[Bug rtl-optimization/78575] [7 Regression] ICE: in trunc_int_for_mode, at explow.c:55 with -O2 -g

["jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78575

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Dec  2 08:42:12 2016
New Revision: 243164

URL: https://gcc.gnu.org/viewcvs?rev=243164&root=gcc&view=rev
Log:
        PR rtl-optimization/78575
        * config/i386/i386.c (timode_scalar_chain::fix_debug_reg_uses): Use
        DF infrastructure to wrap all V1TImode reg uses into TImode subreg
        if not already wrapped in a subreg.  Make sure df_insn_rescan does not
        affect further iterations.

        * gcc.dg/pr78575.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr78575.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c
    trunk/gcc/testsuite/ChangeLog