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Try operation promotion only if regular dag combine and target-specific ones failed to do anything.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102492 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-04-28 07:10:39 +00:00
parent 39cfeecae5
commit b3a3d5e858
1 changed files with 42 additions and 15 deletions
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57
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -1011,7 +1011,7 @@ void DAGCombiner::Run(CombineLevel AtLevel) {
}
SDValue DAGCombiner::visit(SDNode *N) {
switch(N->getOpcode()) {
switch (N->getOpcode()) {
default: break;
case ISD::TokenFactor: return visitTokenFactor(N);
case ISD::MERGE_VALUES: return visitMERGE_VALUES(N);
@ -1096,6 +1096,35 @@ SDValue DAGCombiner::combine(SDNode *N) {
}
}
// If nothing happened still, try promoting the operation.
if (RV.getNode() == 0) {
switch (N->getOpcode()) {
default: break;
case ISD::ADD:
case ISD::SUB:
case ISD::MUL:
case ISD::AND:
case ISD::OR:
case ISD::XOR:
RV = PromoteIntBinOp(SDValue(N, 0));
break;
case ISD::SHL:
case ISD::SRA:
case ISD::SRL:
RV = PromoteIntShiftOp(SDValue(N, 0));
break;
case ISD::SIGN_EXTEND:
case ISD::ZERO_EXTEND:
case ISD::ANY_EXTEND:
RV = PromoteExtend(SDValue(N, 0));
break;
case ISD::LOAD:
if (PromoteLoad(SDValue(N, 0)))
RV = SDValue(N, 0);
break;
}
}
// If N is a commutative binary node, try commuting it to enable more
// sdisel CSE.
if (RV.getNode() == 0 &&
@ -1387,7 +1416,7 @@ SDValue DAGCombiner::visitADD(SDNode *N) {
N0.getOperand(0).getOperand(1),
N0.getOperand(1)));
return PromoteIntBinOp(SDValue(N, 0));
return SDValue();
}
SDValue DAGCombiner::visitADDC(SDNode *N) {
@ -1525,7 +1554,7 @@ SDValue DAGCombiner::visitSUB(SDNode *N) {
VT);
}
return PromoteIntBinOp(SDValue(N, 0));
return SDValue();
}
SDValue DAGCombiner::visitMUL(SDNode *N) {
@ -1618,7 +1647,7 @@ SDValue DAGCombiner::visitMUL(SDNode *N) {
if (RMUL.getNode() != 0)
return RMUL;
return PromoteIntBinOp(SDValue(N, 0));
return SDValue();
}
SDValue DAGCombiner::visitSDIV(SDNode *N) {
@ -2264,7 +2293,7 @@ SDValue DAGCombiner::visitAND(SDNode *N) {
}
}
return PromoteIntBinOp(SDValue(N, 0));
return SDValue();
}
SDValue DAGCombiner::visitOR(SDNode *N) {
@ -2390,7 +2419,7 @@ SDValue DAGCombiner::visitOR(SDNode *N) {
if (SDNode *Rot = MatchRotate(N0, N1, N->getDebugLoc()))
return SDValue(Rot, 0);
return PromoteIntBinOp(SDValue(N, 0));
return SDValue();
}
/// MatchRotateHalf - Match "(X shl/srl V1) & V2" where V2 may not be present.
@ -2699,7 +2728,7 @@ SDValue DAGCombiner::visitXOR(SDNode *N) {
SimplifyDemandedBits(SDValue(N, 0)))
return SDValue(N, 0);
return PromoteIntBinOp(SDValue(N, 0));
return SDValue();
}
/// visitShiftByConstant - Handle transforms common to the three shifts, when
@ -2866,7 +2895,7 @@ SDValue DAGCombiner::visitSHL(SDNode *N) {
return NewSHL;
}
return PromoteIntShiftOp(SDValue(N, 0));
return SDValue();
}
SDValue DAGCombiner::visitSRA(SDNode *N) {
@ -2986,7 +3015,7 @@ SDValue DAGCombiner::visitSRA(SDNode *N) {
return NewSRA;
}
return PromoteIntShiftOp(SDValue(N, 0));
return SDValue();
}
SDValue DAGCombiner::visitSRL(SDNode *N) {
@ -3152,7 +3181,7 @@ SDValue DAGCombiner::visitSRL(SDNode *N) {
}
}
return PromoteIntShiftOp(SDValue(N, 0));
return SDValue();
}
SDValue DAGCombiner::visitCTLZ(SDNode *N) {
@ -3550,7 +3579,7 @@ SDValue DAGCombiner::visitSIGN_EXTEND(SDNode *N) {
DAG.SignBitIsZero(N0))
return DAG.getNode(ISD::ZERO_EXTEND, N->getDebugLoc(), VT, N0);
return PromoteExtend(SDValue(N, 0));
return SDValue();
}
SDValue DAGCombiner::visitZERO_EXTEND(SDNode *N) {
@ -3713,7 +3742,7 @@ SDValue DAGCombiner::visitZERO_EXTEND(SDNode *N) {
N0.getOperand(1)));
}
return PromoteExtend(SDValue(N, 0));
return SDValue();
}
SDValue DAGCombiner::visitANY_EXTEND(SDNode *N) {
@ -3849,7 +3878,7 @@ SDValue DAGCombiner::visitANY_EXTEND(SDNode *N) {
return SCC;
}
return PromoteExtend(SDValue(N, 0));
return SDValue();
}
/// GetDemandedBits - See if the specified operand can be simplified with the
@ -5451,8 +5480,6 @@ SDValue DAGCombiner::visitLOAD(SDNode *N) {
if (CombineToPreIndexedLoadStore(N) || CombineToPostIndexedLoadStore(N))
return SDValue(N, 0);
if (PromoteLoad(SDValue(N, 0)))
return SDValue(N, 0);
return SDValue();
}