import newlib-2000-02-17 snapshot

1 files changed, 66 insertions, 0 deletions

diff --git a/newlib/libm/math/sf_asinh.c b/newlib/libm/math/sf_asinh.c
new file mode 100644
index 000000000..d5dfef811
--- /dev/null
+++ b/newlib/libm/math/sf_asinh.c
@@ -0,0 +1,66 @@
+/* sf_asinh.c -- float version of s_asinh.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 "fdlibm.h"
+
+#ifdef __STDC__
+static const float 
+#else
+static float 
+#endif
+one =  1.0000000000e+00, /* 0x3F800000 */
+ln2 =  6.9314718246e-01, /* 0x3f317218 */
+huge=  1.0000000000e+30; 
+
+#ifdef __STDC__
+	float asinhf(float x)
+#else
+	float asinhf(x)
+	float x;
+#endif
+{	
+	float t,w;
+	__int32_t hx,ix;
+	GET_FLOAT_WORD(hx,x);
+	ix = hx&0x7fffffff;
+	if(ix>=0x7f800000) return x+x;	/* x is inf or NaN */
+	if(ix< 0x31800000) {	/* |x|<2**-28 */
+	    if(huge+x>one) return x;	/* return x inexact except 0 */
+	} 
+	if(ix>0x4d800000) {	/* |x| > 2**28 */
+	    w = __ieee754_logf(fabsf(x))+ln2;
+	} else if (ix>0x40000000) {	/* 2**28 > |x| > 2.0 */
+	    t = fabsf(x);
+	    w = __ieee754_logf((float)2.0*t+one/(__ieee754_sqrtf(x*x+one)+t));
+	} else {		/* 2.0 > |x| > 2**-28 */
+	    t = x*x;
+	    w =log1pf(fabsf(x)+t/(one+__ieee754_sqrtf(one+t)));
+	}
+	if(hx>0) return w; else return -w;
+}
+
+#ifdef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+	double asinh(double x)
+#else
+	double asinh(x)
+	double x;
+#endif
+{
+	return (double) asinhf((float) x);
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */