[Bug rtl-optimization/78378] [5/6 Regression] wrong code when combining shift + mult + zero_extend

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78378

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Dec  7 22:50:53 2016
New Revision: 243402

URL: https://gcc.gnu.org/viewcvs?rev=243402&root=gcc&view=rev
Log:
        Backported from mainline
        2016-11-16  Jakub Jelinek  <jakub@redhat.com>

        PR rtl-optimization/78378
        * combine.c (make_extraction): Use force_to_mode for non-{REG,MEM}
        inner only if pos is 0.  Fix up formatting.

        * gcc.c-torture/execute/pr78378.c: New test.

Added:
    branches/gcc-6-branch/gcc/testsuite/gcc.c-torture/execute/pr78378.c
Modified:
    branches/gcc-6-branch/gcc/ChangeLog
    branches/gcc-6-branch/gcc/combine.c
    branches/gcc-6-branch/gcc/testsuite/ChangeLog