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[CodeGen] Add OPC_MoveChild0-OPC_MoveChild7 opcodes to isel matching tables to optimize table size. Shaves about 12K off the X86 matcher table.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268209 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper 2016-05-02 01:53:30 +00:00
parent f974ccff67
commit b5bf834f5d
3 changed files with 24 additions and 3 deletions
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2
include/llvm/CodeGen/SelectionDAGISel.h
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@ -111,6 +111,8 @@ public:
OPC_RecordMemRef,
OPC_CaptureGlueInput,
OPC_MoveChild,
OPC_MoveChild0, OPC_MoveChild1, OPC_MoveChild2, OPC_MoveChild3,
OPC_MoveChild4, OPC_MoveChild5, OPC_MoveChild6, OPC_MoveChild7,
OPC_MoveParent,
OPC_CheckSame,
OPC_CheckChild0Same, OPC_CheckChild1Same,

12
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -2971,6 +2971,18 @@ SelectCodeCommon(SDNode *NodeToMatch, const unsigned char *MatcherTable,
continue;
}
case OPC_MoveChild0: case OPC_MoveChild1:
case OPC_MoveChild2: case OPC_MoveChild3:
case OPC_MoveChild4: case OPC_MoveChild5:
case OPC_MoveChild6: case OPC_MoveChild7: {
unsigned ChildNo = Opcode-OPC_MoveChild0;
if (ChildNo >= N.getNumOperands())
break; // Match fails if out of range child #.
N = N.getOperand(ChildNo);
NodeStack.push_back(N);
continue;
}
case OPC_MoveParent:
// Pop the current node off the NodeStack.
NodeStack.pop_back();

13
utils/TableGen/DAGISelMatcherEmitter.cpp
View File

@ -247,9 +247,16 @@ EmitMatcher(const Matcher *N, unsigned Indent, unsigned CurrentIdx,
OS << "OPC_CaptureGlueInput,\n";
return 1;
case Matcher::MoveChild:
OS << "OPC_MoveChild, " << cast<MoveChildMatcher>(N)->getChildNo() << ",\n";
return 2;
case Matcher::MoveChild: {
const auto *MCM = cast<MoveChildMatcher>(N);
OS << "OPC_MoveChild";
// Handle the specialized forms.
if (MCM->getChildNo() >= 8)
OS << ", ";
OS << MCM->getChildNo() << ",\n";
return (MCM->getChildNo() >= 8) ? 2 : 1;
}
case Matcher::MoveParent:
OS << "OPC_MoveParent,\n";