[Bug tree-optimization/78170] [7 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78170

--- Comment #6 from ktkachov at gcc dot gnu.org ---
Author: ktkachov
Date: Wed Nov  2 09:28:35 2016
New Revision: 241779

URL: https://gcc.gnu.org/viewcvs?rev=241779&root=gcc&view=rev
Log:
PR tree-optimization/78170: Truncate sign-extended padding when encoding
bitfields

        PR tree-optimization/78170
        * gimple-ssa-store-merging.c (encode_tree_to_bitpos): Truncate padding
        introduced by native_encode_expr on little-endian as well.

        * gcc.c-torture/execute/pr78170.c: New test.


Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr78170.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/gimple-ssa-store-merging.c
    trunk/gcc/testsuite/ChangeLog