From 35920e96a1bd6dcc5c803582ce9568c2f0a4fdc1 Mon Sep 17 00:00:00 2001
From: rsc <devnull@localhost>
Date: Thu, 10 May 2007 04:18:22 +0000
Subject: fix nan64

---
 src/lib9/fmt/nan64.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/lib9/fmt/nan64.c b/src/lib9/fmt/nan64.c
index 3a1f2111..7d719157 100644
--- a/src/lib9/fmt/nan64.c
+++ b/src/lib9/fmt/nan64.c
@@ -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;
 }
-- 
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