[Bug tree-optimization/87415] [9 Regression] wrong code at -O1 and above on x86_64-linux-gnu

[aldyh at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87415

--- Comment #5 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Author: aldyh
Date: Wed Oct  3 17:36:29 2018
New Revision: 264817

URL: https://gcc.gnu.org/viewcvs?rev=264817&root=gcc&view=rev
Log:
        PR tree-optimization/87415
        * tree-vrp.c (set_value_range_with_overflow): Special case one bit
        precision fields.

Added:
    trunk/gcc/testsuite/gcc.dg/pr87415.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-vrp.c