diff options
Diffstat (limited to 'nuttx/lib/string/lib_vikmemcpy.c')
| -rw-r--r-- | nuttx/lib/string/lib_vikmemcpy.c | 348 |
1 files changed, 0 insertions, 348 deletions
diff --git a/nuttx/lib/string/lib_vikmemcpy.c b/nuttx/lib/string/lib_vikmemcpy.c deleted file mode 100644 index b50942aaa..000000000 --- a/nuttx/lib/string/lib_vikmemcpy.c +++ /dev/null @@ -1,348 +0,0 @@ -/****************************************************************************
- * File: lib/string/lib_vikmemcpy.c
- *
- * This is version of the optimized memcpy by Daniel Vik, adapted to the
- * NuttX environment.
- *
- * Copyright (C) 1999-2010 Daniel Vik
- *
- * Adaptations include:
- * - File name change
- * - Use of types defined in stdint.h
- * - Integration with the NuttX configuration system
- * - Other cosmetic changes for consistency with NuttX coding standards
- *
- * This software is provided 'as-is', without any express or implied
- * warranty. In no event will the authors be held liable for any
- * damages arising from the use of this software.
- * Permission is granted to anyone to use this software for any
- * purpose, including commercial applications, and to alter it and
- * redistribute it freely, subject to the following restrictions:
- *
- * 1. The origin of this software must not be misrepresented; you
- * must not claim that you wrote the original software. If you
- * use this software in a product, an acknowledgment in the
- * use this software in a product, an acknowledgment in the
- * product documentation would be appreciated but is not
- * required.
- *
- * 2. Altered source versions must be plainly marked as such, and
- * must not be misrepresented as being the original software.
- *
- * 3. This notice may not be removed or altered from any source
- * distribution.
- *
- * Description: Implementation of the standard library function memcpy.
- * This implementation of memcpy() is ANSI-C89 compatible.
- *
- * The following configuration options can be set:
- *
- * CONFIG_ENDIAN_BIG
- * Uses processor with big endian addressing. Default is little endian.
- *
- * CONFIG_MEMCPY_PRE_INC_PTRS
- * Use pre increment of pointers. Default is post increment of pointers.
- *
- * CONFIG_MEMCPY_INDEXED_COPY
- * Copying data using array indexing. Using this option, disables the
- * CONFIG_MEMCPY_PRE_INC_PTRS option.
- *
- * CONFIG_MEMCPY_64BIT - Compiles memcpy for 64 bit architectures
- *
- ****************************************************************************/
-
-/****************************************************************************
- * Configuration definitions.
- ****************************************************************************/
-
-#define CONFIG_MEMCPY_INDEXED_COPY
-
-/********************************************************************
- * Included Files
- *******************************************************************/
-
-#include <nuttx/config.h>
-#include <nuttx/compiler.h>
-
-#include <stddef.h>
-#include <stdint.h>
-#include <string.h>
-
-/********************************************************************
- * Pre-processor Definitions
- *******************************************************************/
-
-/* Can't support CONFIG_MEMCPY_64BIT if the platform does not have 64-bit
- * integer types.
- */
-
-#ifndef CONFIG_HAVE_LONG_LONG
-# undef CONFIG_MEMCPY_64BIT
-#endif
-
-/* Remove definitions when CONFIG_MEMCPY_INDEXED_COPY is defined */
-
-#if defined (CONFIG_MEMCPY_INDEXED_COPY)
-# if defined (CONFIG_MEMCPY_PRE_INC_PTRS)
-# undef CONFIG_MEMCPY_PRE_INC_PTRS
-# endif /* CONFIG_MEMCPY_PRE_INC_PTRS */
-#endif /* CONFIG_MEMCPY_INDEXED_COPY */
-
-/* Definitions for pre and post increment of pointers */
-
-#if defined (CONFIG_MEMCPY_PRE_INC_PTRS)
-
-# define START_VAL(x) (x)--
-# define INC_VAL(x) *++(x)
-# define CAST_TO_U8(p, o) ((uint8_t*)p + o + TYPE_WIDTH)
-# define WHILE_DEST_BREAK (TYPE_WIDTH - 1)
-# define PRE_LOOP_ADJUST - (TYPE_WIDTH - 1)
-# define PRE_SWITCH_ADJUST + 1
-
-#else /* CONFIG_MEMCPY_PRE_INC_PTRS */
-
-# define START_VAL(x)
-# define INC_VAL(x) *(x)++
-# define CAST_TO_U8(p, o) ((uint8_t*)p + o)
-# define WHILE_DEST_BREAK 0
-# define PRE_LOOP_ADJUST
-# define PRE_SWITCH_ADJUST
-
-#endif /* CONFIG_MEMCPY_PRE_INC_PTRS */
-
-/* Definitions for endian-ness */
-
-#ifdef CONFIG_ENDIAN_BIG
-
-# define SHL <<
-# define SHR >>
-
-#else /* CONFIG_ENDIAN_BIG */
-
-# define SHL >>
-# define SHR <<
-
-#endif /* CONFIG_ENDIAN_BIG */
-
-/********************************************************************
- * Macros for copying words of different alignment.
