1/*
2 * Copyright (c) 2014 Advanced Micro Devices, Inc.
3 * Copyright (c) 2016 Aaron Watry
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to deal
7 * in the Software without restriction, including without limitation the rights
8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 * copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21 * THE SOFTWARE.
22 */
23
24#define __CLC_AS_GENTYPE __CLC_XCONCAT(as_, __CLC_GENTYPE)
25#define __CLC_AS_INTN __CLC_XCONCAT(as_, __CLC_INTN)
26
27#if __CLC_FPSIZE == 32
28_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE frexp(__CLC_GENTYPE x, __CLC_ADDRESS_SPACE __CLC_INTN *ep) {
29    __CLC_INTN i = __CLC_AS_INTN(x);
30    __CLC_INTN ai = i & 0x7fffffff;
31    __CLC_INTN d = ai > 0 & ai < 0x00800000;
32    /* scale subnormal by 2^26 without multiplying */
33    __CLC_GENTYPE s = __CLC_AS_GENTYPE(ai | 0x0d800000) - 0x1.0p-100f;
34    ai = select(ai, __CLC_AS_INTN(s), d);
35    __CLC_INTN e = (ai >> 23) - 126 - select((__CLC_INTN)0, (__CLC_INTN)26, d);
36    __CLC_INTN t = ai == (__CLC_INTN)0 | e == (__CLC_INTN)129;
37    i = (i & (__CLC_INTN)0x80000000) | (__CLC_INTN)0x3f000000 | (ai & 0x007fffff);
38    *ep = select(e, (__CLC_INTN)0, t);
39    return select(__CLC_AS_GENTYPE(i), x, t);
40}
41#endif
42
43#if __CLC_FPSIZE == 64
44#ifdef __CLC_SCALAR
45#define __CLC_AS_LONGN as_long
46#define __CLC_LONGN long
47#define __CLC_CONVERT_INTN convert_int
48#else
49#define __CLC_AS_LONGN __CLC_XCONCAT(as_long, __CLC_VECSIZE)
50#define __CLC_LONGN __CLC_XCONCAT(long, __CLC_VECSIZE)
51#define __CLC_CONVERT_INTN __CLC_XCONCAT(convert_int, __CLC_VECSIZE)
52#endif
53
54_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE frexp(__CLC_GENTYPE x, __CLC_ADDRESS_SPACE __CLC_INTN *ep) {
55    __CLC_LONGN i = __CLC_AS_LONGN(x);
56    __CLC_LONGN ai = i & 0x7fffffffffffffffL;
57    __CLC_LONGN d = ai > 0 & ai < 0x0010000000000000L;
58    // scale subnormal by 2^54 without multiplying
59    __CLC_GENTYPE s = __CLC_AS_GENTYPE(ai | 0x0370000000000000L) - 0x1.0p-968;
60    ai = select(ai, __CLC_AS_LONGN(s), d);
61    __CLC_LONGN e = (ai >> 52) - (__CLC_LONGN)1022 - select((__CLC_LONGN)0, (__CLC_LONGN)54, d);
62    __CLC_LONGN t = ai == 0 | e == 1025;
63    i = (i & (__CLC_LONGN)0x8000000000000000L) | (__CLC_LONGN)0x3fe0000000000000L | (ai & (__CLC_LONGN)0x000fffffffffffffL);
64    *ep = __CLC_CONVERT_INTN(select(e, 0L, t));
65    return select(__CLC_AS_GENTYPE(i), x, t);
66}
67
68#undef __CLC_AS_LONGN
69#undef __CLC_LONGN
70#undef __CLC_CONVERT_INTN
71#endif
72
73#undef __CLC_AS_GENTYPE
74#undef __CLC_AS_INTN
75