patch-1.3.69 linux/include/asm-i386/string-486.h

• Lines: 694
• Date: Mon Feb 26 11:58:16 1996
• Orig file: v1.3.68/linux/include/asm-i386/string-486.h
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.68/linux/include/asm-i386/string-486.h linux/include/asm-i386/string-486.h
@@ -0,0 +1,693 @@
+#ifndef _I386_STRING_I486_H_
+#define _I386_STRING_I486_H_
+
+/*
+ * 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 strtok,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. 
+ *
+ *		Copyright (C) 1991, 1992 Linus Torvalds
+ *		Revised and optimized for i486/pentium
+ *		1994/03/15 by Alberto Vignani/Davide Parodi @crf.it
+ *
+ *	Split into 2 CPU specific files by Alan Cox to keep #ifdef noise down.
+ */
+
+#define __HAVE_ARCH_STRCPY
+extern inline char * strcpy(char * dest,const char *src)
+{
+register char *tmp= (char *)dest;
+register char dummy;
+__asm__ __volatile__(
+	"\n1:\t"
+	"movb (%0),%2\n\t"
+	"incl %0\n\t"
+	"movb %2,(%1)\n\t"
+	"incl %1\n\t"
+	"testb %2,%2\n\t"
+	"jne 1b"
+	:"=r" (src), "=r" (tmp), "=q" (dummy)
+	:"0" (src), "1" (tmp)
+	:"memory");
+return dest;
+}
+
+#define __HAVE_ARCH_STRNCPY
+extern inline char * strncpy(char * dest,const char *src,size_t count)
+{
+register char *tmp= (char *)dest;
+register char dummy;
+if (count) {
+__asm__ __volatile__(
+	"\n1:\t"
+	"movb (%0),%2\n\t"
+	"incl %0\n\t"
+	"movb %2,(%1)\n\t"
+	"incl %1\n\t"
+	"decl %3\n\t"
+	"je 3f\n\t"
+	"testb %2,%2\n\t"
+	"jne 1b\n\t"
+	"2:\tmovb %2,(%1)\n\t"
+	"incl %1\n\t"
+	"decl %3\n\t"
+	"jne 2b\n\t"
+	"3:"
+	:"=r" (src), "=r" (tmp), "=q" (dummy), "=r" (count)
+	:"0" (src), "1" (tmp), "3" (count)
+	:"memory");
+    } /* if (count) */
+return dest;
+}
+
+#define __HAVE_ARCH_STRCAT
+extern inline char * strcat(char * dest,const char * src)
+{
+register char *tmp = (char *)(dest-1);
+register char dummy;
+__asm__ __volatile__(
+	"\n1:\tincl %1\n\t"
+	"cmpb $0,(%1)\n\t"
+	"jne 1b\n"
+	"2:\tmovb (%2),%b0\n\t"
+	"incl %2\n\t"
+	"movb %b0,(%1)\n\t"
+	"incl %1\n\t"
+	"testb %b0,%b0\n\t"
+	"jne 2b\n"
+	:"=q" (dummy), "=r" (tmp), "=r" (src)
+	:"1"  (tmp), "2"  (src)
+	:"memory");
+return dest;
+}
+
+#define __HAVE_ARCH_STRNCAT
+extern inline char * strncat(char * dest,const char * src,size_t count)
+{
+register char *tmp = (char *)(dest-1);
+register char dummy;
+__asm__ __volatile__(
+	"\n1:\tincl %1\n\t"
+	"cmpb $0,(%1)\n\t"
+	"jne 1b\n"
+	"2:\tdecl %3\n\t"
+	"js 3f\n\t"
+	"movb (%2),%b0\n\t"
+	"incl %2\n\t"
+	"movb %b0,(%1)\n\t"
+	"incl %1\n\t"
+	"testb %b0,%b0\n\t"
+	"jne 2b\n"
+	"3:\txorl %0,%0\n\t"
