------- Comment #8 from hjl dot tools at gmail dot com 2008-10-04 01:33 -------
(In reply to comment #7)
> This regression was introduced between 2005-03-11 and 2005-03-13.
> This patch:
>
> http://gcc.gnu.org/ml/gcc-patches/2005-03/msg01296.html
>
> may be the cause.
>
It is the cause. This patch seems to work:
Index: expmed.c
===================================================================
--- expmed.c (revision 140780)
+++ expmed.c (working copy)
@@ -3092,7 +3092,7 @@
produce a smaller program when -O is not used. But this causes
such a terrible slowdown sometimes that it seems better to always
use synth_mult. */
- if (coeff != 0)
+ if (coeff > 0 || (coeff != 0 && !unsignedp))
{
/* Special case powers of two. */
if (EXACT_POWER_OF_2_OR_ZERO_P (coeff))
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37731
