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Transform (sub 0, (zext bool to A)) to (sext bool to A) and

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(sub 0, (sext bool to A)) to (zext bool to A).

Patch by Muhammad Ahmad
Reviewed by Duncan Sands


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173093 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Paul Redmond
2013-01-21 21:57:20 +00:00
parent e4b1efef8a
commit 8e528100d2
4 changed files with 22 additions and 4 deletions
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3
test/Transforms/InstCombine/mul.ll
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@@ -138,8 +138,7 @@ define i32 @test16(i32 %b, i1 %c) {
; e = b & (a >> 31)
%e = mul i32 %d, %b ; <i32> [#uses=1]
ret i32 %e
; CHECK: [[TEST16:%.*]] = zext i1 %c to i32
; CHECK-NEXT: %1 = sub i32 0, [[TEST16]]
; CHECK: [[TEST16:%.*]] = sext i1 %c to i32
; CHECK-NEXT: %e = and i32 %1, %b
; CHECK-NEXT: ret i32 %e
}