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Add operand constraints to TargetInstrInfo.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31333 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2006-11-01 00:27:05 +00:00
parent 2f15c063ba
commit e2ba897588
6 changed files with 110 additions and 16 deletions
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utils/TableGen/CodeGenTarget.cpp
+48
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@@ -273,6 +273,51 @@ bool CodeGenTarget::isLittleEndianEncoding() const {
return getInstructionSet()->getValueAsBit("isLittleEndianEncoding");
}
static std::pair<unsigned, unsigned> parseConstraint(const std::string &CStr,
CodeGenInstruction *I) {
const std::string ops("="); // FIXME: Only supports TIED_TO for now.
std::string::size_type pos = CStr.find_first_of(ops);
assert(pos != std::string::npos && "Unrecognized constraint");
std::string Name = CStr.substr(1, pos); // Skip '$'
const std::string delims(" \t");
std::string::size_type wpos = Name.find_first_of(delims);
if (wpos != std::string::npos)
Name = Name.substr(0, wpos);
unsigned FIdx = I->getOperandNamed(Name);
Name = CStr.substr(pos+1);
wpos = Name.find_first_not_of(delims);
if (wpos != std::string::npos)
Name = Name.substr(wpos+1);
unsigned TIdx = I->getOperandNamed(Name);
return std::make_pair(FIdx, (TIdx << 16) | 1);
}
static std::vector<unsigned> parseConstraints(const std::string &CStr,
CodeGenInstruction *I) {
unsigned NumOps = I->OperandList.size();
std::vector<unsigned> Res(NumOps, 0);
if (CStr == "")
return Res;
const std::string delims(",");
std::string::size_type bidx, eidx;
bidx = CStr.find_first_not_of(delims);
while (bidx != std::string::npos) {
eidx = CStr.find_first_of(delims, bidx);
if (eidx == std::string::npos)
eidx = CStr.length();
std::pair<unsigned, unsigned> C =
parseConstraint(CStr.substr(bidx, eidx), I);
Res[C.first] = C.second;
bidx = CStr.find_first_not_of(delims, eidx);
}
return Res;
}
CodeGenInstruction::CodeGenInstruction(Record *R, const std::string &AsmStr)
: TheDef(R), AsmString(AsmStr) {
Name = R->getValueAsString("Name");
@@ -338,6 +383,9 @@ CodeGenInstruction::CodeGenInstruction(Record *R, const std::string &AsmStr)
MIOperandNo, NumOps, MIOpInfo));
MIOperandNo += NumOps;
}
ConstraintStr = R->getValueAsString("Constraints");
ConstraintsList = parseConstraints(ConstraintStr, this);
}