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| author | Evan Cheng <evan.cheng@apple.com> | 2009-12-15 03:00:32 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2009-12-15 03:00:32 +0000 |
| commit | 9818c043d2ef1be70780de92bb42edd53d1da62a (patch) | |
| tree | dce080d6fe7af6bcf4d4b1bc2eda60cb09be32db /test/CodeGen/X86/zext-shl.ll | |
| parent | bc8858c3b058bbee5a1a1fd5950050cf610fd507 (diff) | |
| download | llvm-9818c043d2ef1be70780de92bb42edd53d1da62a.tar.gz llvm-9818c043d2ef1be70780de92bb42edd53d1da62a.tar.bz2 llvm-9818c043d2ef1be70780de92bb42edd53d1da62a.tar.xz | |
Make 91378 more conservative.
1. Only perform (zext (shl (zext x), y)) -> (shl (zext x), y) when y is a constant. This makes sure it remove at least one zest.
2. If the shift is a left shift, make sure the original shift cannot shift out bits.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91399 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/zext-shl.ll')
| -rw-r--r-- | test/CodeGen/X86/zext-shl.ll | 13 |
1 files changed, 0 insertions, 13 deletions
diff --git a/test/CodeGen/X86/zext-shl.ll b/test/CodeGen/X86/zext-shl.ll index bc3198a9d1..928848e3f7 100644 --- a/test/CodeGen/X86/zext-shl.ll +++ b/test/CodeGen/X86/zext-shl.ll @@ -23,16 +23,3 @@ entry: %2 = zext i16 %1 to i32 ret i32 %2 } - -define i32 @t3(i8 zeroext %x, i8 zeroext %y) nounwind readnone ssp { -entry: -; CHECK: t3: -; CHECK: shll -; CHECK-NOT: movzwl -; CHECK: ret - %0 = zext i8 %x to i16 - %1 = zext i8 %y to i16 - %2 = shl i16 %0, %1 - %3 = zext i16 %2 to i32 - ret i32 %3 -} |