On Wed, May 23, 2012 at 7:25 AM, H.J. Lu <hjl.to...@gmail.com> 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.
I opened: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53466 -- H.J.
