lib/libm/src/catrigf.c

/*-
 * Copyright (c) 2012 Stephen Montgomery-Smith <stephen@FreeBSD.ORG>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD: head/lib/msun/src/catrigf.c 251404 2013-06-05 05:33:01Z das $
 */

/*
 * The algorithm is very close to that in "Implementing the complex arcsine
 * and arccosine functions using exception handling" by T. E. Hull, Thomas F.
 * Fairgrieve, and Ping Tak Peter Tang, published in ACM Transactions on
 * Mathematical Software, Volume 23 Issue 3, 1997, Pages 299-335,
 * http://dl.acm.org/citation.cfm?id=275324.
 *
 * See catrig.c for complete comments.
 *
 * XXX comments were removed automatically, and even short ones on the right
 * of statements were removed (all of them), contrary to normal style.  Only
 * a few comments on the right of declarations remain.
 */

#include <complex.h>
#include <float.h>

#include "math.h"
#include "math_private.h"

#undef isinf
#define isinf(x)	(fabsf(x) == INFINITY)
#undef isnan
#define isnan(x)	((x) != (x))
#define	raise_inexact()	do { volatile float junk = 1 + tiny; } while(0)
#undef signbit
#define signbit(x)	(__builtin_signbitf(x))

static const float
A_crossover =		10,
B_crossover =		0.6417,
FOUR_SQRT_MIN =		0x1p-61,
QUARTER_SQRT_MAX =	0x1p61,
m_e =			2.7182818285e0,		/*  0xadf854.0p-22 */
m_ln2 =			6.9314718056e-1,	/*  0xb17218.0p-24 */
pio2_hi =		1.5707962513e0,		/*  0xc90fda.0p-23 */
RECIP_EPSILON =		1 / FLT_EPSILON,
SQRT_3_EPSILON =	5.9801995673e-4,	/*  0x9cc471.0p-34 */
SQRT_6_EPSILON =	8.4572793338e-4,	/*  0xddb3d7.0p-34 */
SQRT_MIN =		0x1p-63;

static const volatile float
pio2_lo =		7.5497899549e-8,	/*  0xa22169.0p-47 */
tiny =			0x1p-100;

static float complex clog_for_large_values(float complex z);

static inline float
f(float a, float b, float hypot_a_b)
{
	if (b < 0)
		return ((hypot_a_b - b) / 2);
	if (b == 0)
		return (a / 2);
	return (a * a / (hypot_a_b + b) / 2);
}

static inline void
do_hard_work(float x, float y, float *rx, int *B_is_usable, float *B,
    float *sqrt_A2my2, float *new_y)
{
	float R, S, A;
	float Am1, Amy;

	R = hypotf(x, y + 1);
	S = hypotf(x, y - 1);

	A = (R + S) / 2;
	if (A < 1)
		A = 1;

	if (A < A_crossover) {
		if (y == 1 && x < FLT_EPSILON * FLT_EPSILON / 128) {
			*rx = sqrtf(x);
		} else if (x >= FLT_EPSILON * fabsf(y - 1)) {
			Am1 = f(x, 1 + y, R) + f(x, 1 - y, S);
			*rx = log1pf(Am1 + sqrtf(Am1 * (A + 1)));
		} else if (y < 1) {
			*rx = x / sqrtf((1 - y) * (1 + y));
		} else {
			*rx = log1pf((y - 1) + sqrtf((y - 1) * (y + 1)));
		}
	} else {
		*rx = logf(A + sqrtf(A * A - 1));
	}

	*new_y = y;

	if (y < FOUR_SQRT_MIN) {
		*B_is_usable = 0;
		*sqrt_A2my2 = A * (2 / FLT_EPSILON);
		*new_y = y * (2 / FLT_EPSILON);
		return;
	}

	*B = y / A;
	*B_is_usable = 1;

	if (*B > B_crossover) {
		*B_is_usable = 0;
		if (y == 1 && x < FLT_EPSILON / 128) {
			*sqrt_A2my2 = sqrtf(x) * sqrtf((A + y) / 2);
		} else if (x >= FLT_EPSILON * fabsf(y - 1)) {
			Amy = f(x, y + 1, R) + f(x, y - 1, S);
			*sqrt_A2my2 = sqrtf(Amy * (A + y));
		} else if (y > 1) {
			*sqrt_A2my2 = x * (4 / FLT_EPSILON / FLT_EPSILON) * y /
			    sqrtf((y + 1) * (y - 1));
			*new_y = y * (4 / FLT_EPSILON / FLT_EPSILON);
		} else {
			*sqrt_A2my2 = sqrtf((1 - y) * (1 + y));
		}
	}
}

