aboutsummaryrefslogtreecommitdiff
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 a4bb53d..0000000
--- 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(-,-) */
- }
-}