> 2012-11-05 Uros Bizjak <ubiz...@gmail.com>
> Kaz Kojima <kkoj...@gcc.gnu.org>
>
> PR target/41993
> * mode-switching.c (create_pre_exit): Set return_copy to
> last_insn when copy_start is a pseudo reg.
OK, thanks. The number of special cases dealt with in the function is on the
verge of making it barely understandable though. Why couldn't a backward scan
based only on:
/* If the return register is not likely spilled, - as is
the case for floating point on SH4 - then it might
be set by an arithmetic operation that needs a
different mode than the exit block. */
for (j = n_entities - 1; j >= 0; j--)
{
int e = entity_map[j];
int mode = MODE_NEEDED (e, return_copy);
if (mode != num_modes[e] && mode != MODE_EXIT (e))
break;
}
(with a few shortcuts to speed it up) be sufficient?
--
Eric Botcazou
