[Bug rtl-optimization/57921] Alias change causes perl from SPEC 2006 to abort on MIPS

[sje at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57921

--- Comment #4 from Steve Ellcey <sje at gcc dot gnu.org> ---
Digging around on the SPEC web page led me to this:

http://www.spec.org/cpu2006/Docs/400.perlbench.html

Known portability issues

There are some known aliasing issues. The internal data structures that
represent Perl's variables are accessed in such as a way as to violate ANSI
aliasing rules. Compilation with optimizations that rely on strict compliance
to ANSI C aliasing rules will most likely produce binaries that will not
validate.