2 * ====================================================
3 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5 * Developed at SunPro, a Sun Microsystems, Inc. business.
6 * Permission to use, copy, modify, and distribute this
7 * software is freely granted, provided that this notice
9 * ====================================================
12 #include <sys/cdefs.h>
15 * Return x rounded toward 0 to integral value
19 * Inexact flag raised if x not equal to truncl(x).
28 #ifdef LDBL_IMPLICIT_NBIT
29 #define MANH_SIZE (LDBL_MANH_SIZE + 1)
31 #define MANH_SIZE LDBL_MANH_SIZE
34 static const long double huge = 1.0e300;
35 static const float zero[] = { 0.0, -0.0 };
40 union IEEEl2bits u = { .e = x };
41 int e = u.bits.exp - LDBL_MAX_EXP + 1;
43 if (e < MANH_SIZE - 1) {
44 if (e < 0) { /* raise inexact if x != 0 */
46 u.e = zero[u.bits.sign];
48 uint64_t m = ((1llu << MANH_SIZE) - 1) >> (e + 1);
49 if (((u.bits.manh & m) | u.bits.manl) == 0)
50 return (x); /* x is integral */
51 if (huge + x > 0.0) { /* raise inexact flag */
56 } else if (e < LDBL_MANT_DIG - 1) {
57 uint64_t m = (uint64_t)-1 >> (64 - LDBL_MANT_DIG + e + 1);
58 if ((u.bits.manl & m) == 0)
59 return (x); /* x is integral */
60 if (huge + x > 0.0) /* raise inexact flag */