Re: [PATCH] [PR rtl-optimization/97249]Simplify vec_select of paradoxical subreg.

[Richard Sandiford via Gcc-patches]

Hongtao Liu <crazy...@gmail.com> writes:
> +           poly_uint64 nunits
> +             = GET_MODE_NUNITS (GET_MODE (SUBREG_REG (trueop0)));
> +           rtx par = trueop1;
> +           for (int i = 0; i != l1; i++)
> +             {
> +               rtx idx = XVECEXP (trueop1, 0, i);
> +               if (!CONST_INT_P (idx)
> +                   || maybe_ge (UINTVAL (idx) + subreg_offset, nunits))
> +                 return 0;
> +             }

I think the previous version was better.  We shouldn't assume that
further simplification rules will fail just because the conditions
for this rule haven't been met.

Thanks,
Richard