diff options
| author | Dan Gohman <gohman@apple.com> | 2009-09-15 00:14:11 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-09-15 00:14:11 +0000 |
| commit | 907355caf89549138ab3ea0e4ab13a5df0ee014a (patch) | |
| tree | b56c5968a255a1e06ade7332652715c2fcbee3f6 /test | |
| parent | e6798372ea38e5ea24c26282a0d69aa6e3829854 (diff) | |
| download | llvm-907355caf89549138ab3ea0e4ab13a5df0ee014a.tar.gz llvm-907355caf89549138ab3ea0e4ab13a5df0ee014a.tar.bz2 llvm-907355caf89549138ab3ea0e4ab13a5df0ee014a.tar.xz | |
On x86-64, the 32-bit cmov doesn't actually clear the high 32-bit of
its result if the condition is false.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81814 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/CodeGen/X86/cmov-zext.ll | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/test/CodeGen/X86/cmov-zext.ll b/test/CodeGen/X86/cmov-zext.ll new file mode 100644 index 0000000000..8df228a00a --- /dev/null +++ b/test/CodeGen/X86/cmov-zext.ll @@ -0,0 +1,19 @@ +; RUN: llc < %s -march=x86-64 | FileCheck %s + +; x86's 32-bit cmov doesn't clobber the high 32 bits of the destination +; if the condition is false. An explicit zero-extend (movl) is needed +; after the cmov. + +; CHECK: cmovne %edi, %esi +; CHECK-NEXT: movl %esi, %edi + +declare void @bar(i64) nounwind + +define void @foo(i64 %a, i64 %b, i1 %p) nounwind { + %c = trunc i64 %a to i32 + %d = trunc i64 %b to i32 + %e = select i1 %p, i32 %c, i32 %d + %f = zext i32 %e to i64 + call void @bar(i64 %f) + ret void +} |