x86GRegLocation AllocGRegHelper(int Size, bool OneByteVariant,
x86GRegisterList CantBe = new x86GRegisterList(), bool EnableParamLocs = false)
{
if (Size == 1)
{
OneByteVariant = false;
}
var Mask = new x86RegisterMask(Size);
var HighMask = new x86RegisterMask(1, 1);
var Sequence = x86CallConv.AllocationSequence.GRegisters;
for (var i = 0; i < Sequence.Length; i++)
{
var Reg = Sequence[i];
if (Arch.IsGRegisterExists(Reg, Mask) && IsGRegisterFree(Reg, Mask, EnableParamLocs))
{
if (CantBe.Initialized && !CantBe.IsFree(Reg, Mask))
{
continue;
}
if (OneByteVariant && !Arch.IsGRegisterExists(Reg, 0, 1))
{
continue;
}
GRegisters.SetUsed(Reg, Mask);
return(new x86GRegLocation(Arch, Reg, Mask));
}
if (Size == 1 && Arch.IsGRegisterExists(Reg, HighMask) &&
IsGRegisterFree(Reg, HighMask, EnableParamLocs))
{
if (CantBe.Initialized && !CantBe.IsFree(Reg, HighMask))
{
continue;
}
GRegisters.SetUsed(Reg, HighMask);
return(new x86GRegLocation(Arch, Reg, HighMask));
}
}
return(null);
}
