[PATCH] Remove __isinf_ns

[Ondřej Bílka]

On Mon, Jun 15, 2015 at 11:44:48AM +0100, Wilco Dijkstra wrote:
> Remove all uses and definition of the internal function __isinf_ns(l/f) as there is no benefit in
> having it when isinf gets inlined in math.h (I'll post that as a separate patch).
> 
> GLIBC builds and passes math tests on AArch64. OK for commit?
> 
Almost ok.

> diff --git a/math/divtc3.c b/math/divtc3.c
> index bfd9b3f..c0dee8e 100644
> --- a/math/divtc3.c
> +++ b/math/divtc3.c
> @@ -54,19 +54,19 @@ __divtc3 (long double a, long double b, long double c, long double d)
>  	  x = __copysignl (INFINITY, c) * a;
>  	  y = __copysignl (INFINITY, c) * b;
>  	}
> -      else if ((__isinf_nsl (a) || __isinf_nsl (b))
> +      else if ((isinf (a) || isinf (b))
>  	       && isfinite (c) && isfinite (d))
>  	{
> -	  a = __copysignl (__isinf_nsl (a) ? 1 : 0, a);
> -	  b = __copysignl (__isinf_nsl (b) ? 1 : 0, b);
> +	  a = __copysignl (isinf (a) ? 1 : 0, a);
> +	  b = __copysignl (isinf (b) ? 1 : 0, b);
>  	  x = INFINITY * (a * c + b * d);
>  	  y = INFINITY * (b * c - a * d);
>  	}
> -      else if ((__isinf_nsl (c) || __isinf_nsl (d))
> +      else if ((isinf (c) || isinf (d))
>  	       && isfinite (a) && isfinite (b))
>  	{
> -	  c = __copysignl (__isinf_nsl (c) ? 1 : 0, c);
> -	  d = __copysignl (__isinf_nsl (d) ? 1 : 0, d);
> +	  c = __copysignl (isinf (c) ? 1 : 0, c);
> +	  d = __copysignl (isinf (d) ? 1 : 0, d);
>  	  x = 0.0 * (a * c + b * d);
>  	  y = 0.0 * (b * c - a * d);
>  	}

These patterns are unnecessary as with libc they could be written as

c = isinf (c);

with libc isinf.