Kernel/x86_64 - Fix broken memset

diff --git a/KernelLand/Kernel/arch/x86_64/lib.c b/KernelLand/Kernel/arch/x86_64/lib.c
index 977cffd..85dda82 100644 (file)
--- a/KernelLand/Kernel/arch/x86_64/lib.c
+++ b/KernelLand/Kernel/arch/x86_64/lib.c
@@ -370,11 +370,11 @@ void *memset(void *__dest, int __val, size_t __count)
                __asm__ __volatile__ ("rep stosb" : : "D"(__dest),"a"(__val),"c"(__count));
        else {
                Uint8   *dst = __dest;
+               size_t  qwords = __count / 8;
+               size_t  trail_bytes = __count % 8;
 
-               __asm__ __volatile__ ("rep stosq" : : "D"(dst),"a"(0),"c"(__count/8));
-               dst += __count & ~7;
-               __count = __count & 7;
-               while( __count-- )
+               __asm__ __volatile__ ("rep stosq" : "=D"(dst) : "D"(dst),"a"(0),"c"(qwords));
+               while( trail_bytes-- )
                        *dst++ = 0;
        }
        return __dest;