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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: Thu, 01 Feb 2024 13:06:06 +0000
X-Bugzilla-Reason: CC
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 4.6.2
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: pan2.li at intel dot com
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D51492

--- Comment #7 from Li Pan <pan2.li at intel dot com> ---
RISC-V backend reproduce code, build with "-march=3Drv64gcv_zba_zbb_zbc_zbs
--param=3Driscv-autovec-preference=3Dfixed-vlmax -Ofast -ffast-math"

typedef unsigned short uint16_t;

void AAA (uint16_t *x, uint16_t *y, unsigned wsize, unsigned count)
{
  unsigned m =3D 0, n =3D count;
  register uint16_t *p;

  p =3D x;

  do {
    m =3D *--p;
    *p =3D (uint16_t)(m >=3D wsize ? m-wsize : 0);
  } while (--n);

  n =3D wsize;
  p =3D y;

  do {
      m =3D *--p;
      *p =3D (uint16_t)(m >=3D wsize ? m-wsize : 0);
  } while (--n);
}=