------- Comment #3 from pinskia at gcc dot gnu dot org 2008-08-29 05:33 -------
Oh I see the issue, it is due to the way prefetch is defined. It is defined
incorrectly. The asm does basically:
char a = *(char*)possible_NULL_POINTER;
if (!possible_NULL_POINTER)
break;
Now this is really valid for the compiler to assume (I never got this point to
Ian who did the fix for it). Anyways GCC behavior was changed back with:
2008-07-23 Ian Lance Taylor <[EMAIL PROTECTED]>
* tree-vrp.c (infer_value_range): Ignore asm statements when
looking for memory accesses for -fdelete-null-pointer-checks.
Anyways you should be using __builtin_prefetch instead.
Which was in 4.3.2.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |FIXED
Target Milestone|--- |4.3.2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37176
