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annotate libquadmath/math/cosq_kernel.c @ 158:494b0b89df80 default tip

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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 25 May 2020 18:13:55 +0900
parents 1830386684a0
children
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rev   line source
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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1 /* Quad-precision floating point cosine on <-pi/4,pi/4>.
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2 Copyright (C) 1999-2018 Free Software Foundation, Inc.
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3 This file is part of the GNU C Library.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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4 Contributed by Jakub Jelinek <jj@ultra.linux.cz>
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5
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6 The GNU C Library is free software; you can redistribute it and/or
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7 modify it under the terms of the GNU Lesser General Public
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8 License as published by the Free Software Foundation; either
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9 version 2.1 of the License, or (at your option) any later version.
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10
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11 The GNU C Library is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 Lesser General Public License for more details.
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15
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16 You should have received a copy of the GNU Lesser General Public
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17 License along with the GNU C Library; if not, see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #include "quadmath-imp.h"
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21
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22 static const __float128 c[] = {
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23 #define ONE c[0]
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24 1.00000000000000000000000000000000000E+00Q, /* 3fff0000000000000000000000000000 */
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25
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26 /* cos x ~ ONE + x^2 ( SCOS1 + SCOS2 * x^2 + ... + SCOS4 * x^6 + SCOS5 * x^8 )
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27 x in <0,1/256> */
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28 #define SCOS1 c[1]
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29 #define SCOS2 c[2]
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30 #define SCOS3 c[3]
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31 #define SCOS4 c[4]
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32 #define SCOS5 c[5]
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33 -5.00000000000000000000000000000000000E-01Q, /* bffe0000000000000000000000000000 */
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34 4.16666666666666666666666666556146073E-02Q, /* 3ffa5555555555555555555555395023 */
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35 -1.38888888888888888888309442601939728E-03Q, /* bff56c16c16c16c16c16a566e42c0375 */
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36 2.48015873015862382987049502531095061E-05Q, /* 3fefa01a01a019ee02dcf7da2d6d5444 */
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37 -2.75573112601362126593516899592158083E-07Q, /* bfe927e4f5dce637cb0b54908754bde0 */
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38
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39 /* cos x ~ ONE + x^2 ( COS1 + COS2 * x^2 + ... + COS7 * x^12 + COS8 * x^14 )
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40 x in <0,0.1484375> */
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41 #define COS1 c[6]
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42 #define COS2 c[7]
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43 #define COS3 c[8]
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44 #define COS4 c[9]
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45 #define COS5 c[10]
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46 #define COS6 c[11]
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47 #define COS7 c[12]
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48 #define COS8 c[13]
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49 -4.99999999999999999999999999999999759E-01Q, /* bffdfffffffffffffffffffffffffffb */
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50 4.16666666666666666666666666651287795E-02Q, /* 3ffa5555555555555555555555516f30 */
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51 -1.38888888888888888888888742314300284E-03Q, /* bff56c16c16c16c16c16c16a463dfd0d */
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52 2.48015873015873015867694002851118210E-05Q, /* 3fefa01a01a01a01a0195cebe6f3d3a5 */
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53 -2.75573192239858811636614709689300351E-07Q, /* bfe927e4fb7789f5aa8142a22044b51f */
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54 2.08767569877762248667431926878073669E-09Q, /* 3fe21eed8eff881d1e9262d7adff4373 */
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55 -1.14707451049343817400420280514614892E-11Q, /* bfda9397496922a9601ed3d4ca48944b */
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56 4.77810092804389587579843296923533297E-14Q, /* 3fd2ae5f8197cbcdcaf7c3fb4523414c */
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57
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58 /* sin x ~ ONE * x + x^3 ( SSIN1 + SSIN2 * x^2 + ... + SSIN4 * x^6 + SSIN5 * x^8 )
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59 x in <0,1/256> */
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60 #define SSIN1 c[14]
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61 #define SSIN2 c[15]
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62 #define SSIN3 c[16]
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63 #define SSIN4 c[17]
