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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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10
lib/Transforms/InstCombine/InstCombineAddSub.cpp
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@ -1250,6 +1250,16 @@ Instruction *InstCombiner::visitSub(BinaryOperator &I) {
if (SimplifyDemandedInstructionBits(I))
return &I;
// Fold (sub 0, (zext bool to B)) --> (sext bool to B)
if (C->isZero() && match(Op1, m_ZExt(m_Value(X))))
if (X->getType()->isIntegerTy(1))
return CastInst::CreateSExtOrBitCast(X, Op1->getType());
// Fold (sub 0, (sext bool to B)) --> (zext bool to B)
if (C->isZero() && match(Op1, m_SExt(m_Value(X))))
if (X->getType()->isIntegerTy(1))
return CastInst::CreateZExtOrBitCast(X, Op1->getType());
}

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
}

9
test/Transforms/InstCombine/sext.ll
View File

@ -184,3 +184,12 @@ define i32 @test16(i16 %x) nounwind {
; CHECK-NEXT: %ext = sext i16 %sext to i32
; CHECK-NEXT: ret i32 %ext
}
define i32 @test17(i1 %x) nounwind {
%c1 = sext i1 %x to i32
%c2 = sub i32 0, %c1
ret i32 %c2
; CHECK: @test17
; CHECK-NEXT: [[TEST17:%.*]] = zext i1 %x to i32
; CHECK-NEXT: ret i32 [[TEST17]]
}

4
test/Transforms/InstCombine/zext-bool-add-sub.ll
View File

@ -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