+	"movb %b0,(%1)\n\t"
+	:"=q" (dummy), "=r" (tmp), "=r" (src), "=r" (count)
+	:"1"  (tmp), "2"  (src), "3"  (count)
+	:"memory");
+return dest;
+}
+
+#define __HAVE_ARCH_STRCMP
+extern inline int strcmp(const char * cs,const char * ct)
+{
+register int __res;
+__asm__ __volatile__(
+	"\n1:\tmovb (%1),%b0\n\t"
+	"incl %1\n\t"
+	"cmpb %b0,(%2)\n\t"
+	"jne 2f\n\t"
+	"incl %2\n\t"
+	"testb %b0,%b0\n\t"
+	"jne 1b\n\t"
+	"xorl %0,%0\n\t"
+	"jmp 3f\n"
+	"2:\tmovl $1,%0\n\t"
+	"jb 3f\n\t"
+	"negl %0\n"
+	"3:"
+	:"=q" (__res), "=r" (cs), "=r" (ct)
+	:"1" (cs), "2" (ct)
+	: "memory" );
+return __res;
+}
+
+#define __HAVE_ARCH_STRNCMP
+extern inline int strncmp(const char * cs,const char * ct,size_t count)
+{
+register int __res;
+__asm__ __volatile__(
+	"\n1:\tdecl %3\n\t"
+	"js 2f\n\t"
+	"movb (%1),%b0\n\t"
+	"incl %1\n\t"
+	"cmpb %b0,(%2)\n\t"
+	"jne 3f\n\t"
+	"incl %2\n\t"
+	"testb %b0,%b0\n\t"
+	"jne 1b\n"
+	"2:\txorl %0,%0\n\t"
+	"jmp 4f\n"
+	"3:\tmovl $1,%0\n\t"
+	"jb 4f\n\t"
+	"negl %0\n"
+	"4:"
+	:"=q" (__res), "=r" (cs), "=r" (ct), "=r" (count)
+	:"1"  (cs), "2"  (ct),  "3" (count));
+return __res;
+}
+
+#define __HAVE_ARCH_STRCHR
+extern inline char * strchr(const char * s, int c)
+{
+register char * __res;
+__asm__ __volatile__(
+	"movb %%al,%%ah\n"
+	"1:\tmovb (%1),%%al\n\t"
+	"cmpb %%ah,%%al\n\t"
+	"je 2f\n\t"
+	"incl %1\n\t"
+	"testb %%al,%%al\n\t"
+	"jne 1b\n\t"
+	"xorl %1,%1\n"
+	"2:\tmovl %1,%0\n\t"
+	:"=a" (__res), "=r" (s)
+	:"0" (c),      "1"  (s));
+return __res;
+}
+
+#define __HAVE_ARCH_STRRCHR
+extern inline char * strrchr(const char * s, int c)
+{
+register char * __res;
+__asm__ __volatile__(
+	"cld\n\t"
+	"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"
+	:"=d" (__res):"0" (0),"S" (s),"a" (c):"ax","si");
+return __res;
+}
+
+#define __HAVE_ARCH_STRSPN
+extern inline size_t strspn(const char * cs, const char * ct)
+{
+register char * __res;
+__asm__ __volatile__(
+	"cld\n\t"
+	"movl %4,%%edi\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"notl %%ecx\n\t"
+	"decl %%ecx\n\t"
+	"movl %%ecx,%%edx\n"
+	"1:\tlodsb\n\t"
+	"testb %%al,%%al\n\t"
+	"je 2f\n\t"
+	"movl %4,%%edi\n\t"
+	"movl %%edx,%%ecx\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"je 1b\n"
+	"2:\tdecl %0"
+	:"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
+	:"ax","cx","dx","di");
+return __res-cs;
+}
+
+#define __HAVE_ARCH_STRCSPN
+extern inline size_t strcspn(const char * cs, const char * ct)
+{
+register char * __res;
+__asm__ __volatile__(
+	"cld\n\t"
