1 files changed, 78 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/s_nexttowardf.c b/sysdeps/libm-ieee754/s_nexttowardf.c
new file mode 100644
index 0000000000..71a28987ec
--- /dev/null
+++ b/sysdeps/libm-ieee754/s_nexttowardf.c
@@ -0,0 +1,78 @@
+/* s_nexttowardf.c -- float version of s_nextafter.c.
+ * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
+ */
+
+/*
+ * ====================================================
+ * 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"
+
+#ifdef __STDC__
+	float __nexttowardf(float x, long double y)
+#else
+	float __nexttowardf(x,y)
+	float x;
+	long double y;
+#endif
+{
+	int32_t hx,ix,iy;
+	u_int32_t hy,ly,esy;
+
+	GET_FLOAT_WORD(hx,x);
+	GET_LDOUBLE_WORDS(esy,hy,ly,y);
+	ix = hx&0x7fffffff;		/* |x| */
+	iy = esy&0x7fff;		/* |y| */
+
+	if((ix>0x7f800000) ||   /* x is nan */
+	   (iy>=0x7fff&&((hy|ly)|-(hy|ly))!=0))     /* y is nan */
+	   return x+y;
+	if((long double) x==y) return y;	/* x=y, return y */
+	if(ix==0) {				/* x == 0 */
+	    float x2;
+	    SET_FLOAT_WORD(x,(esy&0x8000?0x80000000:0)|1);/* return +-minsub*/
+	    x2 = x*x;
+	    if(x2==x) return x2; else return x;	/* raise underflow flag */
+	}
+	if(hx>=0) {				/* x > 0 */
+	    if(esy>=0x8000||((ix>>23)&0xff)>iy
+	       || (((ix>>23)&0xff)==iy
+		   && ((ix&0x7fffff)<<8)>(hy&0x7fffffff))) {/* x > y, x -= ulp */
+		hx -= 1;
+	    } else {				/* x < y, x += ulp */
+		hx += 1;
+	    }
+	} else {				/* x < 0 */
+	    if(esy<0x8000||((ix>>23)&0xff)>iy
+	       || (((ix>>23)&0xff)==iy
+		   && ((ix&0x7fffff)<<8)>(hy&0x7fffffff))) {/* x < y, x -= ulp */
+		hx -= 1;
+	    } else {				/* x > y, x += ulp */
+		hx += 1;
+	    }
+	}
+	hy = hx&0x7f800000;
+	if(hy>=0x7f800000) return x+x;	/* overflow  */
+	if(hy<0x00800000) {		/* underflow */
+	    float x2 = x*x;
+	    if(x2!=x) {		/* raise underflow flag */
+	        SET_FLOAT_WORD(x2,hx);
+		return x2;
+	    }
+	}
+	SET_FLOAT_WORD(x,hx);
+	return x;
+}
+weak_alias (__nexttowardf, nexttowardf)