private static Operand FindDefOnPred(DefMap[] globalDefs, BasicBlock current, Operand operand)
{
BasicBlock previous;
do
{
DefMap defMap = globalDefs[current.Index];
Register reg = operand.GetRegister();
if (defMap.TryGetOperand(reg, out Operand lastDef))
{
return(lastDef);
}
if (defMap.HasPhi(reg))
{
return(InsertPhi(globalDefs, current, operand));
}
previous = current;
current = current.ImmediateDominator;
}while (previous != current);
return(Undef());
}
private static Definition FindDefinition(DefMap[] globalDefs, BasicBlock current, Register reg)
{
foreach (BasicBlock block in SelfAndImmediateDominators(current))
{
DefMap defMap = globalDefs[block.Index];
if (defMap.TryGetOperand(reg, out Operand lastDef))
{
return(new Definition(block, lastDef));
}
if (defMap.HasPhi(reg))
{
return(new Definition(block, InsertPhi(globalDefs, block, reg)));
}
}
return(new Definition(current, Undef()));
}
