On Thu, Apr 18, 2013 at 7:34 AM, Bin Cheng wrote: > Hi, > Before thumb1_reorg, ARM backend uses peephole to save comparison > instructions when a flag setting move is found before branch instruction. > Since we are using thumb1_reog now, it can be extended to catch more > opportunities by searching flag setting move instruction before branch, > rather than only the exact one before branch. > For example: > > mov r0, r1 > //other insns does not kill r0 > branch if (r0 == 0) > //other insns > > Tested on thumb1, is it OK?
Isn't this something you could use compare-elim.c for instead of a target specific pass? Ciao! Steven
