http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30282
--- Comment #15 from Alan Modra <amodra at gmail dot com> 2011-08-05 16:23:04 UTC --- Created attachment 24922 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24922 belt and braces fix for rs6000.c This fix goes overboard to guard against possible future compiler changes. I use Jakub's frame_tie in rs6000_emit_stack_reset when frame_reg_rtx is not sp, as he found necessary (alias analysis decided fp and sp accesses couldn't alias?), just in case alias analysis further loses the plot. I also make the frame_tie mem constraint +m for sp as well as fp, to make it explicit that reads via sp or regs set from sp, shouldn't cross the stack adjust. This is definitely belts and braces stuff, but I don't believe restricts the scheduler any more than a minimal fix.
