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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 | 694488f4770468f03b974180631c0fbfa21b28cc (patch) | |
| tree | ff3af0445dfed3464a6c36bf37a5f8736a12097e /test/Transforms/InstCombine/sub.ll | |
| parent | 894c1af05fb3f0d8e2ee6565816fa220b260ed9d (diff) | |
| download | llvm-694488f4770468f03b974180631c0fbfa21b28cc.tar.gz llvm-694488f4770468f03b974180631c0fbfa21b28cc.tar.bz2 llvm-694488f4770468f03b974180631c0fbfa21b28cc.tar.xz | |
Add a small transform: transform -(X<<Y) to (-X<<Y) when the shift has a single
use and X is free to negate.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94941 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/InstCombine/sub.ll')
| -rw-r--r-- | test/Transforms/InstCombine/sub.ll | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/sub.ll b/test/Transforms/InstCombine/sub.ll index fa0322a44e..29bd7be2ff 100644 --- a/test/Transforms/InstCombine/sub.ll +++ b/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 +} |