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Removed a hack intended to allow (store (op (load))) folding. Will handle this with preprocessing.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29258 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-07-21 22:19:51 +00:00
parent 25c2a2f570
commit e6389935a9
1 changed files with 7 additions and 52 deletions
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59
utils/TableGen/DAGISelEmitter.cpp
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@ -2123,7 +2123,6 @@ private:
std::vector<std::string> &TargetVTs;
std::string ChainName;
bool NewTF;
bool DoReplace;
unsigned TmpNo;
unsigned OpcNo;
@ -2159,7 +2158,7 @@ public:
bool dorep)
: ISE(ise), Predicates(preds), Pattern(pattern), Instruction(instr),
GeneratedCode(gc), GeneratedDecl(gd), TargetOpcodes(to), TargetVTs(tv),
NewTF(false), DoReplace(dorep), TmpNo(0), OpcNo(0), VTNo(0) {}
DoReplace(dorep), TmpNo(0), OpcNo(0), VTNo(0) {}
/// EmitMatchCode - Emit a matcher for N, going to the label for PatternNo
/// if the match fails. At this point, we already know that the opcode for N
@ -2293,19 +2292,14 @@ public:
}
if (NodeHasChain) {
if (FoundChain)
emitCheck("Chain.Val == " + RootName + ".Val");
else
FoundChain = true;
ChainName = "Chain" + ChainSuffix;
emitDecl(ChainName);
if (FoundChain) {
// FIXME: temporary workaround for a common case where chain
// is a TokenFactor and the previous "inner" chain is an operand.
NewTF = true;
emitDecl("OldTF", 1);
emitCheck("(" + ChainName + " = UpdateFoldedChain(CurDAG, " +
RootName + ".Val, Chain.Val, OldTF)).Val");
} else {
FoundChain = true;
emitCode(ChainName + " = " + RootName + ".getOperand(0);");
}
emitCode(ChainName + " = " + RootName +
".getOperand(0);");
}
}
@ -2762,11 +2756,6 @@ public:
if (!isRoot)
return std::make_pair(1, ResNo);
if (NewTF)
emitCode("if (OldTF) "
"SelectionDAG::InsertISelMapEntry(CodeGenMap, OldTF, 0, " +
ChainName + ".Val, 0);");
for (unsigned i = 0; i < NumResults; i++)
emitCode("SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, " +
utostr(i) + ", ResNode, " + utostr(i) + ");");
@ -3739,40 +3728,6 @@ void DAGISelEmitter::run(std::ostream &OS) {
OS << " }\n";
OS << "}\n";
OS << "\n";
OS << "// UpdateFoldedChain - return a SDOperand of the new chain created\n";
OS << "// if the folding were to happen. This is called when, for example,\n";
OS << "// a load is folded into a store. If the store's chain is the load,\n";
OS << "// then the resulting node's input chain would be the load's input\n";
OS << "// chain. If the store's chain is a TokenFactor and the load's\n";
OS << "// output chain feeds into in, then the new chain is a TokenFactor\n";
OS << "// with the other operands along with the input chain of the load.\n";
OS << "SDOperand UpdateFoldedChain(SelectionDAG *DAG, SDNode *N, "
<< "SDNode *Chain, SDNode* &OldTF) {\n";
OS << " OldTF = NULL;\n";
OS << " if (N == Chain) {\n";
OS << " return N->getOperand(0);\n";
OS << " } else if (Chain->getOpcode() == ISD::TokenFactor &&\n";
OS << " N->isOperand(Chain)) {\n";
OS << " SDOperand Ch = SDOperand(Chain, 0);\n";
OS << " std::map<SDOperand, SDOperand>::iterator CGMI = "
<< "CodeGenMap.find(Ch);\n";
OS << " if (CGMI != CodeGenMap.end())\n";
OS << " return SDOperand(0, 0);\n";
OS << " OldTF = Chain;\n";
OS << " std::vector<SDOperand> Ops;\n";
OS << " for (unsigned i = 0; i < Chain->getNumOperands(); ++i) {\n";
OS << " SDOperand Op = Chain->getOperand(i);\n";
OS << " if (Op.Val == N)\n";
OS << " Ops.push_back(N->getOperand(0));\n";
OS << " else\n";
OS << " Ops.push_back(Op);\n";
OS << " }\n";
OS << " return DAG->getNode(ISD::TokenFactor, MVT::Other, Ops);\n";
OS << " }\n";
OS << " return SDOperand(0, 0);\n";
OS << "}\n";
OS << "\n";
OS << "// SelectRoot - Top level entry to DAG isel.\n";
OS << "SDOperand SelectRoot(SDOperand N) {\n";