[Bug rtl-optimization/79286] [7 Regression] ira and lra wrong code at -O2 and -Os on i686-linux

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79286

--- Comment #7 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Thu Feb 16 22:56:51 2017
New Revision: 245521

URL: https://gcc.gnu.org/viewcvs?rev=245521&root=gcc&view=rev
Log:
2017-02-16  Alan Modra  <amo...@gmail.com>

        PR rtl-optimization/79286
        * ira.c (def_dominates_uses): New function.
        (update_equiv_regs): Don't create an equivalence for insns that
        may trap where the register def does not dominate the use.

        * gcc.c-torture/execute/pr79286.c: New.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr79286.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/ira.c
    trunk/gcc/testsuite/ChangeLog