| 1 | /* Compute sine and cosine of argument. |
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| 2 | Copyright (C) 1997-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <errno.h> |
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| 20 | #include <math.h> |
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| 21 | |
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| 22 | #include <math_private.h> |
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| 23 | #include <libm-alias-ldouble.h> |
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| 24 | |
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| 25 | |
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| 26 | void |
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| 27 | __sincosl (long double x, long double *sinx, long double *cosx) |
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| 28 | { |
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| 29 | int32_t se, i0, i1 __attribute__ ((unused)); |
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| 30 | |
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| 31 | /* High word of x. */ |
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| 32 | GET_LDOUBLE_WORDS (se, i0, i1, x); |
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| 33 | |
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| 34 | /* |x| ~< pi/4 */ |
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| 35 | se &= 0x7fff; |
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| 36 | if (se < 0x3ffe || (se == 0x3ffe && i0 <= 0xc90fdaa2)) |
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| 37 | { |
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| 38 | *sinx = __kernel_sinl (x, 0.0, 0); |
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| 39 | *cosx = __kernel_cosl (x, 0.0); |
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| 40 | } |
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| 41 | else if (se == 0x7fff) |
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| 42 | { |
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| 43 | /* sin(Inf or NaN) is NaN */ |
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| 44 | *sinx = *cosx = x - x; |
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| 45 | if (isinf (x)) |
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| 46 | __set_errno (EDOM); |
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| 47 | } |
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| 48 | else |
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| 49 | { |
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| 50 | /* Argument reduction needed. */ |
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| 51 | long double y[2]; |
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| 52 | int n; |
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| 53 | |
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| 54 | n = __ieee754_rem_pio2l (x, y); |
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| 55 | switch (n & 3) |
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| 56 | { |
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| 57 | case 0: |
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| 58 | *sinx = __kernel_sinl (y[0], y[1], 1); |
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| 59 | *cosx = __kernel_cosl (y[0], y[1]); |
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| 60 | break; |
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| 61 | case 1: |
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| 62 | *sinx = __kernel_cosl (y[0], y[1]); |
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| 63 | *cosx = -__kernel_sinl (y[0], y[1], 1); |
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| 64 | break; |
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| 65 | case 2: |
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| 66 | *sinx = -__kernel_sinl (y[0], y[1], 1); |
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| 67 | *cosx = -__kernel_cosl (y[0], y[1]); |
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| 68 | break; |
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| 69 | default: |
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| 70 | *sinx = -__kernel_cosl (y[0], y[1]); |
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| 71 | *cosx = __kernel_sinl (y[0], y[1], 1); |
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| 72 | break; |
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| 73 | } |
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| 74 | } |
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| 75 | } |
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| 76 | libm_alias_ldouble (__sincos, sincos) |
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| 77 | |
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