-/*\r
- LUFA Library\r
- Copyright (C) Dean Camera, 2011.\r
-\r
- dean [at] fourwalledcubicle [dot] com\r
- www.lufa-lib.org\r
-*/\r
-\r
-/*\r
- Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com)\r
-\r
- Permission to use, copy, modify, distribute, and sell this\r
- software and its documentation for any purpose is hereby granted\r
- without fee, provided that the above copyright notice appear in\r
- all copies and that both that the copyright notice and this\r
- permission notice and warranty disclaimer appear in supporting\r
- documentation, and that the name of the author not be used in\r
- advertising or publicity pertaining to distribution of the\r
- software without specific, written prior permission.\r
-\r
- The author disclaim all warranties with regard to this\r
- software, including all implied warranties of merchantability\r
- and fitness. In no event shall the author be liable for any\r
- special, indirect or consequential damages or any damages\r
- whatsoever resulting from loss of use, data or profits, whether\r
- in an action of contract, negligence or other tortious action,\r
- arising out of or in connection with the use or performance of\r
- this software.\r
-*/\r
-\r
-/** \file\r
- * \brief Compiler specific macros for code optimization and correctness.\r
- *\r
- * \copydetails Group_CompilerSpecific\r
- *\r
- * \note Do not include this file directly, rather include the Common.h header file instead to gain this file's\r
- * functionality.\r
- */\r
-\r
-/** \ingroup Group_Common\r
- * \defgroup Group_CompilerSpecific Compiler Specific Macros\r
- * \brief Compiler specific macros for code optimization and correctness.\r
- *\r
- * Compiler specific macros to expose certain compiler features which may increase the level of code optimization\r
- * for a specific compiler, or correct certain issues that may be present such as memory barriers for use in conjunction\r
- * with atomic variable access. \r
- *\r
- * Where possible, on alternative compilers, these macros will either have no effect, or default to returning a sane value\r
- * so that they can be used in existing code without the need for extra compiler checks in the user application code.\r
- *\r
- * @{\r
- */\r
-\r
-#ifndef __LUFA_COMPILERSPEC_H__\r
-#define __LUFA_COMPILERSPEC_H__\r
-\r
- /* Preprocessor Checks: */\r
- #if !defined(__INCLUDE_FROM_COMMON_H)\r
- #error Do not include this file directly. Include LUFA/Common/Common.h instead to gain this functionality.\r
- #endif\r
-\r
- /* Public Interface - May be used in end-application: */\r
- /* Macros: */\r
- #if defined(__GNUC__) || defined(__DOXYGEN__)\r
- /** Forces GCC to use pointer indirection (via the device's pointer register pairs) when accessing the given\r
- * struct pointer. In some cases GCC will emit non-optimal assembly code when accessing a structure through\r
- * a pointer, resulting in a larger binary. When this macro is used on a (non \c const) structure pointer before\r
- * use, it will force GCC to use pointer indirection on the elements rather than direct store and load\r
- * instructions.\r
- *\r
- * \param[in, out] StructPtr Pointer to a structure which is to be forced into indirect access mode.\r
- */\r
- #define GCC_FORCE_POINTER_ACCESS(StructPtr) __asm__ __volatile__("" : "=b" (StructPtr) : "0" (StructPtr))\r
-\r
- /** Forces GCC to create a memory barrier, ensuring that memory accesses are not reordered past the barrier point.\r
- * This can be used before ordering-critical operations, to ensure that the compiler does not re-order the resulting\r
- * assembly output in an unexpected manner on sections of code that are ordering-specific.\r
- */\r
- #define GCC_MEMORY_BARRIER() __asm__ __volatile__("" ::: "memory");\r
- \r
- /** Evaluates to boolean true if the specified value can be determined at compile time to be a constant value\r
- * when compiling under GCC.\r
- *\r
- * \param[in] x Value to check compile time constantness of.\r
- *\r
- * \return Boolean true if the given value is known to be a compile time constant.\r
- */\r
- #define GCC_IS_COMPILE_CONST(x) __builtin_constant_p(x)\r
- #else\r
- #define GCC_FORCE_POINTER_ACCESS(StructPtr)\r
- #define GCC_MEMORY_BARRIER()\r
- #define GCC_IS_COMPILE_CONST(x) 0\r
- #endif\r
-\r
-#endif\r
-\r
-/** @} */\r
-\r
+/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2011.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+
+/*
+ Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, distribute, and sell this
+ software and its documentation for any purpose is hereby granted
+ without fee, provided that the above copyright notice appear in
+ all copies and that both that the copyright notice and this
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
+ software without specific, written prior permission.
