diff options
| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-09-01 22:15:35 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-09-01 22:15:35 +0000 |
| commit | 0077114efc8c1680e58980d05606ada2708c4295 (patch) | |
| tree | c2b1c9d9eb5bf1869c1a0c410b8fa3f8149b628d /test/CodeGen/X86/2010-09-01-RemoveCopyByCommutingDef.ll | |
| parent | a314afe6582302d1764d1b85557ec47174acd60f (diff) | |
| download | llvm-0077114efc8c1680e58980d05606ada2708c4295.tar.gz llvm-0077114efc8c1680e58980d05606ada2708c4295.tar.bz2 llvm-0077114efc8c1680e58980d05606ada2708c4295.tar.xz | |
Teach RemoveCopyByCommutingDef to check all aliases, not just subregisters.
This caused a miscompilation in WebKit where %RAX had conflicting defs when
RemoveCopyByCommutingDef was commuting a %EAX use.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112751 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/2010-09-01-RemoveCopyByCommutingDef.ll')
| -rw-r--r-- | test/CodeGen/X86/2010-09-01-RemoveCopyByCommutingDef.ll | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/test/CodeGen/X86/2010-09-01-RemoveCopyByCommutingDef.ll b/test/CodeGen/X86/2010-09-01-RemoveCopyByCommutingDef.ll new file mode 100644 index 0000000000..e5542baf2e --- /dev/null +++ b/test/CodeGen/X86/2010-09-01-RemoveCopyByCommutingDef.ll @@ -0,0 +1,28 @@ +; RUN: llc < %s -verify-machineinstrs | FileCheck %s +target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64" +target triple = "x86_64-apple-darwin10.0.0" + +; This test exercises the alias checking in SimpleRegisterCoalescing::RemoveCopyByCommutingDef. + +define void @f(i32* %w, i32* %h, i8* %_this, i8* %image) nounwind ssp { + %x1 = tail call i64 @g(i8* %_this, i8* %image) nounwind ; <i64> [#uses=3] + %tmp1 = trunc i64 %x1 to i32 ; <i32> [#uses=1] +; CHECK: movl (%r{{.*}}), % + %x4 = load i32* %h, align 4 ; <i32> [#uses=1] + +; The imull clobbers a 32-bit register. +; CHECK: imull %{{...}}, %e[[CLOBBER:..]] + %x5 = mul nsw i32 %x4, %tmp1 ; <i32> [#uses=1] + +; So we cannot use the corresponding 64-bit register anymore. +; CHECK-NOT: shrq $32, %r[[CLOBBER]] + %btmp3 = lshr i64 %x1, 32 ; <i64> [#uses=1] + %btmp4 = trunc i64 %btmp3 to i32 ; <i32> [#uses=1] + +; CHECK: idiv + %x6 = sdiv i32 %x5, %btmp4 ; <i32> [#uses=1] + store i32 %x6, i32* %w, align 4 + ret void +} + +declare i64 @g(i8*, i8*) |