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| author | Dan Gohman <gohman@apple.com> | 2010-07-23 18:03:30 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2010-07-23 18:03:30 +0000 |
| commit | a4f4d699ec627e798357929295aecd3d55b8d703 (patch) | |
| tree | 944ff423164cbdafb494cff07b41174d461f2da3 /test/CodeGen/X86/shl-anyext.ll | |
| parent | 7c98283f0ef74a5663c4c4a0938a344b204336fd (diff) | |
| download | llvm-a4f4d699ec627e798357929295aecd3d55b8d703.tar.gz llvm-a4f4d699ec627e798357929295aecd3d55b8d703.tar.bz2 llvm-a4f4d699ec627e798357929295aecd3d55b8d703.tar.xz | |
DAGCombine (shl (anyext x, c)) to (anyext (shl x, c)) if the high bits
are not demanded. This often allows the anyext to be folded away.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109242 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/shl-anyext.ll')
| -rw-r--r-- | test/CodeGen/X86/shl-anyext.ll | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/test/CodeGen/X86/shl-anyext.ll b/test/CodeGen/X86/shl-anyext.ll new file mode 100644 index 0000000000..6dc95317d1 --- /dev/null +++ b/test/CodeGen/X86/shl-anyext.ll @@ -0,0 +1,18 @@ +; RUN: llc -march=x86-64 < %s | FileCheck %s + +; Codegen should be able to use a 32-bit shift instead of a 64-bit shift. +; CHECK: shll $16 + +define fastcc void @test(i32 %level, i64 %a, i64 %b, i64 %c, i64 %d, i32* %p) nounwind { +if.end523: ; preds = %if.end453 + %conv7981749 = zext i32 %level to i64 ; <i64> [#uses=1] + %and799 = shl i64 %conv7981749, 16 ; <i64> [#uses=1] + %shl800 = and i64 %and799, 16711680 ; <i64> [#uses=1] + %or801 = or i64 %shl800, %a ; <i64> [#uses=1] + %or806 = or i64 %or801, %b ; <i64> [#uses=1] + %or811 = or i64 %or806, %c ; <i64> [#uses=1] + %or819 = or i64 %or811, %d ; <i64> [#uses=1] + %conv820 = trunc i64 %or819 to i32 ; <i32> [#uses=1] + store i32 %conv820, i32* %p + ret void +} |