+
+ The author disclaim all warranties with regard to this
+ software, including all implied warranties of merchantability
+ and fitness. In no event shall the author be liable for any
+ special, indirect or consequential damages or any damages
+ whatsoever resulting from loss of use, data or profits, whether
+ in an action of contract, negligence or other tortious action,
+ arising out of or in connection with the use or performance of
+ this software.
+*/
+
+/** \file
+ * \brief Compiler specific definitions for code optimization and correctness.
+ *
+ * \copydetails Group_CompilerSpecific
+ *
+ * \note Do not include this file directly, rather include the Common.h header file instead to gain this file's
+ * functionality.
+ */
+
+/** \ingroup Group_Common
+ * \defgroup Group_CompilerSpecific Compiler Specific Definitions
+ * \brief Compiler specific definitions for code optimization and correctness.
+ *
+ * Compiler specific definitions to expose certain compiler features which may increase the level of code optimization
+ * for a specific compiler, or correct certain issues that may be present such as memory barriers for use in conjunction
+ * with atomic variable access.
+ *
+ * Where possible, on alternative compilers, these macros will either have no effect, or default to returning a sane value
+ * so that they can be used in existing code without the need for extra compiler checks in the user application code.
+ *
+ * @{
+ */
+
+#ifndef __LUFA_COMPILERSPEC_H__
+#define __LUFA_COMPILERSPEC_H__
+
+ /* Preprocessor Checks: */
+ #if !defined(__INCLUDE_FROM_COMMON_H)
+ #error Do not include this file directly. Include LUFA/Common/Common.h instead to gain this functionality.
+ #endif
+
+ /* Public Interface - May be used in end-application: */
+ /* Macros: */
+ #if defined(__GNUC__) || defined(__DOXYGEN__)
+ /** Forces GCC to use pointer indirection (via the device's pointer register pairs) when accessing the given
+ * struct pointer. In some cases GCC will emit non-optimal assembly code when accessing a structure through
+ * a pointer, resulting in a larger binary. When this macro is used on a (non \c const) structure pointer before
+ * use, it will force GCC to use pointer indirection on the elements rather than direct store and load
+ * instructions.
+ *
+ * \param[in, out] StructPtr Pointer to a structure which is to be forced into indirect access mode.
+ */
+ #define GCC_FORCE_POINTER_ACCESS(StructPtr) __asm__ __volatile__("" : "=b" (StructPtr) : "0" (StructPtr))
+
+ /** Forces GCC to create a memory barrier, ensuring that memory accesses are not reordered past the barrier point.
+ * This can be used before ordering-critical operations, to ensure that the compiler does not re-order the resulting
+ * assembly output in an unexpected manner on sections of code that are ordering-specific.
+ */
+ #define GCC_MEMORY_BARRIER() __asm__ __volatile__("" ::: "memory");
+
+ /** Evaluates to boolean true if the specified value can be determined at compile time to be a constant value
+ * when compiling under GCC.
+ *
+ * \param[in] x Value to check compile time constantness of.
+ *
+ * \return Boolean true if the given value is known to be a compile time constant, false otherwise.
+ */
+ #define GCC_IS_COMPILE_CONST(x) __builtin_constant_p(x)
+ #else
+ #define GCC_FORCE_POINTER_ACCESS(StructPtr)
+ #define GCC_MEMORY_BARRIER()
+ #define GCC_IS_COMPILE_CONST(x) 0
+ #endif
+
+#endif
+
+/** @} */
+
projects / pub / USBasp.git / blobdiff