125c28e83SPiotr Jasiukajtis /*
225c28e83SPiotr Jasiukajtis * CDDL HEADER START
325c28e83SPiotr Jasiukajtis *
425c28e83SPiotr Jasiukajtis * The contents of this file are subject to the terms of the
525c28e83SPiotr Jasiukajtis * Common Development and Distribution License (the "License").
625c28e83SPiotr Jasiukajtis * You may not use this file except in compliance with the License.
725c28e83SPiotr Jasiukajtis *
825c28e83SPiotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
925c28e83SPiotr Jasiukajtis * or http://www.opensolaris.org/os/licensing.
1025c28e83SPiotr Jasiukajtis * See the License for the specific language governing permissions
1125c28e83SPiotr Jasiukajtis * and limitations under the License.
1225c28e83SPiotr Jasiukajtis *
1325c28e83SPiotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each
1425c28e83SPiotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
1525c28e83SPiotr Jasiukajtis * If applicable, add the following below this CDDL HEADER, with the
1625c28e83SPiotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying
1725c28e83SPiotr Jasiukajtis * information: Portions Copyright [yyyy] [name of copyright owner]
1825c28e83SPiotr Jasiukajtis *
1925c28e83SPiotr Jasiukajtis * CDDL HEADER END
2025c28e83SPiotr Jasiukajtis */
2125c28e83SPiotr Jasiukajtis /*
2225c28e83SPiotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
2325c28e83SPiotr Jasiukajtis */
2425c28e83SPiotr Jasiukajtis /*
2525c28e83SPiotr Jasiukajtis * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
2625c28e83SPiotr Jasiukajtis * Use is subject to license terms.
2725c28e83SPiotr Jasiukajtis */
2825c28e83SPiotr Jasiukajtis
29ddc0e0b5SRichard Lowe #pragma weak __sincosf = sincosf
3025c28e83SPiotr Jasiukajtis
3125c28e83SPiotr Jasiukajtis /* INDENT OFF */
3225c28e83SPiotr Jasiukajtis /*
3325c28e83SPiotr Jasiukajtis * For |x| < pi/4, let z = x * x, and approximate sin(x) by
3425c28e83SPiotr Jasiukajtis *
3525c28e83SPiotr Jasiukajtis * S(x) = x(S0 + S1*z)(S2 + S3*z + z*z)
3625c28e83SPiotr Jasiukajtis * where
3725c28e83SPiotr Jasiukajtis * S0 = 1.85735322054308378716204874632872525989806770558e-0003,
3825c28e83SPiotr Jasiukajtis * S1 = -1.95035094218403635082921458859320791358115801259e-0004,
3925c28e83SPiotr Jasiukajtis * S2 = 5.38400550766074785970952495168558701485841707252e+0002,
4025c28e83SPiotr Jasiukajtis * S3 = -3.31975110777873728964197739157371509422022905947e+0001,
4125c28e83SPiotr Jasiukajtis *
4225c28e83SPiotr Jasiukajtis * with error bounded by |(sin(x) - S(x))/x| < 2**(-28.2), and
4325c28e83SPiotr Jasiukajtis * cos(x) by
4425c28e83SPiotr Jasiukajtis *
4525c28e83SPiotr Jasiukajtis * C(x) = (C0 + C1*z + C2*z*z) * (C3 + C4*z + z*z)
4625c28e83SPiotr Jasiukajtis * where
4725c28e83SPiotr Jasiukajtis * C0 = 1.09349482127188401868272000389539985058873853699e-0003
4825c28e83SPiotr Jasiukajtis * C1 = -5.03324285989964979398034700054920226866107675091e-0004
4925c28e83SPiotr Jasiukajtis * C2 = 2.43792880266971107750418061559602239831538067410e-0005
5025c28e83SPiotr Jasiukajtis * C3 = 9.14499072605666582228127405245558035523741471271e+0002
5125c28e83SPiotr Jasiukajtis * C4 = -3.63151270591815439197122504991683846785293207730e+0001
5225c28e83SPiotr Jasiukajtis *
5325c28e83SPiotr Jasiukajtis * with error bounded by |cos(x) - C(x)| < 2**(-34.2).
