[Bug middle-end/34400] [4.3 regression] bad interaction between DF and SJLJ exceptions

["seongbae dot park at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #51 from seongbae dot park at gmail dot com  2008-01-17 21:31 -------
Subject: Re:  [4.3 regression] bad interaction between DF and SJLJ exceptions

In df_live_transfer_function:

Doesn't look like we need df_live_scratch - can't we do:

bitmap_and (out, gen, bb_lr_info->out);
bitmap_and_into (in, bb_lr_info->in);
return bitmap_ior_and_compl_into (out, in, kill);

?

Seongbae

On Jan 17, 2008 1:05 PM, Kenneth Zadeck <zadeck@naturalbridge.com> wrote:
> This is the second of three patches to fix 34400.  This patch also makes
> some progress on 26854 but more work is required that is not going to be
> done in 4.3 to fix the problems here.
>
> This patch uses the output of the df_lr problem to make the df_live
> problem converge faster.
> This not only saves time but also space since the size of the df_live
> bitmaps never grows and the space of our bitmaps is proportional to the
> number of 1 bits.
>
> This has been tested on several platforms and along with the patch just
> committed cuts the time on the 34400 problems significantly.  I believe
> that this patch also has some modest improvement on bootstrap time, i.e
> regular programs.
>
> The change to df_live_reset is a slightly related latent bug fix.
>
> Ok to commit?
>
> Kenny
>
>
> 2008-01-17  Kenneth Zadeck  <zadeck@naturalbridge.com>
>         Steven Bosscher  <stevenb.gcc@gmail.com>
>
>     PR rtl-optimization/26854
>     PR rtl-optimization/34400
>     * df-problems.c (df_live_scratch): New scratch bitmap.
>     (df_live_alloc): Allocate df_live_scratch when doing df_live.
>     (df_live_reset): Clear the proper bitmaps.
>     (df_live_bb_local_compute): Only process the artificial defs once
>     since the order is not important.
>     (df_live_init): Init the df_live sets only with the variables
>     found live by df_lr.
>     (df_live_transfer_function): Use the df_lr sets to prune the
>     df_live sets as they are being computed.
>     (df_live_free): Free df_live_scratch.
>
>


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34400