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From: "linkw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/105459] [12/13 Regression] ICE: Segmentation
 fault (in record_operand_costs) since r12-3721-g63c6446f77b9001d
Date: Thu, 02 Jun 2022 02:15:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105459

--- Comment #11 from Kewen Lin <linkw at gcc dot gnu.org> ---
(In reply to Kewen Lin from comment #9)
> inline_call will force reload global optimization.
>=20
>   /* Reload global optimization flags.  */
>   if (reload_optimization_node && DECL_STRUCT_FUNCTION (to->decl) =3D=3D =
cfun)
>     set_cfun (cfun, true);
>=20
> It looks that ix86_set_current_function can create one new target option
> node even if fndecl =3D=3D ix86_previous_fndecl but
> flag_unsafe_math_optimizations (or flag_excess_precision) !=3D the
> corresponding values in the associated target node.

We can't do this during the target hook ix86_set_current_function since at =
that
time (WPA phase) the cfun is NULL, even if we want to update the target opt=
ion
node for to->decl, but the passed down fndecl is NULL.

I made a patch to rebuild the target option node for to->decl DECL once
reload_optimization_node is true. For this failure case, the
opts.x_flag_unsafe_math_optimizations has changed, we have to sync it to
x_ix86_unsafe_math_optimizations and rebuild.=