On 11/21/2011 05:31 PM, Jiangning Liu wrote: > My question is essentially is "May I really use REG_EXPR in back-end code?" > like the patch I gave below?
I suppose. Another alternative is to use BImode for booleans. Dunno how much of that you'd be able to gleen from mere rtl expansion or if you'd need boolean decls to be expanded with BImode. The later would probably need a target hook. I've often wondered how much ia64 would benefit from that too, being able to store bool variables directly in predicate registers. All of this almost certainly must wait until stage1 opens up again though... r~
