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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/89922] Loop on fixed size array is not
 unrolled and poorly optimized at -O2
Date: Wed, 22 Dec 2021 09:35:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D89922

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|middle-end                  |tree-optimization
           Severity|normal                      |enhancement

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Estimating sizes for loop 1
 BB: 3, after_exit: 0
  size:   1 _1 =3D <retval>.data[j_16];
  size:   1 _2 =3D _1 + j_16;
  size:   1 <retval>.data[j_16] =3D _2;
  size:   1 j_13 =3D j_16 + 1;
   Induction variable computation will be folded away.
  size:   1 ivtmp_4 =3D ivtmp_18 - 1;
   Induction variable computation will be folded away.
  size:   2 if (ivtmp_4 !=3D 0)
   Exit condition will be eliminated in peeled copies.
   Exit condition will be eliminated in last copy.
   Constant conditional.
 BB: 5, after_exit: 1
size: 7-4, last_iteration: 7-4
  Loop size: 7
  Estimated size after unrolling: 10
Not unrolling loop 1: size would grow.=