[libav-devel] [PATCH] libm: Provide fallback definitions for isnan() and isinf()

[Martin Storsjö]

---
 configure        |    4 ++++
 libavutil/libm.h |   21 +++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/configure b/configure
index d3795e4..0f85f9a 100755
--- a/configure
+++ b/configure
@@ -1095,6 +1095,8 @@ HAVE_LIST="
     inline_asm
     io_h
     isatty
+    isinf
+    isnan
     jack_port_get_latency_range
     ldbrx
     libdc1394_1
@@ -2926,6 +2928,8 @@ enabled vaapi && require vaapi va/va.h vaInitialize -lva
 check_mathfunc cbrtf
 check_mathfunc exp2
 check_mathfunc exp2f
+check_mathfunc isnan
+check_mathfunc isinf
 check_mathfunc llrint
 check_mathfunc llrintf
 check_mathfunc log2
diff --git a/libavutil/libm.h b/libavutil/libm.h
index b6d8a94..8748403 100644
--- a/libavutil/libm.h
+++ b/libavutil/libm.h
@@ -27,6 +27,7 @@
 #include <math.h>
 #include "config.h"
 #include "attributes.h"
+#include "intfloat.h"
 
 #if !HAVE_CBRTF
 static av_always_inline float cbrtf(float x)
@@ -45,6 +46,26 @@ static av_always_inline float cbrtf(float x)
 #define exp2f(x) ((float)exp2(x))
 #endif /* HAVE_EXP2F */
 
+#if !HAVE_ISNAN
+static av_always_inline av_const int isnan(float x)
+{
+    uint32_t v = av_float2int(x);
+    if ((v & 0x7f800000) != 0x7f800000)
+        return 0;
+    return v & 0x007fffff;
+}
+#endif /* HAVE_ISNAN */
+
+#if !HAVE_ISINF
+static av_always_inline av_const int isinf(double x)
+{
+    uint32_t v = av_float2int(x);
+    if ((v & 0x7f800000) != 0x7f800000)
+        return 0;
+    return !(v & 0x007fffff);
+}
+#endif /* HAVE_ISINF */
+
 #if !HAVE_LLRINT
 #undef llrint
 #define llrint(x) ((long long)rint(x))
-- 
1.7.9.4

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