Commit b520b85a authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds
Browse files

i386: Move all simple string operations out of line 



The compiler generally generates reasonable inline code for the simple
cases and for the rest it's better for code size for them to be out of line.
Also there they can be potentially optimized more in the future.

In fact they probably should be in a .S file because they're all pure
assembly, but that's for another day.

Also some code style cleanup on them while I was on it (this seems
to be the last untouched really early Linux code)

This saves ~12k text for a defconfig kernel with gcc 4.1.

Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent aac57f81

arch/i386/lib/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -4,7 +4,7 @@ 




lib-y = checksum.o delay.o usercopy.o getuser.o putuser.o memcpy.o strstr.o \

	bitops.o semaphore.o

	bitops.o semaphore.o string.o



lib-$(CONFIG_X86_USE_3DNOW) += mmx.o

arch/i386/lib/string.c

0 → 100644
+257 −0
Original line number Diff line number Diff line 
/*

 * Most of the string-functions are rather heavily hand-optimized,

 * see especially strsep,strstr,str[c]spn. They should work, but are not

 * very easy to understand. Everything is done entirely within the register

 * set, making the functions fast and clean. String instructions have been

 * used through-out, making for "slightly" unclear code :-)

 *

 * AK: On P4 and K7 using non string instruction implementations might be faster

 * for large memory blocks. But most of them are unlikely to be used on large

 * strings.

 */



#include <linux/string.h>

#include <linux/module.h>



#ifdef __HAVE_ARCH_STRCPY

char *strcpy(char * dest,const char *src)

{

	int d0, d1, d2;

	asm volatile( "1:\tlodsb\n\t"

		"stosb\n\t"

		"testb %%al,%%al\n\t"

		"jne 1b"

		: "=&S" (d0), "=&D" (d1), "=&a" (d2)

		:"0" (src),"1" (dest) : "memory");

	return dest;

}

EXPORT_SYMBOL(strcpy);

#endif



#ifdef __HAVE_ARCH_STRNCPY

char *strncpy(char * dest,const char *src,size_t count)

{

	int d0, d1, d2, d3;

	asm volatile( "1:\tdecl %2\n\t"

		"js 2f\n\t"

		"lodsb\n\t"

		"stosb\n\t"

		"testb %%al,%%al\n\t"

		"jne 1b\n\t"

		"rep\n\t"

		"stosb\n"

		"2:"

		: "=&S" (d0), "=&D" (d1), "=&c" (d2), "=&a" (d3)

		:"0" (src),"1" (dest),"2" (count) : "memory");

	return dest;

}

EXPORT_SYMBOL(strncpy);

#endif



#ifdef __HAVE_ARCH_STRCAT

char *strcat(char * dest,const char * src)

{

	int d0, d1, d2, d3;

	asm volatile( "repne\n\t"

		"scasb\n\t"

		"decl %1\n"

		"1:\tlodsb\n\t"

		"stosb\n\t"

		"testb %%al,%%al\n\t"

		"jne 1b"

		: "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3)

		: "0" (src), "1" (dest), "2" (0), "3" (0xffffffffu): "memory");

	return dest;

}

EXPORT_SYMBOL(strcat);

#endif



#ifdef __HAVE_ARCH_STRNCAT

char *strncat(char * dest,const char * src,size_t count)

{

	int d0, d1, d2, d3;

	asm volatile( "repne\n\t"

		"scasb\n\t"

		"decl %1\n\t"

		"movl %8,%3\n"

		"1:\tdecl %3\n\t"

		"js 2f\n\t"

		"lodsb\n\t"

		"stosb\n\t"

		"testb %%al,%%al\n\t"

		"jne 1b\n"

		"2:\txorl %2,%2\n\t"

		"stosb"

		: "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3)

		: "0" (src),"1" (dest),"2" (0),"3" (0xffffffffu), "g" (count)

		: "memory");

	return dest;

}

EXPORT_SYMBOL(strncat);

#endif



#ifdef __HAVE_ARCH_STRCMP

int strcmp(const char * cs,const char * ct)

{

	int d0, d1;

	int res;

	asm volatile( "1:\tlodsb\n\t"

		"scasb\n\t"

		"jne 2f\n\t"

		"testb %%al,%%al\n\t"

		"jne 1b\n\t"

		"xorl %%eax,%%eax\n\t"

		"jmp 3f\n"

		"2:\tsbbl %%eax,%%eax\n\t"

		"orb $1,%%al\n"

		"3:"

		:"=a" (res), "=&S" (d0), "=&D" (d1)

		:"1" (cs),"2" (ct)

		:"memory");

	return res;

}

EXPORT_SYMBOL(strcmp);

#endif



#ifdef __HAVE_ARCH_STRNCMP

int strncmp(const char * cs,const char * ct,size_t count)

