s_truncl.c (5014f8ded47a5e6d770ca588a2b929dff2617667) s_truncl.c (2f2ee27de4367161d0f6e3913c5921f0d002fd98)
1/*
2 * ====================================================
3 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
4 *
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
8 * is preserved.
9 * ====================================================
10 *
11 * From: @(#)s_floor.c 5.1 93/09/24
12 */
13
1/*
2 * ====================================================
3 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
4 *
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
8 * is preserved.
9 * ====================================================
10 *
11 * From: @(#)s_floor.c 5.1 93/09/24
12 */
13
14#include <sys/cdefs.h>
15__FBSDID("$FreeBSD$");
14#ifndef lint
15static char rcsid[] = "$FreeBSD$";
16#endif
16
17/*
18 * truncl(x)
19 * Return x rounded toward 0 to integral value
20 * Method:
21 * Bit twiddling.
22 * Exception:
23 * Inexact flag raised if x not equal to truncl(x).

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30#include "fpmath.h"
31
32#ifdef LDBL_IMPLICIT_NBIT
33#define MANH_SIZE (LDBL_MANH_SIZE + 1)
34#else
35#define MANH_SIZE LDBL_MANH_SIZE
36#endif
37
17
18/*
19 * truncl(x)
20 * Return x rounded toward 0 to integral value
21 * Method:
22 * Bit twiddling.
23 * Exception:
24 * Inexact flag raised if x not equal to truncl(x).

--- 6 unchanged lines hidden (view full) ---

31#include "fpmath.h"
32
33#ifdef LDBL_IMPLICIT_NBIT
34#define MANH_SIZE (LDBL_MANH_SIZE + 1)
35#else
36#define MANH_SIZE LDBL_MANH_SIZE
37#endif
38
38static const long double huge = 1.0e300;
39static const float zero[] = { 0.0, -0.0 };
40
41long double
42truncl(long double x)
43{
44 union IEEEl2bits u = { .e = x };
45 int e = u.bits.exp - LDBL_MAX_EXP + 1;
46
47 if (e < MANH_SIZE - 1) {
48 if (e < 0) { /* raise inexact if x != 0 */
39long double
40truncl(long double x)
41{
42 union IEEEl2bits u = { .e = x };
43 int e = u.bits.exp - LDBL_MAX_EXP + 1;
44
45 if (e < MANH_SIZE - 1) {
46 if (e < 0) { /* raise inexact if x != 0 */
49 if (huge + x > 0.0)
50 u.e = zero[u.bits.sign];
47 u.e = 0.0;
51 } else {
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 */
48 } else {
49 uint64_t m = ((1llu << MANH_SIZE) - 1) >> (e + 1);
50 if (((u.bits.manh & m) | u.bits.manl) == 0)
51 return (x); /* x is integral */
55 if (huge + x > 0.0) { /* raise inexact flag */
56 u.bits.manh &= ~m;
57 u.bits.manl = 0;
58 }
52 u.bits.manh &= ~m;
53 u.bits.manl = 0;
59 }
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 */
54 }
55 } else if (e < LDBL_MANT_DIG - 1) {
56 uint64_t m = (uint64_t)-1 >> (64 - LDBL_MANT_DIG + e + 1);
57 if ((u.bits.manl & m) == 0)
58 return (x); /* x is integral */
64 if (huge + x > 0.0) /* raise inexact flag */
65 u.bits.manl &= ~m;
59 u.bits.manl &= ~m;
66 }
67 return (u.e);
68}
60 }
61 return (u.e);
62}