Linux kernel mirror (for testing)
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linux
1#ifndef _X86_64_STRING_H_
2#define _X86_64_STRING_H_
3
4#ifdef __KERNEL__
5
6/* Written 2002 by Andi Kleen */
7
8/* Only used for special circumstances. Stolen from i386/string.h */
9static inline void * __inline_memcpy(void * to, const void * from, size_t n)
10{
11unsigned long d0, d1, d2;
12__asm__ __volatile__(
13 "rep ; movsl\n\t"
14 "testb $2,%b4\n\t"
15 "je 1f\n\t"
16 "movsw\n"
17 "1:\ttestb $1,%b4\n\t"
18 "je 2f\n\t"
19 "movsb\n"
20 "2:"
21 : "=&c" (d0), "=&D" (d1), "=&S" (d2)
22 :"0" (n/4), "q" (n),"1" ((long) to),"2" ((long) from)
23 : "memory");
24return (to);
25}
26
27/* Even with __builtin_ the compiler may decide to use the out of line
28 function. */
29
30#define __HAVE_ARCH_MEMCPY 1
31extern void *__memcpy(void *to, const void *from, size_t len);
32#define memcpy(dst,src,len) \
33 ({ size_t __len = (len); \
34 void *__ret; \
35 if (__builtin_constant_p(len) && __len >= 64) \
36 __ret = __memcpy((dst),(src),__len); \
37 else \
38 __ret = __builtin_memcpy((dst),(src),__len); \
39 __ret; })
40
41
42#define __HAVE_ARCH_MEMSET
43#define memset __builtin_memset
44
45#define __HAVE_ARCH_MEMMOVE
46void * memmove(void * dest,const void *src,size_t count);
47
48/* Use C out of line version for memcmp */
49#define memcmp __builtin_memcmp
50int memcmp(const void * cs,const void * ct,size_t count);
51
52/* out of line string functions use always C versions */
53#define strlen __builtin_strlen
54size_t strlen(const char * s);
55
56#define strcpy __builtin_strcpy
57char * strcpy(char * dest,const char *src);
58
59#define strcat __builtin_strcat
60char * strcat(char * dest, const char * src);
61
62#define strcmp __builtin_strcmp
63int strcmp(const char * cs,const char * ct);
64
65#endif /* __KERNEL__ */
66
67#endif