1 files changed, 37 insertions, 0 deletions
diff --git a/newlib/libm/mathfp/s_isinf.c b/newlib/libm/mathfp/s_isinf.c
new file mode 100644
index 00000000000..fe9f547990c
--- /dev/null
+++ b/newlib/libm/mathfp/s_isinf.c
@@ -0,0 +1,37 @@
+
+/* @(#)z_isinf.c 1.0 98/08/13 */
+/******************************************************************
+ * isinf
+ *
+ * Input:
+ *   x - pointer to a floating point value
+ *
+ * Output:
+ *   An integer that indicates if the number is infinite.
+ *
+ * Description:
+ *   This routine returns an integer that indicates if the number
+ *   passed in is infinite (1) or is finite (0).
+ *
+ *****************************************************************/
+
+#include "fdlibm.h"
+#include "zmath.h"
+
+#ifndef _DOUBLE_IS_32BITS
+
+int isinf (double x)
+{
+  __uint32_t lx, hx;
+  int exp;
+
+  EXTRACT_WORDS (hx, lx, x);
+  exp = (hx & 0x7ff00000) >> 20;
+
+  if ((exp == 0x7ff) && ((hx & 0xf0000 || lx) == 0))
+    return (1);
+  else
+    return (0);
+}
+
+#endif /* _DOUBLE_IS_32BITS */