On Thu, May 24, 2012 at 12:12 AM, Richard Guenther <rguent...@suse.de> wrote: > 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 ...) >
I opened: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53472 -- H.J.
