optimize nop case of wmemmove

diff --git a/src/string/wmemmove.c b/src/string/wmemmove.c
index d58cebac989185687d9b0f6c2062279a162f425f..964c9032991ed4620b381cb9dcb31eb789ac19a5 100644 (file)
--- a/src/string/wmemmove.c
+++ b/src/string/wmemmove.c
@@ -4,6 +4,7 @@
 wchar_t *wmemmove(wchar_t *d, const wchar_t *s, size_t n)
 {
        wchar_t *d0 = d;
+       if (d == s) return d;
        if ((uintptr_t)d-(uintptr_t)s < n * sizeof *d)
                while (n--) d[n] = s[n];
        else