float complex
casinhf(float complex z)
{
	float x, y, ax, ay, rx, ry, B, sqrt_A2my2, new_y;
	int B_is_usable;
	float complex w;

	x = crealf(z);
	y = cimagf(z);
	ax = fabsf(x);
	ay = fabsf(y);

	if (isnan(x) || isnan(y)) {
		if (isinf(x))
			return (cpackf(x, y + y));
		if (isinf(y))
			return (cpackf(y, x + x));
		if (y == 0)
			return (cpackf(x + x, y));
		return (cpackf(x + 0.0L + (y + 0), x + 0.0L + (y + 0)));
	}

	if (ax > RECIP_EPSILON || ay > RECIP_EPSILON) {
		if (signbit(x) == 0)
			w = clog_for_large_values(z) + m_ln2;
		else
			w = clog_for_large_values(-z) + m_ln2;
		return (cpackf(copysignf(crealf(w), x),
		    copysignf(cimagf(w), y)));
	}

	if (x == 0 && y == 0)
		return (z);

	raise_inexact();

	if (ax < SQRT_6_EPSILON / 4 && ay < SQRT_6_EPSILON / 4)
		return (z);

	do_hard_work(ax, ay, &rx, &B_is_usable, &B, &sqrt_A2my2, &new_y);
	if (B_is_usable)
		ry = asinf(B);
	else
		ry = atan2f(new_y, sqrt_A2my2);
	return (cpackf(copysignf(rx, x), copysignf(ry, y)));
}

float complex
casinf(float complex z)
{
	float complex w = casinhf(cpackf(cimagf(z), crealf(z)));

	return (cpackf(cimagf(w), crealf(w)));
}

float complex
cacosf(float complex z)
{
	float x, y, ax, ay, rx, ry, B, sqrt_A2mx2, new_x;
	int sx, sy;
	int B_is_usable;
	float complex w;

	x = crealf(z);
	y = cimagf(z);
	sx = signbit(x);
	sy = signbit(y);
	ax = fabsf(x);
	ay = fabsf(y);

	if (isnan(x) || isnan(y)) {
		if (isinf(x))
			return (cpackf(y + y, -INFINITY));
		if (isinf(y))
			return (cpackf(x + x, -y));
		if (x == 0)
			return (cpackf(pio2_hi + pio2_lo, y + y));
		return (cpackf(x + 0.0L + (y + 0), x + 0.0L + (y + 0)));
	}

	if (ax > RECIP_EPSILON || ay > RECIP_EPSILON) {
		w = clog_for_large_values(z);
		rx = fabsf(cimagf(w));
		ry = crealf(w) + m_ln2;
		if (sy == 0)
			ry = -ry;
		return (cpackf(rx, ry));
	}

	if (x == 1 && y == 0)
		return (cpackf(0, -y));

	raise_inexact();

	if (ax < SQRT_6_EPSILON / 4 && ay < SQRT_6_EPSILON / 4)
		return (cpackf(pio2_hi - (x - pio2_lo), -y));

	do_hard_work(ay, ax, &ry, &B_is_usable, &B, &sqrt_A2mx2, &new_x);
	if (B_is_usable) {
		if (sx == 0)
			rx = acosf(B);
		else
			rx = acosf(-B);
	} else {
		if (sx == 0)
			rx = atan2f(sqrt_A2mx2, new_x);
		else
			rx = atan2f(sqrt_A2mx2, -new_x);
	}
	if (sy == 0)
		ry = -ry;
	return (cpackf(rx, ry));
}

float complex
cacoshf(float complex z)
{
	float complex w;
	float rx, ry;

	w = cacosf(z);
	rx = crealf(w);
	ry = cimagf(w);
	if (isnan(rx) && isnan(ry))
		return (cpackf(ry, rx));
	if (isnan(rx))
		return (cpackf(fabsf(ry), rx));
	if (isnan(ry))
		return (cpackf(ry, ry));
	return (cpackf(fabsf(ry), copysignf(rx, cimagf(z))));
}

static float complex
clog_for_large_values(float complex z)
{
	float x, y;
	float ax, ay, t;

	x = crealf(z);
	y = cimagf(z);
	ax = fabsf(x);
	ay = fabsf(y);
	if (ax < ay) {
		t = ax;
		ax = ay;
		ay = t;
	}

	if (ax > FLT_MAX / 2)
		return (cpackf(logf(hypotf(x / m_e, y / m_e)) + 1,
		    atan2f(y, x)));

	if (ax > QUARTER_SQRT_MAX || ay < SQRT_MIN)
		return (cpackf(logf(hypotf(x, y)), atan2f(y, x)));

	return (cpackf(logf(ax * ax + ay * ay) / 2, atan2f(y, x)));
}

static inline float
sum_squares(float x, float y)
{

	if (y < SQRT_MIN)
		return (x * x);

	return (x * x + y * y);
}

static inline float
real_part_reciprocal(float x, float y)
{
	float scale;
	uint32_t hx, hy;
	int32_t ix, iy;

