diff options
| author | Benjamin Kramer <benny.kra@googlemail.com> | 2011-05-21 18:31:55 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2011-05-21 18:31:55 +0000 |
| commit | f55d26e78851c2c09f8b09cfd7e7bbda7130d93b (patch) | |
| tree | 420bfca4a2ba0d09f6d3e9253b6d847c4bd76724 /lib/CodeGen/SelectionDAG/DAGCombiner.cpp | |
| parent | a0962766baa84a7dcf8d594b91aa45ea1336696f (diff) | |
Implement mulo x, 2 -> addo x, x in DAGCombiner.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131800 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index b6ebdfe810..4f56ab6f1e 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -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; |