2 * Copyright (c) 2004-2011 Hewlett-Packard Development Company, L.P.
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 /* For 64-bit systems, we extend the double type to hold two int64's. */
24 /* x86-64 (except for x32): __m128 serves as a placeholder which also */
25 /* requires the compiler to align it on 16-byte boundary (as required */
27 /* Similar things could be done for PPC 64-bit using a VMX data type. */
29 #if ((defined(__x86_64__) && __GNUC__ >= 4) || defined(_WIN64)) \
30 && !defined(__ILP32__)
31 # include <xmmintrin.h>
32 typedef __m128 double_ptr_storage;
33 #elif defined(_WIN32) && !defined(__GNUC__)
34 typedef unsigned __int64 double_ptr_storage;
35 #elif defined(__aarch64__)
36 typedef unsigned __int128 double_ptr_storage;
37 #elif defined(__i386__) && defined(__GNUC__)
38 typedef unsigned long long double_ptr_storage
39 __attribute__((__aligned__(8)));
41 typedef unsigned long long double_ptr_storage;
43 # define AO_HAVE_DOUBLE_PTR_STORAGE
46 struct { AO_t AO_v1; AO_t AO_v2; } AO_parts;
47 /* Note that AO_v1 corresponds to the low or the high part of */
48 /* AO_whole depending on the machine endianness. */
49 double_ptr_storage AO_whole;
50 /* AO_whole is now (starting from v7.3alpha3) the 2nd element */
51 /* of this union to make AO_DOUBLE_T_INITIALIZER portable */
52 /* (because __m128 definition could vary from a primitive type */
53 /* to a structure or array/vector). */
55 #define AO_HAVE_double_t
57 /* Note: AO_double_t volatile variables are not intended to be local */
58 /* ones (at least those which are passed to AO double-wide primitives */
59 /* as the first argument), otherwise it is the client responsibility to */
60 /* ensure they have double-word alignment. */
62 /* Dummy declaration as a compile-time assertion for AO_double_t size. */
63 struct AO_double_t_size_static_assert {
64 char dummy[sizeof(AO_double_t) == 2 * sizeof(AO_t) ? 1 : -1];
67 #define AO_DOUBLE_T_INITIALIZER { { (AO_t)0, (AO_t)0 } }
69 #define AO_val1 AO_parts.AO_v1
70 #define AO_val2 AO_parts.AO_v2