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switch the value# in OPC_CompleteMatch and OPC_EmitNode to use a

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VBR encoding for the insanity being perpetrated by the spu backend. 

llvm-svn: 96843
This commit is contained in:
Chris Lattner 2010-02-23 00:59:59 +00:00
parent b35408e8df
commit 68fd68d9ff
2 changed files with 53 additions and 5 deletions
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24
include/llvm/CodeGen/DAGISelHeader.h
View File

@ -200,6 +200,24 @@ GetInt8(const unsigned char *MatcherTable, unsigned &Idx) {
return Val;
}
/// GetVBR - decode a vbr encoding whose top bit is set.
ALWAYS_INLINE static unsigned
GetVBR(unsigned Val, const unsigned char *MatcherTable, unsigned &Idx) {
assert(Val >= 128 && "Not a VBR");
Val &= 127; // Remove first vbr bit.
unsigned Shift = 7;
unsigned NextBits;
do {
NextBits = GetInt1(MatcherTable, Idx);
Val |= (NextBits&127) << Shift;
Shift += 7;
} while (NextBits & 128);
return Val;
}
enum BuiltinOpcodes {
OPC_Push, OPC_Push2,
OPC_RecordNode,
@ -691,6 +709,9 @@ SDNode *SelectCodeCommon(SDNode *NodeToMatch, const unsigned char *MatcherTable,
SmallVector<SDValue, 8> Ops;
for (unsigned i = 0; i != NumOps; ++i) {
unsigned RecNo = MatcherTable[MatcherIndex++];
if (RecNo & 128)
RecNo = GetVBR(RecNo, MatcherTable, MatcherIndex);
assert(RecNo < RecordedNodes.size() && "Invalid CheckSame");
Ops.push_back(RecordedNodes[RecNo]);
}
@ -763,6 +784,9 @@ SDNode *SelectCodeCommon(SDNode *NodeToMatch, const unsigned char *MatcherTable,
for (unsigned i = 0; i != NumResults; ++i) {
unsigned ResSlot = MatcherTable[MatcherIndex++];
if (ResSlot & 128)
ResSlot = GetVBR(ResSlot, MatcherTable, MatcherIndex);
assert(ResSlot < RecordedNodes.size() && "Invalid CheckSame");
SDValue Res = RecordedNodes[ResSlot];

34
utils/TableGen/DAGISelMatcherEmitter.cpp
View File

@ -127,6 +127,25 @@ private:
};
} // end anonymous namespace.
/// EmitVBRValue - Emit the specified value as a VBR, returning the number of
/// bytes emitted.
static unsigned EmitVBRValue(unsigned Val, raw_ostream &OS) {
if (Val <= 127) {
OS << Val << ", ";
return 1;
}
unsigned InVal = Val;
unsigned NumBytes = 0;
while (Val > 128) {
OS << (Val&127) << "|128,";
Val >>= 7;
++NumBytes;
}
OS << Val << "/*" << InVal << "*/, ";
return NumBytes+1;
}
/// EmitMatcherOpcodes - Emit bytes for the specified matcher and return
/// the number of bytes emitted.
unsigned MatcherTableEmitter::
@ -309,22 +328,27 @@ EmitMatcher(const MatcherNode *N, unsigned Indent, formatted_raw_ostream &OS) {
OS << getEnumName(EN->getVT(i)) << ", ";
OS << EN->getNumOperands() << "/*#Ops*/, ";
for (unsigned i = 0, e = EN->getNumOperands(); i != e; ++i)
OS << EN->getOperand(i) << ", ";
unsigned NumOperandBytes = 0;
for (unsigned i = 0, e = EN->getNumOperands(); i != e; ++i) {
// We emit the operand numbers in VBR encoded format, in case the number
// is too large to represent with a byte.
NumOperandBytes += EmitVBRValue(EN->getOperand(i), OS);
}
OS << '\n';
return 6+EN->getNumVTs()+EN->getNumOperands();
return 6+EN->getNumVTs()+NumOperandBytes;
}
case MatcherNode::CompleteMatch: {
const CompleteMatchMatcherNode *CM = cast<CompleteMatchMatcherNode>(N);
OS << "OPC_CompleteMatch, " << CM->getNumResults() << ", ";
unsigned NumResultBytes = 0;
for (unsigned i = 0, e = CM->getNumResults(); i != e; ++i)
OS << CM->getResult(i) << ", ";
NumResultBytes += EmitVBRValue(CM->getResult(i), OS);
OS << '\n';
OS.PadToColumn(Indent*2) << "// Src: "
<< *CM->getPattern().getSrcPattern() << '\n';
OS.PadToColumn(Indent*2) << "// Dst: "
<< *CM->getPattern().getDstPattern() << '\n';
return 2+CM->getNumResults();
return 2 + NumResultBytes;
}
}
assert(0 && "Unreachable");