[Bug middle-end/71700] [4.9/5/6/7 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 #2 from ktkachov at gcc dot gnu.org ---
Author: ktkachov
Date: Tue Jul 12 15:00:28 2016
New Revision: 238248

URL: https://gcc.gnu.org/viewcvs?rev=238248&root=gcc&view=rev
Log:
[expr.c] PR middle-end/71700: zero-extend sub-word value when widening
constructor element

        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:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr71700.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/expr.c
    trunk/gcc/testsuite/ChangeLog