+	"movl %4,%%edi\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"notl %%ecx\n\t"
+	"decl %%ecx\n\t"
+	"movl %%ecx,%%edx\n"
+	"1:\tlodsb\n\t"
+	"testb %%al,%%al\n\t"
+	"je 2f\n\t"
+	"movl %4,%%edi\n\t"
+	"movl %%edx,%%ecx\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"jne 1b\n"
+	"2:\tdecl %0"
+	:"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
+	:"ax","cx","dx","di");
+return __res-cs;
+}
+
+#define __HAVE_ARCH_STRPBRK
+extern inline char * strpbrk(const char * cs,const char * ct)
+{
+register char * __res;
+__asm__ __volatile__(
+	"cld\n\t"
+	"movl %4,%%edi\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"notl %%ecx\n\t"
+	"decl %%ecx\n\t"
+	"movl %%ecx,%%edx\n"
+	"1:\tlodsb\n\t"
+	"testb %%al,%%al\n\t"
+	"je 2f\n\t"
+	"movl %4,%%edi\n\t"
+	"movl %%edx,%%ecx\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"jne 1b\n\t"
+	"decl %0\n\t"
+	"jmp 3f\n"
+	"2:\txorl %0,%0\n"
+	"3:"
+	:"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
+	:"ax","cx","dx","di");
+return __res;
+}
+
+#define __HAVE_ARCH_STRSTR
+extern inline char * strstr(const char * cs,const char * ct)
+{
+register char * __res;
+__asm__ __volatile__(
+	"cld\n\t" \
+	"movl %4,%%edi\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"notl %%ecx\n\t"
+	"decl %%ecx\n\t"	/* NOTE! This also sets Z if searchstring='' */
+	"movl %%ecx,%%edx\n"
+	"1:\tmovl %4,%%edi\n\t"
+	"movl %%esi,%%eax\n\t"
+	"movl %%edx,%%ecx\n\t"
+	"repe\n\t"
+	"cmpsb\n\t"
+	"je 2f\n\t"		/* also works for empty string, see above */
+	"xchgl %%eax,%%esi\n\t"
+	"incl %%esi\n\t"
+	"cmpb $0,-1(%%eax)\n\t"
+	"jne 1b\n\t"
+	"xorl %%eax,%%eax\n\t"
+	"2:"
+	:"=a" (__res):"0" (0),"c" (0xffffffff),"S" (cs),"g" (ct)
+	:"cx","dx","di","si");
+return __res;
+}
+
+#define __HAVE_ARCH_STRLEN
+extern inline size_t strlen(const char * s)
+{
+/*
+ * slightly slower on a 486, but with better chances of
+ * register allocation
+ */
+register char dummy, *tmp= (char *)s;
+__asm__ __volatile__(
+	"\n1:\t"
+	"movb\t(%0),%1\n\t"
+	"incl\t%0\n\t"
+	"testb\t%1,%1\n\t"
+	"jne\t1b"
+	:"=r" (tmp),"=q" (dummy)
+	:"0" (s)
+	: "memory" );
+return (tmp-s-1);
+}
+
+/* Added by Gertjan van Wingerde to make minix and sysv module work */
+#define __HAVE_ARCH_STRNLEN
+extern inline size_t strnlen(const char * s, size_t count)
+{
+register int __res;
+__asm__ __volatile__(
+	"movl %1,%0\n\t"
+	"jmp 2f\n"
+	"1:\tcmpb $0,(%0)\n\t"
+	"je 3f\n\t"
+	"incl %0\n"
+	"2:\tdecl %2\n\t"
+	"cmpl $-1,%2\n\t"
+	"jne 1b\n"
+	"3:\tsubl %1,%0"
+	:"=a" (__res):"c" (s),"d" (count));
+return __res;
+}
+/* end of additional stuff */
