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+/**************************************************************************
+ *
+ * Copyright 2007-2008 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ *
+ * 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, sub license, 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 (including the
+ * next paragraph) 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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 P_COMPILER_H
+#define P_COMPILER_H
+
+
+#include "p_config.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <stddef.h>
+#include <stdarg.h>
+
+
+#if defined(_WIN32) && !defined(__WIN32__)
+#define __WIN32__
+#endif
+
+#if defined(_MSC_VER)
+
+/* Avoid 'expression is always true' warning */
+#pragma warning(disable: 4296)
+
+#endif /* _MSC_VER */
+
+
+/*
+ * Alternative stdint.h and stdbool.h headers are supplied in include/c99 for
+ * systems that lack it.
+ */
+#ifndef __STDC_LIMIT_MACROS
+#define __STDC_LIMIT_MACROS 1
+#endif
+#include <stdint.h>
+#include <stdbool.h>
+
+
+#if !defined(__HAIKU__) && !defined(__USE_MISC)
+typedef unsigned int uint;
+typedef unsigned short ushort;
+#endif
+typedef unsigned char ubyte;
+
+typedef unsigned char boolean;
+#ifndef TRUE
+#define TRUE true
+#endif
+#ifndef FALSE
+#define FALSE false
+#endif
+
+/* Function inlining */
+#ifndef INLINE
+# ifdef __cplusplus
+# define INLINE inline
+# elif defined(__GNUC__)
+# define INLINE __inline__
+# elif defined(_MSC_VER)
+# define INLINE __inline
+# elif defined(__ICL)
+# define INLINE __inline
+# elif defined(__INTEL_COMPILER)
+# define INLINE inline
+# elif defined(__WATCOMC__) && (__WATCOMC__ >= 1100)
+# define INLINE __inline
+# elif defined(__SUNPRO_C) && defined(__C99FEATURES__)
+# define INLINE inline
+# elif (__STDC_VERSION__ >= 199901L) /* C99 */
+# define INLINE inline
+# else
+# define INLINE
+# endif
+#endif
+
+
+/* Function visibility */
+#ifndef PUBLIC
+# if defined(__GNUC__) || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
+# define PUBLIC __attribute__((visibility("default")))
+# elif defined(_MSC_VER)
+# define PUBLIC __declspec(dllexport)
+# else
+# define PUBLIC
+# endif
+#endif
+
+
+/* The __FUNCTION__ gcc variable is generally only used for debugging.
+ * If we're not using gcc, define __FUNCTION__ as a cpp symbol here.
+ */
+#ifndef __FUNCTION__
+# if !defined(__GNUC__)
+# if (__STDC_VERSION__ >= 199901L) /* C99 */ || \
+ (defined(__SUNPRO_C) && defined(__C99FEATURES__))
+# define __FUNCTION__ __func__
+# else
+# define __FUNCTION__ "<unknown>"
+# endif
+# endif
+# if defined(_MSC_VER) && _MSC_VER < 1300
+# define __FUNCTION__ "<unknown>"
+# endif
+#endif
+
+
+
+/* This should match linux gcc cdecl semantics everywhere, so that we
+ * just codegen one calling convention on all platforms.
+ */
+#ifdef _MSC_VER
+#define PIPE_CDECL __cdecl
+#else
+#define PIPE_CDECL
+#endif
+
+
+
+#if defined(__GNUC__)
+#define PIPE_DEPRECATED __attribute__((__deprecated__))
+#else
+#define PIPE_DEPRECATED
+#endif
+
+
+
+/* Macros for data alignment. */
+#if defined(__GNUC__) || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
+
+/* See http://gcc.gnu.org/onlinedocs/gcc-4.4.2/gcc/Type-Attributes.html */
+#define PIPE_ALIGN_TYPE(_alignment, _type) _type __attribute__((aligned(_alignment)))
+
+/* See http://gcc.gnu.org/onlinedocs/gcc-4.4.2/gcc/Variable-Attributes.html */
+#define PIPE_ALIGN_VAR(_alignment) __attribute__((aligned(_alignment)))
+
+#if (__GNUC__ > 4 || (__GNUC__ == 4 &&__GNUC_MINOR__>1)) && !defined(PIPE_ARCH_X86_64)
+#define PIPE_ALIGN_STACK __attribute__((force_align_arg_pointer))
+#else
+#define PIPE_ALIGN_STACK
+#endif
+
+#elif defined(_MSC_VER)
+
+/* See http://msdn.microsoft.com/en-us/library/83ythb65.aspx */
+#define PIPE_ALIGN_TYPE(_alignment, _type) __declspec(align(_alignment)) _type
+#define PIPE_ALIGN_VAR(_alignment) __declspec(align(_alignment))
+
+#define PIPE_ALIGN_STACK
+
+#elif defined(SWIG)
+
+#define PIPE_ALIGN_TYPE(_alignment, _type) _type
+#define PIPE_ALIGN_VAR(_alignment)
+
+#define PIPE_ALIGN_STACK
+
+#else
+
+#error "Unsupported compiler"
+
+#endif
+
+/* You should use these macros to mark if blocks where the if condition
+ * is either likely to be true, or unlikely to be true.
+ *
+ * This will inform human readers of this fact, and will also inform
+ * the compiler, who will in turn inform the CPU.
+ *
+ * CPUs often start executing code inside the if or the else blocks
+ * without knowing whether the condition is true or not, and will have
+ * to throw the work away if they find out later they executed the
+ * wrong part of the if.
+ *
+ * If these macros are used, the CPU is more likely to correctly predict
+ * the right path, and will avoid speculatively executing the wrong branch,
+ * thus not throwing away work, resulting in better performance.
+ *
+ * In light of this, it is also a good idea to mark as "likely" a path
+ * which is not necessarily always more likely, but that will benefit much
+ * more from performance improvements since it is already much faster than
+ * the other path, or viceversa with "unlikely".
+ *
+ * Example usage:
+ * if(unlikely(do_we_need_a_software_fallback()))
+ * do_software_fallback();
+ * else
+ * render_with_gpu();
+ *
+ * The macros follow the Linux kernel convention, and more examples can
+ * be found there.
+ *
+ * Note that profile guided optimization can offer better results, but
+ * needs an appropriate coverage suite and does not inform human readers.
+ */
+#ifdef __GNUC__
+#define likely(x) __builtin_expect(!!(x), 1)
+#define unlikely(x) __builtin_expect(!!(x), 0)
+#else
+#define likely(x) !!(x)
+#define unlikely(x) !!(x)
+#endif
+
+#endif /* P_COMPILER_H */