[Bug middle-end/49207] Instruction scheduling error in GCC mips cross-compiler

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49207

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
          Component|c                           |middle-end
         Resolution|---                         |INVALID

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to hanib from comment #4)
> (In reply to comment #3)
> > I think you have an aliasing problem in your code.
> 
> The code I am compiling is the Perlbench benchmark from SPEC-CPU2006. If I
> compile the code for an Intel machine using -O2 there is no problem. This
> problem only appears when I use the GCC MIPS cross-compiler with the -O2
> switch. I also traced through the code and the sequence of these two
> instructions should be reversed.

Perl in SPEC CPU 2006 has known aliasing bugs in it; just use
-fno-strict-aliasing.