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aac57f81eb
Jan asked to always use the builtin memcpy on gcc 4.3 mainline because it should generate better code than the old macro. Let's try it. Cc: Jan Hubicka <jh@suse.cz> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
#ifndef _X86_64_STRING_H_
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#define _X86_64_STRING_H_
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#ifdef __KERNEL__
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/* Written 2002 by Andi Kleen */
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/* Only used for special circumstances. Stolen from i386/string.h */
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static __always_inline void *
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__inline_memcpy(void * to, const void * from, size_t n)
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{
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unsigned long d0, d1, d2;
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__asm__ __volatile__(
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"rep ; movsl\n\t"
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"testb $2,%b4\n\t"
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"je 1f\n\t"
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"movsw\n"
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"1:\ttestb $1,%b4\n\t"
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"je 2f\n\t"
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"movsb\n"
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"2:"
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: "=&c" (d0), "=&D" (d1), "=&S" (d2)
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:"0" (n/4), "q" (n),"1" ((long) to),"2" ((long) from)
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: "memory");
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return (to);
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}
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/* Even with __builtin_ the compiler may decide to use the out of line
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function. */
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#define __HAVE_ARCH_MEMCPY 1
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#if (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4
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extern void *memcpy(void *to, const void *from, size_t len);
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#else
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extern void *__memcpy(void *to, const void *from, size_t len);
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#define memcpy(dst,src,len) \
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({ size_t __len = (len); \
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void *__ret; \
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if (__builtin_constant_p(len) && __len >= 64) \
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__ret = __memcpy((dst),(src),__len); \
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else \
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__ret = __builtin_memcpy((dst),(src),__len); \
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__ret; })
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#endif
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#define __HAVE_ARCH_MEMSET
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void *memset(void *s, int c, size_t n);
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#define __HAVE_ARCH_MEMMOVE
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void * memmove(void * dest,const void *src,size_t count);
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int memcmp(const void * cs,const void * ct,size_t count);
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size_t strlen(const char * s);
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char *strcpy(char * dest,const char *src);
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char *strcat(char * dest, const char * src);
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int strcmp(const char * cs,const char * ct);
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#endif /* __KERNEL__ */
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#endif
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