Usermode/libc - Fixing little bugs/speed issues

[tpg/acess2.git] / Usermode / Libraries / libc.so_src / string.c

diff --git a/Usermode/Libraries/libc.so_src/string.c b/Usermode/Libraries/libc.so_src/string.c
index a5becf8..e9e1574 100644 (file)
--- a/Usermode/Libraries/libc.so_src/string.c
+++ b/Usermode/Libraries/libc.so_src/string.c
@@ -14,7 +14,7 @@
  */
 EXPORT int strcmp(const char *s1, const char *s2)
 {
-       while(*s1 == *s2 && *s1 != '\0' && *s2 != '\0') {
+       while(*s1 && *s1 == *s2) {
                s1++; s2++;
        }
        return (int)*s1 - (int)*s2;
@@ -26,7 +26,7 @@ EXPORT int strcmp(const char *s1, const char *s2)
  */
 EXPORT int strncmp(const char *s1, const char *s2, size_t n)
 {
-       while(n && *s1 == *s2 && *s1 != '\0' && *s2 != '\0')
+       while(n && *s1 && *s1 == *s2)
        {
                s1++; s2++;
                n --;
@@ -229,6 +229,21 @@ EXPORT void *memcpy(void *__dest, const void *__src, size_t count)
                const char      *sp = __src;
                while(count--) *dp++ = *sp ++;
        }
+       // TODO: Bulk aligned copies
+       #if 0
+       else if(count > 128 && (dst & 15) == (src & 15) )
+       {
+               // SSE/bulk copy
+               for( ; dst & 15; count -- )
+                       *(char*)dst++ = *(char*)src++;
+               memcpy_16byte(dst, src, count / 16);
+               dst += count & ~15;
+               src += count & ~15;
+               count &= 15;
+               while(count --)
+                       *(char*)dst++ = *(char*)src++;
+       }
+       #endif
        else
        {
                void    **dp, **sp;
@@ -255,14 +270,14 @@ EXPORT void *memcpy(void *__dest, const void *__src, size_t count)
  */
 EXPORT void *memmove(void *dest, const void *src, size_t count)
 {
-    char *sp = (char *)src;
-    char *dp = (char *)dest;
-       // Check if corruption will happen
+       char *sp = (char *)src;
+       char *dp = (char *)dest;
+       // Check if the areas overlap
        if( (intptr_t)dest > (intptr_t)src && (intptr_t)dest < (intptr_t)src+count )
                for(;count--;) dp[count] = sp[count];
        else
-       for(;count--;) *dp++ = *sp++;
-    return dest;
+               for(;count--;) *dp++ = *sp++;
+       return dest;
 }
 
 /**
@@ -274,12 +289,13 @@ EXPORT void *memmove(void *dest, const void *src, size_t count)
  */
 EXPORT int memcmp(const void *mem1, const void *mem2, size_t count)
 {
+       const unsigned char     *p1 = mem1, *p2 = mem2;
        while(count--)
        {
-               if( *(unsigned char*)mem1 != *(unsigned char*)mem2 )
-                       return *(unsigned char*)mem1 - *(unsigned char*)mem2;
-               mem1 ++;
-               mem2 ++;
+               if( *p1 != *p2 )
+                       return *p1 - *p2;
+               p1 ++;
+               p2 ++;
        }
        return 0;
 }