Add implementations of acosl(), asinl(), atanl(), atan2l(),

and cargl().

Reviewed by:			bde
sparc64 testing resources from:	remko

1 files changed, 107 insertions, 0 deletions

diff --git a/lib/msun/src/e_atan2l.c b/lib/msun/src/e_atan2l.c
new file mode 100644
index 0000000..8368bbf
--- /dev/null
+++ b/lib/msun/src/e_atan2l.c
@@ -0,0 +1,107 @@
+
+/* @(#)e_atan2.c 1.3 95/01/18 */
+/* FreeBSD: head/lib/msun/src/e_atan2.c 176451 2008-02-22 02:30:36Z das */
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunSoft, 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("$FreeBSD$");
+
+/*
+ * See comments in e_atan2.c.
+ * Converted to long double by David Schultz <das@FreeBSD.ORG>.
+ */
+
+#include <float.h>
+
+#include "invtrig.h"
+#include "math.h"
+#include "math_private.h"
+
+static volatile long double
+tiny  = 1.0e-300;
+static const long double
+zero  = 0.0,
+pi = 3.14159265358979323846264338327950280e+00L;
+
+long double
+atan2l(long double y, long double x)
+{
+	union IEEEl2bits ux, uy;
+	long double z;
+	int32_t k,m;
+	int16_t exptx, expsignx, expty, expsigny;
+
+	uy.e = y;
+	expsigny = uy.xbits.expsign;
+	expty = expsigny & 0x7fff;
+	ux.e = x;
+	expsignx = ux.xbits.expsign;
+	exptx = expsignx & 0x7fff;
+
+	if ((exptx==BIAS+LDBL_MAX_EXP &&
+	     ((ux.bits.manh&~LDBL_NBIT)|ux.bits.manl)!=0) ||	/* x is NaN */
+	    (expty==BIAS+LDBL_MAX_EXP &&
+	     ((uy.bits.manh&~LDBL_NBIT)|uy.bits.manl)!=0))	/* y is NaN */
+	    return x+y;
+	if (expsignx==BIAS && ((ux.bits.manh&~LDBL_NBIT)|ux.bits.manl)==0)
+	    return atanl(y);					/* x=1.0 */
+	m = ((expsigny>>15)&1)|((expsignx>>14)&2);	/* 2*sign(x)+sign(y) */
+
+    /* when y = 0 */
+	if(expty==0 && ((uy.bits.manh&~LDBL_NBIT)|uy.bits.manl)==0) {
+	    switch(m) {
+		case 0: 
+		case 1: return y; 	/* atan(+-0,+anything)=+-0 */
+		case 2: return  pi+tiny;/* atan(+0,-anything) = pi */
+		case 3: return -pi-tiny;/* atan(-0,-anything) =-pi */
+	    }
+	}
+    /* when x = 0 */
+	if(exptx==0 && ((ux.bits.manh&~LDBL_NBIT)|ux.bits.manl)==0)
+	    return (expsigny<0)?  -pio2_hi-tiny: pio2_hi+tiny;
+
+    /* when x is INF */
+	if(exptx==BIAS+LDBL_MAX_EXP) {
+	    if(expty==BIAS+LDBL_MAX_EXP) {
+		switch(m) {
+		    case 0: return  pio2_hi*0.5+tiny;/* atan(+INF,+INF) */
+		    case 1: return -pio2_hi*0.5-tiny;/* atan(-INF,+INF) */
+		    case 2: return  1.5*pio2_hi+tiny;/*atan(+INF,-INF)*/
+		    case 3: return -1.5*pio2_hi-tiny;/*atan(-INF,-INF)*/
+		}
+	    } else {
+		switch(m) {
+		    case 0: return  zero  ;	/* atan(+...,+INF) */
+		    case 1: return -zero  ;	/* atan(-...,+INF) */
+		    case 2: return  pi+tiny  ;	/* atan(+...,-INF) */
+		    case 3: return -pi-tiny  ;	/* atan(-...,-INF) */
+		}
+	    }
+	}
+    /* when y is INF */
+	if(expty==BIAS+LDBL_MAX_EXP)
+	    return (expsigny<0)? -pio2_hi-tiny: pio2_hi+tiny;
+
+    /* compute y/x */
+	k = expty-exptx;
+	if(k > LDBL_MANT_DIG+2) z=pio2_hi+pio2_lo;	/* |y/x| huge */
+	else if(expsignx<0&&k<-LDBL_MANT_DIG-2) z=0.0; 	/* |y/x| tiny, x<0 */
+	else z=atanl(fabsl(y/x));		/* safe to do y/x */
+	switch (m) {
+	    case 0: return       z  ;	/* atan(+,+) */
+	    case 1: return      -z  ;	/* atan(-,+) */
+	    case 2: return  pi-(z-pi_lo);/* atan(+,-) */
+	    default: /* case 3 */
+	    	    return  (z-pi_lo)-pi;/* atan(-,-) */
+	}
+}