mirror of
https://github.com/jart/cosmopolitan.git
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592f6ebc20
- Write some more unit tests - memcpy() on ARM is now faster - Address the Musl complex math FIXME comments - Some libm funcs like pow() now support setting errno - Import the latest and greatest math functions from ARM - Use more accurate atan2f() and log1pf() implementations - atoi() and atol() will no longer saturate or clobber errno
103 lines
4.4 KiB
C
103 lines
4.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╚──────────────────────────────────────────────────────────────────────────────╝
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│ │
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│ Optimized Routines │
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│ Copyright (c) 2018-2024, Arm Limited. │
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│ │
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│ Permission is hereby granted, free of charge, to any person obtaining │
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│ a copy of this software and associated documentation files (the │
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│ "Software"), to deal in the Software without restriction, including │
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│ without limitation the rights to use, copy, modify, merge, publish, │
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│ distribute, sublicense, and/or sell copies of the Software, and to │
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│ permit persons to whom the Software is furnished to do so, subject to │
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│ the following conditions: │
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│ │
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│ The above copyright notice and this permission notice shall be │
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│ included in all copies or substantial portions of the Software. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
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│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
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│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
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│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
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│ │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/tinymath/sincosf.internal.h"
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__static_yoink("arm_optimized_routines_notice");
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/**
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* Returns sine and cosine of y.
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*
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* This is a fast sincosf implementation. Worst-case ULP is 0.5607,
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* maximum relative error is 0.5303 * 2^-23. A single-step range
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* reduction is used for small values. Large inputs have their range
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* reduced using fast integer arithmetic.
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*
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* @raise EDOM if y is an infinity
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*/
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void
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sincosf (float y, float *sinp, float *cosp)
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{
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double x = y;
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double s;
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int n;
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const sincos_t *p = &__sincosf_table[0];
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if (abstop12 (y) < abstop12 (pio4f))
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{
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double x2 = x * x;
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if (unlikely (abstop12 (y) < abstop12 (0x1p-12f)))
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{
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if (unlikely (abstop12 (y) < abstop12 (0x1p-126f)))
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/* Force underflow for tiny y. */
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force_eval_float (x2);
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*sinp = y;
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*cosp = 1.0f;
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return;
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}
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sincosf_poly (x, x2, p, 0, sinp, cosp);
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}
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else if (abstop12 (y) < abstop12 (120.0f))
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{
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x = reduce_fast (x, p, &n);
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/* Setup the signs for sin and cos. */
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s = p->sign[n & 3];
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if (n & 2)
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p = &__sincosf_table[1];
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sincosf_poly (x * s, x * x, p, n, sinp, cosp);
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}
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else if (likely (abstop12 (y) < abstop12 (INFINITY)))
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{
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uint32_t xi = asuint (y);
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int sign = xi >> 31;
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x = reduce_large (xi, &n);
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/* Setup signs for sin and cos - include original sign. */
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s = p->sign[(n + sign) & 3];
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if ((n + sign) & 2)
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p = &__sincosf_table[1];
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sincosf_poly (x * s, x * x, p, n, sinp, cosp);
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}
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else
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{
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/* Return NaN if Inf or NaN for both sin and cos. */
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*sinp = *cosp = y - y;
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#if WANT_ERRNO
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/* Needed to set errno for +-Inf, the add is a hack to work
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around a gcc register allocation issue: just passing y
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affects code generation in the fast path. */
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__math_invalidf (y + y);
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#endif
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}
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}
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