yann@1201: Original patch from: gentoo/src/patchsets/glibc/2.9/1073_all_glibc-ldbl-nexttowardf.patch
yann@1201: 
yann@1201: -= BEGIN original header =-
yann@1201: ripped from Debian
yann@1201: 
yann@1201: this change was made to generic __nexttowardf, but not the long double version
yann@1201: 
yann@1201: 2008-05-05  Aurelien Jarno  <aurelien@aurel32.net>
yann@1201: 
yann@1201: 	* sysdeps/ieee754/ldbl-128/s_nexttowardf.c: Include float.h.
yann@1201: 	(__nexttowardf): Use math_opt_barrier and
yann@1201: 	math_force_eval macros.  If FLT_EVAL_METHOD is not 0, force
yann@1201: 	x to float using asm.
yann@1201: 
yann@1201: -= END original header =-
yann@1201: 
yann@1201: diff -durN glibc-2_9.orig/sysdeps/ieee754/ldbl-128/s_nexttowardf.c glibc-2_9/sysdeps/ieee754/ldbl-128/s_nexttowardf.c
yann@1201: --- glibc-2_9.orig/sysdeps/ieee754/ldbl-128/s_nexttowardf.c	1999-07-14 02:09:42.000000000 +0200
yann@1201: +++ glibc-2_9/sysdeps/ieee754/ldbl-128/s_nexttowardf.c	2009-02-02 22:00:59.000000000 +0100
yann@1201: @@ -19,7 +19,8 @@
yann@1201:  #endif
yann@1201:  
yann@1201:  #include "math.h"
yann@1201: -#include "math_private.h"
yann@1201: +#include <math_private.h>
yann@1201: +#include <float.h>
yann@1201:  
yann@1201:  #ifdef __STDC__
yann@1201:  	float __nexttowardf(float x, long double y)
yann@1201: @@ -44,10 +45,12 @@
yann@1201:  	   return x+y;
yann@1201:  	if((long double) x==y) return y;	/* x=y, return y */
yann@1201:  	if(ix==0) {				/* x == 0 */
yann@1201: -	    float x2;
yann@1201: +	    float u;
yann@1201:  	    SET_FLOAT_WORD(x,(u_int32_t)((hy>>32)&0x80000000)|1);/* return +-minsub*/
yann@1201: -	    x2 = x*x;
yann@1201: -	    if(x2==x) return x2; else return x;	/* raise underflow flag */
yann@1201: +	    u = math_opt_barrier (x);
yann@1201: +	    u = u * u;
yann@1201: +	    math_force_eval (u);		/* raise underflow flag */
yann@1201: +	    return x;
yann@1201:  	}
yann@1201:  	if(hx>=0) {				/* x > 0 */
yann@1201:  	    if(hy<0||(ix>>23)>(iy>>48)-0x3f80
yann@1201: @@ -67,13 +70,16 @@
yann@1201:  	    }
yann@1201:  	}
yann@1201:  	hy = hx&0x7f800000;
yann@1201: -	if(hy>=0x7f800000) return x+x;	/* overflow  */
yann@1201: +	if(hy>=0x7f800000) {
yann@1201: +	  x = x+x;	/* overflow  */
yann@1201: +	  if (FLT_EVAL_METHOD != 0)
yann@1201: +	    /* Force conversion to float.  */
yann@1201: +	    asm ("" : "+m"(x));
yann@1201: +	  return x;
yann@1201: +	}
yann@1201:  	if(hy<0x00800000) {		/* underflow */
yann@1201: -	    float x2 = x*x;
yann@1201: -	    if(x2!=x) {		/* raise underflow flag */
yann@1201: -	        SET_FLOAT_WORD(x2,hx);
yann@1201: -		return x2;
yann@1201: -	    }
yann@1201: +	    float u = x*x;
yann@1201: +	    math_force_eval (u);	/* raise underflow flag */
yann@1201:  	}
yann@1201:  	SET_FLOAT_WORD(x,hx);
yann@1201:  	return x;