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Hi Arnaud, The patch looks good. I've committed it in r133249. > > > I noticed an unexpected --- to me at least --- behaviour of the allocator. > > I have some instructions using 2 pairs of registers, say “mpra R_x, R_x+1, > R_y, R_y+1”, and setting the pairing constraints R_x -> R_x+1 and R_y -> > R_y+1 could silently produce wron...

Attached is a small patch to allow users of the PBQP allocator to optionally insert a custom pass. I believe it can be usefull to other users of the pbqp. I used it to undo some of the coalescer work, and make sure that I have different virtual registers, inserting a copy if necessary, to build a pair. I noticed an unexpected --- to me at least --- behaviour of the allocator. I have some

...Grandmaison ________________________________ From: Lang Hames [mailto:lhames at gmail.com] Sent: Friday, June 17, 2011 9:37 AM To: Arnaud Allard de Grandmaison Cc: llvmdev at cs.uiuc.edu Subject: Re: [LLVMdev] PBQP & register pairing Hi Arnaud, The patch looks good. I've committed it in r133249. I noticed an unexpected --- to me at least --- behaviour of the allocator. I have some instructions using 2 pairs of registers, say "mpra R_x, R_x+1, R_y, R_y+1", and setting the pairing constraints R_x -> R_x+1 and R_y -> R_y+1 could silently produce wrong code like "mpra %R...