mirror of https://github.com/PCSX2/pcsx2.git
78 lines
3.2 KiB
C
78 lines
3.2 KiB
C
/*
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Compatibility <intrin_x86.h> header for GCC -- GCC equivalents of intrinsic
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Microsoft Visual C++ functions. Originally developed for the ReactOS
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(<http://www.reactos.org/>) and TinyKrnl (<http://www.tinykrnl.org/>)
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projects.
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Copyright (c) 2006 KJK::Hyperion <hackbunny@reactos.com>
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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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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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
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#pragma once
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/*
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NOTE: this is a *compatibility* header. Some functions may look wrong at
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first, but they're only "as wrong" as they would be on Visual C++. Our
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priority is compatibility
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NOTE: unlike most people who write inline asm for GCC, I didn't pull the
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constraints and the uses of __volatile__ out of my... hat. Do not touch
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them. I hate cargo cult programming
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NOTE: review all intrinsics with a return value, add/remove __volatile__
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where necessary. If an intrinsic whose value is ignored generates a no-op
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under Visual C++, __volatile__ must be omitted; if it always generates code
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(for example, if it has side effects), __volatile__ must be specified. GCC
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will only optimize out non-volatile asm blocks with outputs, so input-only
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blocks are safe. Oddities such as the non-volatile 'rdmsr' are intentional
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and follow Visual C++ behavior
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NOTE: GCC and Clang both support __sync_* built-ins for barriers and
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atomic operations.
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Pay attention to the type of barrier. Make it match with what Visual C++
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would use in the same case
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*/
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/*** Atomic operations ***/
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static __inline__ __attribute__((always_inline)) s32 _InterlockedExchange(volatile s32 * const Target, const s32 Value)
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{
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/* NOTE: __sync_lock_test_and_set would be an acquire barrier, so we force a full barrier */
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__sync_synchronize();
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return __sync_lock_test_and_set(Target, Value);
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}
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static __inline__ __attribute__((always_inline)) s64 _InterlockedExchange64(volatile s64 * const Target, const s64 Value)
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{
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/* NOTE: __sync_lock_test_and_set would be an acquire barrier, so we force a full barrier */
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__sync_synchronize();
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return __sync_lock_test_and_set(Target, Value);
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}
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/*** System information ***/
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static __inline__ __attribute__((always_inline)) unsigned long long _xgetbv(unsigned int index)
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{
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unsigned int eax, edx;
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__asm__ __volatile__("xgetbv" : "=a"(eax), "=d"(edx) : "c"(index));
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return ((unsigned long long)edx << 32) | eax;
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}
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