+
+#define __HAVE_ARCH_STRTOK
+extern inline char * strtok(char * s,const char * ct)
+{
+register char * __res;
+__asm__ __volatile__(
+	"testl %1,%1\n\t"
+	"jne 1f\n\t"
+	"testl %0,%0\n\t"
+	"je 8f\n\t"
+	"movl %0,%1\n"
+	"1:\txorl %0,%0\n\t"
+	"movl $-1,%%ecx\n\t"
+	"xorl %%eax,%%eax\n\t"
+	"cld\n\t"
+	"movl %4,%%edi\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"notl %%ecx\n\t"
+	"decl %%ecx\n\t"
+	"je 7f\n\t"			/* empty delimiter-string */
+	"movl %%ecx,%%edx\n"
+	"2:\tlodsb\n\t"
+	"testb %%al,%%al\n\t"
+	"je 7f\n\t"
+	"movl %4,%%edi\n\t"
+	"movl %%edx,%%ecx\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"je 2b\n\t"
+	"decl %1\n\t"
+	"cmpb $0,(%1)\n\t"
+	"je 7f\n\t"
+	"movl %1,%0\n"
+	"3:\tlodsb\n\t"
+	"testb %%al,%%al\n\t"
+	"je 5f\n\t"
+	"movl %4,%%edi\n\t"
+	"movl %%edx,%%ecx\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"jne 3b\n\t"
+	"decl %1\n\t"
+	"cmpb $0,(%1)\n\t"
+	"je 5f\n\t"
+	"movb $0,(%1)\n\t"
+	"incl %1\n\t"
+	"jmp 6f\n"
+	"5:\txorl %1,%1\n"
+	"6:\tcmpb $0,(%0)\n\t"
+	"jne 7f\n\t"
+	"xorl %0,%0\n"
+	"7:\ttestl %0,%0\n\t"
+	"jne 8f\n\t"
+	"movl %0,%1\n"
+	"8:"
+	:"=b" (__res),"=S" (___strtok)
+	:"0" (___strtok),"1" (s),"g" (ct)
+	:"ax","cx","dx","di","memory");
+return __res;
+}
+
+#define __memcpy_c(d,s,count) \
+((count%4==0) ? \
+ __memcpy_by4((d),(s),(count)) : \
+ ((count%2==0) ? \
+  __memcpy_by2((d),(s),(count)) : \
+  __memcpy_g((d),(s),(count))))
+
+#define __HAVE_ARCH_MEMCPY
+#define memcpy(d,s,count) \
+(__builtin_constant_p(count) ? \
+ __memcpy_c((d),(s),(count)) : \
+ __memcpy_g((d),(s),(count)))
+
+/*
+ *	These ought to get tweaked to do some cache priming.
+ */
+ 
+extern inline void * __memcpy_by4(void * to, const void * from, size_t n)
+{
+register void *tmp = (void *)to;
+register int dummy1,dummy2;
+__asm__ __volatile__ (
+	"\n1:\tmovl (%2),%0\n\t"
+	"addl $4,%2\n\t"
+	"movl %0,(%1)\n\t"
+	"addl $4,%1\n\t"
+	"decl %3\n\t"
+	"jnz 1b"
+	:"=r" (dummy1), "=r" (tmp), "=r" (from), "=r" (dummy2) 
+	:"1" (tmp), "2" (from), "3" (n/4)
+	:"memory");
+return (to);
+}
+
+extern inline void * __memcpy_by2(void * to, const void * from, size_t n)
+{
+register void *tmp = (void *)to;
+register int dummy1,dummy2;
+__asm__ __volatile__ (
+	"shrl $1,%3\n\t"
+	"jz 2f\n"                 /* only a word */
+	"1:\tmovl (%2),%0\n\t"
+	"addl $4,%2\n\t"
+	"movl %0,(%1)\n\t"
+	"addl $4,%1\n\t"
+	"decl %3\n\t"
+	"jnz 1b\n"
+	"2:\tmovw (%2),%w0\n\t"
+	"movw %w0,(%1)"
+	:"=r" (dummy1), "=r" (tmp), "=r" (from), "=r" (dummy2) 
+	:"1" (tmp), "2" (from), "3" (n/2)