{

	int res;

	int d0, d1, d2;

	asm volatile( "1:\tdecl %3\n\t"

		"js 2f\n\t"

		"lodsb\n\t"

		"scasb\n\t"

		"jne 3f\n\t"

		"testb %%al,%%al\n\t"

		"jne 1b\n"

		"2:\txorl %%eax,%%eax\n\t"

		"jmp 4f\n"

		"3:\tsbbl %%eax,%%eax\n\t"

		"orb $1,%%al\n"

		"4:"

		:"=a" (res), "=&S" (d0), "=&D" (d1), "=&c" (d2)

		:"1" (cs),"2" (ct),"3" (count)

		:"memory");

	return res;

}

EXPORT_SYMBOL(strncmp);

#endif



#ifdef __HAVE_ARCH_STRCHR

char *strchr(const char * s, int c)

{

	int d0;

	char * res;

	asm volatile( "movb %%al,%%ah\n"

		"1:\tlodsb\n\t"

		"cmpb %%ah,%%al\n\t"

		"je 2f\n\t"

		"testb %%al,%%al\n\t"

		"jne 1b\n\t"

		"movl $1,%1\n"

		"2:\tmovl %1,%0\n\t"

		"decl %0"

		:"=a" (res), "=&S" (d0)

		:"1" (s),"0" (c)

		:"memory");

	return res;

}

EXPORT_SYMBOL(strchr);

#endif



#ifdef __HAVE_ARCH_STRRCHR

char *strrchr(const char * s, int c)

{

	int d0, d1;

	char * res;

	asm volatile( "movb %%al,%%ah\n"

		"1:\tlodsb\n\t"

		"cmpb %%ah,%%al\n\t"

		"jne 2f\n\t"

		"leal -1(%%esi),%0\n"

		"2:\ttestb %%al,%%al\n\t"

		"jne 1b"

		:"=g" (res), "=&S" (d0), "=&a" (d1)

		:"0" (0),"1" (s),"2" (c)

		:"memory");

	return res;

}

EXPORT_SYMBOL(strrchr);

#endif



#ifdef __HAVE_ARCH_STRLEN

size_t strlen(const char * s)

{

	int d0;

	int res;

	asm volatile( "repne\n\t"

		"scasb\n\t"

		"notl %0\n\t"

		"decl %0"

		:"=c" (res), "=&D" (d0)

		:"1" (s),"a" (0), "0" (0xffffffffu)

		:"memory");

	return res;

}

EXPORT_SYMBOL(strlen);

#endif



#ifdef __HAVE_ARCH_MEMCHR

void *memchr(const void *cs,int c,size_t count)

{

	int d0;

	void *res;

	if (!count)

		return NULL;

	asm volatile( "repne\n\t"

		"scasb\n\t"

		"je 1f\n\t"

		"movl $1,%0\n"

		"1:\tdecl %0"

		:"=D" (res), "=&c" (d0)

		:"a" (c),"0" (cs),"1" (count)

		:"memory");

	return res;

}

EXPORT_SYMBOL(memchr);

#endif



#ifdef __HAVE_ARCH_MEMSCAN

void *memscan(void * addr, int c, size_t size)

{

	if (!size)

		return addr;

	asm volatile("repnz; scasb\n\t"

	    "jnz 1f\n\t"

	    "dec %%edi\n"

	    "1:"

	    : "=D" (addr), "=c" (size)

	    : "0" (addr), "1" (size), "a" (c)

	    : "memory");

	return addr;

}

EXPORT_SYMBOL(memscan);

#endif



#ifdef __HAVE_ARCH_STRNLEN

size_t strnlen(const char *s, size_t count)

{

	int d0;

	int res;

	asm volatile( "movl %2,%0\n\t"

		"jmp 2f\n"

		"1:\tcmpb $0,(%0)\n\t"

		"je 3f\n\t"

		"incl %0\n"

		"2:\tdecl %1\n\t"

		"cmpl $-1,%1\n\t"

		"jne 1b\n"

		"3:\tsubl %2,%0"

		:"=a" (res), "=&d" (d0)

		:"c" (s),"1" (count)

		:"memory");

	return res;

}

EXPORT_SYMBOL(strnlen);

#endif

include/asm-i386/string.h

+13 −230
Original line number Diff line number Diff line
@@ -2,203 +2,35 @@ 
#define _I386_STRING_H_



#ifdef __KERNEL__

/*

 * On a 486 or Pentium, we are better off not using the

 * byte string operations. But on a 386 or a PPro the

 * byte string ops are faster than doing it by hand

 * (MUCH faster on a Pentium).

