On Feb 15, 2011, Alexandre Oliva <aol...@redhat.com> wrote: > VTA only tracks locations of gimple regs, while addressable variables > still use the old var tracking strategy. This means addressable > variables, during var-tracking, got locations that were not based on > VALUEs, which failed immediately in the presence of auto-inc addresses. > The locations also tended to degrade in other ways, when a register > holding an address happened to be overwritten at a later point.
> This patch arranges for us to track addresses of these variables as > VALUEs, and to emit new locations for them when a location whose value > was used to compute its address changes, fixing the problem. > The patch was regstrapped on x86_64-linux-gnu and i686-linux-gnu. Ok to > install? Ping? Retested on both platforms, unchanged except for fixing the typo s/deug/debug/ in the ChangeLog entry, that Jakub caught. http://gcc.gnu.org/ml/gcc-patches/2011-02/msg00981.html > for gcc/ChangeLog > from Alexandre Oliva <aol...@redhat.com> > PR deug/47624 > * var-tracking.c (add_stores): Add FIXME note. > (compute_bb_dataflow): Use value-based locations in MO_VAL_SET. > (emit_notes_in_bb): Likewise. > (check_changed_vars_4): New. > (emit_noets_for_changes): Call it. -- Alexandre Oliva, freedom fighter http://FSFLA.org/~lxoliva/ You must be the change you wish to see in the world. -- Gandhi Be Free! -- http://FSFLA.org/ FSF Latin America board member Free Software Evangelist Red Hat Brazil Compiler Engineer
