/**
* Translates the generic instruction <code>instruction</code> into an architecture-specific one.
* The generated instruction(s) are added to the <code>m_ilOut</code> instruction list.
*
* @param instruction The instruction to translate
*/
private void translateInstruction(Instruction instruction) {
Intrinsic intrinsic = getIntrinsicForInstruction(instruction);
if (intrinsic == null) {
LOGGER.debug(
StringUtil.concat(
"No intrinsic found for the instruction ", instruction.getInstructionName()));
m_ilOut.addInstruction(instruction);
return;
}
// get the source operands, i.e., the instruction arguments
IOperand[] rgSourceOps = instruction.getOperands();
IOperand opSourceOutput = rgSourceOps[rgSourceOps.length - 1];
// get the destination operands, i.e., the arguments of the architecture-specific intrinsic
Argument[] rgDestArgs = null;
if (intrinsic.getArguments() != null)
rgDestArgs = Arguments.parseArguments(intrinsic.getArguments());
else {
LOGGER.debug(
StringUtil.concat(
"No arguments were defined for the intrinsic ",
intrinsic.getBaseName(),
". Assuming generic arguments."));
rgDestArgs = InstructionListTranslator.createGenericArguments(rgSourceOps.length);
}
// check whether the number of arguments of the instruction and the intrinsic to be generated
// match
// the source instruction always has a result operand (the last instruction argument); in the
// intrinsic
// the result might be merged into one of the operands, so there might be one argument less
if (rgSourceOps.length != rgDestArgs.length && rgSourceOps.length - 1 != rgDestArgs.length) {
LOGGER.error(
StringUtil.concat(
"The arguments for the instruction ",
instruction.toString(),
" mapped to the intrinsic ",
intrinsic.getBaseName(),
" don't match"));
return;
}
boolean bIntrinsicHasSharedResult = rgSourceOps.length - 1 == rgDestArgs.length;
int nOutputArgDestIndex = InstructionListTranslator.getOutputArgumentIndex(rgDestArgs);
int[] rgPermSourceToDest = new int[rgSourceOps.length];
int[] rgPermDestToSource = new int[rgDestArgs.length];
InstructionListTranslator.getArgumentPermutations(
intrinsic, rgSourceOps, rgDestArgs, rgPermSourceToDest, rgPermDestToSource);
if (!bIntrinsicHasSharedResult) {
// the intrinsic to generate has a distinct output operand
// if possible, swap commutative operands if that helps saving MOVs
rgSourceOps =
InstructionListTranslator.compatibilizeCommutatives(
intrinsic,
rgSourceOps,
rgDestArgs,
rgPermSourceToDest,
rgPermDestToSource,
nOutputArgDestIndex,
bIntrinsicHasSharedResult);
} else {
// the intrinsic to generate has an operand which is used for shared input and output,
// i.e., upon completion of the instruction, the shared operand is overwritten with the result
if (opSourceOutput.equals(rgSourceOps[rgPermDestToSource[nOutputArgDestIndex]])) {
// the argument of the instruction corresponding to the shared intrinsic operand
// is the same as the instruction's result argument
} else {
if (rgSourceOps[rgSourceOps.length - 1] instanceof IOperand.IRegisterOperand) {
// if possible, swap commutative operands if that helps saving MOVs
rgSourceOps =
InstructionListTranslator.compatibilizeCommutatives(
intrinsic,
rgSourceOps,
rgDestArgs,
rgPermSourceToDest,
rgPermDestToSource,
nOutputArgDestIndex,
bIntrinsicHasSharedResult);
}
}
}
createInstructions(
instruction,
intrinsic,
rgSourceOps,
rgDestArgs,
rgPermSourceToDest,
rgPermDestToSource,
nOutputArgDestIndex,
bIntrinsicHasSharedResult);
}
/**
* Creates a copy of <code>instruction</code>. The operands are <b>not</b> deep-copied.
*
* @param instruction The instruction to copy
*/
public Instruction(Instruction instruction) {
this(instruction.getInstructionName(), instruction.getIntrinsic(), instruction.getOperands());
}
/**
* Finds the intrinsic for the instruction <code>instruction</code>.
*
* @param instruction The instruction for which to find the corresponding intrinsic.
* @return The instrinsic corresponding to the instruction <code>instruction</code>
*/
private Intrinsic getIntrinsicForInstruction(Instruction instruction) {
return m_data
.getArchitectureDescription()
.getIntrinsic(instruction.getInstructionName(), m_specDatatype);
}