plan9port

commit ada7ea055b221d489ebfbf2b2900b4e39f3fd043
parent fdfecd686054be1aac715fb3b99669873df002bb
Author: rsc <devnull@localhost>
Date:   Fri,  6 Apr 2007 13:27:55 +0000

another day, another __isNaN

Diffstat:
M
src/lib9/fmt/nan64.c
 | 
3
++-

1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/lib9/fmt/nan64.c b/src/lib9/fmt/nan64.c
@@ -31,7 +31,8 @@ __isNaN(double d)
 
 	p = &d;
 	x = *(uvlong*)p;
-	return (ulong)((x>>52)&0x7FF)==0x7FF && !__isInf(d, 0);
+	/* IEEE 754: exponent bits 0x7FF and non-zero mantissa */
+	return (x&uvinf) == uvinf && (x&~uvneginf) != 0;
 }
 
 double