From f95a4a932476be2ba99e2fd081e8d2bc6ea12813 Mon Sep 17 00:00:00 2001
From: PikalaxALT <pikalaxalt@gmail.com>
Date: Fri, 15 Dec 2017 09:38:53 -0500
Subject: Import newlib and create makefile

---
 newlib/libm/mathfp/sf_atan.c | 45 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 newlib/libm/mathfp/sf_atan.c

(limited to 'newlib/libm/mathfp/sf_atan.c')

diff --git a/newlib/libm/mathfp/sf_atan.c b/newlib/libm/mathfp/sf_atan.c
new file mode 100644
index 0000000..26be2fa
--- /dev/null
+++ b/newlib/libm/mathfp/sf_atan.c
@@ -0,0 +1,45 @@
+
+/* @(#)z_atanf.c 1.0 98/08/13 */
+/******************************************************************
+ * Arctangent
+ *
+ * Input:
+ *   x - floating point value
+ *
+ * Output:
+ *   arctan of x
+ *
+ * Description:
+ *   This routine returns the arctan of x.
+ *
+ *****************************************************************/
+
+#include "fdlibm.h"
+#include "zmath.h"
+
+float
+_DEFUN (atanf, (float),
+        float x)
+{
+  switch (numtestf (x))
+    {
+      case NAN:
+        errno = EDOM;
+        return (x);
+      case INF:
+        /* this should check to see if neg NaN or pos NaN... */
+        return (__PI_OVER_TWO);
+      case 0:
+        return (0.0);
+      default:
+        return (atangentf (x, 0, 0, 0));
+    }
+}
+
+#ifdef _DOUBLE_IS_32BITS
+double atan (double x)
+{
+  return (double) atangentf ((float) x, 0);
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */
-- 
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