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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/58073] Suboptimal optimisation of ((x & 0x70) == 0x00 || (x & 0x70) == 0x10 || (x & 0x70) == 0x20)
Date: Fri, 04 Jun 2021 22:32:51 +0000	[thread overview]
Message-ID: <bug-58073-4-DDeoclL8VG@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-58073-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58073

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #6)
> 
> And maybe even one like this (which will solve the issue sooner):
> 
> (bit_ior
>  (cmp (bit_and @0 INTEGER_CST@2) INTEGER_CST@3)
>  (cmp @0 INTEGER_CST@5)))

Note the final INTEGER_CST has to be 0 I think but you get the idea.

      parent reply	other threads:[~2021-06-04 22:32 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-08-03 17:01 [Bug c/58073] New: Suboptimal optimisation of ((x & 0x70) == 0x00 && (x & 0x70) == 0x10 && (x & 0x70) == 0x20) on x86_64 dhowells at redhat dot com
2013-08-03 17:06 ` [Bug c/58073] " dhowells at redhat dot com
2021-06-04 22:18 ` [Bug tree-optimization/58073] Suboptimal optimisation of ((x & 0x70) == 0x00 || (x & 0x70) == 0x10 || " pinskia at gcc dot gnu.org
2021-06-04 22:32 ` pinskia at gcc dot gnu.org [this message]

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