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| author | Dan Gohman <gohman@apple.com> | 2009-08-15 01:38:56 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-08-15 01:38:56 +0000 |
| commit | d6708eade079c30b0790789a00a8d737d84f52b7 (patch) | |
| tree | 720abdae44505cc03d2eade7835820c39c795c83 /test/CodeGen/X86/stdarg.ll | |
| parent | 6325a5305ea9665bb8291037df4849baabd13b81 (diff) | |
| download | external_llvm-d6708eade079c30b0790789a00a8d737d84f52b7.zip external_llvm-d6708eade079c30b0790789a00a8d737d84f52b7.tar.gz external_llvm-d6708eade079c30b0790789a00a8d737d84f52b7.tar.bz2 | |
On x86-64, for a varargs function, don't store the xmm registers to
the register save area if %al is 0. This avoids touching xmm
regsiters when they aren't actually used.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79061 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/stdarg.ll')
| -rw-r--r-- | test/CodeGen/X86/stdarg.ll | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/test/CodeGen/X86/stdarg.ll b/test/CodeGen/X86/stdarg.ll new file mode 100644 index 0000000..7207057 --- /dev/null +++ b/test/CodeGen/X86/stdarg.ll @@ -0,0 +1,20 @@ +; RUN: llvm-as < %s | llc -march=x86-64 | grep {testb \[%\]al, \[%\]al} + +%struct.__va_list_tag = type { i32, i32, i8*, i8* } + +define void @foo(i32 %x, ...) nounwind { +entry: + %ap = alloca [1 x %struct.__va_list_tag], align 8; <[1 x %struct.__va_list_tag]*> [#uses=2] + %ap12 = bitcast [1 x %struct.__va_list_tag]* %ap to i8*; <i8*> [#uses=2] + call void @llvm.va_start(i8* %ap12) + %ap3 = getelementptr inbounds [1 x %struct.__va_list_tag]* %ap, i64 0, i64 0; <%struct.__va_list_tag*> [#uses=1] + call void @bar(%struct.__va_list_tag* %ap3) nounwind + call void @llvm.va_end(i8* %ap12) + ret void +} + +declare void @llvm.va_start(i8*) nounwind + +declare void @bar(%struct.__va_list_tag*) + +declare void @llvm.va_end(i8*) nounwind |