[Bug target/67089] [4.9/5/6 Regression] Integer overflow checks not optimized on x86/x86_64

[rth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67089

--- Comment #5 from Richard Henderson <rth at gcc dot gnu.org> ---
Author: rth
Date: Mon Nov 23 15:55:58 2015
New Revision: 230767

URL: https://gcc.gnu.org/viewcvs?rev=230767&root=gcc&view=rev
Log:
Add uaddv4_optab and usubv4_optab

        PR target/67089
        * optabs.def (uaddv4_optab, usubv4_optab): New.
        * internal-fn.c (expand_addsub_overflow): Use uaddv4_optab
        and usubv4_optab in the u +- u -> u case.
        * doc/md.texi (Standard Names): Document addv{m}4, subv{m}4,
        mulv{m}4, uaddv{m}4, usubv{m}4, umulv{m}4.

        * config/i386/i386.md (uaddv<SWI>4, usubv<SWI>4): New.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c
    trunk/gcc/config/i386/i386.md
    trunk/gcc/doc/md.texi
    trunk/gcc/internal-fn.c
    trunk/gcc/optabs.def