[Bug target/112481] [14 Regression] RISCV: ICE: Segmentation fault when compiling pr110817-3.c

[rguenther at suse dot de via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112481

--- Comment #9 from rguenther at suse dot de <rguenther at suse dot de> ---
On Tue, 14 Nov 2023, ams at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112481
> 
> --- Comment #7 from Andrew Stubbs <ams at gcc dot gnu.org> ---
> Simply changing to OPTAB_WIDEN solves the ICE, but I don't know if it does so
> in a sensible way, for RISC V.
> 
> @@ -7489,7 +7489,7 @@ store_constructor (tree exp, rtx target, int cleared,
> poly_int64 size,
>             if (maybe_ne (GET_MODE_PRECISION (mode), nunits))
>               tmp = expand_binop (mode, and_optab, tmp,
>                                   GEN_INT ((1 << nunits) - 1), target,
> -                                 true, OPTAB_DIRECT);
> +                                 true, OPTAB_WIDEN);
>             if (tmp != target)
>               emit_move_insn (target, tmp);
>             break;
> 
> Here are the instructions it generates:
> 
> (set (reg:DI 165)
>     (and:DI (subreg:DI (reg:SI 164) 0)
>         (const_int 1 [0x1])))
> (set (reg:SI 154)
>     (subreg:SI (reg:DI 165) 0))
> 
> Should I use that patch? I think it's harmless on targets where OPTAB_DIRECT
> would work.

I think that's sensible.