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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/105431] ICE: SIGSEGV in powi_as_mults_1
 (tree-ssa-math-opts.cc:1512) with -Ofast and __builtin_pow()
Date: Fri, 29 Apr 2022 08:23:16 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105431

--- Comment #4 from Zdenek Sojka <zsojka at seznam dot cz> ---
(In reply to Richard Biener from comment #1)
> I can't reproduce in my dev tree but I guess the following will fix it?
>=20
> diff --git a/gcc/tree-ssa-math-opts.cc b/gcc/tree-ssa-math-opts.cc
> index 7555793948e..f3efd1ef4b2 100644
> --- a/gcc/tree-ssa-math-opts.cc
> +++ b/gcc/tree-ssa-math-opts.cc
> @@ -1495,7 +1495,7 @@ powi_cost (HOST_WIDE_INT n)
>=20=20
>  static tree
>  powi_as_mults_1 (gimple_stmt_iterator *gsi, location_t loc, tree type,
> -                HOST_WIDE_INT n, tree *cache)
> +                unsigned HOST_WIDE_INT n, tree *cache)
>  {
>    tree op0, op1, ssa_target;
>    unsigned HOST_WIDE_INT digit;
> @@ -1548,7 +1548,7 @@ powi_as_mults (gimple_stmt_iterator *gsi, location_t
> loc,
>    memset (cache, 0, sizeof (cache));
>    cache[1] =3D arg0;
>=20=20
> -  result =3D powi_as_mults_1 (gsi, loc, type, (n < 0) ? -n : n, cache);
> +  result =3D powi_as_mults_1 (gsi, loc, type, absu_hwi (n), cache);
>    if (n >=3D 0)
>      return result;


Thank you, I missed that "(n < 0) ? -n : n" in the code...
I can confirm the compiler bootstraps, and no longer crashes on the testcas=
e.
I didn't try to run the testsuite.=