public static void SetReturnStorage(ICallingConventionEmitter ccr, DataType?dtRet, int stackAlignment)
{
if (dtRet == null)
{
return;
}
int retSize = dtRet.Size;
if (retSize > 8)
{
// returns a pointer to the stack-allocated large return value
ccr.RegReturn(Registers.eax);
return;
}
else
{
var pt = dtRet.ResolveAs <PrimitiveType>();
if (pt != null && pt.Domain == Domain.Real)
{
ccr.FpuReturn(-1, PrimitiveType.Real64);
return;
}
if (retSize > 4)
{
ccr.SequenceReturn(Registers.edx, Registers.eax);
return;
}
if (retSize > 2)
{
if (stackAlignment == 4)
{
ccr.RegReturn(Registers.eax);
}
else
{
ccr.SequenceReturn(Registers.dx, Registers.ax);
}
return;
}
if (retSize > 1)
{
ccr.RegReturn(Registers.ax);
return;
}
ccr.RegReturn(Registers.al);
return;
}
}