1 /* origin: FreeBSD /usr/src/lib/msun/src/s_nextafterf.c */
3 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
13 * ====================================================
18 float nextafterf(float x, float y)
23 GET_FLOAT_WORD(hx, x);
24 GET_FLOAT_WORD(hy, y);
25 ix = hx & 0x7fffffff; /* |x| */
26 iy = hy & 0x7fffffff; /* |y| */
28 if (ix > 0x7f800000 || /* x is nan */
29 iy > 0x7f800000) /* y is nan */
31 if (x == y) /* x == y */
33 if (ix == 0) { /* x == 0 */
34 SET_FLOAT_WORD(x, (hy&0x80000000)|1); /* return +-minsubnormal */
35 /* raise underflow flag */
41 if (hx >= 0) { /* x > 0 */
42 if (hx > hy) { /* x > y, x -= ulp */
44 } else { /* x < y, x += ulp */
48 if (hy >= 0 || hx > hy) { /* x < y, x -= ulp */
50 } else { /* x > y, x += ulp */
55 if (hy >= 0x7f800000) /* overflow */
57 if (hy < 0x00800000) { /* underflow */
58 /* raise underflow flag */
61 SET_FLOAT_WORD(y, hx);
65 SET_FLOAT_WORD(x, hx);