+	:"memory");
+return (to);
+}
+
+extern inline void * __memcpy_g(void * to, const void * from, size_t n)
+{
+register void *tmp = (void *)to;
+__asm__ __volatile__ (
+	"cld\n\t"
+	"shrl $1,%%ecx\n\t"
+	"jnc 1f\n\t"
+	"movsb\n"
+	"1:\tshrl $1,%%ecx\n\t"
+	"jnc 2f\n\t"
+	"movsw\n"
+	"2:\trep\n\t"
+	"movsl"
+	: /* no output */
+	:"c" (n),"D" ((long) tmp),"S" ((long) from)
+	:"cx","di","si","memory");
+return (to);
+}
+
+
+#define __HAVE_ARCH_MEMMOVE
+extern inline void * memmove(void * dest,const void * src, size_t n)
+{
+register void *tmp = (void *)dest;
+if (dest<src)
+__asm__ __volatile__ (
+	"cld\n\t"
+	"rep\n\t"
+	"movsb"
+	: /* no output */
+	:"c" (n),"S" (src),"D" (tmp)
+	:"cx","si","di");
+else
+__asm__ __volatile__ (
+	"std\n\t"
+	"rep\n\t"
+	"movsb\n\t"
+	: /* no output */
+	:"c" (n), "S" (n-1+(const char *)src), "D" (n-1+(char *)tmp)
+	:"cx","si","di","memory");
+return dest;
+}
+
+extern inline int memcmp(const void * cs,const void * ct,size_t count)
+{
+register int __res;
+__asm__ __volatile__(
+	"cld\n\t"
+	"repe\n\t"
+	"cmpsb\n\t"
+	"je 1f\n\t"
+	"sbbl %0,%0\n\t"
+	"orb $1,%b0\n"
+	"1:"
+	:"=abd" (__res):"0" (0),"S" (cs),"D" (ct),"c" (count)
+	:"si","di","cx");
+return __res;
+}
+
+#define __HAVE_ARCH_MEMCHR
+extern inline void * memchr(const void * cs,int c,size_t count)
+{
+register void * __res;
+if (!count)
+	return NULL;
+__asm__ __volatile__(
+	"cld\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"je 1f\n\t"
+	"movl $1,%0\n"
+	"1:\tdecl %0"
+	:"=D" (__res):"a" (c),"D" (cs),"c" (count)
+	:"cx");
+return __res;
+}
+
+#define __memset_cc(s,c,count) \
+((count%4==0) ? \
+ __memset_cc_by4((s),(c),(count)) : \
+ ((count%2==0) ? \
+  __memset_cc_by2((s),(c),(count)) : \
+  __memset_cg((s),(c),(count))))
+
+#define __memset_gc(s,c,count) \
+((count%4==0) ? \
+ __memset_gc_by4((s),(c),(count)) : \
+ ((count%2==0) ? \
+  __memset_gc_by2((s),(c),(count)) : \
+  __memset_gg((s),(c),(count))))
+
+#define __HAVE_ARCH_MEMSET
+#define memset(s,c,count) \
+(__builtin_constant_p(c) ? \
+ (__builtin_constant_p(count) ? \
+  __memset_cc((s),(c),(count)) : \
+  __memset_cg((s),(c),(count))) : \
+ (__builtin_constant_p(count) ? \
+  __memset_gc((s),(c),(count)) : \
+  __memset_gg((s),(c),(count))))
+
+extern inline void * __memset_cc_by4(void * s, char c, size_t count)
+{
+/*
+ * register char *tmp = s;
+ */
+register char *tmp = (char *)s;
+register int  dummy;
+__asm__ __volatile__ (
+	"\n1:\tmovl %2,(%0)\n\t"
+	"addl $4,%0\n\t"
+	"decl %1\n\t"
+	"jnz 1b"
+	:"=r" (tmp), "=r" (dummy)