 */



/*

 * This string-include defines all string functions as inline

 * functions. Use gcc. It also assumes ds=es=data space, this should be

 * normal. Most of the string-functions are rather heavily hand-optimized,

 * see especially strsep,strstr,str[c]spn. They should work, but are not

 * very easy to understand. Everything is done entirely within the register

 * set, making the functions fast and clean. String instructions have been

 * used through-out, making for "slightly" unclear code :-)

 *

 *		NO Copyright (C) 1991, 1992 Linus Torvalds,

 *		consider these trivial functions to be PD.

 */



/* AK: in fact I bet it would be better to move this stuff all out of line.

 */

/* Let gcc decide wether to inline or use the out of line functions */



#define __HAVE_ARCH_STRCPY

static inline char * strcpy(char * dest,const char *src)

{

int d0, d1, d2;

__asm__ __volatile__(

	"1:\tlodsb\n\t"

	"stosb\n\t"

	"testb %%al,%%al\n\t"

	"jne 1b"

	: "=&S" (d0), "=&D" (d1), "=&a" (d2)

	:"0" (src),"1" (dest) : "memory");

return dest;

}

extern char *strcpy(char *dest, const char *src);



#define __HAVE_ARCH_STRNCPY

static inline char * strncpy(char * dest,const char *src,size_t count)

{

int d0, d1, d2, d3;

__asm__ __volatile__(

	"1:\tdecl %2\n\t"

	"js 2f\n\t"

	"lodsb\n\t"

	"stosb\n\t"

	"testb %%al,%%al\n\t"

	"jne 1b\n\t"

	"rep\n\t"

	"stosb\n"

	"2:"

	: "=&S" (d0), "=&D" (d1), "=&c" (d2), "=&a" (d3)

	:"0" (src),"1" (dest),"2" (count) : "memory");

return dest;

}

extern char *strncpy(char *dest, const char *src, size_t count);



#define __HAVE_ARCH_STRCAT

static inline char * strcat(char * dest,const char * src)

{

int d0, d1, d2, d3;

__asm__ __volatile__(

	"repne\n\t"

	"scasb\n\t"

	"decl %1\n"

	"1:\tlodsb\n\t"

	"stosb\n\t"

	"testb %%al,%%al\n\t"

	"jne 1b"

	: "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3)

	: "0" (src), "1" (dest), "2" (0), "3" (0xffffffffu):"memory");

return dest;

}

extern char *strcat(char *dest, const char *src);



#define __HAVE_ARCH_STRNCAT

static inline char * strncat(char * dest,const char * src,size_t count)

{

int d0, d1, d2, d3;

__asm__ __volatile__(

	"repne\n\t"

	"scasb\n\t"

	"decl %1\n\t"

	"movl %8,%3\n"

	"1:\tdecl %3\n\t"

	"js 2f\n\t"

	"lodsb\n\t"

	"stosb\n\t"

	"testb %%al,%%al\n\t"

	"jne 1b\n"

	"2:\txorl %2,%2\n\t"

	"stosb"

	: "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3)

	: "0" (src),"1" (dest),"2" (0),"3" (0xffffffffu), "g" (count)

	: "memory");

return dest;

}

extern char *strncat(char *dest, const char *src, size_t count);



#define __HAVE_ARCH_STRCMP

static inline int strcmp(const char * cs,const char * ct)

{

int d0, d1;

register int __res;

__asm__ __volatile__(

	"1:\tlodsb\n\t"

	"scasb\n\t"

	"jne 2f\n\t"

	"testb %%al,%%al\n\t"

	"jne 1b\n\t"

	"xorl %%eax,%%eax\n\t"

	"jmp 3f\n"

	"2:\tsbbl %%eax,%%eax\n\t"

	"orb $1,%%al\n"

	"3:"

	:"=a" (__res), "=&S" (d0), "=&D" (d1)

	:"1" (cs),"2" (ct)

	:"memory");

return __res;

}

extern int strcmp(const char *cs, const char *ct);



#define __HAVE_ARCH_STRNCMP

static inline int strncmp(const char * cs,const char * ct,size_t count)

{

register int __res;

int d0, d1, d2;

__asm__ __volatile__(

	"1:\tdecl %3\n\t"

	"js 2f\n\t"

	"lodsb\n\t"

	"scasb\n\t"

	"jne 3f\n\t"

	"testb %%al,%%al\n\t"

	"jne 1b\n"

	"2:\txorl %%eax,%%eax\n\t"

	"jmp 4f\n"

	"3:\tsbbl %%eax,%%eax\n\t"

	"orb $1,%%al\n"

	"4:"

	:"=a" (__res), "=&S" (d0), "=&D" (d1), "=&c" (d2)

	:"1" (cs),"2" (ct),"3" (count)

	:"memory");

return __res;

}

extern int strncmp(const char *cs, const char *ct, size_t count);



