1 files changed, 66 insertions, 0 deletions
diff --git a/modules/fdlibm/src/e_asinf.cpp b/modules/fdlibm/src/e_asinf.cpp
new file mode 100644
index 0000000000..62727032c9
--- /dev/null
+++ b/modules/fdlibm/src/e_asinf.cpp
@@ -0,0 +1,66 @@
+/* e_asinf.c -- float version of e_asin.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 <sys/cdefs.h>
+//__FBSDID("$FreeBSD$");
+
+#include <cmath>
+
+#include "math_private.h"
+
+static const float
+one =  1.0000000000e+00, /* 0x3F800000 */
+huge =  1.000e+30,
+	/* coefficient for R(x^2) */
+pS0 =  1.6666586697e-01,
+pS1 = -4.2743422091e-02,
+pS2 = -8.6563630030e-03,
+qS1 = -7.0662963390e-01;
+
+static const double
+pio2 =  1.570796326794896558e+00;
+
+float
+__ieee754_asinf(float x)
+{
+	double s;
+	float t,w,p,q;
+	int32_t hx,ix;
+	GET_FLOAT_WORD(hx,x);
+	ix = hx&0x7fffffff;
+	if(ix>=0x3f800000) {		/* |x| >= 1 */
+	    if(ix==0x3f800000)		/* |x| == 1 */
+		return x*pio2;		/* asin(+-1) = +-pi/2 with inexact */
+	    return (x-x)/(x-x);		/* asin(|x|>1) is NaN */
+	} else if (ix<0x3f000000) {	/* |x|<0.5 */
+	    if(ix<0x39800000) {		/* |x| < 2**-12 */
+		if(huge+x>one) return x;/* return x with inexact if x!=0*/
+	    }
+	    t = x*x;
+	    p = t*(pS0+t*(pS1+t*pS2));
+	    q = one+t*qS1;
+	    w = p/q;
+	    return x+x*w;
+	}
+	/* 1> |x|>= 0.5 */
+	w = one-fabsf(x);
+	t = w*(float)0.5;
+	p = t*(pS0+t*(pS1+t*pS2));
+	q = one+t*qS1;
+	s = std::sqrt(t);
+	w = p/q;
+	t = pio2-2.0*(s+s*w);
+	if(hx>0) return t; else return -t;
+}