On Wed, 23 May 2012, H.J. Lu wrote: > On Wed, May 23, 2012 at 5:00 AM, Richard Guenther <rguent...@suse.de> wrote: > > > > This finally switches us to not record global vars in referenced-vars. > > For this to work I had to re-engineer how we handle global var removal > > from local-decls in remove_unused_locals. Incidentially that code > > already had some sort of a bitmap (for some weird reason even), thus > > I borrowed that and simplified the handling. You may notice that > > it would be easy to handle all vars that way ... > > > > So eventually 5/n will make referenced-vars go away completely > > (the only serious user seems to be the SSA renamer for its > > SYMS_TO_RENAME bitmap). > > > > Bootstrapped on x86_64-unknown-linux-gnu, testing in progress. > > > > Richard. > > > > 2012-05-23 Richard Guenther <rguent...@suse.de> > > > > * tree-dfa.c (add_referenced_var_1): Do not add global vars. > > * tree-ssa-live.c (mark_all_vars_used_1): Handle global vars > > via the global_unused_vars bitmap. > > (remove_unused_locals): Handle global vars in local-decls via > > a global_unused_vars bitmap instead of the used flag in the > > var annotation. Simplify global variable handling and removal. > > > > This breaks bootstrap on Linux/x86-64: > > http://gcc.gnu.org/ml/gcc-regression/2012-05/msg00468.html > > Comparing stages 2 and 3 > warning: gcc/cc1plus-checksum.o differs > warning: gcc/cc1obj-checksum.o differs > warning: gcc/cc1-checksum.o differs > Bootstrap comparison failure! > gcc/trans-mem.o differs > gcc/gimple-low.o differs > gcc/sese.o differs > make[5]: *** [compare] Error 1 > > Please make sure that your compiler used for bootstrap > doesn't add anything to .comment section, which will > disable debug compare.
Well, I can't. Why is debug compare so fragile? Now trying to find a way to reproduce (I can't see why it should cause this ...) Richard.
