xdiff: avoid compiler warnings with XDL_FAST_HASH on 32-bit machines

René Scharfe · gitster · commit 9322ce21eeb4 · 2012-05-22T14:39:49.000-07:00
Import macro REPEAT_BYTE from Linux (arch/x86/include/asm/word-at-a-time.h)
to avoid 64-bit integer literals, which cause some 32-bit compilers to
print warnings.

Reported-by: Øyvind A. Holm &lt;sunny@sunbase.org&gt;
Signed-off-by: Rene Scharfe &lt;rene.scharfe@lsrfire.ath.cx&gt;
Signed-off-by: Junio C Hamano &lt;gitster@pobox.com&gt;
diff --git a/xdiff/xutils.c b/xdiff/xutils.c
@@ -280,9 +280,11 @@ static unsigned long xdl_hash_record_with_whitespace(char const **data,
 
 #ifdef XDL_FAST_HASH
 
-#define ONEBYTES	0x0101010101010101ul
-#define NEWLINEBYTES	0x0a0a0a0a0a0a0a0aul
-#define HIGHBITS	0x8080808080808080ul
+#define REPEAT_BYTE(x)  ((~0ul / 0xff) * (x))
+
+#define ONEBYTES	REPEAT_BYTE(0x01)
+#define NEWLINEBYTES	REPEAT_BYTE(0x0a)
+#define HIGHBITS	REPEAT_BYTE(0x80)
 
 /* Return the high bit set in the first byte that is a zero */
 static inline unsigned long has_zero(unsigned long a)
