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Enhance the fixed-length decoder emitter to support tied operands.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136431 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2011-07-28 23:56:20 +00:00
parent 3678537332
commit 00ef6e3a30
1 changed files with 13 additions and 1 deletions
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14
utils/TableGen/FixedLenDecoderEmitter.cpp
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@ -1223,6 +1223,17 @@ static bool populateInstruction(const CodeGenInstruction &CGI,
for (unsigned i = 0; i < In->getNumArgs(); ++i)
InOutOperands.push_back(std::make_pair(In->getArg(i), In->getArgName(i)));
// Search for tied operands, so that we can correctly instantiate
// operands that are not explicitly represented in the encoding.
std::map<Init*, std::string> TiedNames;
for (unsigned i = 0; i < CGI.Operands.size(); ++i) {
int tiedTo = CGI.Operands[i].getTiedRegister();
if (tiedTo != -1) {
TiedNames[InOutOperands[i].first] = InOutOperands[tiedTo].second;
TiedNames[InOutOperands[tiedTo].first] = InOutOperands[i].second;
}
}
// For each operand, see if we can figure out where it is encoded.
for (std::vector<std::pair<Init*, std::string> >::iterator
NI = InOutOperands.begin(), NE = InOutOperands.end(); NI != NE; ++NI) {
@ -1269,7 +1280,8 @@ static bool populateInstruction(const CodeGenInstruction &CGI,
VarInit *Var = dynamic_cast<VarInit*>(BI->getVariable());
assert(Var);
if (Var->getName() != NI->second) {
if (Var->getName() != NI->second &&
Var->getName() != TiedNames[NI->first]) {
if (Base != ~0U) {
OpInfo.addField(Base, Width, Offset);
Base = ~0U;