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[DAG] remove duplicated code for isOnlyUsedInZeroEqualityComparison(); NFCI

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@304822 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjay Patel 2017-06-06 19:40:09 +00:00
parent 46747f1821
commit 946c51ffec
1 changed files with 1 additions and 15 deletions
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16
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@ -5998,20 +5998,6 @@ void SelectionDAGBuilder::LowerCallTo(ImmutableCallSite CS, SDValue Callee,
}
}
/// Return true if it only matters that the value is equal or not-equal to zero.
static bool IsOnlyUsedInZeroEqualityComparison(const Value *V) {
for (const User *U : V->users()) {
if (const ICmpInst *IC = dyn_cast<ICmpInst>(U))
if (IC->isEquality())
if (const Constant *C = dyn_cast<Constant>(IC->getOperand(1)))
if (C->isNullValue())
continue;
// Unknown instruction.
return false;
}
return true;
}
static SDValue getMemCmpLoad(const Value *PtrVal, MVT LoadVT,
SelectionDAGBuilder &Builder) {
@ -6098,7 +6084,7 @@ bool SelectionDAGBuilder::visitMemCmpCall(const CallInst &I) {
// memcmp(S1,S2,2) != 0 -> (*(short*)LHS != *(short*)RHS) != 0
// memcmp(S1,S2,4) != 0 -> (*(int*)LHS != *(int*)RHS) != 0
if (!CSize || !IsOnlyUsedInZeroEqualityComparison(&I))
if (!CSize || !isOnlyUsedInZeroEqualityComparison(&I))
return false;
// If the target has a fast compare for the given size, it will return a