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revert r299851 - [InstCombine] fix matching of or-of-icmps constants (PR32524)

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This is a candidate culprit for multiple bot fails, so reverting pending investigation.

llvm-svn: 299955
This commit is contained in:
Sanjay Patel 2017-04-11 15:57:32 +00:00
parent dca6bbbba0
commit 8663bd080f
2 changed files with 16 additions and 19 deletions
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28
lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
View File

@ -807,7 +807,6 @@ Value *InstCombiner::FoldAndOfICmps(ICmpInst *LHS, ICmpInst *RHS) {
}
}
// FIXME: The code below is duplicated in FoldOrOfICmps.
// From here on, we only handle:
// (icmp1 A, C1) & (icmp2 A, C2) --> something simpler.
if (LHS0 != RHS0)
@ -826,14 +825,11 @@ Value *InstCombiner::FoldAndOfICmps(ICmpInst *LHS, ICmpInst *RHS) {
// Ensure that the larger constant is on the RHS.
bool ShouldSwap;
if (CmpInst::isUnsigned(PredL) || CmpInst::isUnsigned(PredR)) {
// We have an unsigned compare (possibly with an equality compare), so treat
// the constants as unsigned.
ShouldSwap = LHSC->getValue().ugt(RHSC->getValue());
} else {
// Equality transforms treat the constants as signed.
if (CmpInst::isSigned(PredL) ||
(ICmpInst::isEquality(PredL) && CmpInst::isSigned(PredR)))
ShouldSwap = LHSC->getValue().sgt(RHSC->getValue());
}
else
ShouldSwap = LHSC->getValue().ugt(RHSC->getValue());
if (ShouldSwap) {
std::swap(LHS, RHS);
@ -881,6 +877,10 @@ Value *InstCombiner::FoldAndOfICmps(ICmpInst *LHS, ICmpInst *RHS) {
case ICmpInst::ICMP_SGT: // (X != 13 & X s> 15) -> X s> 15
return RHS;
case ICmpInst::ICMP_NE:
// Special case to get the ordering right when the values wrap around
// zero.
if (LHSC->getValue() == 0 && RHSC->getValue().isAllOnesValue())
std::swap(LHSC, RHSC);
if (LHSC == SubOne(RHSC)) { // (X != 13 & X != 14) -> X-13 >u 1
Constant *AddC = ConstantExpr::getNeg(LHSC);
Value *Add = Builder->CreateAdd(LHS0, AddC, LHS0->getName() + ".off");
@ -1727,7 +1727,6 @@ Value *InstCombiner::FoldOrOfICmps(ICmpInst *LHS, ICmpInst *RHS,
return Builder->CreateICmpULE(LHS0, LHSC);
}
// FIXME: The code below is duplicated in FoldAndOfICmps.
// From here on, we only handle:
// (icmp1 A, C1) | (icmp2 A, C2) --> something simpler.
if (LHS0 != RHS0)
@ -1746,14 +1745,11 @@ Value *InstCombiner::FoldOrOfICmps(ICmpInst *LHS, ICmpInst *RHS,
// Ensure that the larger constant is on the RHS.
bool ShouldSwap;
if (CmpInst::isUnsigned(PredL) || CmpInst::isUnsigned(PredR)) {
// We have an unsigned compare (possibly with an equality compare), so treat
// the constants as unsigned.
ShouldSwap = LHSC->getValue().ugt(RHSC->getValue());
} else {
// Equality transforms treat the constants as signed.
if (CmpInst::isSigned(PredL) ||
(ICmpInst::isEquality(PredL) && CmpInst::isSigned(PredR)))
ShouldSwap = LHSC->getValue().sgt(RHSC->getValue());
}
else
ShouldSwap = LHSC->getValue().ugt(RHSC->getValue());
if (ShouldSwap) {
std::swap(LHS, RHS);

7
test/Transforms/InstCombine/or.ll
View File

@ -223,9 +223,10 @@ define i1 @test19(i32 %A) {
define i1 @or_icmps_eq_diff1(i32 %x) {
; CHECK-LABEL: @or_icmps_eq_diff1(
; CHECK-NEXT: [[X_OFF:%.*]] = add i32 %x, 1
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i32 [[X_OFF]], 2
; CHECK-NEXT: ret i1 [[TMP1]]
; CHECK-NEXT: [[CMP1:%.*]] = icmp eq i32 %x, -1
; CHECK-NEXT: [[CMP2:%.*]] = icmp eq i32 %x, 0
; CHECK-NEXT: [[LOGIC:%.*]] = or i1 [[CMP1]], [[CMP2]]
; CHECK-NEXT: ret i1 [[LOGIC]]
;
%cmp1 = icmp eq i32 %x, -1
%cmp2 = icmp eq i32 %x, 0