From: Paul Eggert <eggert@cs.ucla.edu>
Date: Thu, 29 Jul 2004 17:33:38 +0000 (+0000)
Subject: (UNALIGNED_P): Use sizeof, not alignof.
X-Git-Tag: v5.3.0~1025
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3a7060d519a3c7600f81cd5b874a2a7486e30caf;p=thirdparty%2Fcoreutils.git

(UNALIGNED_P): Use sizeof, not alignof.
---

diff --git a/lib/memchr.c b/lib/memchr.c
index 4cb1a8b510..2b2932fb18 100644
--- a/lib/memchr.c
+++ b/lib/memchr.c
@@ -48,9 +48,11 @@ USA.  */
 # include <stdint.h>
 #endif
 
-#define alignof(type) offsetof (struct { char c; type x; }, x)
+/* Use sizeof, not alignof, for better performance on some hosts.  For
+   example, on m68k-linux alignof (type) will always be at most 2, but
+   you get better performance with a 4-byte aligned pointer.  */
 #ifdef UINTPTR_MAX
-# define UNALIGNED_P(p) (((uintptr_t) p) % alignof (unsigned long int) != 0)
+# define UNALIGNED_P(p) (((uintptr_t) p) % sizeof (unsigned long int) != 0)
 #else
 # define UNALIGNED_P(p) 1
 #endif