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authorBrian Paul <brianp@vmware.com>2009-03-31 16:06:19 -0600
committerBrian Paul <brianp@vmware.com>2009-03-31 16:21:51 -0600
commit3705d03b0fbe349dee0221d982965a0590bc7cb0 (patch)
treefd88d1be92fa895e246c7124fd319977004a246d /src/gallium/auxiliary
parent53d507562b252718d95fd99812f5d21c9ae79713 (diff)
gallium: added util_is_inf_or_nan() function to u_math.h
Diffstat (limited to 'src/gallium/auxiliary')
-rw-r--r--src/gallium/auxiliary/util/u_math.h12
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 9268a9bb7e..e5003af01d 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.
*/