search for: ccassigntoxxxwithshadow

Hi, Anton > On Win64 general purpose registers shadow xmm and vice versa, so, say, > if you put argument into ecx, the xmm0 is marked as already occupied, > if you put argument into xmm1, edx is marked as occupied, etc. I think ecx and xmm0 are physical different registers (not like ecx and cx), right? So why we cannot use xmm0 while ecx has been used? Is it just a rule or there are

Hello >  I don't know when we should use CCAssignToRegWithShadow. Because > I am not a architecture expert, please bear with my naive question. > Take ARMCallingConv.td as an example, ARM is not good example :) Look into win64 calling convention. Shadow means if some register is allocated for incoming argument another one cannot be used for argument allocation. On Win64 general

Hi, all On the website, it says, CCAssignToRegWithShadow <registerList, shadowList> — similar to CCAssignToReg, but with a shadow list of registers I don't know when we should use CCAssignToRegWithShadow. Because I am not a architecture expert, please bear with my naive question. Take ARMCallingConv.td as an example, CCIfType<[i32], CCIfAlign<"8",