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```* [PATCH] fdim(), fdimf() and fdiml() radically simplified
@ 2019-12-11  9:55 Stefan Kanthak
2019-12-11 10:39 ` Szabolcs Nagy
From: Stefan Kanthak @ 2019-12-11  9:55 UTC (permalink / raw)
To: musl

Yet another optimisation/simplification in the math subtree.

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;
}

```* Re: [PATCH] fdim(), fdimf() and fdiml() radically simplified
2019-12-11  9:55 [PATCH] fdim(), fdimf() and fdiml() radically simplified Stefan Kanthak
@ 2019-12-11 10:39 ` Szabolcs Nagy
0 siblings, 0 replies; 2+ messages in thread
From: Szabolcs Nagy @ 2019-12-11 10:39 UTC (permalink / raw)
To: Stefan Kanthak; +Cc: musl

* Stefan Kanthak <stefan.kanthak@nexgo.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;
>  }

```end of thread, back to index

2019-12-11  9:55 [PATCH] fdim(), fdimf() and fdiml() radically simplified Stefan Kanthak
2019-12-11 10:39 ` Szabolcs Nagy
```

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