[Bug middle-end/70593] [6 Regression] Miscompilation of xen starting with r226901

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70593

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Apr  8 17:28:20 2016
New Revision: 234834

URL: https://gcc.gnu.org/viewcvs?rev=234834&root=gcc&view=rev
Log:
        PR middle-end/70593
        * tree-ssa-coalesce.c (build_ssa_conflict_graph): For stmt
        with multiple SSA_NAME defs, force the outputs other than first
        to be live before calling live_track_process_def on each output.

        * gcc.target/i386/pr70593.c: New test.

Added:
    trunk/gcc/testsuite/gcc.target/i386/pr70593.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-coalesce.c