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| author | Chris Lattner <sabre@nondot.org> | 2008-10-28 05:49:35 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2008-10-28 05:49:35 +0000 |
| commit | 4002a1b6f1cb7c7db7965bd281fb29664fd6c816 (patch) | |
| tree | 5a7bf8429810a521d763dda969ce626d9f382e3f /test/CodeGen/X86/2008-10-27-StackRealignment.ll | |
| parent | b3696d865e70c0153f82092d51999e5e55505427 (diff) | |
| download | external_llvm-4002a1b6f1cb7c7db7965bd281fb29664fd6c816.zip external_llvm-4002a1b6f1cb7c7db7965bd281fb29664fd6c816.tar.gz external_llvm-4002a1b6f1cb7c7db7965bd281fb29664fd6c816.tar.bz2 | |
Fix a nasty miscompilation of 176.gcc on linux/x86 where we synthesized
a memset using 16-byte XMM stores, but where the stack realignment code
didn't work. Until it does (PR2962) disable use of xmm regs in memcpy
and memset formation for linux and other targets with insufficiently
aligned stacks.
This is part of PR2888
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58317 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/2008-10-27-StackRealignment.ll')
| -rw-r--r-- | test/CodeGen/X86/2008-10-27-StackRealignment.ll | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/test/CodeGen/X86/2008-10-27-StackRealignment.ll b/test/CodeGen/X86/2008-10-27-StackRealignment.ll new file mode 100644 index 0000000..d8b0e70 --- /dev/null +++ b/test/CodeGen/X86/2008-10-27-StackRealignment.ll @@ -0,0 +1,22 @@ +; Linux doesn't support stack realignment for functions with allocas (PR2888). +; Until it does, we shouldn't use movaps to access the stack. On targets with +; sufficiently aligned stack (e.g. darwin) we should. + +; RUN: llvm-as < %s | llc -mtriple=i386-pc-linux-gnu -mcpu=yonah | not grep movaps +; RUN: llvm-as < %s | llc -mtriple=i686-apple-darwin9 -mcpu=yonah | grep movaps | count 2 + + +target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32" +target triple = "i386-pc-linux-gnu" + +define void @foo(i32 %t) nounwind { + %tmp1210 = alloca i8, i32 32, align 4 + call void @llvm.memset.i64(i8* %tmp1210, i8 0, i64 32, i32 4) + + %x = alloca i8, i32 %t + call void @dummy(i8* %x) + ret void +} + +declare void @dummy(i8* %x) +declare void @llvm.memset.i64(i8*, i8, i64, i32) nounwind |