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64 #define SSIN5 c[18]
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65 -1.66666666666666666666666666666666659E-01Q, /* bffc5555555555555555555555555555 */
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66 8.33333333333333333333333333146298442E-03Q, /* 3ff81111111111111111111110fe195d */
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67 -1.98412698412698412697726277416810661E-04Q, /* bff2a01a01a01a01a019e7121e080d88 */
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68 2.75573192239848624174178393552189149E-06Q, /* 3fec71de3a556c640c6aaa51aa02ab41 */
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69 -2.50521016467996193495359189395805639E-08Q, /* bfe5ae644ee90c47dc71839de75b2787 */
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70 };
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71
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72 #define SINCOSL_COS_HI 0
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73 #define SINCOSL_COS_LO 1
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74 #define SINCOSL_SIN_HI 2
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75 #define SINCOSL_SIN_LO 3
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76 extern const __float128 __sincosq_table[];
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77
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78 __float128
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79 __quadmath_kernel_cosq(__float128 x, __float128 y)
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80 {
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81 __float128 h, l, z, sin_l, cos_l_m1;
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82 int64_t ix;
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83 uint32_t tix, hix, index;
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84 GET_FLT128_MSW64 (ix, x);
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85 tix = ((uint64_t)ix) >> 32;
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86 tix &= ~0x80000000; /* tix = |x|'s high 32 bits */
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87 if (tix < 0x3ffc3000) /* |x| < 0.1484375 */
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88 {
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89 /* Argument is small enough to approximate it by a Chebyshev
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90 polynomial of degree 16. */
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91 if (tix < 0x3fc60000) /* |x| < 2^-57 */
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92 if (!((int)x)) return ONE; /* generate inexact */
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93 z = x * x;
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94 return ONE + (z*(COS1+z*(COS2+z*(COS3+z*(COS4+
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95 z*(COS5+z*(COS6+z*(COS7+z*COS8))))))));
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96 }
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97 else
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98 {
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99 /* So that we don't have to use too large polynomial, we find
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100 l and h such that x = l + h, where fabsq(l) <= 1.0/256 with 83
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101 possible values for h. We look up cosq(h) and sinq(h) in
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102 pre-computed tables, compute cosq(l) and sinq(l) using a
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103 Chebyshev polynomial of degree 10(11) and compute
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104 cosq(h+l) = cosq(h)cosq(l) - sinq(h)sinq(l). */
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105 index = 0x3ffe - (tix >> 16);
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106 hix = (tix + (0x200 << index)) & (0xfffffc00 << index);
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107 if (signbitq (x))
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108 {
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109 x = -x;
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110 y = -y;
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111 }
68
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112 switch (index)
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113 {
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114 case 0: index = ((45 << 10) + hix - 0x3ffe0000) >> 8; break;
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115 case 1: index = ((13 << 11) + hix - 0x3ffd0000) >> 9; break;
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116 default:
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117 case 2: index = (hix - 0x3ffc3000) >> 10; break;
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118 }
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119
561a7518be6b update gcc-4.6
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
120 SET_FLT128_WORDS64(h, ((uint64_t)hix) << 32, 0);
561a7518be6b update gcc-4.6
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
121 l = y - (h - x);
561a7518be6b update gcc-4.6
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
122 z = l * l;
561a7518be6b update gcc-4.6
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
123 sin_l = l*(ONE+z*(SSIN1+z*(SSIN2+z*(SSIN3+z*(SSIN4+z*SSIN5)))));
561a7518be6b update gcc-4.6
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
124 cos_l_m1 = z*(SCOS1+z*(SCOS2+z*(SCOS3+z*(SCOS4+z*SCOS5))));
145
1830386684a0 gcc-9.2.0
anatofuz
parents: 111
diff changeset
125 return __sincosq_table [index + SINCOSL_COS_HI]
1830386684a0 gcc-9.2.0
anatofuz
parents: 111
diff changeset
126 + (__sincosq_table [index + SINCOSL_COS_LO]
1830386684a0 gcc-9.2.0
anatofuz
parents: 111
diff changeset
127 - (__sincosq_table [index + SINCOSL_SIN_HI] * sin_l
1830386684a0 gcc-9.2.0
anatofuz
parents: 111
diff changeset
128 - __sincosq_table [index + SINCOSL_COS_HI] * cos_l_m1));
68
561a7518be6b update gcc-4.6
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
129 }
561a7518be6b update gcc-4.6
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
130 }