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| author | Eli Friedman <eli.friedman@gmail.com> | 2010-01-31 02:30:23 +0000 |
|---|---|---|
| committer | Eli Friedman <eli.friedman@gmail.com> | 2010-01-31 02:30:23 +0000 |
| commit | 37a8197b6174e5e7d3597e93e4f3cdf119485d15 (patch) | |
| tree | 66c155540ab0909b28a05b0fb2c78ac50eebbb48 /llvm/test | |
| parent | 9aeccadce40881bc136e05a5a62e0071f792dc1c (diff) | |
| download | bcm5719-llvm-37a8197b6174e5e7d3597e93e4f3cdf119485d15.tar.gz bcm5719-llvm-37a8197b6174e5e7d3597e93e4f3cdf119485d15.zip | |
Add a small transform: transform -(X<<Y) to (-X<<Y) when the shift has a single
use and X is free to negate.
llvm-svn: 94941
Diffstat (limited to 'llvm/test')
| -rw-r--r-- | llvm/test/Transforms/InstCombine/sub.ll | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/sub.ll b/llvm/test/Transforms/InstCombine/sub.ll index fa0322a44e8..29bd7be2ff8 100644 --- a/llvm/test/Transforms/InstCombine/sub.ll +++ b/llvm/test/Transforms/InstCombine/sub.ll @@ -272,4 +272,12 @@ define i64 @test25(i8* %P, i64 %A){ ; CHECK-NEXT: ret i64 } +define i32 @test26(i32 %x) { + %shl = shl i32 3, %x + %neg = sub i32 0, %shl + ret i32 %neg +; CHECK: @test26 +; CHECK-NEXT: shl i32 -3 +; CHECK-NEXT: ret i32 +} |