#define __HAVE_ARCH_STRCHR

static inline char * strchr(const char * s, int c)

{

int d0;

register char * __res;

__asm__ __volatile__(

	"movb %%al,%%ah\n"

	"1:\tlodsb\n\t"

	"cmpb %%ah,%%al\n\t"

	"je 2f\n\t"

	"testb %%al,%%al\n\t"

	"jne 1b\n\t"

	"movl $1,%1\n"

	"2:\tmovl %1,%0\n\t"

	"decl %0"

	:"=a" (__res), "=&S" (d0)

	:"1" (s),"0" (c)

	:"memory");

return __res;

}

extern char *strchr(const char *s, int c);



#define __HAVE_ARCH_STRRCHR

static inline char * strrchr(const char * s, int c)

{

int d0, d1;

register char * __res;

__asm__ __volatile__(

	"movb %%al,%%ah\n"

	"1:\tlodsb\n\t"

	"cmpb %%ah,%%al\n\t"

	"jne 2f\n\t"

	"leal -1(%%esi),%0\n"

	"2:\ttestb %%al,%%al\n\t"

	"jne 1b"

	:"=g" (__res), "=&S" (d0), "=&a" (d1)

	:"0" (0),"1" (s),"2" (c)

	:"memory");

return __res;

}

extern char *strrchr(const char *s, int c);



#define __HAVE_ARCH_STRLEN

static inline size_t strlen(const char * s)

{

int d0;

register int __res;

__asm__ __volatile__(

	"repne\n\t"

	"scasb\n\t"

	"notl %0\n\t"

	"decl %0"

	:"=c" (__res), "=&D" (d0)

	:"1" (s),"a" (0), "0" (0xffffffffu)

	:"memory");

return __res;

}

extern size_t strlen(const char *s);



static __always_inline void * __memcpy(void * to, const void * from, size_t n)

{
@@ -207,9 +39,7 @@ __asm__ __volatile__( 
	"rep ; movsl\n\t"

	"movl %4,%%ecx\n\t"

	"andl $3,%%ecx\n\t"

#if 1	/* want to pay 2 byte penalty for a chance to skip microcoded rep? */

	"jz 1f\n\t"

#endif

	"rep ; movsb\n\t"

	"1:"

	: "=&c" (d0), "=&D" (d1), "=&S" (d2)
@@ -328,23 +158,7 @@ void *memmove(void * dest,const void * src, size_t n); 
#define memcmp __builtin_memcmp



#define __HAVE_ARCH_MEMCHR

static inline void * memchr(const void * cs,int c,size_t count)

{

int d0;

register void * __res;

if (!count)

	return NULL;

__asm__ __volatile__(

	"repne\n\t"

	"scasb\n\t"

	"je 1f\n\t"

	"movl $1,%0\n"

	"1:\tdecl %0"

	:"=D" (__res), "=&c" (d0)

	:"a" (c),"0" (cs),"1" (count)

	:"memory");

return __res;

}

extern void *memchr(const void * cs,int c,size_t count);



static inline void * __memset_generic(void * s, char c,size_t count)

{
@@ -386,29 +200,10 @@ return (s); 


/* Added by Gertjan van Wingerde to make minix and sysv module work */

#define __HAVE_ARCH_STRNLEN

static inline size_t strnlen(const char * s, size_t count)

{

int d0;

register int __res;

__asm__ __volatile__(

	"movl %2,%0\n\t"

	"jmp 2f\n"

	"1:\tcmpb $0,(%0)\n\t"

	"je 3f\n\t"

	"incl %0\n"

	"2:\tdecl %1\n\t"

	"cmpl $-1,%1\n\t"

	"jne 1b\n"

	"3:\tsubl %2,%0"

	:"=a" (__res), "=&d" (d0)

	:"c" (s),"1" (count)

	:"memory");

return __res;

}

extern size_t strnlen(const char * s, size_t count);

/* end of additional stuff */



#define __HAVE_ARCH_STRSTR



extern char *strstr(const char *cs, const char *ct);



/*
@@ -474,19 +269,7 @@ __asm__ __volatile__( \ 
 * find the first occurrence of byte 'c', or 1 past the area if none

 */

#define __HAVE_ARCH_MEMSCAN

static inline void * memscan(void * addr, int c, size_t size)

{

	if (!size)

		return addr;

	__asm__("repnz; scasb\n\t"

		"jnz 1f\n\t"

		"dec %%edi\n"

		"1:"

		: "=D" (addr), "=c" (size)

		: "0" (addr), "1" (size), "a" (c)

		: "memory");

	return addr;

}

extern void *memscan(void * addr, int c, size_t size);



#endif /* __KERNEL__ */

CRA Git | Maintained and supported by SUSTech CRA and CCSE