[PATCH] Delete x86 string functions

[Flavio Cruz]

The i386 functions are not used and the more portable versions in kern/strings.c
are faster (1-4x faster in synthetic benchmarks compiled with -O2 on my x86_64 
box).
---
 i386/i386/strings.c | 54 ---------------------------------------------
 1 file changed, 54 deletions(-)

diff --git a/i386/i386/strings.c b/i386/i386/strings.c
index 84a3bc16..f1752de2 100644
--- a/i386/i386/strings.c
+++ b/i386/i386/strings.c
@@ -94,57 +94,3 @@ memcmp(const void *s1, const void *s2, size_t n)
     return (int)c1 - (int)c2;
 }
 #endif /* ARCH_STRING_MEMCMP */
-
-#ifdef ARCH_STRING_STRLEN
-size_t
-strlen(const char *s)
-{
-    size_t n;
-
-    n = (size_t)-1;
-    asm volatile("repne scasb"
-                 : "+D" (s), "+c" (n)
-                 : "a" (0)
-                 : "memory");
-    return ~n - 1;
-}
-#endif /* ARCH_STRING_STRLEN */
-
-#ifdef ARCH_STRING_STRCPY
-char *
-strcpy(char *dest, const char *src)
-{
-    char *orig_dest;
-
-    orig_dest = dest;
-    asm volatile("1:\n"
-                 "lodsb\n"
-                 "stosb\n"
-                 "testb %%al, %%al\n"
-                 "jnz 1b\n"
-                 : "+D" (dest), "+S" (src)
-                 : : "al", "memory");
-    return orig_dest;
-}
-#endif /* ARCH_STRING_STRCPY */
-
-#ifdef ARCH_STRING_STRCMP
-int
-strcmp(const char *s1, const char *s2)
-{
-    unsigned char c1, c2;
-
-    asm volatile("1:\n"
-                 "lodsb\n"
-                 "scasb\n"
-                 "jne 1f\n"
-                 "testb %%al, %%al\n"
-                 "jnz 1b\n"
-                 "1:\n"
-                 : "+D" (s1), "+S" (s2)
-                 : : "al", "memory");
-    c1 = *(((const unsigned char *)s1) - 1);
-    c2 = *(((const unsigned char *)s2) - 1);
-    return (int)c1 - (int)c2;
-}
-#endif /* ARCH_STRING_STRCMP */
-- 
2.39.0