- * Uses incremening pointers.
- *******************************************************************/
-
-#define CP_INCR() \
-{ \
- INC_VAL(dstN) = INC_VAL(srcN); \
-}
-
-#define CP_INCR_SH(shl, shr) \
-{ \
- dstWord = srcWord SHL shl; \
- srcWord = INC_VAL(srcN); \
- dstWord |= srcWord SHR shr; \
- INC_VAL(dstN) = dstWord; \
-}
-
-/********************************************************************
- * Macros for copying words of different alignment.
- * Uses array indexes.
- *******************************************************************/
-
-#define CP_INDEX(idx) \
-{ \
- dstN[idx] = srcN[idx]; \
-}
-
-#define CP_INDEX_SH(x, shl, shr) \
-{ \
- dstWord = srcWord SHL shl; \
- srcWord = srcN[x]; \
- dstWord |= srcWord SHR shr; \
- dstN[x] = dstWord; \
-}
-
-/********************************************************************
- * Macros for copying words of different alignment.
- * Uses incremening pointers or array indexes depending on
- * configuration.
- *******************************************************************/
-
-#if defined (CONFIG_MEMCPY_INDEXED_COPY)
-
-# define CP(idx) CP_INDEX(idx)
-# define CP_SH(idx, shl, shr) CP_INDEX_SH(idx, shl, shr)
-
-# define INC_INDEX(p, o) ((p) += (o))
-
-#else /* CONFIG_MEMCPY_INDEXED_COPY */
-
-# define CP(idx) CP_INCR()
-# define CP_SH(idx, shl, shr) CP_INCR_SH(shl, shr)
-
-# define INC_INDEX(p, o)
-
-#endif /* CONFIG_MEMCPY_INDEXED_COPY */
-
-#define COPY_REMAINING(count) \
-{ \
- START_VAL(dst8); \
- START_VAL(src8); \
- \
- switch (count) \
- { \
- case 7: INC_VAL(dst8) = INC_VAL(src8); \
- case 6: INC_VAL(dst8) = INC_VAL(src8); \
- case 5: INC_VAL(dst8) = INC_VAL(src8); \
- case 4: INC_VAL(dst8) = INC_VAL(src8); \
- case 3: INC_VAL(dst8) = INC_VAL(src8); \
- case 2: INC_VAL(dst8) = INC_VAL(src8); \
- case 1: INC_VAL(dst8) = INC_VAL(src8); \
- case 0: \
- default: break; \
- } \
-}
-
-#define COPY_NO_SHIFT() \
-{ \
- UIntN* dstN = (UIntN*)(dst8 PRE_LOOP_ADJUST); \
- UIntN* srcN = (UIntN*)(src8 PRE_LOOP_ADJUST); \
- size_t length = count / TYPE_WIDTH; \
- \
- while (length & 7) \
- { \
- CP_INCR(); \
- length--; \
- } \
- \
- length /= 8; \
- \
- while (length--) \
- { \
- CP(0); \
- CP(1); \
- CP(2); \
- CP(3); \
- CP(4); \
- CP(5); \
- CP(6); \
- CP(7); \
- \
- INC_INDEX(dstN, 8); \
- INC_INDEX(srcN, 8); \
- } \
- \
- src8 = CAST_TO_U8(srcN, 0); \
- dst8 = CAST_TO_U8(dstN, 0); \
- \
- COPY_REMAINING(count & (TYPE_WIDTH - 1)); \
- \
- return dest; \
-}
-
-#define COPY_SHIFT(shift) \
-{ \
- UIntN* dstN = (UIntN*)((((UIntN)dst8) PRE_LOOP_ADJUST) & \
- ~(TYPE_WIDTH - 1)); \
- UIntN* srcN = (UIntN*)((((UIntN)src8) PRE_LOOP_ADJUST) & \
