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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/109959] `(a > 1) ? 0 : (a == 1)` is not optimized when spelled out at -O2+
Date: Wed, 07 Jun 2023 22:48:37 +0000	[thread overview]
Message-ID: <bug-109959-4-xg0s0HeeVn@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-109959-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109959

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #5)
> This is basically PR 102138 .

Except it works at -O1 because the cast is pushed out of the phi by phiopt but
the cast is the same as a & 1 here :(.

For comment #0 we could just match this for unsigned type
a_2(D) > 1 ? 0 : a_2(D) == a_2(D) <= 1 ? a_2(D) : 0 -> (unsigned)(a == 1)

For comment #3 we need to pattern match this now:
  _7 = (_Bool) a_6(D);
  _9 = a_6(D) <= 1;
  _10 = _7 & _9;

  parent reply	other threads:[~2023-06-07 22:48 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-24 22:10 [Bug tree-optimization/109959] New: `(a > 1) ? 0 : (a == 1)` is not optimized when spelled out pinskia at gcc dot gnu.org
2023-05-24 22:16 ` [Bug tree-optimization/109959] `(a > 1) ? 0 : (a == 1)` is not optimized when spelled out at -O2+ pinskia at gcc dot gnu.org
2023-05-24 22:17 ` pinskia at gcc dot gnu.org
2023-05-24 22:21 ` pinskia at gcc dot gnu.org
2023-05-25  3:39 ` pinskia at gcc dot gnu.org
2023-05-25  7:57 ` rguenth at gcc dot gnu.org
2023-06-07 22:36 ` pinskia at gcc dot gnu.org
2023-06-07 22:48 ` pinskia at gcc dot gnu.org [this message]
2023-08-06 18:19 ` pinskia at gcc dot gnu.org
2023-08-06 21:12 ` pinskia at gcc dot gnu.org
2023-08-07  0:26 ` pinskia at gcc dot gnu.org
2023-08-07  1:52 ` pinskia at gcc dot gnu.org
2023-08-07  5:09 ` pinskia at gcc dot gnu.org
2023-08-07 14:47 ` cvs-commit at gcc dot gnu.org
2023-08-07 14:48 ` pinskia at gcc dot gnu.org

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