[PR44181] skip debug insns when inserting IV updates

[H.J. Lu]

On Fri, Jun 11, 2010 at 12:18 PM, Alexandre Oliva <aoliva@redhat.com> wrote:
> A number of graphite -fcompare-debug bug reports were fixed with this
> patch.  The problem was that we inserted induction variable increment
> stmts before the last stmt in the block, but if the block ended with a
> fall-through, the insert would be before a non-debug stmt in the non-VTA
> case, whereas in the VTA case it could be before a debug stmt, after the
> non-debug stmt.  Skipping trailing debug stmts so that we insert before
> the last non-debug stmt removed the codegen differences.
>
> Bootstrapped the compiler, along with the upcoming patch for PR43656, on
> x86_64-linux-gnu, with the following options:
>
> -O2 -g -fschedule-insns -fsched-pressure -funroll-loops -fgraphite-identity
>
> for stage2 and stage3 host, and for stage3 libs (also -fcompare-debug)
>
> I got build failures on zlib and libada, presumably because of this
> unusual combination of flags, but no -fcompare-debug errors.
>

This caused:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46885

-- 
H.J.