[Bug rtl-optimization/78241] [7 Regression] wrong code with -funroll-loops

[pthaugen at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78241

--- Comment #3 from Pat Haugen <pthaugen at gcc dot gnu.org> ---
Author: pthaugen
Date: Thu Nov 10 18:55:57 2016
New Revision: 242047

URL: https://gcc.gnu.org/viewcvs?rev=242047&root=gcc&view=rev
Log:
        PR rtl-optimization/78241
        * loop-unroll.c (unroll_loop_runtime_iterations): Don't adjust 'niter',
but
        emit initial peel copy if niter expr is not reliable.

        * gcc.dg/pr78241.c: New test.


Added:
    trunk/gcc/testsuite/gcc.dg/pr78241.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/loop-unroll.c
    trunk/gcc/testsuite/ChangeLog