[PATCH] middle-end/103193 - avoid canonicalizing <= and >= to == for floats

Richard Biener richard.guenther@gmail.com
Wed Nov 24 09:00:56 GMT 2021


On Mon, Nov 15, 2021 at 12:16 PM Richard Biener via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
>
> This avoids doing aforementioned canoncalization when -ftrapping-math
> is in effect and we honor NaNs.
>
> Bootstrapped and tested on x86_64-unknown-linux-gnu.
>
> OK?

Ping.

>
> Thanks,
> Richard.
>
> 2021-11-15  Richard Biener  <rguenther@suse.de>
>
>         PR middle-end/103193
>         * match.pd: Avoid canonicalizing (le/ge @0 @0) to (eq @0 @0)
>         with NaNs and -ftrapping-math.
> ---
>  gcc/match.pd | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/gcc/match.pd b/gcc/match.pd
> index a319aefa808..a7f1e56fe2f 100644
> --- a/gcc/match.pd
> +++ b/gcc/match.pd
> @@ -4629,7 +4629,10 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
>    (if (! FLOAT_TYPE_P (TREE_TYPE (@0))
>         || ! HONOR_NANS (@0))
>     { constant_boolean_node (true, type); }
> -   (if (cmp != EQ_EXPR)
> +   (if (cmp != EQ_EXPR
> +       /* With -ftrapping-math conversion to EQ loses an exception.  */
> +       && (! FLOAT_TYPE_P (TREE_TYPE (@0))
> +           || ! flag_trapping_math))
>      (eq @0 @0)))))
>  (for cmp (ne gt lt)
>   (simplify
> --
> 2.31.1


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