[Bug rtl-optimization/67028] combine bug. Different assumptions about subreg in different places.

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67028

--- Comment #8 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Tue Aug 18 14:27:50 2015
New Revision: 226971

URL: https://gcc.gnu.org/viewcvs?rev=226971&root=gcc&view=rev
Log:
        PR rtl-optimization/67028
        * combine.c (simplify_comparison): Fix comment.  Rearrange code.
        Add test to see if a const_int fits in the new mode.

gcc/testsuite/
        PR rtl-optimization/67028
        * gcc.dg/pr67028.c: New testcase.

Added:
    branches/gcc-4_9-branch/gcc/testsuite/gcc.dg/pr67028.c
Modified:
    branches/gcc-4_9-branch/gcc/ChangeLog
    branches/gcc-4_9-branch/gcc/combine.c
    branches/gcc-4_9-branch/gcc/testsuite/ChangeLog