- ~(TYPE_WIDTH - 1)); \
- size_t length = count / TYPE_WIDTH; \
- UIntN srcWord = INC_VAL(srcN); \
- UIntN dstWord; \
- \
- while (length & 7) \
- { \
- CP_INCR_SH(8 * shift, 8 * (TYPE_WIDTH - shift)); \
- length--; \
- } \
- \
- length /= 8; \
- \
- while (length--) \
- { \
- CP_SH(0, 8 * shift, 8 * (TYPE_WIDTH - shift)); \
- CP_SH(1, 8 * shift, 8 * (TYPE_WIDTH - shift)); \
- CP_SH(2, 8 * shift, 8 * (TYPE_WIDTH - shift)); \
- CP_SH(3, 8 * shift, 8 * (TYPE_WIDTH - shift)); \
- CP_SH(4, 8 * shift, 8 * (TYPE_WIDTH - shift)); \
- CP_SH(5, 8 * shift, 8 * (TYPE_WIDTH - shift)); \
- CP_SH(6, 8 * shift, 8 * (TYPE_WIDTH - shift)); \
- CP_SH(7, 8 * shift, 8 * (TYPE_WIDTH - shift)); \
- \
- INC_INDEX(dstN, 8); \
- INC_INDEX(srcN, 8); \
- } \
- \
- src8 = CAST_TO_U8(srcN, (shift - TYPE_WIDTH)); \
- dst8 = CAST_TO_U8(dstN, 0); \
- \
- COPY_REMAINING(count & (TYPE_WIDTH - 1)); \
- \
- return dest; \
-}
-
-/********************************************************************
- * Type Definitions
- *******************************************************************/
-
-#ifdef CONFIG_MEMCPY_64BIT
-typedef uint64_t UIntN;
-# define TYPE_WIDTH 8L
-#else
-typedef uint32_t UIntN;
-# define TYPE_WIDTH 4L
-#endif
-
-/********************************************************************
- * Public Functions
- *******************************************************************/
-/********************************************************************
- * Name: memcpy
- *
- * Description:
- * Copies count bytes from src to dest. No overlap check is performed.
- *
- * Input Parameters:
- * dest - pointer to destination buffer
- * src - pointer to source buffer
- * count - number of bytes to copy
- *
- * Returned Value:
- * A pointer to destination buffer
- *
- *******************************************************************/
-
-void *memcpy(void *dest, const void *src, size_t count)
-{
- uint8_t *dst8 = (uint8_t*)dest;
- uint8_t *src8 = (uint8_t*)src;
-
- if (count < 8)
- {
- COPY_REMAINING(count);
- return dest;
- }
-
- START_VAL(dst8);
- START_VAL(src8);
-
- while (((UIntN)dst8 & (TYPE_WIDTH - 1)) != WHILE_DEST_BREAK)
- {
- INC_VAL(dst8) = INC_VAL(src8);
- count--;
- }
-
- switch ((((UIntN)src8) PRE_SWITCH_ADJUST) & (TYPE_WIDTH - 1))
- {
- case 0: COPY_NO_SHIFT(); break;
- case 1: COPY_SHIFT(1); break;
- case 2: COPY_SHIFT(2); break;
- case 3: COPY_SHIFT(3); break;
-#if TYPE_WIDTH > 4
- case 4: COPY_SHIFT(4); break;
- case 5: COPY_SHIFT(5); break;
- case 6: COPY_SHIFT(6); break;
- case 7: COPY_SHIFT(7); break;
-#endif
- }
-
- return dest;
-}
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