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On Aug 31, 2010, at 1:06 PM, Borja Ferrer wrote: > Incase i wasnt clear enough i'll expose a simple example using the common known x86 arch. > AX is composed by AL and AH (AX and AH are subregs of AX), now assume x86 can only add regs of 8 bits, so if a i16 number is stored in AX it should get splitted into AL and AH so that the 8 bit addition pattern is matched. > > If this is

...h their widest regs, but my case is different because im working with register pairs and machine instructions can only work with the pair parts. Thanks. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20100901/e435dfff/attachment.html>

Hello Jeff, you're the first one to reply to my question :) I got a bit confused with the fact you said that the subregister class is larger than the superregister class. As far as i understood or what i tried to do with my code is to define a register pair composed of two 8 bit registers the way i described in my previous message. So R1R0 in WDREGS is directly mapped into R0 and R1 of GPR8.