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86 lines
3.9 KiB
C
86 lines
3.9 KiB
C
/*
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* Copyright (c) 2004-2011 Hewlett-Packard Development Company, L.P.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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/* For 64-bit systems, we expect the double type to hold two int64's. */
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#if ((defined(__x86_64__) && defined(AO_GCC_ATOMIC_TEST_AND_SET)) \
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|| defined(__aarch64__)) && !defined(__ILP32__)
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/* x86-64: __m128 is not applicable to atomic intrinsics. */
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# if AO_GNUC_PREREQ(4, 7) || AO_CLANG_PREREQ(3, 6)
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# pragma GCC diagnostic push
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/* Suppress warning about __int128 type. */
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# if defined(__clang__) || AO_GNUC_PREREQ(6, 4)
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# pragma GCC diagnostic ignored "-Wpedantic"
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# else
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/* GCC before ~4.8 does not accept "-Wpedantic" quietly. */
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# pragma GCC diagnostic ignored "-pedantic"
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# endif
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typedef unsigned __int128 double_ptr_storage;
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# pragma GCC diagnostic pop
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# else /* pragma diagnostic is not supported */
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typedef unsigned __int128 double_ptr_storage;
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# endif
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#elif ((defined(__x86_64__) && AO_GNUC_PREREQ(4, 0)) || defined(_WIN64)) \
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&& !defined(__ILP32__)
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/* x86-64 (except for x32): __m128 serves as a placeholder which also */
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/* requires the compiler to align it on 16-byte boundary (as required */
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/* by cmpxchg16b). */
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/* Similar things could be done for PPC 64-bit using a VMX data type. */
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# include <xmmintrin.h>
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typedef __m128 double_ptr_storage;
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#elif defined(_WIN32) && !defined(__GNUC__)
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typedef unsigned __int64 double_ptr_storage;
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#elif defined(__i386__) && defined(__GNUC__)
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typedef unsigned long long double_ptr_storage
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__attribute__((__aligned__(8)));
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#else
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typedef unsigned long long double_ptr_storage;
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#endif
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# define AO_HAVE_DOUBLE_PTR_STORAGE
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typedef union {
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struct { AO_t AO_v1; AO_t AO_v2; } AO_parts;
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/* Note that AO_v1 corresponds to the low or the high part of */
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/* AO_whole depending on the machine endianness. */
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double_ptr_storage AO_whole;
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/* AO_whole is now (starting from v7.3alpha3) the 2nd element */
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/* of this union to make AO_DOUBLE_T_INITIALIZER portable */
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/* (because __m128 definition could vary from a primitive type */
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/* to a structure or array/vector). */
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} AO_double_t;
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#define AO_HAVE_double_t
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/* Note: AO_double_t volatile variables are not intended to be local */
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/* ones (at least those which are passed to AO double-wide primitives */
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/* as the first argument), otherwise it is the client responsibility to */
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/* ensure they have double-word alignment. */
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/* Dummy declaration as a compile-time assertion for AO_double_t size. */
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struct AO_double_t_size_static_assert {
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char dummy[sizeof(AO_double_t) == 2 * sizeof(AO_t) ? 1 : -1];
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};
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#define AO_DOUBLE_T_INITIALIZER { { (AO_t)0, (AO_t)0 } }
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#define AO_val1 AO_parts.AO_v1
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#define AO_val2 AO_parts.AO_v2
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