5425c28e83SPiotr Jasiukajtis */
5525c28e83SPiotr Jasiukajtis /* INDENT ON */
5625c28e83SPiotr Jasiukajtis
5725c28e83SPiotr Jasiukajtis #include "libm.h"
5825c28e83SPiotr Jasiukajtis
5925c28e83SPiotr Jasiukajtis extern const int _TBL_ipio2_inf[];
6025c28e83SPiotr Jasiukajtis extern int __rem_pio2m(double *, double *, int, int, int, const int *);
6125c28e83SPiotr Jasiukajtis #if defined(__i386) && !defined(__amd64)
6225c28e83SPiotr Jasiukajtis extern int __swapRP(int);
6325c28e83SPiotr Jasiukajtis #endif
6425c28e83SPiotr Jasiukajtis
6525c28e83SPiotr Jasiukajtis static const double C[] = {
6625c28e83SPiotr Jasiukajtis 1.85735322054308378716204874632872525989806770558e-0003,
6725c28e83SPiotr Jasiukajtis -1.95035094218403635082921458859320791358115801259e-0004,
6825c28e83SPiotr Jasiukajtis 5.38400550766074785970952495168558701485841707252e+0002,
6925c28e83SPiotr Jasiukajtis -3.31975110777873728964197739157371509422022905947e+0001,
7025c28e83SPiotr Jasiukajtis 1.09349482127188401868272000389539985058873853699e-0003,
7125c28e83SPiotr Jasiukajtis -5.03324285989964979398034700054920226866107675091e-0004,
7225c28e83SPiotr Jasiukajtis 2.43792880266971107750418061559602239831538067410e-0005,
7325c28e83SPiotr Jasiukajtis 9.14499072605666582228127405245558035523741471271e+0002,
7425c28e83SPiotr Jasiukajtis -3.63151270591815439197122504991683846785293207730e+0001,
7525c28e83SPiotr Jasiukajtis 0.636619772367581343075535, /* 2^ -1 * 1.45F306DC9C883 */
7625c28e83SPiotr Jasiukajtis 0.5,
7725c28e83SPiotr Jasiukajtis 1.570796326734125614166, /* 2^ 0 * 1.921FB54400000 */
7825c28e83SPiotr Jasiukajtis 6.077100506506192601475e-11, /* 2^-34 * 1.0B4611A626331 */
7925c28e83SPiotr Jasiukajtis };
8025c28e83SPiotr Jasiukajtis
8125c28e83SPiotr Jasiukajtis #define S0 C[0]
8225c28e83SPiotr Jasiukajtis #define S1 C[1]
8325c28e83SPiotr Jasiukajtis #define S2 C[2]
8425c28e83SPiotr Jasiukajtis #define S3 C[3]
8525c28e83SPiotr Jasiukajtis #define C0 C[4]
8625c28e83SPiotr Jasiukajtis #define C1 C[5]
8725c28e83SPiotr Jasiukajtis #define C2 C[6]
8825c28e83SPiotr Jasiukajtis #define C3 C[7]
8925c28e83SPiotr Jasiukajtis #define C4 C[8]
9025c28e83SPiotr Jasiukajtis #define invpio2 C[9]
9125c28e83SPiotr Jasiukajtis #define half C[10]
9225c28e83SPiotr Jasiukajtis #define pio2_1 C[11]
9325c28e83SPiotr Jasiukajtis #define pio2_t C[12]
9425c28e83SPiotr Jasiukajtis
9525c28e83SPiotr Jasiukajtis void
sincosf(float x,float * s,float * c)9625c28e83SPiotr Jasiukajtis sincosf(float x, float *s, float *c)
9725c28e83SPiotr Jasiukajtis {
9825c28e83SPiotr Jasiukajtis double y, z, w;
9925c28e83SPiotr Jasiukajtis float f, g;
10025c28e83SPiotr Jasiukajtis int n, ix, hx, hy;
101*862246c1SToomas Soome volatile int i __unused;
10225c28e83SPiotr Jasiukajtis
10325c28e83SPiotr Jasiukajtis hx = *((int *)&x);
10425c28e83SPiotr Jasiukajtis ix = hx & 0x7fffffff;
10525c28e83SPiotr Jasiukajtis
10625c28e83SPiotr Jasiukajtis y = (double)x;
10725c28e83SPiotr Jasiukajtis
10825c28e83SPiotr Jasiukajtis if (ix <= 0x4016cbe4) { /* |x| < 3*pi/4 */
10925c28e83SPiotr Jasiukajtis if (ix <= 0x3f490fdb) { /* |x| < pi/4 */
11025c28e83SPiotr Jasiukajtis if (ix <= 0x39800000) { /* |x| <= 2**-12 */
11125c28e83SPiotr Jasiukajtis i = (int)y;
11225c28e83SPiotr Jasiukajtis #ifdef lint
11325c28e83SPiotr Jasiukajtis i = i;
11425c28e83SPiotr Jasiukajtis #endif
11525c28e83SPiotr Jasiukajtis *s = x;
11625c28e83SPiotr Jasiukajtis *c = 1.0f;
11725c28e83SPiotr Jasiukajtis return;
