mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-02-20 14:29:27 +00:00
reduce nesting and minor cleanups, no functionality change.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119128 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
parent
85cf7d737d
commit
98e969ae20
@ -62,13 +62,10 @@ void CodeEmitterGen::reverseBits(std::vector<Record*> &Insts) {
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// return the variable bit position. Otherwise return -1.
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int CodeEmitterGen::getVariableBit(const std::string &VarName,
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BitsInit *BI, int bit) {
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if (VarBitInit *VBI = dynamic_cast<VarBitInit*>(BI->getBit(bit))) {
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TypedInit *TI = VBI->getVariable();
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if (VarInit *VI = dynamic_cast<VarInit*>(TI)) {
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if (VI->getName() == VarName) return VBI->getBitNum();
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}
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}
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if (VarBitInit *VBI = dynamic_cast<VarBitInit*>(BI->getBit(bit)))
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if (VarInit *VI = dynamic_cast<VarInit*>(VBI->getVariable()))
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if (VI->getName() == VarName)
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return VBI->getBitNum();
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return -1;
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}
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@ -141,91 +138,95 @@ void CodeEmitterGen::run(raw_ostream &o) {
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// operands to the instruction.
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unsigned NumberedOp = 0;
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for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
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if (!Vals[i].getPrefix() && !Vals[i].getValue()->isComplete()) {
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// Is the operand continuous? If so, we can just mask and OR it in
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// instead of doing it bit-by-bit, saving a lot in runtime cost.
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const std::string &VarName = Vals[i].getName();
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bool gotOp = false;
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// Ignore fixed fields.
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if (Vals[i].getPrefix() || Vals[i].getValue()->isComplete())
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continue;
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// Is the operand continuous? If so, we can just mask and OR it in
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// instead of doing it bit-by-bit, saving a lot in runtime cost.
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const std::string &VarName = Vals[i].getName();
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bool gotOp = false;
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for (int bit = BI->getNumBits()-1; bit >= 0; ) {
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int varBit = getVariableBit(VarName, BI, bit);
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for (int bit = BI->getNumBits()-1; bit >= 0; ) {
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int varBit = getVariableBit(VarName, BI, bit);
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if (varBit == -1) {
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--bit;
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// If this bit isn't from a variable, skip it.
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if (varBit == -1) {
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--bit;
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continue;
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}
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int beginInstBit = bit;
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int beginVarBit = varBit;
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int N = 1;
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for (--bit; bit >= 0;) {
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varBit = getVariableBit(VarName, BI, bit);
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if (varBit == -1 || varBit != (beginVarBit - N)) break;
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++N;
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--bit;
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}
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if (!gotOp) {
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// If the operand matches by name, reference according to that
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// operand number. Non-matching operands are assumed to be in
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// order.
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unsigned OpIdx;
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if (CGI.Operands.hasOperandNamed(VarName, OpIdx)) {
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// Get the machine operand number for the indicated operand.
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OpIdx = CGI.Operands[OpIdx].MIOperandNo;
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assert (!CGI.Operands.isFlatOperandNotEmitted(OpIdx) &&
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"Explicitly used operand also marked as not emitted!");
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} else {
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int beginInstBit = bit;
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int beginVarBit = varBit;
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int N = 1;
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for (--bit; bit >= 0;) {
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varBit = getVariableBit(VarName, BI, bit);
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if (varBit == -1 || varBit != (beginVarBit - N)) break;
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++N;
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--bit;
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}
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if (!gotOp) {
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// If the operand matches by name, reference according to that
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// operand number. Non-matching operands are assumed to be in
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// order.
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unsigned OpIdx;
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if (CGI.Operands.hasOperandNamed(VarName, OpIdx)) {
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// Get the machine operand number for the indicated operand.
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OpIdx = CGI.Operands[OpIdx].MIOperandNo;
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assert (!CGI.Operands.isFlatOperandNotEmitted(OpIdx) &&
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"Explicitly used operand also marked as not emitted!");
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} else {
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/// If this operand is not supposed to be emitted by the
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/// generated emitter, skip it.
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while (CGI.Operands.isFlatOperandNotEmitted(NumberedOp))
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++NumberedOp;
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OpIdx = NumberedOp++;
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}
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std::pair<unsigned, unsigned> SO =
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CGI.Operands.getSubOperandNumber(OpIdx);
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std::string &EncoderMethodName =
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CGI.Operands[SO.first].EncoderMethodName;
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// If the source operand has a custom encoder, use it. This will
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// get the encoding for all of the suboperands.
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if (!EncoderMethodName.empty()) {
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// A custom encoder has all of the information for the
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// sub-operands, if there are more than one, so only
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// query the encoder once per source operand.
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if (SO.second == 0) {
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Case += " // op: " + VarName + "\n"
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+ " op = " + EncoderMethodName + "(MI, "
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+ utostr(OpIdx);
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if (MCEmitter)
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Case += ", Fixups";
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Case += ");\n";
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}
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} else {
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Case += " // op: " + VarName + "\n"
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+ " op = getMachineOpValue(MI, MI.getOperand("
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+ utostr(OpIdx) + ")";
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if (MCEmitter)
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Case += ", Fixups";
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Case += ");\n";
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}
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gotOp = true;
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}
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unsigned opMask = ~0U >> (32-N);
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int opShift = beginVarBit - N + 1;
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opMask <<= opShift;
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opShift = beginInstBit - beginVarBit;
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if (opShift > 0) {
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Case += " Value |= (op & " + utostr(opMask) + "U) << "
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+ itostr(opShift) + ";\n";
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} else if (opShift < 0) {
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Case += " Value |= (op & " + utostr(opMask) + "U) >> "
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+ itostr(-opShift) + ";\n";
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} else {
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Case += " Value |= op & " + utostr(opMask) + "U;\n";
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}
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/// If this operand is not supposed to be emitted by the
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/// generated emitter, skip it.
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while (CGI.Operands.isFlatOperandNotEmitted(NumberedOp))
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++NumberedOp;
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OpIdx = NumberedOp++;
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}
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std::pair<unsigned, unsigned> SO =
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CGI.Operands.getSubOperandNumber(OpIdx);
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std::string &EncoderMethodName =
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CGI.Operands[SO.first].EncoderMethodName;
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// If the source operand has a custom encoder, use it. This will
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// get the encoding for all of the suboperands.
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if (!EncoderMethodName.empty()) {
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// A custom encoder has all of the information for the
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// sub-operands, if there are more than one, so only
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// query the encoder once per source operand.
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if (SO.second == 0) {
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Case += " // op: " + VarName + "\n"
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+ " op = " + EncoderMethodName + "(MI, "
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+ utostr(OpIdx);
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if (MCEmitter)
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Case += ", Fixups";
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Case += ");\n";
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}
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} else {
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Case += " // op: " + VarName + "\n"
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+ " op = getMachineOpValue(MI, MI.getOperand("
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+ utostr(OpIdx) + ")";
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if (MCEmitter)
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Case += ", Fixups";
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Case += ");\n";
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}
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gotOp = true;
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}
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unsigned opMask = ~0U >> (32-N);
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int opShift = beginVarBit - N + 1;
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opMask <<= opShift;
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opShift = beginInstBit - beginVarBit;
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if (opShift > 0) {
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Case += " Value |= (op & " + utostr(opMask) + "U) << "
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+ itostr(opShift) + ";\n";
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} else if (opShift < 0) {
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Case += " Value |= (op & " + utostr(opMask) + "U) >> "
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+ itostr(-opShift) + ";\n";
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} else {
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Case += " Value |= op & " + utostr(opMask) + "U;\n";
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}
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}
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}
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