lavu/libm: add isfinite fallback
authorGanesh Ajjanagadde <gajjanagadde@gmail.com>
Thu, 14 Jan 2016 00:09:25 +0000 (19:09 -0500)
committerGanesh Ajjanagadde <gajjanagadde@gmail.com>
Thu, 14 Jan 2016 01:00:19 +0000 (20:00 -0500)
Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
configure
libavutil/libm.h

index 6d14d37..28ec5bf 100755 (executable)
--- a/configure
+++ b/configure
@@ -1820,6 +1820,7 @@ MATH_FUNCS="
     exp2f
     expf
     hypot
+    isfinite
     isinf
     isnan
     ldexpf
index bc44dca..a819962 100644 (file)
@@ -343,6 +343,25 @@ static av_always_inline av_const int avpriv_isnan(double x)
         : avpriv_isnan(x))
 #endif /* HAVE_ISNAN */
 
+#if !HAVE_ISFINITE
+static av_always_inline av_const int avpriv_isfinitef(float x)
+{
+    uint32_t v = av_float2int(x);
+    return (v & 0x7f800000) != 0x7f800000;
+}
+
+static av_always_inline av_const int avpriv_isfinite(double x)
+{
+    uint64_t v = av_double2int(x);
+    return (v & 0x7ff0000000000000) != 0x7ff0000000000000;
+}
+
+#define isfinite(x)                  \
+    (sizeof(x) == sizeof(float)      \
+        ? avpriv_isfinitef(x)        \
+        : avpriv_isfinite(x))
+#endif /* HAVE_ISFINITE */
+
 #if !HAVE_HYPOT
 static inline av_const double hypot(double x, double y)
 {