From 708c687a6f64bf7ea5dec46b28073fc8eacec1ca Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Tue, 19 Oct 2004 21:21:42 +0000 Subject: Update. 2004-10-18 Jakub Jelinek * sysdeps/generic/strcpy_chk.c (__strcpy_chk): Speed up by checking destlen only every 4 bytes. --- sysdeps/generic/strcpy_chk.c | 30 ++++++++++++++++++++++++++---- 1 file changed, 26 insertions(+), 4 deletions(-) (limited to 'sysdeps') diff --git a/sysdeps/generic/strcpy_chk.c b/sysdeps/generic/strcpy_chk.c index 5c1ae44cd0..a4d909feda 100644 --- a/sysdeps/generic/strcpy_chk.c +++ b/sysdeps/generic/strcpy_chk.c @@ -31,14 +31,36 @@ __strcpy_chk (dest, src, destlen) { reg_char c; char *s = (char *) src; - const ptrdiff_t off = dest - s - 1; + const ptrdiff_t off = dest - s; + + while (__builtin_expect (destlen >= 4, 0)) + { + c = s[0]; + s[off] = c; + if (c == '\0') + return dest; + c = s[1]; + s[off + 1] = c; + if (c == '\0') + return dest; + c = s[2]; + s[off + 2] = c; + if (c == '\0') + return dest; + c = s[3]; + s[off + 3] = c; + if (c == '\0') + return dest; + destlen -= 4; + s += 4; + } do { if (__builtin_expect (destlen-- == 0, 0)) - __chk_fail (); - c = *s++; - s[off] = c; + __chk_fail (); + c = *s; + *(s++ + off) = c; } while (c != '\0'); -- cgit 1.4.1