	GET_FLOAT_WORD(hx, x);
	ix = hx & 0x7f800000;
	GET_FLOAT_WORD(hy, y);
	iy = hy & 0x7f800000;
#define	BIAS	(FLT_MAX_EXP - 1)
#define	CUTOFF	(FLT_MANT_DIG / 2 + 1)
	if (ix - iy >= CUTOFF << 23 || isinf(x))
		return (1 / x);
	if (iy - ix >= CUTOFF << 23)
		return (x / y / y);
	if (ix <= (BIAS + FLT_MAX_EXP / 2 - CUTOFF) << 23)
		return (x / (x * x + y * y));
	SET_FLOAT_WORD(scale, 0x7f800000 - ix);
	x *= scale;
	y *= scale;
	return (x / (x * x + y * y) * scale);
}

float complex
catanhf(float complex z)
{
	float x, y, ax, ay, rx, ry;

	x = crealf(z);
	y = cimagf(z);
	ax = fabsf(x);
	ay = fabsf(y);

	if (y == 0 && ax <= 1)
		return (cpackf(atanhf(x), y));

	if (x == 0)
		return (cpackf(x, atanf(y)));

	if (isnan(x) || isnan(y)) {
		if (isinf(x))
			return (cpackf(copysignf(0, x), y + y));
		if (isinf(y))
			return (cpackf(copysignf(0, x),
			    copysignf(pio2_hi + pio2_lo, y)));
		return (cpackf(x + 0.0L + (y + 0), x + 0.0L + (y + 0)));
	}

	if (ax > RECIP_EPSILON || ay > RECIP_EPSILON)
		return (cpackf(real_part_reciprocal(x, y),
		    copysignf(pio2_hi + pio2_lo, y)));

	if (ax < SQRT_3_EPSILON / 2 && ay < SQRT_3_EPSILON / 2) {
		raise_inexact();
		return (z);
	}

	if (ax == 1 && ay < FLT_EPSILON)
		rx = (m_ln2 - logf(ay)) / 2;
	else
		rx = log1pf(4 * ax / sum_squares(ax - 1, ay)) / 4;

	if (ax == 1)
		ry = atan2f(2, -ay) / 2;
	else if (ay < FLT_EPSILON)
		ry = atan2f(2 * ay, (1 - ax) * (1 + ax)) / 2;
	else
		ry = atan2f(2 * ay, (1 - ax) * (1 + ax) - ay * ay) / 2;

	return (cpackf(copysignf(rx, x), copysignf(ry, y)));
}

float complex
catanf(float complex z)
{
	float complex w = catanhf(cpackf(cimagf(z), crealf(z)));

