tfix nan64 - plan9port - [fork] Plan 9 from user space
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       ---
   DIR commit 35920e96a1bd6dcc5c803582ce9568c2f0a4fdc1
   DIR parent e54f9a4ad2f163f9455f3de4b3e5574884391790
  HTML Author: rsc <devnull@localhost>
       Date:   Thu, 10 May 2007 04:18:22 +0000
       
       fix nan64
       
       Diffstat:
         M src/lib9/fmt/nan64.c                |      15 +++++++++++----
       
       1 file changed, 11 insertions(+), 4 deletions(-)
       ---
   DIR diff --git a/src/lib9/fmt/nan64.c b/src/lib9/fmt/nan64.c
       t@@ -26,11 +26,18 @@ __NaN(void)
        int
        __isNaN(double d)
        {
       +        /*
       +         * Used to just say x = *(uvlong*)&d,
       +         * but gcc miscompiles that!
       +         */
       +        union {
       +                uvlong i;
       +                double f;
       +        } u;
                uvlong x;
       -        double *p;
       -
       -        p = &d;
       -        x = *(uvlong*)p;
       +        
       +        u.f = d;
       +        x = u.i;
                /* IEEE 754: exponent bits 0x7FF and non-zero mantissa */
                return (x&uvinf) == uvinf && (x&~uvneginf) != 0;
        }