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Implement mulo x, 2 -> addo x, x in DAGCombiner.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131800 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2011-05-21 18:31:55 +00:00
parent a0962766ba
commit f55d26e788
2 changed files with 48 additions and 0 deletions
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24
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -165,6 +165,8 @@ namespace {
SDValue visitMULHS(SDNode *N);
SDValue visitSMUL_LOHI(SDNode *N);
SDValue visitUMUL_LOHI(SDNode *N);
SDValue visitSMULO(SDNode *N);
SDValue visitUMULO(SDNode *N);
SDValue visitSDIVREM(SDNode *N);
SDValue visitUDIVREM(SDNode *N);
SDValue visitAND(SDNode *N);
@ -1047,6 +1049,8 @@ SDValue DAGCombiner::visit(SDNode *N) {
case ISD::MULHS: return visitMULHS(N);
case ISD::SMUL_LOHI: return visitSMUL_LOHI(N);
case ISD::UMUL_LOHI: return visitUMUL_LOHI(N);
case ISD::SMULO: return visitSMULO(N);
case ISD::UMULO: return visitUMULO(N);
case ISD::SDIVREM: return visitSDIVREM(N);
case ISD::UDIVREM: return visitUDIVREM(N);
case ISD::AND: return visitAND(N);
@ -2177,6 +2181,26 @@ SDValue DAGCombiner::visitUMUL_LOHI(SDNode *N) {
return SDValue();
}
SDValue DAGCombiner::visitSMULO(SDNode *N) {
// (smulo x, 2) -> (saddo x, x)
if (ConstantSDNode *C2 = dyn_cast<ConstantSDNode>(N->getOperand(1)))
if (C2->getAPIntValue() == 2)
return DAG.getNode(ISD::SADDO, N->getDebugLoc(), N->getVTList(),
N->getOperand(0), N->getOperand(0));
return SDValue();
}
SDValue DAGCombiner::visitUMULO(SDNode *N) {
// (umulo x, 2) -> (uaddo x, x)
if (ConstantSDNode *C2 = dyn_cast<ConstantSDNode>(N->getOperand(1)))
if (C2->getAPIntValue() == 2)
return DAG.getNode(ISD::UADDO, N->getDebugLoc(), N->getVTList(),
N->getOperand(0), N->getOperand(0));
return SDValue();
}
SDValue DAGCombiner::visitSDIVREM(SDNode *N) {
SDValue Res = SimplifyNodeWithTwoResults(N, ISD::SDIV, ISD::SREM);
if (Res.getNode()) return Res;