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fold insertelement(buildvector) -> buildvector if the inserted element # is

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a constant.  This implements test_constant_insert in CodeGen/Generic/vector.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26851 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-03-19 01:27:56 +00:00
parent 152c72d88a
commit ca24244234
1 changed files with 42 additions and 0 deletions
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42
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -209,6 +209,8 @@ namespace {
SDOperand visitBR_CC(SDNode *N);
SDOperand visitLOAD(SDNode *N);
SDOperand visitSTORE(SDNode *N);
SDOperand visitINSERT_VECTOR_ELT(SDNode *N);
SDOperand visitVINSERT_VECTOR_ELT(SDNode *N);
SDOperand ReassociateOps(unsigned Opc, SDOperand LHS, SDOperand RHS);
@ -640,6 +642,8 @@ SDOperand DAGCombiner::visit(SDNode *N) {
case ISD::BR_CC: return visitBR_CC(N);
case ISD::LOAD: return visitLOAD(N);
case ISD::STORE: return visitSTORE(N);
case ISD::INSERT_VECTOR_ELT: return visitINSERT_VECTOR_ELT(N);
case ISD::VINSERT_VECTOR_ELT: return visitVINSERT_VECTOR_ELT(N);
}
return SDOperand();
}
@ -2290,6 +2294,44 @@ SDOperand DAGCombiner::visitSTORE(SDNode *N) {
return SDOperand();
}
SDOperand DAGCombiner::visitINSERT_VECTOR_ELT(SDNode *N) {
SDOperand InVec = N->getOperand(0);
SDOperand InVal = N->getOperand(1);
SDOperand EltNo = N->getOperand(2);
// If the invec is a BUILD_VECTOR and if EltNo is a constant, build a new
// vector with the inserted element.
if (InVec.getOpcode() == ISD::BUILD_VECTOR && isa<ConstantSDNode>(EltNo)) {
unsigned Elt = cast<ConstantSDNode>(EltNo)->getValue();
std::vector<SDOperand> Ops(InVec.Val->op_begin(), InVec.Val->op_end());
if (Elt < Ops.size())
Ops[Elt] = InVal;
return DAG.getNode(ISD::BUILD_VECTOR, InVec.getValueType(), Ops);
}
return SDOperand();
}
SDOperand DAGCombiner::visitVINSERT_VECTOR_ELT(SDNode *N) {
SDOperand InVec = N->getOperand(0);
SDOperand InVal = N->getOperand(1);
SDOperand EltNo = N->getOperand(2);
SDOperand NumElts = N->getOperand(3);
SDOperand EltType = N->getOperand(4);
// If the invec is a VBUILD_VECTOR and if EltNo is a constant, build a new
// vector with the inserted element.
if (InVec.getOpcode() == ISD::VBUILD_VECTOR && isa<ConstantSDNode>(EltNo)) {
unsigned Elt = cast<ConstantSDNode>(EltNo)->getValue();
std::vector<SDOperand> Ops(InVec.Val->op_begin(), InVec.Val->op_end());
if (Elt < Ops.size()-2)
Ops[Elt] = InVal;
return DAG.getNode(ISD::VBUILD_VECTOR, InVec.getValueType(), Ops);
}
return SDOperand();
}
SDOperand DAGCombiner::SimplifySelect(SDOperand N0, SDOperand N1, SDOperand N2){
assert(N0.getOpcode() ==ISD::SETCC && "First argument must be a SetCC node!");