1 files changed, 35 insertions, 0 deletions
diff --git a/libc/math/sf_isinf.c b/libc/math/sf_isinf.c
new file mode 100644
index 0000000..1af4aab
--- /dev/null
+++ b/libc/math/sf_isinf.c
@@ -0,0 +1,35 @@
+/*
+ * isinff(x) returns 1 if x is infinity, else 0;
+ * no branching!
+ * Added by Cygnus Support.
+ */
+
+#include "fdlibm.h"
+
+#ifdef __STDC__
+	int isinff(float x)
+#else
+	int isinff(x)
+	float x;
+#endif
+{
+	__int32_t ix;
+	GET_FLOAT_WORD(ix,x);
+	ix &= 0x7fffffff;
+	ix = 0x7f800000 - ix;
+	return 1 - (int)((__uint32_t)(ix|(-ix))>>31);
+}
+
+#ifdef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+	int isinf(double x)
+#else
+	int isinf(x)
+	double x;
+#endif
+{
+	return isinff((float) x);
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */