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Add OPC_CheckChildSame0-3 to the DAG isel matcher. This replaces sequences of MoveChild, CheckSame, MoveParent. Saves 846 bytes from the X86 DAG isel matcher, ~300 from ARM, ~840 from Hexagon.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192026 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper
2013-10-05 05:38:16 +00:00
parent e8bcb9dd99
commit 936910d929
6 changed files with 75 additions and 1 deletions
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27
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@@ -2101,6 +2101,18 @@ CheckSame(const unsigned char *MatcherTable, unsigned &MatcherIndex,
return N == RecordedNodes[RecNo].first;
}
/// CheckChildSame - Implements OP_CheckChildXSame.
LLVM_ATTRIBUTE_ALWAYS_INLINE static bool
CheckChildSame(const unsigned char *MatcherTable, unsigned &MatcherIndex,
SDValue N,
const SmallVectorImpl<std::pair<SDValue, SDNode*> > &RecordedNodes,
unsigned ChildNo) {
if (ChildNo >= N.getNumOperands())
return false; // Match fails if out of range child #.
return ::CheckSame(MatcherTable, MatcherIndex, N.getOperand(ChildNo),
RecordedNodes);
}
/// CheckPatternPredicate - Implements OP_CheckPatternPredicate.
LLVM_ATTRIBUTE_ALWAYS_INLINE static bool
CheckPatternPredicate(const unsigned char *MatcherTable, unsigned &MatcherIndex,
@@ -2215,6 +2227,13 @@ static unsigned IsPredicateKnownToFail(const unsigned char *Table,
case SelectionDAGISel::OPC_CheckSame:
Result = !::CheckSame(Table, Index, N, RecordedNodes);
return Index;
case SelectionDAGISel::OPC_CheckChild0Same:
case SelectionDAGISel::OPC_CheckChild1Same:
case SelectionDAGISel::OPC_CheckChild2Same:
case SelectionDAGISel::OPC_CheckChild3Same:
Result = !::CheckChildSame(Table, Index, N, RecordedNodes,
Table[Index-1] - SelectionDAGISel::OPC_CheckChild0Same);
return Index;
case SelectionDAGISel::OPC_CheckPatternPredicate:
Result = !::CheckPatternPredicate(Table, Index, SDISel);
return Index;
@@ -2512,6 +2531,14 @@ SelectCodeCommon(SDNode *NodeToMatch, const unsigned char *MatcherTable,
case OPC_CheckSame:
if (!::CheckSame(MatcherTable, MatcherIndex, N, RecordedNodes)) break;
continue;
case OPC_CheckChild0Same: case OPC_CheckChild1Same:
case OPC_CheckChild2Same: case OPC_CheckChild3Same:
if (!::CheckChildSame(MatcherTable, MatcherIndex, N, RecordedNodes,
Opcode-OPC_CheckChild0Same))
break;
continue;
case OPC_CheckPatternPredicate:
if (!::CheckPatternPredicate(MatcherTable, MatcherIndex, *this)) break;
continue;