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MC/AsmMatcher: Add support for creating tied operands when constructing MCInsts.

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- Pretty messy, but we need to rework how we handle tied operands in MCInst
   anyway.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95774 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar 2010-02-10 08:15:48 +00:00
parent 5dccfadbf4
commit af61681ced
1 changed files with 67 additions and 9 deletions
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76
utils/TableGen/AsmMatcherEmitter.cpp
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@ -944,10 +944,29 @@ void AsmMatcherInfo::BuildInfo(CodeGenTarget &Target) {
OperandName.str() + "'");
}
const CodeGenInstruction::OperandInfo &OI = II->Instr->OperandList[Idx];
// FIXME: This is annoying, the named operand may be tied (e.g.,
// XCHG8rm). What we want is the untied operand, which we now have to
// grovel for. Only worry about this for single entry operands, we have to
// clean this up anyway.
const CodeGenInstruction::OperandInfo *OI = &II->Instr->OperandList[Idx];
if (OI->Constraints[0].isTied()) {
unsigned TiedOp = OI->Constraints[0].getTiedOperand();
// The tied operand index is an MIOperand index, find the operand that
// contains it.
for (unsigned i = 0, e = II->Instr->OperandList.size(); i != e; ++i) {
if (II->Instr->OperandList[i].MIOperandNo == TiedOp) {
OI = &II->Instr->OperandList[i];
break;
}
}
assert(OI && "Unable to find tied operand target!");
}
InstructionInfo::Operand Op;
Op.Class = getOperandClass(Token, OI);
Op.OperandInfo = &OI;
Op.Class = getOperandClass(Token, *OI);
Op.OperandInfo = OI;
II->Operands.push_back(Op);
}
}
@ -996,6 +1015,19 @@ static void EmitConvertToMCInst(CodeGenTarget &Target,
if (Op.OperandInfo)
MIOperandList.push_back(std::make_pair(Op.OperandInfo->MIOperandNo, i));
}
// Find any tied operands.
SmallVector<std::pair<unsigned, unsigned>, 4> TiedOperands;
for (unsigned i = 0, e = II.Instr->OperandList.size(); i != e; ++i) {
const CodeGenInstruction::OperandInfo &OpInfo = II.Instr->OperandList[i];
for (unsigned j = 0, e = OpInfo.Constraints.size(); j != e; ++j) {
const CodeGenInstruction::ConstraintInfo &CI = OpInfo.Constraints[j];
if (CI.isTied())
TiedOperands.push_back(std::make_pair(OpInfo.MIOperandNo + j,
CI.getTiedOperand()));
}
}
std::sort(MIOperandList.begin(), MIOperandList.end());
// Compute the total number of operands.
@ -1014,14 +1046,23 @@ static void EmitConvertToMCInst(CodeGenTarget &Target,
assert(CurIndex <= Op.OperandInfo->MIOperandNo &&
"Duplicate match for instruction operand!");
Signature += "_";
// Skip operands which weren't matched by anything, this occurs when the
// .td file encodes "implicit" operands as explicit ones.
//
// FIXME: This should be removed from the MCInst structure.
for (; CurIndex != Op.OperandInfo->MIOperandNo; ++CurIndex)
Signature += "Imp";
for (; CurIndex != Op.OperandInfo->MIOperandNo; ++CurIndex) {
// See if this is a tied operand.
unsigned i, e = TiedOperands.size();
for (i = 0; i != e; ++i)
if (CurIndex == TiedOperands[i].first)
break;
if (i == e)
Signature += "__Imp";
else
Signature += "__Tie" + utostr(TiedOperands[i].second);
}
Signature += "__";
// Registers are always converted the same, don't duplicate the conversion
// function based on them.
@ -1060,8 +1101,25 @@ static void EmitConvertToMCInst(CodeGenTarget &Target,
InstructionInfo::Operand &Op = II.Operands[MIOperandList[i].second];
// Add the implicit operands.
for (; CurIndex != Op.OperandInfo->MIOperandNo; ++CurIndex)
CvtOS << " Inst.addOperand(MCOperand::CreateReg(0));\n";
for (; CurIndex != Op.OperandInfo->MIOperandNo; ++CurIndex) {
// See if this is a tied operand.
unsigned i, e = TiedOperands.size();
for (i = 0; i != e; ++i)
if (CurIndex == TiedOperands[i].first)
break;
if (i == e) {
// If not, this is some implicit operand. Just assume it is a register
// for now.
CvtOS << " Inst.addOperand(MCOperand::CreateReg(0));\n";
} else {
// Copy the tied operand.
assert(TiedOperands[i].first > TiedOperands[i].second &&
"Tied operand preceeds its target!");
CvtOS << " Inst.addOperand(Inst.getOperand("
<< TiedOperands[i].second << "));\n";
}
}
CvtOS << " ((" << TargetOperandClass << "*)Operands["
<< MIOperandList[i].second