1 files changed, 29 insertions, 0 deletions
diff --git a/newlib/libm/common/sf_isinf.c b/newlib/libm/common/sf_isinf.c
new file mode 100644
index 000000000..9ee60c062
--- /dev/null
+++ b/newlib/libm/common/sf_isinf.c
@@ -0,0 +1,29 @@
+/*
+ * isinff(x) returns 1 if x is +-infinity, else 0;
+ *
+ * isinff is an extension declared in <ieeefp.h> and
+ * <math.h>.
+ */
+
+#include "fdlibm.h"
+
+int
+_DEFUN (isinff, (x),
+	float x)
+{
+	__int32_t ix;
+	GET_FLOAT_WORD(ix,x);
+	ix &= 0x7fffffff;
+	return FLT_UWORD_IS_INFINITE(ix);
+}
+
+#ifdef _DOUBLE_IS_32BITS
+
+int
+_DEFUN (isinf, (x),
+	double x)
+{
+	return isinff((float) x);
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */