[Bug rtl-optimization/82192] [6/7 Regression] gcc produces incorrect code with -O2 and bit-field

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82192

--- Comment #21 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Jun 25 16:45:10 2018
New Revision: 262028

URL: https://gcc.gnu.org/viewcvs?rev=262028&root=gcc&view=rev
Log:
        Backported from mainline
        2017-09-15  Jakub Jelinek  <jakub@redhat.com>

        PR rtl-optimization/82192
        * combine.c (make_extraction): Don't look through non-paradoxical
        SUBREGs or TRUNCATE if pos + len is or might be bigger than
        inner's mode.

        * gcc.c-torture/execute/pr82192.c: New test.

Added:
    branches/gcc-6-branch/gcc/testsuite/gcc.c-torture/execute/pr82192.c
Modified:
    branches/gcc-6-branch/gcc/ChangeLog
    branches/gcc-6-branch/gcc/combine.c
    branches/gcc-6-branch/gcc/testsuite/ChangeLog