about summary refs log tree commit diff
path: root/sysdeps/ieee754/ldbl-128ibm/e_atan2l.c
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/ieee754/ldbl-128ibm/e_atan2l.c')
-rw-r--r--sysdeps/ieee754/ldbl-128ibm/e_atan2l.c124
1 files changed, 0 insertions, 124 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm/e_atan2l.c b/sysdeps/ieee754/ldbl-128ibm/e_atan2l.c
deleted file mode 100644
index a4bb53df04..0000000000
--- a/sysdeps/ieee754/ldbl-128ibm/e_atan2l.c
+++ /dev/null
@@ -1,124 +0,0 @@
-/* e_atan2l.c -- long double version of e_atan2.c.
- * Conversion to long double by Jakub Jelinek, jj@ultra.linux.cz.
- */
-
-/*
- * ====================================================
- * 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.
- * ====================================================
- */
-
-/* __ieee754_atan2l(y,x)
- * Method :
- *	1. Reduce y to positive by atan2l(y,x)=-atan2l(-y,x).
- *	2. Reduce x to positive by (if x and y are unexceptional):
- *		ARG (x+iy) = arctan(y/x)   	   ... if x > 0,
- *		ARG (x+iy) = pi - arctan[y/(-x)]   ... if x < 0,
- *
- * Special cases:
- *
- *	ATAN2((anything), NaN ) is NaN;
- *	ATAN2(NAN , (anything) ) is NaN;
- *	ATAN2(+-0, +(anything but NaN)) is +-0  ;
- *	ATAN2(+-0, -(anything but NaN)) is +-pi ;
- *	ATAN2(+-(anything but 0 and NaN), 0) is +-pi/2;
- *	ATAN2(+-(anything but INF and NaN), +INF) is +-0 ;
- *	ATAN2(+-(anything but INF and NaN), -INF) is +-pi;
- *	ATAN2(+-INF,+INF ) is +-pi/4 ;
- *	ATAN2(+-INF,-INF ) is +-3pi/4;
- *	ATAN2(+-INF, (anything but,0,NaN, and INF)) is +-pi/2;
- *
- * Constants:
- * The hexadecimal values are the intended ones for the following
- * constants. The decimal values may be used, provided that the
- * compiler will convert from decimal to binary accurately enough
- * to produce the hexadecimal values shown.
- */
-
-#include "math.h"
-#include "math_private.h"
-
-#ifdef __STDC__
-static const long double
-#else
-static long double
-#endif
-tiny  = 1.0e-300L,
-zero  = 0.0,
-pi_o_4  = 7.85398163397448309615660845819875699e-01L, /* 3ffe921fb54442d18469898cc51701b8 */
-pi_o_2  = 1.57079632679489661923132169163975140e+00L, /* 3fff921fb54442d18469898cc51701b8 */
-pi      = 3.14159265358979323846264338327950280e+00L, /* 4000921fb54442d18469898cc51701b8 */
-pi_lo   = 8.67181013012378102479704402604335225e-35L; /* 3f8dcd129024e088a67cc74020bbea64 */
-
-#ifdef __STDC__
-	long double __ieee754_atan2l(long double y, long double x)
-#else
-	long double __ieee754_atan2l(y,x)
-	long double  y,x;
-#endif
-{
-	long double z;
-	int64_t k,m,hx,hy,ix,iy;
-	u_int64_t lx,ly;
-
-	GET_LDOUBLE_WORDS64(hx,lx,x);
-	ix = hx&0x7fffffffffffffffLL;
-	GET_LDOUBLE_WORDS64(hy,ly,y);
-	iy = hy&0x7fffffffffffffffLL;
-	if(((ix)>0x7ff0000000000000LL)||
-	   ((iy)>0x7ff0000000000000LL))	/* x or y is NaN */
-	   return x+y;
-	if(((hx-0x3ff0000000000000LL))==0) return __atanl(y);   /* x=1.0L */
-	m = ((hy>>63)&1)|((hx>>62)&2);	/* 2*sign(x)+sign(y) */
-
-    /* when y = 0 */
-	if((iy|(ly&0x7fffffffffffffffLL))==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((ix|(lx&0x7fffffffffffffff))==0) return (hy<0)?  -pi_o_2-tiny: pi_o_2+tiny;
-
-    /* when x is INF */
-	if(ix==0x7ff0000000000000LL) {
-	    if(iy==0x7ff0000000000000LL) {
-		switch(m) {
-		    case 0: return  pi_o_4+tiny;/* atan(+INF,+INF) */
-		    case 1: return -pi_o_4-tiny;/* atan(-INF,+INF) */
-		    case 2: return  3.0L*pi_o_4+tiny;/*atan(+INF,-INF)*/
-		    case 3: return -3.0L*pi_o_4-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(iy==0x7ff0000000000000LL) return (hy<0)? -pi_o_2-tiny: pi_o_2+tiny;
-
-    /* compute y/x */
-	k = (iy-ix)>>52;
-	if(k > 120) z=pi_o_2+0.5L*pi_lo; 	/* |y/x| >  2**120 */
-	else if(hx<0&&k<-120) z=0.0L; 		/* |y|/x < -2**120 */
-	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(-,-) */
-	}
-}