Paolo Bonzini <bonz...@gnu.org> writes: > On 08/08/2009 11:59 PM, Sriraman Tallam wrote: >> Hi, >> >> Here is a patch to eliminate redundant zero-extension instructions >> on x86_64. > > The code looks nice! However, since it is very specific to x86 (and > x86 patterns), I'd rather see it in the i386 machine-dependent reorg > pass.
I don't agree with this. If we want this code to be x86_64 specific, then it should be done by having the i386 backend add the pass to the pass manager, much as plugins can add a pass. Adding stuff to md-reorg is a step backward. In any case it seems to me that this pass should run before regrename and sched2. Ian