+	:"q" (0x01010101UL * (unsigned char) c), "0" (tmp), "1" (count/4)
+	:"memory");
+return s;
+}
+
+extern inline void * __memset_cc_by2(void * s, char c, size_t count)
+{
+register void *tmp = (void *)s;
+register int  dummy;
+__asm__ __volatile__ (
+	"shrl $1,%1\n\t"          /* may be divisible also by 4 */
+	"jz 2f\n"
+	"\n1:\tmovl %2,(%0)\n\t"
+	"addl $4,%0\n\t"
+	"decl %1\n\t"
+	"jnz 1b\n"
+	"2:\tmovw %w2,(%0)"
+	:"=r" (tmp), "=r" (dummy)
+	:"q" (0x01010101UL * (unsigned char) c), "0" (tmp), "1" (count/2)
+	:"memory");
+return s;
+}
+
+extern inline void * __memset_gc_by4(void * s, char c, size_t count)
+{
+register void *tmp = (void *)s;
+register int dummy;
+__asm__ __volatile__ (
+	"movb %b0,%h0\n"
+	"pushw %w0\n\t"
+	"shll $16,%0\n\t"
+	"popw %w0\n"
+	"1:\tmovl %0,(%1)\n\t"
+	"addl $4,%1\n\t"
+	"decl %2\n\t"
+	"jnz 1b\n"
+	:"=q" (c), "=r" (tmp), "=r" (dummy)
+	:"0" ((unsigned) c),  "1"  (tmp), "2" (count/4)
+	:"memory");
+return s;
+}
+
+extern inline void * __memset_gc_by2(void * s, char c, size_t count)
+{
+register void *tmp = (void *)s;
+register int dummy1,dummy2;
+__asm__ __volatile__ (
+	"movb %b0,%h0\n\t"
+	"shrl $1,%2\n\t"          /* may be divisible also by 4 */
+	"jz 2f\n\t"
+	"pushw %w0\n\t"
+	"shll $16,%0\n\t"
+	"popw %w0\n"
+	"1:\tmovl %0,(%1)\n\t"
+	"addl $4,%1\n\t"
+	"decl %2\n\t"
+	"jnz 1b\n"
+	"2:\tmovw %w0,(%1)"
+	:"=q" (dummy1), "=r" (tmp), "=r" (dummy2)
+	:"0" ((unsigned) c),  "1"  (tmp), "2" (count/2)
+	:"memory");
+return s;
+}
+
+extern inline void * __memset_cg(void * s, char c, size_t count)
+{
+register void *tmp = (void *)s;
+__asm__ __volatile__ (
+	"shrl $1,%%ecx\n\t"
+	"rep\n\t"
+	"stosw\n\t"
+	"jnc 1f\n\t"
+	"movb %%al,(%%edi)\n"
+	"1:"
+	: /* no output */
+	:"c" (count),"D" (tmp), "a" (0x0101U * (unsigned char) c)
+	:"cx","di","memory");
+return s;
+}
+
+extern inline void * __memset_gg(void * s,char c,size_t count)
+{
+register void *tmp = (void *)s;
+__asm__ __volatile__ (
+	"movb %%al,%%ah\n\t"
+	"shrl $1,%%ecx\n\t"
+	"rep\n\t"
+	"stosw\n\t"
+	"jnc 1f\n\t"
+	"movb %%al,(%%edi)\n"
+	"1:"
+	: /* no output */
+	:"c" (count),"D" (tmp), "a" (c)
+	:"cx","di","memory");
+return s;
+}
+
+
+/*
+ * find the first occurrence of byte 'c', or 1 past the area if none
+ */
+#define __HAVE_ARCH_MEMSCAN
+extern inline void * memscan(void * addr, int c, size_t size)
+{
+	if (!size)
+		return addr;
+	__asm__("cld
+		repnz; scasb
+		jnz 1f
+		dec %%edi
+1:		"
+		: "=D" (addr), "=c" (size)
+		: "0" (addr), "1" (size), "a" (c));
+	return addr;
+}
+
+#endif