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From: "pan2.li at intel dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/51492] vectorizer does not support saturated
 arithmetic patterns
Date: Tue, 06 Feb 2024 01:13:57 +0000
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X-Bugzilla-Component: tree-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D51492

--- Comment #16 from Li Pan <pan2.li at intel dot com> ---
I have a try like below and finally have the Standard Name "SAT_ADD". Could=
 you
please help to double-check if my understanding is correct?

Given below example code below:

typedef unsigned int uint32_t;

uint32_t
sat_add (uint32_t x, uint32_t y)
{
  return (x + y) | - ((x + y) < x);
}

And then add one simpify to match.pd and define new DEF_INTERNAL_OPTAB_FN f=
or
it. Then we have the SAT_ADD representation after expand.

uint32_t sat_add (uint32_t x, uint32_t y)
{
  uint32_t _6;

;;   basic block 2, loop depth 0
;;    pred:       ENTRY
  _6 =3D .SAT_ADD (x_4(D), y_5(D)); [tail call]
  return _6;
;;    succ:       EXIT

}

If everything goes well, I will prepare the patch for it later. Thanks.=