private static void EmitLdg(
EmitterContext context,
LsSize size,
int ra,
int rd,
int offset,
bool extended)
{
bool isSmallInt = size < LsSize.B32;
int count = GetVectorCount(size);
(Operand addrLow, Operand addrHigh) = Get40BitsAddress(context, new Register(ra, RegisterType.Gpr), extended, offset);
Operand bitOffset = GetBitOffset(context, addrLow);
for (int index = 0; index < count; index++)
{
Register dest = new Register(rd + index, RegisterType.Gpr);
if (dest.IsRZ)
{
break;
}
Operand value = context.LoadGlobal(context.IAdd(addrLow, Const(index * 4)), addrHigh);
if (isSmallInt)
{
value = ExtractSmallInt(context, size, bitOffset, value);
}
context.Copy(Register(dest), value);
}
}
private static int GetVectorCount(LsSize size)
{
switch (size)
{
case LsSize.B64:
return(2);
case LsSize.B128:
case LsSize.UB128:
return(4);
}
return(1);
}
private static Operand ExtractSmallInt(
EmitterContext context,
LsSize size,
Operand bitOffset,
Operand value)
{
value = context.ShiftRightU32(value, bitOffset);
switch (size)
{
case LsSize.U8: value = ZeroExtendTo32(context, value, 8); break;
case LsSize.U16: value = ZeroExtendTo32(context, value, 16); break;
case LsSize.S8: value = SignExtendTo32(context, value, 8); break;
case LsSize.S16: value = SignExtendTo32(context, value, 16); break;
}
return(value);
}
private static Operand InsertSmallInt(
EmitterContext context,
LsSize size,
Operand bitOffset,
Operand word,
Operand value)
{
switch (size)
{
case LsSize.U8:
case LsSize.S8:
value = context.BitwiseAnd(value, Const(0xff));
value = context.BitfieldInsert(word, value, bitOffset, Const(8));
break;
case LsSize.U16:
case LsSize.S16:
value = context.BitwiseAnd(value, Const(0xffff));
value = context.BitfieldInsert(word, value, bitOffset, Const(16));
break;
}
return(value);
}
