1 files changed, 55 insertions, 0 deletions
diff --git a/lib/msun/src/k_logf.h b/lib/msun/src/k_logf.h
new file mode 100644
index 0000000..d9f0f3d
--- /dev/null
+++ b/lib/msun/src/k_logf.h
@@ -0,0 +1,55 @@
+/*
+ * ====================================================
+ * 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("$FreeBSD$");
+
+/*
+ * float version of __kernel_log(x). See k_log.c for details.
+ */
+
+static const float
+/* |(log(1+s)-log(1-s))/s - Lg(s)| < 2**-34.24 (~[-4.95e-11, 4.97e-11]). */
+Lg1 =      0xaaaaaa.0p-24,	/* 0.66666662693 */
+Lg2 =      0xccce13.0p-25,	/* 0.40000972152 */
+Lg3 =      0x91e9ee.0p-25,	/* 0.28498786688 */
+Lg4 =      0xf89e26.0p-26;	/* 0.24279078841 */
+
+static inline float
+__kernel_logf(float x)
+{
+	float hfsq,f,s,z,R,w,t1,t2;
+	int32_t ix,i,j;
+
+	GET_FLOAT_WORD(ix,x);
+
+	f = x-(float)1.0;
+	if((0x007fffff&(0x8000+ix))<0xc000) {	/* -2**-9 <= f < 2**-9 */
+	    if(f==0.0f) return 0.0f;
+	    return f*f*((float)0.33333333333333333*f-(float)0.5);
+	}
+ 	s = f/((float)2.0+f);
+	z = s*s;
+	ix &= 0x007fffff;
+	i = ix-(0x6147a<<3);
+	w = z*z;
+	j = (0x6b851<<3)-ix;
+	t1= w*(Lg2+w*Lg4);
+	t2= z*(Lg1+w*Lg3);
+	i |= j;
+	R = t2+t1;
+	if(i>0) {
+	    hfsq=(float)0.5*f*f;
+	    return s*(hfsq+R) - hfsq;
+	} else {
+	    return s*(R-f);
+	}
+}