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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/109301] [13 Regression] ICE in format_helper,
 at real.h:233 since r13-1763
Date: Tue, 28 Mar 2023 07:20:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109301

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #3)
> Tried -Ofast -mavx512f
> #include <math.h>
>=20
> void
> foo (double *a, double *b)
> {
>   for (int i =3D 0; i < 1024; i++)
>     a[i] =3D pow (a[i], b[i]);
> }
>=20
> void
> bar (double *a)
> {
>   for (int i =3D 0; i < 1024; i++)
>     a[i] =3D cbrt (sqrt (a[i]));
> }
>=20
> void
> baz (double *a)
> {
>   for (int i =3D 0; i < 1024; i++)
>     a[i] =3D cbrt (cbrt (a[i]));
> }
> but that doesn't trigger, it uses simd clones rather than internal functi=
ons.
> Strangely, bar isn't vectorized while foo and baz are.

I only see foo vectorized (with simdclones), neither bar nor baz are - prob=
ably
because cbrt isn't available in vector form and we don't resort to pow()
here for baz because

  /* cbrt(cbrt(x)) -> pow(x,1/9), iff x is nonnegative.  */
  (simplify
   (cbrts (cbrts tree_expr_nonnegative_p@0))
   (pows @0 { build_real_truncate (type, dconst_ninth ()); }))

doesn't trigger.  Later the 'powcabs' pass synthesizes cbrt(sqrt()) again
but at least for me no cbrt vectorized variant is available.=