	return (cpackf(cimagf(w), crealf(w)));
}
Commit	Line	Data
	1	/*-
	2	* Copyright (c) 2012 Stephen Montgomery-Smith <stephen@FreeBSD.ORG>
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	*
	14	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	15	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	16	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	17	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	18	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	19	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	20	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	21	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	22	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	23	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	24	* SUCH DAMAGE.
	25	*
	26	* $FreeBSD: head/lib/msun/src/catrigf.c 251404 2013-06-05 05:33:01Z das $
	27	*/
	28
	29	/*
	30	* The algorithm is very close to that in "Implementing the complex arcsine
	31	* and arccosine functions using exception handling" by T. E. Hull, Thomas F.
	32	* Fairgrieve, and Ping Tak Peter Tang, published in ACM Transactions on
	33	* Mathematical Software, Volume 23 Issue 3, 1997, Pages 299-335,
	34	* http://dl.acm.org/citation.cfm?id=275324.
	35	*
	36	* See catrig.c for complete comments.
	37	*
	38	* XXX comments were removed automatically, and even short ones on the right
	39	* of statements were removed (all of them), contrary to normal style. Only
	40	* a few comments on the right of declarations remain.
	41	*/
	42
	43	#include <complex.h>
	44	#include <float.h>
	45
	46	#include "math.h"
	47	#include "math_private.h"
	48
	49	#undef isinf
	50	#define isinf(x) (fabsf(x) == INFINITY)
	51	#undef isnan
	52	#define isnan(x) ((x) != (x))
	53	#define raise_inexact() do { volatile float junk = 1 + tiny; } while(0)
	54	#undef signbit
	55	#define signbit(x) (__builtin_signbitf(x))
	56
	57	static const float
	58	A_crossover = 10,
	59	B_crossover = 0.6417,
	60	FOUR_SQRT_MIN = 0x1p-61,
	61	QUARTER_SQRT_MAX = 0x1p61,
	62	m_e = 2.7182818285e0, /* 0xadf854.0p-22 */
	63	m_ln2 = 6.9314718056e-1, /* 0xb17218.0p-24 */
	64	pio2_hi = 1.5707962513e0, /* 0xc90fda.0p-23 */
	65	RECIP_EPSILON = 1 / FLT_EPSILON,
	66	SQRT_3_EPSILON = 5.9801995673e-4, /* 0x9cc471.0p-34 */
	67	SQRT_6_EPSILON = 8.4572793338e-4, /* 0xddb3d7.0p-34 */
	68	SQRT_MIN = 0x1p-63;
	69
	70	static const volatile float
	71	pio2_lo = 7.5497899549e-8, /* 0xa22169.0p-47 */
	72	tiny = 0x1p-100;
	73
	74	static float complex clog_for_large_values(float complex z);
	75
	76	static inline float
	77	f(float a, float b, float hypot_a_b)
	78	{
	79	if (b < 0)
	80	return ((hypot_a_b - b) / 2);
	81	if (b == 0)
	82	return (a / 2);
	83	return (a * a / (hypot_a_b + b) / 2);
	84	}
	85
	86	static inline void
	87	do_hard_work(float x, float y, float rx, int B_is_usable, float *B,
	88	float sqrt_A2my2, float new_y)
	89	{
	90	float R, S, A;
	91	float Am1, Amy;
	92
	93	R = hypotf(x, y + 1);
	94	S = hypotf(x, y - 1);
	95
	96	A = (R + S) / 2;
	97	if (A < 1)
	98	A = 1;
	99
	100	if (A < A_crossover) {
	101	if (y == 1 && x < FLT_EPSILON * FLT_EPSILON / 128) {
	102	*rx = sqrtf(x);
	103	} else if (x >= FLT_EPSILON * fabsf(y - 1)) {
	104	Am1 = f(x, 1 + y, R) + f(x, 1 - y, S);
	105	rx = log1pf(Am1 + sqrtf(Am1 (A + 1)));
	106	} else if (y < 1) {
	107	rx = x / sqrtf((1 - y) (1 + y));
	108	} else {
	109	rx = log1pf((y - 1) + sqrtf((y - 1) (y + 1)));
