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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/114660] Exponentiating by squaring not performed for x * y * y * y * y
Date: Tue, 09 Apr 2024 18:22:57 +0000	[thread overview]
Message-ID: <bug-114660-4-KKOe5ukJgR@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-114660-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114660

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I think we've been discussing an idea of turning on flag_wrapv very late among
the GIMPLE passes and reassociate again.  Because RTL also kind of assumes
flag_wrapv, there is no difference between signed/unsigned
addition/subtraction/non-widening multiplication.
Though, a question is if it wouldn't screw up range info for use during
expansion too much.  Other option is to rewrite into unsigned operations only
what we've successfully reassociated in the late reassoc pass.

  parent reply	other threads:[~2024-04-09 18:22 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-04-09 15:45 [Bug middle-end/114660] New: " antoshkka at gmail dot com
2024-04-09 15:48 ` [Bug middle-end/114660] " antoshkka at gmail dot com
2024-04-09 18:01 ` [Bug tree-optimization/114660] " pinskia at gcc dot gnu.org
2024-04-09 18:07 ` pinskia at gcc dot gnu.org
2024-04-09 18:22 ` jakub at gcc dot gnu.org [this message]
2024-04-10  6:28 ` rguenth at gcc dot gnu.org

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