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96 lines
3.5 KiB
C
96 lines
3.5 KiB
C
/*
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Compatibility <intrin.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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#ifndef KJK_INTRIN_H_
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#define KJK_INTRIN_H_
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#ifndef __GNUC__
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#error Unsupported compiler
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#endif
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/*
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FIXME: review all "memory" clobbers, add/remove to match Visual C++
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behavior: some "obvious" memory barriers are not present in the Visual C++
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implementation - e.g. __stosX; on the other hand, some memory barriers that
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*are* present could have been missed
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*/
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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: be very careful with declaring "memory" clobbers. Some "obvious"
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barriers aren't there in Visual C++ (e.g. __stosX)
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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: on GCC 4.1.0, please use the __sync_* built-ins for barriers and
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atomic operations. Test the version like this:
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#if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) > 40100
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...
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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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#if defined(__i386__)
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#include "intrin_x86.h"
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#elif defined(_PPC_)
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#include "intrin_ppc.h"
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#elif defined(_MIPS_)
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#include "intrin_mips.h"
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#elif defined(_M_ARM)
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#include "intrin_arm.h"
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#elif defined(__x86_64__)
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/* TODO: the x64 architecture shares most of the i386 intrinsics. It should be easy to support */
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#include "intrin_x86_64.h"
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#else
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#error Unsupported architecture
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#endif
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/*** Miscellaneous ***/
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/* BUGBUG: only good for use in macros. Cannot be taken the address of */
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#define __noop(...) ((void)0)
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/* TODO: __assume. GCC only supports the weaker __builtin_expect */
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#endif
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/* EOF */
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