[Bug middle-end/71700] [5 Regression] wrong code with struct assignment with sub-word signed bitfields

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71700

--- Comment #6 from ktkachov at gcc dot gnu.org ---
Author: ktkachov
Date: Thu Aug 25 09:26:15 2016
New Revision: 239754

URL: https://gcc.gnu.org/viewcvs?rev=239754&root=gcc&view=rev
Log:
[expr.c] PR middle-end/71700: zero-extend sub-word value when widening
constructor element

        Backport from mainline
        2016-07-12  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

        PR middle-end/71700
        * expr.c (store_constructor): Mask sign-extended bits when widening
        sub-word constructor element at the start of a word.

        * gcc.c-torture/execute/pr71700.c: New test.


Added:
    branches/gcc-5-branch/gcc/testsuite/gcc.c-torture/execute/pr71700.c
Modified:
    branches/gcc-5-branch/gcc/ChangeLog
    branches/gcc-5-branch/gcc/expr.c
    branches/gcc-5-branch/gcc/testsuite/ChangeLog