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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/95408] Failure to optimize bitwise and with negated conditional using the same operand to conditional with decremented operand
Date: Wed, 23 Aug 2023 02:36:27 +0000	[thread overview]
Message-ID: <bug-95408-4-9U4LtMklXP@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-95408-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95408

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
In forwprop1 we have:
  _2 = x.0_1 <= 121210;
  _3 = (int) _2;
  _4 = _3 * x_5(D);
  _6 = _4 != 0;

since _3 is zero_one_valued we could do instead:
```
(for cmp   (ne      eq     )
     bitop (bit_and bit_ior)
 (simplify
  (cmp (mult zero_one_valued_p@0 @1) integer_zerop@2)
  (bitop! (convert @0) (ne @1 @2))))
```
And we should be able to get it earlier on.

Still mine and I will look into the above.

  parent reply	other threads:[~2023-08-23  2:36 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-29  9:40 [Bug tree-optimization/95408] New: " gabravier at gmail dot com
2021-04-26  1:15 ` [Bug tree-optimization/95408] " pinskia at gcc dot gnu.org
2023-05-13  5:47 ` pinskia at gcc dot gnu.org
2023-08-23  2:36 ` pinskia at gcc dot gnu.org [this message]
2023-09-16  6:25 ` pinskia at gcc dot gnu.org

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