Demanded bits analysis must disable nsw/nuw when it makes a +; simplification to add/sub such as in this case. + +define i8 @PR30841(i64 %argc) { +; CHECK-LABEL: PR30841: +; CHECK: ## BB#0: ## %entry +; CHECK-NEXT: movl {{[0-9]+}}(%esp), %eax +; CHECK-NEXT: negl %eax +; CHECK-NEXT: ## kill: %AL<def> %AL<kill> %EAX<kill> +; CHECK-NEXT: retl +; +entry: + %or = or i64 %argc, -4294967296 + br label %end + +end: + %neg = sub nuw nsw i64 -4294967296, %argc + %trunc = trunc i64 %neg to i8 + ret i8 %trunc +} + |
