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[LegalizeVectorOps] Expand vector MERGE_VALUES immediately. 

Custom legalization can produce MERGE_VALUES to return multiple
results. We can expand them immediately instead of leaving them
around for DAG combine to clean up.
This commit is contained in:
Craig Topper 2020-01-11 16:04:28 -08:00
parent f719c540bb
commit ddfcd82bdc
1 changed files with 11 additions and 0 deletions
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11
llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
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@ -332,6 +332,13 @@ SDValue VectorLegalizer::LegalizeOp(SDValue Op) {
switch (Op.getOpcode()) {
default:
return TranslateLegalizeResults(Op, Node);
case ISD::MERGE_VALUES:
Action = TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0));
// This operation lies about being legal: when it claims to be legal,
// it should actually be expanded.
if (Action == TargetLowering::Legal)
Action = TargetLowering::Expand;
break;
#define INSTRUCTION(NAME, NARG, ROUND_MODE, INTRINSIC, DAGN) \
case ISD::STRICT_##DAGN:
#include "llvm/IR/ConstrainedOps.def"
@ -834,6 +841,10 @@ SDValue VectorLegalizer::ExpandStore(SDNode *N) {
void VectorLegalizer::Expand(SDNode *Node, SmallVectorImpl<SDValue> &Results) {
SDValue Tmp;
switch (Node->getOpcode()) {
case ISD::MERGE_VALUES:
for (unsigned i = 0, e = Node->getNumValues(); i != e; ++i)
Results.push_back(Node->getOperand(i));
return;
case ISD::SIGN_EXTEND_INREG:
Results.push_back(ExpandSEXTINREG(Node));
return;