------- Comment #67 from dave at hiauly1 dot hia dot nrc dot ca 2010-08-05 20:54 ------- Subject: Re: [4.6 regression] Revision 162270 failed to bootstrap
> I think initial RTL generation is fine, so it looks like my change has exposed > a latent bug. What seems to happen is that some pass between expand and > combine lengthens the lifetime of register %r25, which holds an incoming > argument, so that it now crosses another call, which clobbers it. > > This seems to happen in fwprop1, Cc Paolo. I can't find any code in that pass > which tries to handle the situation. Yes, the rtl generated by fwprop1 is wrong as r25 is clobbered by the call to pool_alloc. Dave -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44970
