/** Return a string rep of the operand (ie the effective address) */
public String toString() {
String addr = (base == null) ? "<0" : "<[" + base + "]";
if (index != null) {
addr += "+[" + index;
switch (scale) {
case 0:
addr += "]";
break;
case 1:
addr += "*2]";
break;
case 2:
addr += "*4]";
break;
case 3:
addr += "*8]";
break;
default:
OptimizingCompilerException.UNREACHABLE();
}
}
if (!disp.isZero()) {
addr += "+" + disp.toInt();
}
switch (size) {
case 1:
addr += ">B";
break;
case 2:
addr += ">W";
break;
case 4:
addr += ">DW";
break;
case 8:
addr += ">QW";
break;
case 16:
addr += ">PARAGRAPH";
break;
default:
OptimizingCompilerException.UNREACHABLE();
}
if (loc != null && guard != null) {
addr += " (" + loc + ", " + guard + ")";
} else if (loc != null) {
addr += " (" + loc + ")";
} else if (guard != null) {
addr += " (" + guard + ")";
}
return addr;
}
/** Is a specified condition operand 'safe' to transfer into an FCMP instruction? */
private boolean fpConditionOK(ConditionOperand c) {
// FCOMI sets ZF, PF, and CF as follows:
// Compare Results ZF PF CF
// left > right 0 0 0
// left < right 0 0 1
// left == right 1 0 0
// UNORDERED 1 1 1
switch (c.value) {
case ConditionOperand.CMPL_EQUAL:
return false; // (ZF == 1) but ordered
case ConditionOperand.CMPL_NOT_EQUAL:
return false; // (ZF == 0) but unordered
case ConditionOperand.CMPG_LESS:
return false; // (CF == 1) but ordered
case ConditionOperand.CMPG_GREATER_EQUAL:
return false; // (CF == 0) but unordered
case ConditionOperand.CMPG_LESS_EQUAL:
return false; // (CF == 1 || ZF == 1) but ordered
case ConditionOperand.CMPG_GREATER:
return false; // (CF == 0 && ZF == 0) but unordered
case ConditionOperand.CMPL_GREATER:
return true; // (CF == 0 && ZF == 0) and ordered
case ConditionOperand.CMPL_LESS_EQUAL:
return true; // (CF == 1 || ZF == 1) and unordered
case ConditionOperand.CMPL_GREATER_EQUAL:
return true; // (CF == 0) and ordered
case ConditionOperand.CMPL_LESS:
return true; // (CF == 1) and unordered
default:
OptimizingCompilerException.UNREACHABLE();
return false; // keep jikes happy
}
}
/**
* Get a constructor object for this compiler phase
*
* @return exception/null as this phase can't be created
*/
public Constructor<CompilerPhase> getClassConstructor() {
OptimizingCompilerException.UNREACHABLE();
return null;
}