[Bug rtl-optimization/38644] Optimization flag -O1 -fschedule-insns2 causes wrong code

[rearnsha at gcc dot gnu dot org]

------- Comment #5 from rearnsha at gcc dot gnu dot org  2009-12-22 11:16 -------
IMO this is a generic bug in the scheduler.  The code in sched-deps.c should
note that STACK_POINTER_RTX is being changed and insert a memory barrier that
prevents migration of stack-related memory accesses across the change.

Of course, determining what memory accesses are stack-related is quite hard,
and it may be that all memory accesses in the same address space as the stack
will need to be restricted.


-- 

rearnsha at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|target                      |rtl-optimization
   Last reconfirmed|2009-03-17 00:03:45         |2009-12-22 11:16:40
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38644