Module: Mesa
Branch: master
Commit: 3705d03b0fbe349dee0221d982965a0590bc7cb0
URL:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=3705d03b0fbe349dee0221d982965a0590bc7cb0
Author: Brian Paul <bri...@vmware.com>
Date: Tue Mar 31 16:06:19 2009 -0600
gallium: added util_is_inf_or_nan() function to u_math.h
---
src/gallium/auxiliary/util/u_math.h | 12 ++++++++++++
1 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/src/gallium/auxiliary/util/u_math.h
b/src/gallium/auxiliary/util/u_math.h
index 9268a9b..e5003af 100644
--- a/src/gallium/auxiliary/util/u_math.h
+++ b/src/gallium/auxiliary/util/u_math.h
@@ -320,6 +320,18 @@ 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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