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Re: fold x ^ y to 0 if x == y

From: Jeff Law <law at redhat dot com>
To: Richard Biener <rguenther at suse dot de>, Prathamesh Kulkarni <prathamesh dot kulkarni at linaro dot org>
Cc: gcc Patches <gcc-patches at gcc dot gnu dot org>, law at readhat dot com
Date: Wed, 20 Jul 2016 09:40:23 -0600
Subject: Re: fold x ^ y to 0 if x == y
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References: <CAAgBjM=iAt5QswqoKYj_TQxV4B__3kf-eYrGewQjftkuPhZVZQ@mail.gmail.com> <alpine.LSU.2.11.1607081308370.1798@t29.fhfr.qr> <alpine.LSU.2.11.1607081328510.1798@t29.fhfr.qr> <CAAgBjM=eo9gJkn2+0Sf7MzqvniptetrJqcJKfbMsxJ4+64Nrjw@mail.gmail.com> <alpine.LSU.2.11.1607201735050.30444@t29.fhfr.qr>

On 07/20/2016 09:35 AM, Richard Biener wrote:

I have reported it as PR71947.
Could you help me point out how to fix this ?


Not record both equivalences.  This might break the testcase it was
introduced for (obviously).  Which is why I CCed Jeff for his opinion.

It's on my todo list.  I'm still catching up from my PTO last month.

It'll certainly regress the testcase that was introduced when werecorded both equivalences.


jeff

References:
- fold x ^ y to 0 if x == y
  - From: Prathamesh Kulkarni
- Re: fold x ^ y to 0 if x == y
  - From: Richard Biener
- Re: fold x ^ y to 0 if x == y
  - From: Richard Biener
- Re: fold x ^ y to 0 if x == y
  - From: Prathamesh Kulkarni
- Re: fold x ^ y to 0 if x == y
  - From: Richard Biener

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