2.5-18.1

1 files changed, 89 insertions, 0 deletions

diff --git a/sysdeps/ieee754/ldbl-128ibm/s_nexttowardf.c b/sysdeps/ieee754/ldbl-128ibm/s_nexttowardf.c
new file mode 100644
index 0000000000..cf655fad16
--- /dev/null
+++ b/sysdeps/ieee754/ldbl-128ibm/s_nexttowardf.c
@@ -0,0 +1,89 @@
+/* s_nexttowardf.c -- float version of s_nextafter.c.
+ * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com
+ * and Jakub Jelinek, jj@ultra.linux.cz.
+ */
+
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+#if defined(LIBM_SCCS) && !defined(lint)
+static char rcsid[] = "$NetBSD: $";
+#endif
+
+#include "math.h"
+#include <math_private.h>
+#include <math_ldbl_opt.h>
+#include <float.h>
+
+#ifdef __STDC__
+	float __nexttowardf(float x, long double y)
+#else
+	float __nexttowardf(x,y)
+	float x;
+	long double y;
+#endif
+{
+	int32_t hx,ix;
+	int64_t hy,iy;
+	u_int64_t ly, uly;
+
+	GET_FLOAT_WORD(hx,x);
+	GET_LDOUBLE_WORDS64(hy,ly,y);
+	ix = hx&0x7fffffff;		/* |x| */
+	iy = hy&0x7fffffffffffffffLL;	/* |y| */
+	uly = ly&0x7fffffffffffffffLL;	/* |y| */
+
+	if((ix>0x7f800000) ||   /* x is nan */
+	   ((iy>=0x7ff0000000000000LL)&&((iy-0x7ff0000000000000LL)|uly)!=0))
+				/* y is nan */
+	   return x+y;
+	if((long double) x==y) return y;	/* x=y, return y */
+	if(ix==0) {				/* x == 0 */
+	    float u;
+	    SET_FLOAT_WORD(x,(u_int32_t)((hy>>32)&0x80000000)|1);/* return +-minsub*/
+	    u = math_opt_barrier (x);
+	    u = u * u;
+	    math_force_eval (u);		/* raise underflow flag */
+	    return x;
+	}
+	if(hx>=0) {				/* x > 0 */
+	    if(hy<0||(ix>>23)>(iy>>52)-0x380
+	       || ((ix>>23)==(iy>>52)-0x380
+		   && (ix&0x7fffff)>((hy>>29)&0x7fffff))) {/* x > y, x -= ulp */
+		hx -= 1;
+	    } else {				/* x < y, x += ulp */
+		hx += 1;
+	    }
+	} else {				/* x < 0 */
+	    if(hy>=0||(ix>>23)>(iy>>52)-0x380
+	       || ((ix>>23)==(iy>>52)-0x380
+		   && (ix&0x7fffff)>((hy>>29)&0x7fffff))) {/* x < y, x -= ulp */
+		hx -= 1;
+	    } else {				/* x > y, x += ulp */
+		hx += 1;
+	    }
+	}
+	hy = hx&0x7f800000;
+	if(hy>=0x7f800000) {
+	  x = x+x;	/* overflow  */
+	  if (FLT_EVAL_METHOD != 0)
+	    /* Force conversion to float.  */
+	    asm ("" : "+m"(x));
+	  return x;
+	}
+	if(hy<0x00800000) {		/* underflow */
+	    float u = x*x;
+	    math_force_eval (u);	/* raise underflow flag */
+	}
+	SET_FLOAT_WORD(x,hx);
+	return x;
+}
+long_double_symbol (libm, __nexttowardf, nexttowardf);