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Simplify some code, add a couple minor missed folds
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28152 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1664,33 +1664,30 @@ SDOperand DAGCombiner::visitSRL(SDNode *N) {
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SDOperand DAGCombiner::visitCTLZ(SDNode *N) {
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SDOperand N0 = N->getOperand(0);
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ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
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MVT::ValueType VT = N->getValueType(0);
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// fold (ctlz c1) -> c2
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if (N0C)
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if (isa<ConstantSDNode>(N0))
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return DAG.getNode(ISD::CTLZ, VT, N0);
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return SDOperand();
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}
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SDOperand DAGCombiner::visitCTTZ(SDNode *N) {
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SDOperand N0 = N->getOperand(0);
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ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
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MVT::ValueType VT = N->getValueType(0);
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// fold (cttz c1) -> c2
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if (N0C)
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if (isa<ConstantSDNode>(N0))
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return DAG.getNode(ISD::CTTZ, VT, N0);
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return SDOperand();
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}
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SDOperand DAGCombiner::visitCTPOP(SDNode *N) {
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SDOperand N0 = N->getOperand(0);
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ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
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MVT::ValueType VT = N->getValueType(0);
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// fold (ctpop c1) -> c2
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if (N0C)
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if (isa<ConstantSDNode>(N0))
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return DAG.getNode(ISD::CTPOP, VT, N0);
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return SDOperand();
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}
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@ -1790,21 +1787,24 @@ SDOperand DAGCombiner::visitSETCC(SDNode *N) {
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SDOperand DAGCombiner::visitSIGN_EXTEND(SDNode *N) {
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SDOperand N0 = N->getOperand(0);
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ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
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MVT::ValueType VT = N->getValueType(0);
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// fold (sext c1) -> c1
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if (N0C)
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if (ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0))
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return DAG.getNode(ISD::SIGN_EXTEND, VT, N0);
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// fold (sext (sext x)) -> (sext x)
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if (N0.getOpcode() == ISD::SIGN_EXTEND)
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// fold (sext (aext x)) -> (sext x)
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if (N0.getOpcode() == ISD::SIGN_EXTEND || N0.getOpcode() == ISD::ANY_EXTEND)
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return DAG.getNode(ISD::SIGN_EXTEND, VT, N0.getOperand(0));
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// fold (sext (truncate x)) -> (sextinreg x) iff x size == sext size.
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if (N0.getOpcode() == ISD::TRUNCATE && N0.getOperand(0).getValueType() == VT&&
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(!AfterLegalize ||
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TLI.isOperationLegal(ISD::SIGN_EXTEND_INREG, N0.getValueType())))
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return DAG.getNode(ISD::SIGN_EXTEND_INREG, VT, N0.getOperand(0),
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DAG.getValueType(N0.getValueType()));
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// fold (sext (load x)) -> (sext (truncate (sextload x)))
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if (N0.getOpcode() == ISD::LOAD && N0.hasOneUse() &&
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(!AfterLegalize||TLI.isOperationLegal(ISD::SEXTLOAD, N0.getValueType()))){
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@ -1835,14 +1835,14 @@ SDOperand DAGCombiner::visitSIGN_EXTEND(SDNode *N) {
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SDOperand DAGCombiner::visitZERO_EXTEND(SDNode *N) {
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SDOperand N0 = N->getOperand(0);
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ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
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MVT::ValueType VT = N->getValueType(0);
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// fold (zext c1) -> c1
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if (N0C)
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if (ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0))
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return DAG.getNode(ISD::ZERO_EXTEND, VT, N0);
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// fold (zext (zext x)) -> (zext x)
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if (N0.getOpcode() == ISD::ZERO_EXTEND)
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// fold (zext (aext x)) -> (zext x)
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if (N0.getOpcode() == ISD::ZERO_EXTEND || N0.getOpcode() == ISD::ANY_EXTEND)
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return DAG.getNode(ISD::ZERO_EXTEND, VT, N0.getOperand(0));
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// fold (zext (truncate x)) -> (zextinreg x) iff x size == zext size.
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if (N0.getOpcode() == ISD::TRUNCATE && N0.getOperand(0).getValueType() == VT&&
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@ -1877,11 +1877,10 @@ SDOperand DAGCombiner::visitZERO_EXTEND(SDNode *N) {
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SDOperand DAGCombiner::visitANY_EXTEND(SDNode *N) {
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SDOperand N0 = N->getOperand(0);
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ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
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MVT::ValueType VT = N->getValueType(0);
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// fold (aext c1) -> c1
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if (N0C)
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if (isa<ConstantSDNode>(N0))
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return DAG.getNode(ISD::ANY_EXTEND, VT, N0);
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// fold (aext (aext x)) -> (aext x)
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// fold (aext (zext x)) -> (zext x)
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@ -1927,16 +1926,13 @@ SDOperand DAGCombiner::visitANY_EXTEND(SDNode *N) {
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SDOperand DAGCombiner::visitSIGN_EXTEND_INREG(SDNode *N) {
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SDOperand N0 = N->getOperand(0);
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SDOperand N1 = N->getOperand(1);
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ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
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MVT::ValueType VT = N->getValueType(0);
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MVT::ValueType EVT = cast<VTSDNode>(N1)->getVT();
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unsigned EVTBits = MVT::getSizeInBits(EVT);
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// fold (sext_in_reg c1) -> c1
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if (N0C) {
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SDOperand Truncate = DAG.getConstant(N0C->getValue(), EVT);
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return DAG.getNode(ISD::SIGN_EXTEND, VT, Truncate);
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}
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if (isa<ConstantSDNode>(N0))
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return DAG.getNode(ISD::SIGN_EXTEND_INREG, VT, N0, N1);
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// If the input is already sign extended, just drop the extension.
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if (TLI.ComputeNumSignBits(N0) >= MVT::getSizeInBits(VT)-EVTBits+1)
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@ -1978,14 +1974,13 @@ SDOperand DAGCombiner::visitSIGN_EXTEND_INREG(SDNode *N) {
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SDOperand DAGCombiner::visitTRUNCATE(SDNode *N) {
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SDOperand N0 = N->getOperand(0);
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ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
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MVT::ValueType VT = N->getValueType(0);
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// noop truncate
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if (N0.getValueType() == N->getValueType(0))
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return N0;
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// fold (truncate c1) -> c1
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if (N0C)
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if (isa<ConstantSDNode>(N0))
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return DAG.getNode(ISD::TRUNCATE, VT, N0);
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// fold (truncate (truncate x)) -> (truncate x)
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if (N0.getOpcode() == ISD::TRUNCATE)
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