	110	}
	111	} else {
	112	rx = logf(A + sqrtf(A A - 1));
	113	}
	114
	115	*new_y = y;
	116
	117	if (y < FOUR_SQRT_MIN) {
	118	*B_is_usable = 0;
	119	sqrt_A2my2 = A (2 / FLT_EPSILON);
	120	new_y = y (2 / FLT_EPSILON);
	121	return;
	122	}
	123
	124	*B = y / A;
	125	*B_is_usable = 1;
	126
	127	if (*B > B_crossover) {
	128	*B_is_usable = 0;
	129	if (y == 1 && x < FLT_EPSILON / 128) {
	130	sqrt_A2my2 = sqrtf(x) sqrtf((A + y) / 2);
	131	} else if (x >= FLT_EPSILON * fabsf(y - 1)) {
	132	Amy = f(x, y + 1, R) + f(x, y - 1, S);
	133	sqrt_A2my2 = sqrtf(Amy (A + y));
	134	} else if (y > 1) {
	135	sqrt_A2my2 = x (4 / FLT_EPSILON / FLT_EPSILON) * y /
	136	sqrtf((y + 1) * (y - 1));
	137	new_y = y (4 / FLT_EPSILON / FLT_EPSILON);
	138	} else {
	139	sqrt_A2my2 = sqrtf((1 - y) (1 + y));
	140	}
	141	}
	142	}
	143
	144	float complex
	145	casinhf(float complex z)
	146	{
	147	float x, y, ax, ay, rx, ry, B, sqrt_A2my2, new_y;
	148	int B_is_usable;
	149	float complex w;
	150
	151	x = crealf(z);
	152	y = cimagf(z);
	153	ax = fabsf(x);
	154	ay = fabsf(y);
	155
	156	if (isnan(x) \|\| isnan(y)) {
	157	if (isinf(x))
	158	return (cpackf(x, y + y));
	159	if (isinf(y))
	160	return (cpackf(y, x + x));
	161	if (y == 0)
	162	return (cpackf(x + x, y));
	163	return (cpackf(x + 0.0L + (y + 0), x + 0.0L + (y + 0)));
	164	}
	165
	166	if (ax > RECIP_EPSILON \|\| ay > RECIP_EPSILON) {
	167	if (signbit(x) == 0)
	168	w = clog_for_large_values(z) + m_ln2;
	169	else
	170	w = clog_for_large_values(-z) + m_ln2;
	171	return (cpackf(copysignf(crealf(w), x),
	172	copysignf(cimagf(w), y)));
	173	}
	174
	175	if (x == 0 && y == 0)
	176	return (z);
	177
	178	raise_inexact();
	179
	180	if (ax < SQRT_6_EPSILON / 4 && ay < SQRT_6_EPSILON / 4)
	181	return (z);
	182
	183	do_hard_work(ax, ay, &rx, &B_is_usable, &B, &sqrt_A2my2, &new_y);
	184	if (B_is_usable)
	185	ry = asinf(B);
	186	else
	187	ry = atan2f(new_y, sqrt_A2my2);
	188	return (cpackf(copysignf(rx, x), copysignf(ry, y)));
	189	}
	190
	191	float complex
	192	casinf(float complex z)
	193	{
	194	float complex w = casinhf(cpackf(cimagf(z), crealf(z)));
	195
	196	return (cpackf(cimagf(w), crealf(w)));
	197	}
	198
	199	float complex
	200	cacosf(float complex z)
	201	{
	202	float x, y, ax, ay, rx, ry, B, sqrt_A2mx2, new_x;
	203	int sx, sy;
	204	int B_is_usable;
	205	float complex w;
	206
	207	x = crealf(z);
	208	y = cimagf(z);
	209	sx = signbit(x);
	210	sy = signbit(y);
	211	ax = fabsf(x);
	212	ay = fabsf(y);
	213
	214	if (isnan(x) \|\| isnan(y)) {
	215	if (isinf(x))
	216	return (cpackf(y + y, -INFINITY));
	217	if (isinf(y))
	218	return (cpackf(x + x, -y));
	219	if (x == 0)
	220	return (cpackf(pio2_hi + pio2_lo, y + y));
	221	return (cpackf(x + 0.0L + (y + 0), x + 0.0L + (y + 0)));
	222	}
	223
	224	if (ax > RECIP_EPSILON \|\| ay > RECIP_EPSILON) {
	225	w = clog_for_large_values(z);
	226	rx = fabsf(cimagf(w));
	227	ry = crealf(w) + m_ln2;
	228	if (sy == 0)
	229	ry = -ry;
	230	return (cpackf(rx, ry));
	231	}
	232
	233	if (x == 1 && y == 0)
	234	return (cpackf(0, -y));
	235
	236	raise_inexact();
	237
	238	if (ax < SQRT_6_EPSILON / 4 && ay < SQRT_6_EPSILON / 4)
	239	return (cpackf(pio2_hi - (x - pio2_lo), -y));
	240
	241	do_hard_work(ay, ax, &ry, &B_is_usable, &B, &sqrt_A2mx2, &new_x);
	242	if (B_is_usable) {
	243	if (sx == 0)
	244	rx = acosf(B);
	245	else
	246	rx = acosf(-B);
	247	} else {
	248	if (sx == 0)
	249	rx = atan2f(sqrt_A2mx2, new_x);
