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From: Richard Biener <richard.guenther@gmail.com>
Date: Mon, 25 Jun 2018 10:02:00 -0000
Message-ID: <CAFiYyc3jY5BFzR4WuQfJ-uWeOGHkfg02tSt1FgbrmNOVJ=MY_A@mail.gmail.com>
Subject: Re: [PATCH 2/3][POPCOUNT] Check if zero check is done before entering the loop
To: Kugan Vivekanandarajah <kugan.vivekanandarajah@linaro.org>
Cc: GCC Patches <gcc-patches@gcc.gnu.org>
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On Fri, Jun 22, 2018 at 11:14 AM Kugan Vivekanandarajah
<kugan.vivekanandarajah@linaro.org> wrote:
>
> gcc/ChangeLog:

The canonical way is calling simplify_using_initial_conditions on the
may_be_zero condition.

Richard.

> 2018-06-22  Kugan Vivekanandarajah  <kuganv@linaro.org>
>
>     * tree-ssa-loop-niter.c (number_of_iterations_popcount): If popcount
>     argument is checked for zero before entering loop, avoid checking again.