1 files changed, 73 insertions, 0 deletions
diff --git a/circuitpython/lib/libm/wf_tgamma.c b/circuitpython/lib/libm/wf_tgamma.c
new file mode 100644
index 0000000..3ff05f3
--- /dev/null
+++ b/circuitpython/lib/libm/wf_tgamma.c
@@ -0,0 +1,73 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * These math functions are taken from newlib-nano-2, the newlib/libm/math
+ * directory, available from https://github.com/32bitmicro/newlib-nano-2.
+ *
+ * Appropriate copyright headers are reproduced below.
+ */
+
+/* w_gammaf.c -- float version of w_gamma.c.
+ * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
+ */
+
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+#include "math.h"
+#include "fdlibm.h"
+#define _IEEE_LIBM 1
+
+#ifdef __STDC__
+	float tgammaf(float x)
+#else
+	float tgammaf(x)
+	float x;
+#endif
+{
+        float y;
+	int local_signgam;
+	if (!isfinite(x)) {
+	  /* special cases: tgammaf(nan)=nan, tgammaf(inf)=inf, tgammaf(-inf)=nan */
+	  return x + INFINITY;
+	}
+	y = expf(__ieee754_lgammaf_r(x,&local_signgam));
+	if (local_signgam < 0) y = -y;
+#ifdef _IEEE_LIBM
+	return y;
+#else
+	if(_LIB_VERSION == _IEEE_) return y;
+
+	if(!finitef(y)&&finitef(x)) {
+	  if(floorf(x)==x&&x<=(float)0.0)
+	    /* tgammaf pole */
+	    return (float)__kernel_standard((double)x,(double)x,141);
+	  else
+	    /* tgammaf overflow */
+	    return (float)__kernel_standard((double)x,(double)x,140);
+	}
+	return y;
+#endif
+}
+
+#ifdef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+	double tgamma(double x)
+#else
+	double tgamma(x)
+	double x;
+#endif
+{
+	return (double) tgammaf((float) x);
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */