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[DAGCombiner] use dyn_cast values in foldSelectOfConstants(); NFC

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296502 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjay Patel 2017-02-28 18:41:49 +00:00
parent 584a5d174f
commit 0e267e802a
1 changed files with 8 additions and 6 deletions
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14
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -5677,7 +5677,9 @@ SDValue DAGCombiner::foldSelectOfConstants(SDNode *N) {
if (!VT.isInteger())
return SDValue();
if (!isa<ConstantSDNode>(N1) || !isa<ConstantSDNode>(N2))
auto *C1 = dyn_cast<ConstantSDNode>(N1);
auto *C2 = dyn_cast<ConstantSDNode>(N2);
if (!C1 || !C2)
return SDValue();
// Only do this before legalization to avoid conflicting with target-specific
@ -5687,27 +5689,27 @@ SDValue DAGCombiner::foldSelectOfConstants(SDNode *N) {
// TODO: This could be generalized for any 2 constants that differ by 1:
// add ({s/z}ext Cond), C
if (CondVT == MVT::i1 && !LegalOperations) {
if (isNullConstant(N1) && isOneConstant(N2)) {
if (C1->isNullValue() && C2->isOne()) {
// select Cond, 0, 1 --> zext (!Cond)
SDValue NotCond = DAG.getNOT(DL, Cond, MVT::i1);
if (VT != MVT::i1)
NotCond = DAG.getNode(ISD::ZERO_EXTEND, DL, VT, NotCond);
return NotCond;
}
if (isNullConstant(N1) && isAllOnesConstant(N2)) {
if (C1->isNullValue() && C2->isAllOnesValue()) {
// select Cond, 0, -1 --> sext (!Cond)
SDValue NotCond = DAG.getNOT(DL, Cond, MVT::i1);
if (VT != MVT::i1)
NotCond = DAG.getNode(ISD::SIGN_EXTEND, DL, VT, NotCond);
return NotCond;
}
if (isOneConstant(N1) && isNullConstant(N2)) {
if (C1->isOne() && C2->isNullValue()) {
// select Cond, 1, 0 --> zext (Cond)
if (VT != MVT::i1)
Cond = DAG.getNode(ISD::ZERO_EXTEND, DL, VT, Cond);
return Cond;
}
if (isAllOnesConstant(N1) && isNullConstant(N2)) {
if (C1->isAllOnesValue() && C2->isNullValue()) {
// select Cond, -1, 0 --> sext (Cond)
if (VT != MVT::i1)
Cond = DAG.getNode(ISD::SIGN_EXTEND, DL, VT, Cond);
@ -5730,7 +5732,7 @@ SDValue DAGCombiner::foldSelectOfConstants(SDNode *N) {
TargetLowering::ZeroOrOneBooleanContent &&
TLI.getBooleanContents(false, false) ==
TargetLowering::ZeroOrOneBooleanContent &&
isNullConstant(N1) && isOneConstant(N2)) {
C1->isNullValue() && C2->isOne()) {
SDValue NotCond =
DAG.getNode(ISD::XOR, DL, CondVT, Cond, DAG.getConstant(1, DL, CondVT));
if (VT.bitsEq(CondVT))