Create a branch for header work.

svn path=/branches/header-work/; revision=45691

include/crt/mingw32/intrin.h

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+/*
+	Compatibility <intrin.h> header for GCC -- GCC equivalents of intrinsic
+	Microsoft Visual C++ functions. Originally developed for the ReactOS
+	(<http://www.reactos.org/>) and TinyKrnl (<http://www.tinykrnl.org/>)
+	projects.
+
+	Copyright (c) 2006 KJK::Hyperion <hackbunny@reactos.com>
+
+	Permission is hereby granted, free of charge, to any person obtaining a
+	copy of this software and associated documentation files (the "Software"),
+	to deal in the Software without restriction, including without limitation
+	the rights to use, copy, modify, merge, publish, distribute, sublicense,
+	and/or sell copies of the Software, and to permit persons to whom the
+	Software is furnished to do so, subject to the following conditions:
+
+	The above copyright notice and this permission notice shall be included in
+	all copies or substantial portions of the Software.
+
+	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+	FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+	DEALINGS IN THE SOFTWARE.
+*/
+
+#ifndef KJK_INTRIN_H_
+#define KJK_INTRIN_H_
+
+#ifndef RC_INVOKED
+
+#define __INTRIN_INLINE extern __inline__ __attribute__((__always_inline__,__gnu_inline__))
+
+#ifndef _SIZE_T_DEFINED
+#define _SIZE_T_DEFINED
+#ifdef _WIN64
+  typedef unsigned __int64 size_t;
+#else
+  typedef unsigned int size_t;
+#endif
+#endif
+
+#ifndef _UINTPTR_T_DEFINED
+#define _UINTPTR_T_DEFINED
+#ifdef _WIN64
+  typedef unsigned __int64 uintptr_t;
+#else
+  typedef unsigned int uintptr_t;
+#endif
+#endif
+
+/*
+	FIXME: review all "memory" clobbers, add/remove to match Visual C++
+	behavior: some "obvious" memory barriers are not present in the Visual C++
+	implementation - e.g. __stosX; on the other hand, some memory barriers that
+	*are* present could have been missed
+*/
+
+/*
+	NOTE: this is a *compatibility* header. Some functions may look wrong at
+	first, but they're only "as wrong" as they would be on Visual C++. Our
+	priority is compatibility
+
+	NOTE: unlike most people who write inline asm for GCC, I didn't pull the
+	constraints and the uses of __volatile__ out of my... hat. Do not touch
+	them. I hate cargo cult programming
+
+	NOTE: be very careful with declaring "memory" clobbers. Some "obvious"
+	barriers aren't there in Visual C++ (e.g. __stosX)
+
+	NOTE: review all intrinsics with a return value, add/remove __volatile__
+	where necessary. If an intrinsic whose value is ignored generates a no-op
+	under Visual C++, __volatile__ must be omitted; if it always generates code
+	(for example, if it has side effects), __volatile__ must be specified. GCC
+	will only optimize out non-volatile asm blocks with outputs, so input-only
+	blocks are safe. Oddities such as the non-volatile 'rdmsr' are intentional
+	and follow Visual C++ behavior
+
+	NOTE: on GCC 4.1.0, please use the __sync_* built-ins for barriers and
+	atomic operations. Test the version like this:
+
+	#if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) > 40100
+		...
+
+	Pay attention to the type of barrier. Make it match with what Visual C++
+	would use in the same case
+*/
+
+#if defined(__i386__)
+#include "intrin_x86.h"
+#elif defined(_PPC_)
+#include "intrin_ppc.h"
+#elif defined(_MIPS_)
+#include "intrin_mips.h"
+#elif defined(_M_ARM)
+#include "intrin_arm.h"
+#elif defined(__x86_64__)
+/* TODO: the x64 architecture shares most of the i386 intrinsics. It should be easy to support */
+#include "intrin_x86.h"
+#else
+#error Unsupported architecture
+#endif
+
+
+/*** Miscellaneous ***/
+/* BUGBUG: only good for use in macros. Cannot be taken the address of */
+#define __noop(...) ((void)0)
+
+/* TODO: __assume. GCC only supports the weaker __builtin_expect */
+
+#endif
+
+#endif
+
+/* EOF */