From 3705d03b0fbe349dee0221d982965a0590bc7cb0 Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Tue, 31 Mar 2009 16:06:19 -0600
Subject: gallium: added util_is_inf_or_nan() function to u_math.h

---
 src/gallium/auxiliary/util/u_math.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'src/gallium/auxiliary/util/u_math.h')

diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h
index 9268a9bb7e..e5003af01d 100644
--- a/src/gallium/auxiliary/util/u_math.h
+++ b/src/gallium/auxiliary/util/u_math.h
@@ -319,6 +319,18 @@ util_iround(float f)
 
 
 
+/**
+ * Test if x is NaN or +/- infinity.
+ */
+static INLINE boolean
+util_is_inf_or_nan(float x)
+{
+   union fi tmp;
+   tmp.f = x;
+   return !(int)((unsigned int)((tmp.i & 0x7fffffff)-0x7f800000) >> 31);
+}
+
+
 /**
  * Find first bit set in word.  Least significant bit is 1.
  * Return 0 if no bits set.
-- 
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