[PATCH PR81408]Turn TREE level unsafe loop optimizations warning to missed optimization message

[Richard Biener]

On Tue, Jul 18, 2017 at 11:13 AM, Bin.Cheng <amker.cheng@gmail.com> wrote:
> On Tue, Jul 18, 2017 at 9:31 AM, Richard Biener
> <richard.guenther@gmail.com> wrote:
>> On Tue, Jul 18, 2017 at 10:00 AM, Bin Cheng <Bin.Cheng@arm.com> wrote:
>>> Hi,
>>> I removed unsafe loop optimization on TREE level last year, so GCC doesn't do unsafe
>>> loop optimizations on TREE now.  All "unsafe loop optimizations" warnings reported by
>>> TREE optimizers are simply missed optimizations.  This patch turns such warning into
>>> missed optimization messages.  I didn't change when this will be dumped, for now it is
>>> when called from ivopts.
>>> Bootstrap and test on x86_64 and AArch64.  Is it OK?
>>
>> Ok but can you change the testcase to not scan the ivopts dump but use
>> -fopt-info-loop-missed?
>> You should be able to match the output with dg-message.
> Thanks for reviewing.  New patch with test case updated accordingly.  Is it OK?

Ok.

Richard.

> Thanks,
> bin
>>
>> Thanks,
>> Richard.
>>
>>> Thanks,
>>> bin
>>> 2017-07-13  Bin Cheng  <bin.cheng@arm.com>
>>>
>>>         PR target/81408
>>>         * tree-ssa-loop-niter.c (number_of_iterations_exit): Dump missed
>>>         optimization for loop niter analysis.
>>>
>>> gcc/testsuite/ChangeLog
>>> 2017-07-13  Bin Cheng  <bin.cheng@arm.com>
>>>
>>>         PR target/81408
>>>         * g++.dg/tree-ssa/pr81408.C: New.
>>>         * gcc.dg/tree-ssa/pr19210-1.c: Check dump message rather than warning.