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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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4
test/Transforms/InstCombine/zext-bool-add-sub.ll
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@@ -4,9 +4,9 @@
define i32 @a(i1 zeroext %x, i1 zeroext %y) {
entry:
; CHECK: @a
; CHECK: [[TMP1:%.*]] = zext i1 %y to i32
; CHECK: [[TMP1:%.*]] = sext i1 %y to i32
; CHECK: [[TMP2:%.*]] = select i1 %x, i32 2, i32 1
; CHECK-NEXT: sub i32 [[TMP2]], [[TMP1]]
; CHECK-NEXT: add i32 [[TMP2]], [[TMP1]]
%conv = zext i1 %x to i32
%conv3 = zext i1 %y to i32
%conv3.neg = sub i32 0, %conv3