From ef219fd6487ba2f93d1f4d02761f27e041af1ac9 Mon Sep 17 00:00:00 2001
From: Robert Bradshaw <robertwb@gmail.com>
Date: Tue, 9 Apr 2013 14:34:23 -0700
Subject: Ensure NAN is always initialized.

---
 Cython/Utility/ModuleSetupCode.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'Cython/Utility/ModuleSetupCode.c')

diff --git a/Cython/Utility/ModuleSetupCode.c b/Cython/Utility/ModuleSetupCode.c
index e28844ccd..295307237 100644
--- a/Cython/Utility/ModuleSetupCode.c
+++ b/Cython/Utility/ModuleSetupCode.c
@@ -262,6 +262,19 @@
   #define __Pyx_DOCSTR(n)  (n)
 #endif
 
+#ifdef NAN
+#define __PYX_NAN() ((float) NAN)
+#else
+static inline float __PYX_NAN() {
+  /* Initialize NaN. The sign is irrelevant, an exponent with all bits 1 and
+   a nonzero mantissa means NaN. If the first bit in the mantissa is 1, it is
+   a quiet NaN. */
+  float value;
+  memset(&value, 0xFF, sizeof(value));
+  return value;
+}
+#endif
+
 /////////////// UtilityFunctionPredeclarations.proto ///////////////
 
 /* inline attribute */
-- 
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