I'll defer to the PPC maintainers, but LGTM. The less special casing, the
better.

Aldy

On Wed, May 8, 2024, 07:33 Kewen.Lin <linkw@linux.ibm.com> wrote:

> Hi,
>
> This reverts commit r14-6478-gfda8e2f8292a90 "range:
> Workaround different type precision between _Float128 and
> long double [PR112788]" as the fixes for PR112993 make
> all 128 bits scalar floating point have the same 128 bit
> precision, this workaround isn't needed any more.
>
> Bootstrapped and regress-tested on:
>   - powerpc64-linux-gnu P8/P9 (with ibm128 by default)
>   - powerpc64le-linux-gnu P9/P10 (with ibm128 by default)
>   - powerpc64le-linux-gnu P9 (with ieee128 by default)
>
> Is it OK for trunk if {1,2}/4 in this series get landed?
>
> BR,
> Kewen
> -----
>
>         PR target/112993
>
> gcc/ChangeLog:
>
>         * value-range.h (range_compatible_p): Remove the workaround on
>         different type precision between _Float128 and long double.
> ---
>  gcc/value-range.h | 10 ++--------
>  1 file changed, 2 insertions(+), 8 deletions(-)
>
> diff --git a/gcc/value-range.h b/gcc/value-range.h
> index 9531df56988..39de7daf3d9 100644
> --- a/gcc/value-range.h
> +++ b/gcc/value-range.h
> @@ -1558,13 +1558,7 @@ range_compatible_p (tree type1, tree type2)
>    // types_compatible_p requires conversion in both directions to be
> useless.
>    // GIMPLE only requires a cast one way in order to be compatible.
>    // Ranges really only need the sign and precision to be the same.
> -  return TYPE_SIGN (type1) == TYPE_SIGN (type2)
> -        && (TYPE_PRECISION (type1) == TYPE_PRECISION (type2)
> -            // FIXME: As PR112788 shows, for now on rs6000 _Float128 has
> -            // type precision 128 while long double has type precision 127
> -            // but both have the same mode so their precision is actually
> -            // the same, workaround it temporarily.
> -            || (SCALAR_FLOAT_TYPE_P (type1)
> -                && TYPE_MODE (type1) == TYPE_MODE (type2)));
> +  return (TYPE_PRECISION (type1) == TYPE_PRECISION (type2)
> +         && TYPE_SIGN (type1) == TYPE_SIGN (type2));
>  }
>  #endif // GCC_VALUE_RANGE_H
> --
> 2.39.1
>
>