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
12 * $FreeBSD: head/lib/msun/src/s_truncl.c 176280 2008-02-14 15:10:34Z bde $
17 * Return x rounded toward 0 to integral value
21 * Inexact flag raised if x not equal to truncl(x).
30 #ifdef LDBL_IMPLICIT_NBIT
31 #define MANH_SIZE (LDBL_MANH_SIZE + 1)
33 #define MANH_SIZE LDBL_MANH_SIZE
36 static const long double huge = 1.0e300;
37 static const float zero[] = { 0.0, -0.0 };
42 union IEEEl2bits u = { .e = x };
43 int e = u.bits.exp - LDBL_MAX_EXP + 1;
45 if (e < MANH_SIZE - 1) {
46 if (e < 0) { /* raise inexact if x != 0 */
48 u.e = zero[u.bits.sign];
50 uint64_t m = ((1llu << MANH_SIZE) - 1) >> (e + 1);
51 if (((u.bits.manh & m) | u.bits.manl) == 0)
52 return (x); /* x is integral */
53 if (huge + x > 0.0) { /* raise inexact flag */
58 } else if (e < LDBL_MANT_DIG - 1) {
59 uint64_t m = (uint64_t)-1 >> (64 - LDBL_MANT_DIG + e + 1);
60 if ((u.bits.manl & m) == 0)
61 return (x); /* x is integral */
62 if (huge + x > 0.0) /* raise inexact flag */