11825c28e83SPiotr Jasiukajtis }
11925c28e83SPiotr Jasiukajtis z = y * y;
12025c28e83SPiotr Jasiukajtis *s = (float)((y * (S0 + z * S1)) *
12125c28e83SPiotr Jasiukajtis (S2 + z * (S3 + z)));
12225c28e83SPiotr Jasiukajtis *c = (float)(((C0 + z * C1) + (z * z) * C2) *
12325c28e83SPiotr Jasiukajtis (C3 + z * (C4 + z)));
12425c28e83SPiotr Jasiukajtis } else if (hx > 0) {
12525c28e83SPiotr Jasiukajtis y = (y - pio2_1) - pio2_t;
12625c28e83SPiotr Jasiukajtis z = y * y;
12725c28e83SPiotr Jasiukajtis *s = (float)(((C0 + z * C1) + (z * z) * C2) *
12825c28e83SPiotr Jasiukajtis (C3 + z * (C4 + z)));
12925c28e83SPiotr Jasiukajtis *c = (float)-((y * (S0 + z * S1)) *
13025c28e83SPiotr Jasiukajtis (S2 + z * (S3 + z)));
13125c28e83SPiotr Jasiukajtis } else {
13225c28e83SPiotr Jasiukajtis y = (y + pio2_1) + pio2_t;
13325c28e83SPiotr Jasiukajtis z = y * y;
13425c28e83SPiotr Jasiukajtis *s = (float)-(((C0 + z * C1) + (z * z) * C2) *
13525c28e83SPiotr Jasiukajtis (C3 + z * (C4 + z)));
13625c28e83SPiotr Jasiukajtis *c = (float)((y * (S0 + z * S1)) *
13725c28e83SPiotr Jasiukajtis (S2 + z * (S3 + z)));
13825c28e83SPiotr Jasiukajtis }
13925c28e83SPiotr Jasiukajtis return;
14025c28e83SPiotr Jasiukajtis } else if (ix <= 0x49c90fdb) { /* |x| < 2^19*pi */
14125c28e83SPiotr Jasiukajtis #if defined(__i386) && !defined(__amd64)
14225c28e83SPiotr Jasiukajtis int rp;
14325c28e83SPiotr Jasiukajtis
14425c28e83SPiotr Jasiukajtis rp = __swapRP(fp_extended);
14525c28e83SPiotr Jasiukajtis #endif
14625c28e83SPiotr Jasiukajtis w = y * invpio2;
14725c28e83SPiotr Jasiukajtis if (hx < 0)
14825c28e83SPiotr Jasiukajtis n = (int)(w - half);
14925c28e83SPiotr Jasiukajtis else
15025c28e83SPiotr Jasiukajtis n = (int)(w + half);
15125c28e83SPiotr Jasiukajtis y = (y - n * pio2_1) - n * pio2_t;
15225c28e83SPiotr Jasiukajtis #if defined(__i386) && !defined(__amd64)
15325c28e83SPiotr Jasiukajtis if (rp != fp_extended)
15425c28e83SPiotr Jasiukajtis (void) __swapRP(rp);
15525c28e83SPiotr Jasiukajtis #endif
15625c28e83SPiotr Jasiukajtis } else {
15725c28e83SPiotr Jasiukajtis if (ix >= 0x7f800000) {
15825c28e83SPiotr Jasiukajtis *s = *c = x / x;
15925c28e83SPiotr Jasiukajtis return;
16025c28e83SPiotr Jasiukajtis }
16125c28e83SPiotr Jasiukajtis hy = ((int *)&y)[HIWORD];
16225c28e83SPiotr Jasiukajtis n = ((hy >> 20) & 0x7ff) - 1046;
16325c28e83SPiotr Jasiukajtis ((int *)&w)[HIWORD] = (hy & 0xfffff) | 0x41600000;
16425c28e83SPiotr Jasiukajtis ((int *)&w)[LOWORD] = ((int *)&y)[LOWORD];
16525c28e83SPiotr Jasiukajtis n = __rem_pio2m(&w, &y, n, 1, 0, _TBL_ipio2_inf);
16625c28e83SPiotr Jasiukajtis if (hy < 0) {
16725c28e83SPiotr Jasiukajtis y = -y;
16825c28e83SPiotr Jasiukajtis n = -n;
16925c28e83SPiotr Jasiukajtis }
17025c28e83SPiotr Jasiukajtis }
17125c28e83SPiotr Jasiukajtis
17225c28e83SPiotr Jasiukajtis z = y * y;
17325c28e83SPiotr Jasiukajtis f = (float)((y * (S0 + z * S1)) * (S2 + z * (S3 + z)));
17425c28e83SPiotr Jasiukajtis g = (float)(((C0 + z * C1) + (z * z) * C2) *
17525c28e83SPiotr Jasiukajtis (C3 + z * (C4 + z)));
17625c28e83SPiotr Jasiukajtis if (n & 2) {
17725c28e83SPiotr Jasiukajtis f = -f;
17825c28e83SPiotr Jasiukajtis g = -g;
17925c28e83SPiotr Jasiukajtis }
18025c28e83SPiotr Jasiukajtis if (n & 1) {
18125c28e83SPiotr Jasiukajtis *s = g;
18225c28e83SPiotr Jasiukajtis *c = -f;
18325c28e83SPiotr Jasiukajtis } else {
18425c28e83SPiotr Jasiukajtis *s = f;
18525c28e83SPiotr Jasiukajtis *c = g;
18625c28e83SPiotr Jasiukajtis }
18725c28e83SPiotr Jasiukajtis }
188