[Bug middle-end/64491] [5 Regression] incorrect warning: loop exit may only be reached after undefined behavior

[ams at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64491

--- Comment #16 from Andrew Stubbs <ams at gcc dot gnu.org> ---
Author: ams
Date: Wed Mar 18 14:27:13 2015
New Revision: 221492

URL: https://gcc.gnu.org/viewcvs?rev=221492&root=gcc&view=rev
Log:
Fix PR64491

2015-03-18  Andrew Stubbs  <a...@codesourcery.com>

    PR middle-end/64491
    Revert:
    2014-11-20  Andrew Stubbs  <a...@codesourcery.com>

    * tree-ssa-loop-niter.c (maybe_lower_iteration_bound): Warn if a loop
    condition would be removed due to undefined behaviour.

2015-03-18  Andrew Stubbs  <a...@codesourcery.com>

    PR middle-end/64491
    Revert:
    2014-11-20  Andrew Stubbs  <a...@codesourcery.com>

    * gcc.dg/undefined-loop-1.c: New file.
    * gcc.dg/undefined-loop-2.c: New file.

    2014-12-24  Andrew Stubbs  <a...@codesourcery.com>

    PR testsuite/64032
    * gcc.dg/undefined-loop-2.c: Don't allow GCC to optimize away the
    loop exits too early.

Removed:
    trunk/gcc/testsuite/gcc.dg/undefined-loop-1.c
    trunk/gcc/testsuite/gcc.dg/undefined-loop-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-loop-niter.c