	250	else
	251	rx = atan2f(sqrt_A2mx2, -new_x);
	252	}
	253	if (sy == 0)
	254	ry = -ry;
	255	return (cpackf(rx, ry));
	256	}
	257
	258	float complex
	259	cacoshf(float complex z)
	260	{
	261	float complex w;
	262	float rx, ry;
	263
	264	w = cacosf(z);
	265	rx = crealf(w);
	266	ry = cimagf(w);
	267	if (isnan(rx) && isnan(ry))
	268	return (cpackf(ry, rx));
	269	if (isnan(rx))
	270	return (cpackf(fabsf(ry), rx));
	271	if (isnan(ry))
	272	return (cpackf(ry, ry));
	273	return (cpackf(fabsf(ry), copysignf(rx, cimagf(z))));
	274	}
	275
	276	static float complex
	277	clog_for_large_values(float complex z)
	278	{
	279	float x, y;
	280	float ax, ay, t;
	281
	282	x = crealf(z);
	283	y = cimagf(z);
	284	ax = fabsf(x);
	285	ay = fabsf(y);
	286	if (ax < ay) {
	287	t = ax;
	288	ax = ay;
	289	ay = t;
	290	}
	291
	292	if (ax > FLT_MAX / 2)
	293	return (cpackf(logf(hypotf(x / m_e, y / m_e)) + 1,
	294	atan2f(y, x)));
	295
	296	if (ax > QUARTER_SQRT_MAX \|\| ay < SQRT_MIN)
	297	return (cpackf(logf(hypotf(x, y)), atan2f(y, x)));
	298
	299	return (cpackf(logf(ax * ax + ay * ay) / 2, atan2f(y, x)));
	300	}
	301
	302	static inline float
	303	sum_squares(float x, float y)
	304	{
	305
	306	if (y < SQRT_MIN)
	307	return (x * x);
	308
	309	return (x * x + y * y);
	310	}
	311
	312	static inline float
	313	real_part_reciprocal(float x, float y)
	314	{
	315	float scale;
	316	uint32_t hx, hy;
	317	int32_t ix, iy;
	318
	319	GET_FLOAT_WORD(hx, x);
	320	ix = hx & 0x7f800000;
	321	GET_FLOAT_WORD(hy, y);
	322	iy = hy & 0x7f800000;
	323	#define BIAS (FLT_MAX_EXP - 1)
	324	#define CUTOFF (FLT_MANT_DIG / 2 + 1)
	325	if (ix - iy >= CUTOFF << 23 \|\| isinf(x))
	326	return (1 / x);
	327	if (iy - ix >= CUTOFF << 23)
	328	return (x / y / y);
	329	if (ix <= (BIAS + FLT_MAX_EXP / 2 - CUTOFF) << 23)
	330	return (x / (x * x + y * y));
	331	SET_FLOAT_WORD(scale, 0x7f800000 - ix);
	332	x *= scale;
	333	y *= scale;
	334	return (x / (x * x + y * y) * scale);
	335	}
	336
	337	float complex
	338	catanhf(float complex z)
	339	{
	340	float x, y, ax, ay, rx, ry;
	341
	342	x = crealf(z);
	343	y = cimagf(z);
	344	ax = fabsf(x);
	345	ay = fabsf(y);
	346
	347	if (y == 0 && ax <= 1)
	348	return (cpackf(atanhf(x), y));
	349
	350	if (x == 0)
	351	return (cpackf(x, atanf(y)));
	352
	353	if (isnan(x) \|\| isnan(y)) {
	354	if (isinf(x))
	355	return (cpackf(copysignf(0, x), y + y));
	356	if (isinf(y))
	357	return (cpackf(copysignf(0, x),
	358	copysignf(pio2_hi + pio2_lo, y)));
	359	return (cpackf(x + 0.0L + (y + 0), x + 0.0L + (y + 0)));
	360	}
	361
	362	if (ax > RECIP_EPSILON \|\| ay > RECIP_EPSILON)
	363	return (cpackf(real_part_reciprocal(x, y),
	364	copysignf(pio2_hi + pio2_lo, y)));
	365
	366	if (ax < SQRT_3_EPSILON / 2 && ay < SQRT_3_EPSILON / 2) {
	367	raise_inexact();
	368	return (z);
	369	}
	370
	371	if (ax == 1 && ay < FLT_EPSILON)
	372	rx = (m_ln2 - logf(ay)) / 2;
	373	else
	374	rx = log1pf(4 * ax / sum_squares(ax - 1, ay)) / 4;
	375
	376	if (ax == 1)
	377	ry = atan2f(2, -ay) / 2;
	378	else if (ay < FLT_EPSILON)
	379	ry = atan2f(2 * ay, (1 - ax) * (1 + ax)) / 2;
	380	else
	381	ry = atan2f(2 * ay, (1 - ax) * (1 + ax) - ay * ay) / 2;
	382
	383	return (cpackf(copysignf(rx, x), copysignf(ry, y)));
	384	}
	385
	386	float complex
	387	catanf(float complex z)
	388	{
	389	float complex w = catanhf(cpackf(cimagf(z), crealf(z)));
	390
	391	return (cpackf(cimagf(w), crealf(w)));
	392	}