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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/107090] [aarch64] sequence logic should be combined with mul and umulh
Date: Thu, 29 Sep 2022 21:32:35 +0000	[thread overview]
Message-ID: <bug-107090-4-G2dX1ETNEV@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-107090-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107090

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2022-09-29
          Component|middle-end                  |tree-optimization
     Ever confirmed|0                           |1
                 CC|                            |pinskia at gcc dot gnu.org
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
A few issues.
First is:

  if (_26 != 0)
    goto <bb 3>; [50.00%]
  else
    goto <bb 4>; [50.00%]

  <bb 3> [local count: 536870913]:
  ht_15 = ht_13 + 4294967296;

  <bb 4> [local count: 1073741824]:
  # ht_2 = PHI <ht_13(2), ht_15(3)>

This should be done as:
tmp_ = _26 != 0
tmp1_ = (unsigned long) tmp_
tmp2_ = tmp1_ << 32;
ht_2 = ht_13 + tmp2_;

And then there is huge pattern matching with respect to doing widening multiple
here.

  parent reply	other threads:[~2022-09-29 21:32 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-29 17:51 [Bug c/107090] New: " zhongyunde at huawei dot com
2022-09-29 17:55 ` [Bug middle-end/107090] " pinskia at gcc dot gnu.org
2022-09-29 21:32 ` pinskia at gcc dot gnu.org [this message]
2022-10-01 23:42 ` [Bug tree-optimization/107090] " zhongyunde at huawei dot com
2022-10-01 23:51 ` pinskia at gcc dot gnu.org
2022-10-07  9:44 ` zhongyunde at huawei dot com
2022-10-10  4:22 ` zhongyunde at huawei dot com
2022-10-10  4:30 ` pinskia at gcc dot gnu.org
2022-10-10  9:49 ` zhongyunde at huawei dot com
2022-10-12 13:36 ` zhongyunde at huawei dot com
2022-10-12 21:33 ` pinskia at gcc dot gnu.org
2022-10-13  2:57 ` zhongyunde at huawei dot com
2022-10-29  1:54 ` zhongyunde at huawei dot com

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