[Bug middle-end/78540] [6/7 Regression] ICE: in df_refs_verify, at df-scan.c:4062 with -O -march=core2

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78540

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Nov 28 22:51:29 2016
New Revision: 242937

URL: https://gcc.gnu.org/viewcvs?rev=242937&root=gcc&view=rev
Log:
        PR middle-end/78540
        * rtl.h (remove_reg_equal_equiv_notes): Return bool instead of void.
        * rtlanal.c (remove_reg_equal_equiv_notes): Return true if any
        note has been removed.
        * postreload.c (reload_combine_recognize_pattern): If
        remove_reg_equal_equiv_notes returns true, call df_notes_rescan.

        * gcc.dg/pr78540.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr78540.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/postreload.c
    trunk/gcc/rtl.h
    trunk/gcc/rtlanal.c
    trunk/gcc/testsuite/ChangeLog