On Nov 8, 2013, at 2:30 AM, Richard Sandiford <rdsandif...@googlemail.com>
wrote:
> From gcse.c:
>
> --- wide-int-base/gcc/gcc/gcse.c 2013-11-05 13:09:32.148376180 +0000
> +++ wide-int/gcc/gcc/gcse.c 2013-11-05 13:07:28.431495118 +0000
> @@ -1997,6 +1997,13 @@ prune_insertions_deletions (int n_elems)
> bitmap_clear_bit (pre_delete_map[i], j);
> }
>
> + if (dump_file)
> + {
> + dump_bitmap_vector (dump_file, "pre_insert_map", "", pre_insert_map,
> n_edges);
> + dump_bitmap_vector (dump_file, "pre_delete_map", "", pre_delete_map,
> + last_basic_block);
> + }
> +
> sbitmap_free (prune_exprs);
> free (insertions);
> free (deletions);
>
> This doesn't look related.
I think this was so Kenny could find code-gen differences and pin point them
faster by having the ability to compare dump files. When we developed the
branch, we found great utility in dump file comparisons. It narrows down the
scope of what went wrong and helps get you into the right data structures to
look at. Sometimes one can have identical code-gen, but, have different dump
files, and comparing them and looking for differences was nice.
