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[InstCombine] simplify min/max canonicalization; NFCI

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llvm-svn: 326828
This commit is contained in:
Sanjay Patel 2018-03-06 19:01:18 +00:00
parent 83408784f9
commit 45734a8fc3
1 changed files with 5 additions and 10 deletions
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15
lib/Transforms/InstCombine/InstCombineSelect.cpp
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@ -713,23 +713,18 @@ canonicalizeMinMaxWithConstant(SelectInst &Sel, ICmpInst &Cmp,
// Canonicalize the compare predicate based on whether we have min or max.
Value *LHS, *RHS;
ICmpInst::Predicate NewPred;
SelectPatternResult SPR = matchSelectPattern(&Sel, LHS, RHS);
switch (SPR.Flavor) {
case SPF_SMIN: NewPred = ICmpInst::ICMP_SLT; break;
case SPF_UMIN: NewPred = ICmpInst::ICMP_ULT; break;
case SPF_SMAX: NewPred = ICmpInst::ICMP_SGT; break;
case SPF_UMAX: NewPred = ICmpInst::ICMP_UGT; break;
default: return nullptr;
}
if (!SelectPatternResult::isMinOrMax(SPR.Flavor))
return nullptr;
// Is this already canonical?
ICmpInst::Predicate CanonicalPred = getMinMaxPred(SPR.Flavor);
if (Cmp.getOperand(0) == LHS && Cmp.getOperand(1) == RHS &&
Cmp.getPredicate() == NewPred)
Cmp.getPredicate() == CanonicalPred)
return nullptr;
// Create the canonical compare and plug it into the select.
Sel.setCondition(Builder.CreateICmp(NewPred, LHS, RHS));
Sel.setCondition(Builder.CreateICmp(CanonicalPred, LHS, RHS));
// If the select operands did not change, we're done.
if (Sel.getTrueValue() == LHS && Sel.getFalseValue() == RHS)