1 /*-
2  * Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
3  * Copyright (c) 2002 David Schultz <das@FreeBSD.ORG>
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  *
27  * $FreeBSD$
28  */
29 
30 // ANDROID changed:
31 // - keep only little endian variants as they're the only one supported.
32 // - add long double structures here instead of _fpmath.h.
33 // - android uses 128 bits long doubles for LP64, so the structure and macros
34 //   were reworked for the quad precision ieee representation.
35 
36 #ifndef _FPMATH_
37 #define _FPMATH_
38 
39 #include <endian.h>
40 
41 union IEEEf2bits {
42   float f;
43   struct {
44     unsigned int man   :23;
45     unsigned int exp   :8;
46     unsigned int sign  :1;
47   } bits;
48 };
49 
50 #define DBL_MANH_SIZE  20
51 #define DBL_MANL_SIZE  32
52 
53 union IEEEd2bits {
54   double  d;
55   struct {
56     unsigned int manl  :32;
57     unsigned int manh  :20;
58     unsigned int exp   :11;
59     unsigned int sign  :1;
60   } bits;
61 };
62 
63 #ifdef __LP64__
64 
65 union IEEEl2bits {
66   long double e;
67   struct {
68     unsigned long manl  :64;
69     unsigned long manh  :48;
70     unsigned int  exp   :15;
71     unsigned int  sign  :1;
72   } bits;
73   struct {
74     unsigned long manl     :64;
75     unsigned long manh     :48;
76     unsigned int  expsign  :16;
77   } xbits;
78 };
79 
80 #define LDBL_NBIT  0
81 #define LDBL_IMPLICIT_NBIT
82 #define mask_nbit_l(u)  ((void)0)
83 
84 #define LDBL_MANH_SIZE  48
85 #define LDBL_MANL_SIZE  64
86 
87 #define LDBL_TO_ARRAY32(u, a) do {           \
88   (a)[0] = (uint32_t)(u).bits.manl;          \
89   (a)[1] = (uint32_t)((u).bits.manl >> 32);  \
90   (a)[2] = (uint32_t)(u).bits.manh;          \
91   (a)[3] = (uint32_t)((u).bits.manh >> 32);  \
92 } while(0)
93 
94 #endif // __LP64__
95 
96 #endif // _FPMATH_
97