[Bug rtl-optimization/82192] [5/6/7/8 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 #17 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Sep 15 15:54:04 2017
New Revision: 252824

URL: https://gcc.gnu.org/viewcvs?rev=252824&root=gcc&view=rev
Log:
        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:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr82192.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/combine.c
    trunk/gcc/testsuite/ChangeLog