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Message-ID: <20191211103935.GM23985@port70.net>
Date: Wed, 11 Dec 2019 11:39:36 +0100
From: Szabolcs Nagy <nsz@...t70.net>
To: Stefan Kanthak <stefan.kanthak@...go.de>
Cc: musl@...ts.openwall.com
Subject: Re: [PATCH] fdim(), fdimf() and fdiml() radically simplified
* Stefan Kanthak <stefan.kanthak@...go.de> [2019-12-11 10:55:01 +0100]:
> Yet another optimisation/simplification in the math subtree.
these changes have incorrect fenv behaviour
(they signal the invalid exception on qnan input),
the result is fine though.
>
> JFTR: I'm NOT subscribed to your mailing list, so CC: me in replies!
>
> --- -/src/math/fdim.c
> +++ +/src/math/fdim.c
> @@ -3,8 +3,4 @@
> double fdim(double x, double y)
> {
> - if (isnan(x))
> - return x;
> - if (isnan(y))
> - return y;
> - return x > y ? x - y : 0;
> + return x <= y ? 0.0 : x - y;
> }
>
> --- -/src/math/fdimf.c
> +++ +/src/math/fdimf.c
> @@ -3,8 +3,4 @@
> float fdimf(float x, float y)
> {
> - if (isnan(x))
> - return x;
> - if (isnan(y))
> - return y;
> - return x > y ? x - y : 0;
> + return x <= y ? 0.0 : x - y;
> }
>
> --- -/src/math/fdiml.c
> +++ +/src/math/fdiml.c
> @@ -10,8 +10,4 @@
> long double fdiml(long double x, long double y)
> {
> - if (isnan(x))
> - return x;
> - if (isnan(y))
> - return y;
> - return x > y ? x - y : 0;
> + return x <= y ? 0.0 : x - y;
> }
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