- BitsInit *BI = R->getValueAsBitsInit("Inst");
- const std::vector<RecordVal> &Vals = R->getValues();
- CodeGenInstruction &CGI = Target.getInstruction(R);
-
- // Loop over all of the fields in the instruction, determining which are the
- // operands to the instruction.
- unsigned NumberedOp = 0;
- for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
- if (!Vals[i].getPrefix() && !Vals[i].getValue()->isComplete()) {
- // Is the operand continuous? If so, we can just mask and OR it in
- // instead of doing it bit-by-bit, saving a lot in runtime cost.
- const std::string &VarName = Vals[i].getName();
- bool gotOp = false;
-
- for (int bit = BI->getNumBits()-1; bit >= 0; ) {
- int varBit = getVariableBit(VarName, BI, bit);
-
- if (varBit == -1) {
- --bit;
- } else {
- int beginInstBit = bit;
- int beginVarBit = varBit;
- int N = 1;
-
- for (--bit; bit >= 0;) {
- varBit = getVariableBit(VarName, BI, bit);
- if (varBit == -1 || varBit != (beginVarBit - N)) break;
- ++N;
- --bit;
- }
-
- if (!gotOp) {
- // If the operand matches by name, reference according to that
- // operand number. Non-matching operands are assumed to be in
- // order.
- unsigned OpIdx;
- if (CGI.Operands.hasOperandNamed(VarName, OpIdx)) {
- // Get the machine operand number for the indicated operand.
- OpIdx = CGI.Operands[OpIdx].MIOperandNo;
- assert (!CGI.Operands.isFlatOperandNotEmitted(OpIdx) &&
- "Explicitly used operand also marked as not emitted!");
- } else {
- /// If this operand is not supposed to be emitted by the
- /// generated emitter, skip it.
- while (CGI.Operands.isFlatOperandNotEmitted(NumberedOp))
- ++NumberedOp;
- OpIdx = NumberedOp++;
- }
- std::pair<unsigned, unsigned> SO =
- CGI.Operands.getSubOperandNumber(OpIdx);
- std::string &EncoderMethodName =
- CGI.Operands[SO.first].EncoderMethodName;
-
- // If the source operand has a custom encoder, use it. This will
- // get the encoding for all of the suboperands.
- if (!EncoderMethodName.empty()) {
- // A custom encoder has all of the information for the
- // sub-operands, if there are more than one, so only
- // query the encoder once per source operand.
- if (SO.second == 0) {
- Case += " // op: " + VarName + "\n"
- + " op = " + EncoderMethodName + "(MI, "
- + utostr(OpIdx) + ");\n";
- }
- } else {
- Case += " // op: " + VarName + "\n"
- + " op = getMachineOpValue(MI, MI.getOperand("
- + utostr(OpIdx) + "));\n";
- }
- gotOp = true;
- }
-
- unsigned opMask = ~0U >> (32-N);
- int opShift = beginVarBit - N + 1;
- opMask <<= opShift;
- opShift = beginInstBit - beginVarBit;
-
- if (opShift > 0) {
- Case += " Value |= (op & " + utostr(opMask) + "U) << "
- + itostr(opShift) + ";\n";
- } else if (opShift < 0) {
- Case += " Value |= (op & " + utostr(opMask) + "U) >> "
- + itostr(-opShift) + ";\n";
- } else {
- Case += " Value |= op & " + utostr(opMask) + "U;\n";
- }
- }
- }
- }
- }
-
- std::vector<std::string> &InstList = CaseMap[Case];
- InstList.push_back(InstName);