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 * ====================================================
11 * From: @(#)s_floor.c 5.1 93/09/24
14 #include <sys/cdefs.h>
15 __FBSDID("$FreeBSD$");
19 * Return x rounded toward 0 to integral value
23 * Inexact flag raised if x not equal to truncl(x).
32 #ifdef LDBL_IMPLICIT_NBIT
33 #define MANH_SIZE (LDBL_MANH_SIZE + 1)
35 #define MANH_SIZE LDBL_MANH_SIZE
38 static const long double huge = 1.0e300;
39 static const float zero[] = { 0.0, -0.0 };
44 union IEEEl2bits u = { .e = x };
45 int e = u.bits.exp - LDBL_MAX_EXP + 1;
47 if (e < MANH_SIZE - 1) {
48 if (e < 0) { /* raise inexact if x != 0 */
50 u.e = zero[u.bits.sign];
52 uint64_t m = ((1llu << MANH_SIZE) - 1) >> (e + 1);
53 if (((u.bits.manh & m) | u.bits.manl) == 0)
54 return (x); /* x is integral */
55 if (huge + x > 0.0) { /* raise inexact flag */
60 } else if (e < LDBL_MANT_DIG - 1) {
61 uint64_t m = (uint64_t)-1 >> (64 - LDBL_MANT_DIG + e + 1);
62 if ((u.bits.manl & m) == 0)
63 return (x); /* x is integral */
64 if (huge + x > 0.0) /* raise inexact flag */