[Bug tree-optimization/81388] [7/8 Regression] Incorrect code generation with -O1

[amker at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81388

--- Comment #10 from amker at gcc dot gnu.org ---
Author: amker
Date: Tue Jul 25 08:56:26 2017
New Revision: 250497

URL: https://gcc.gnu.org/viewcvs?rev=250497&root=gcc&view=rev
Log:
        Backport from 2017-07-20 trunk r250384.

        PR tree-optimization/81388
        Revert r238585:
        2016-07-21  Bin Cheng  <bin.cheng@arm.com>

        * tree-ssa-loop-niter.c (number_of_iterations_lt_to_ne): Clean up
        by removing computation of may_be_zero.

        gcc/testsuite
        PR tree-optimization/81388
        * gcc.dg/tree-ssa/pr81388-1.c: New test.
        * gcc.dg/tree-ssa/pr81388-2.c: New test.

Added:
    branches/gcc-7-branch/gcc/testsuite/gcc.dg/tree-ssa/pr81388-1.c
    branches/gcc-7-branch/gcc/testsuite/gcc.dg/tree-ssa/pr81388-2.c
Modified:
    branches/gcc-7-branch/gcc/ChangeLog
    branches/gcc-7-branch/gcc/testsuite/ChangeLog
    branches/gcc-7-branch/gcc/tree-ssa-loop-niter.c