[Bug optimization/12092] ICE: Floating point exception

["pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12092


pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2003-08-28 13:00:55         |2003-08-29 16:30:24
               date|                            |


------- Additional Comments From pinskia at gcc dot gnu dot org  2003-08-29 16:30 -------
Something here is causing it:
>From loop.c:
4030          /* Prefetch might be worthwhile only when the loads/stores are dense.  */
4031          if (PREFETCH_ONLY_DENSE_MEM)
4032            if (density * 256 > PREFETCH_DENSE_MEM * 100
4033                && (info[i].total_bytes / PREFETCH_BLOCK                        <--- I want to say 
this guy is causing it
4034                    >= PREFETCH_BLOCKS_BEFORE_LOOP_MIN))

And it is PREFETCH_BLOCK is defined as ix86_cost->prefetch_block which is zero at 
this point because we are tuning for i486 (which does not have prefetch at all) but our 
arch is pentium4 which does have prefetch so we try to use prefetch but we need to 
figure out if it is good to prefetch so we do a divide on PREFETCH_BLOCK but since 
PREFETCH_BLOCK is zero here, we get an floating exception.