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[DAGCombiner] reduce code duplication; NFC 

llvm-svn: 374370
This commit is contained in:
Sanjay Patel 2019-10-10 15:38:29 +00:00
parent ff054b9e32
commit 7f0e7c0b1c
1 changed files with 4 additions and 2 deletions
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6
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -8225,13 +8225,15 @@ SDValue DAGCombiner::foldSelectOfConstants(SDNode *N) {
// extend and add. Use a target hook because some targets may prefer to
// transform in the other direction.
if (TLI.convertSelectOfConstantsToMath(VT)) {
if (C1->getAPIntValue() - 1 == C2->getAPIntValue()) {
const APInt &C1Val = C1->getAPIntValue();
const APInt &C2Val = C2->getAPIntValue();
if (C1Val - 1 == C2Val) {
// select Cond, C1, C1-1 --> add (zext Cond), C1-1
if (VT != MVT::i1)
Cond = DAG.getNode(ISD::ZERO_EXTEND, DL, VT, Cond);
return DAG.getNode(ISD::ADD, DL, VT, Cond, N2);
}
if (C1->getAPIntValue() + 1 == C2->getAPIntValue()) {
if (C1Val + 1 == C2Val) {
// select Cond, C1, C1+1 --> add (sext Cond), C1+1
if (VT != MVT::i1)
Cond = DAG.getNode(ISD::SIGN_EXTEND, DL, VT, Cond);