| e_atan2.c (181062) | e_atan2.c (181074) |
|---|---|
| 1 2/* @(#)e_atan2.c 1.3 95/01/18 */ 3/* 4 * ==================================================== 5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 6 * 7 * Developed at SunSoft, a Sun Microsystems, Inc. business. 8 * Permission to use, copy, modify, and distribute this 9 * software is freely granted, provided that this notice 10 * is preserved. 11 * ==================================================== 12 * 13 */ 14 15#include <sys/cdefs.h> | 1 2/* @(#)e_atan2.c 1.3 95/01/18 */ 3/* 4 * ==================================================== 5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 6 * 7 * Developed at SunSoft, a Sun Microsystems, Inc. business. 8 * Permission to use, copy, modify, and distribute this 9 * software is freely granted, provided that this notice 10 * is preserved. 11 * ==================================================== 12 * 13 */ 14 15#include <sys/cdefs.h> |
| 16__FBSDID("$FreeBSD: head/lib/msun/src/e_atan2.c 181062 2008-07-31 19:57:50Z das $"); | 16__FBSDID("$FreeBSD: head/lib/msun/src/e_atan2.c 181074 2008-07-31 22:41:26Z das $"); |
| 17 18/* __ieee754_atan2(y,x) 19 * Method : 20 * 1. Reduce y to positive by atan2(y,x)=-atan2(-y,x). 21 * 2. Reduce x to positive by (if x and y are unexceptional): 22 * ARG (x+iy) = arctan(y/x) ... if x > 0, 23 * ARG (x+iy) = pi - arctan[y/(-x)] ... if x < 0, 24 * --- 12 unchanged lines hidden (view full) --- 37 * 38 * Constants: 39 * The hexadecimal values are the intended ones for the following 40 * constants. The decimal values may be used, provided that the 41 * compiler will convert from decimal to binary accurately enough 42 * to produce the hexadecimal values shown. 43 */ 44 | 17 18/* __ieee754_atan2(y,x) 19 * Method : 20 * 1. Reduce y to positive by atan2(y,x)=-atan2(-y,x). 21 * 2. Reduce x to positive by (if x and y are unexceptional): 22 * ARG (x+iy) = arctan(y/x) ... if x > 0, 23 * ARG (x+iy) = pi - arctan[y/(-x)] ... if x < 0, 24 * --- 12 unchanged lines hidden (view full) --- 37 * 38 * Constants: 39 * The hexadecimal values are the intended ones for the following 40 * constants. The decimal values may be used, provided that the 41 * compiler will convert from decimal to binary accurately enough 42 * to produce the hexadecimal values shown. 43 */ 44 |
| 45#include <float.h> 46 |
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| 45#include "math.h" 46#include "math_private.h" 47 48static volatile double 49tiny = 1.0e-300; 50static const double 51zero = 0.0, 52pi_o_4 = 7.8539816339744827900E-01, /* 0x3FE921FB, 0x54442D18 */ --- 65 unchanged lines hidden (view full) --- 118 SET_HIGH_WORD(z,zh ^ 0x80000000); 119 } 120 return z ; /* atan(-,+) */ 121 case 2: return pi-(z-pi_lo);/* atan(+,-) */ 122 default: /* case 3 */ 123 return (z-pi_lo)-pi;/* atan(-,-) */ 124 } 125} | 47#include "math.h" 48#include "math_private.h" 49 50static volatile double 51tiny = 1.0e-300; 52static const double 53zero = 0.0, 54pi_o_4 = 7.8539816339744827900E-01, /* 0x3FE921FB, 0x54442D18 */ --- 65 unchanged lines hidden (view full) --- 120 SET_HIGH_WORD(z,zh ^ 0x80000000); 121 } 122 return z ; /* atan(-,+) */ 123 case 2: return pi-(z-pi_lo);/* atan(+,-) */ 124 default: /* case 3 */ 125 return (z-pi_lo)-pi;/* atan(-,-) */ 126 } 127} |
| 128 129#if LDBL_MANT_DIG == 53 130__weak_reference(atan2, atan2l); 131#endif |
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