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...(odd-numbered) one should be left > unallocated. If you can point me to some reference aboue "register alignment", I'll be very appreciate it. Does register alignment bring benefit? In other word, why register alignment is needed? So the word "shadow" on http://www.heyrick.co.uk/assembler/regs.html means different thing, hugh? Thanks! :-) Regards, chenwj -- Wei-Ren Chen (陳韋任) Computer Systems Lab, Institute of Information Science, Academia Sinica, Taiwan (R.O.C.) Tel:886-2-2788-3799 #1667

...R0(R1)? def RetCC_ARM_AAPCS_Common : CallingConv<[ CCIfType<[i32], CCAssignToReg<[R0, R1, R2, R3]>>, CCIfType<[i64], CCAssignToRegWithShadow<[R0, R2], [R1, R3]>> ]>; Does it mean the samething as above? I searched the web and found the link below, http://www.heyrick.co.uk/assembler/regs.html It says in some (ARM) processer modes, some register are shadowed. Does the word "shadow" mean the same thing? Thanks! Regards, chenwj -- Wei-Ren Chen (陳韋任) Computer Systems Lab, Institute of Information Science, Academia Sinica, Taiwan (R.O.C.) Tel:886-2-...

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