mirror of
git://sourceware.org/git/newlib-cygwin.git
synced 2025-01-19 04:49:25 +08:00
cbe50607fb
Synchronize code style and comments with Arm Optimized Routines, there are no code changes in this patch. This ensures different projects using the same code have consistent code style so bug fix patches can be applied more easily.
93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
/* Single-precision sin function.
|
|
Copyright (c) 2018 Arm Ltd. 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.
|
|
3. The name of the company may not be used to endorse or promote
|
|
products derived from this software without specific prior written
|
|
permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY ARM LTD ``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 ARM LTD 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. */
|
|
|
|
#include "fdlibm.h"
|
|
#if !__OBSOLETE_MATH
|
|
|
|
#include <math.h>
|
|
#include "math_config.h"
|
|
#include "sincosf.h"
|
|
|
|
/* Fast sinf implementation. Worst-case ULP is 0.56072, maximum relative
|
|
error is 0.5303p-23. A single-step signed range reduction is used for
|
|
small values. Large inputs have their range reduced using fast integer
|
|
arithmetic.
|
|
*/
|
|
float
|
|
sinf (float y)
|
|
{
|
|
double x = y;
|
|
double s;
|
|
int n;
|
|
sincos_t *p = &sincosf_table[0];
|
|
|
|
if (abstop12 (y) < abstop12 (pio4))
|
|
{
|
|
s = x * x;
|
|
|
|
if (unlikely (abstop12 (y) < abstop12 (0x1p-12f)))
|
|
{
|
|
if (unlikely (abstop12 (y) < abstop12 (0x1p-126f)))
|
|
/* Force underflow for tiny y. */
|
|
force_eval_float (s);
|
|
return y;
|
|
}
|
|
|
|
return sinf_poly (x, s, p, 0);
|
|
}
|
|
else if (likely (abstop12 (y) < abstop12 (120.0f)))
|
|
{
|
|
x = reduce_fast (x, p, &n);
|
|
|
|
/* Setup the signs for sin and cos. */
|
|
s = p->sign[n & 3];
|
|
|
|
if (n & 2)
|
|
p = &sincosf_table[1];
|
|
|
|
return sinf_poly (x * s, x * x, p, n);
|
|
}
|
|
else if (abstop12 (y) < abstop12 (INFINITY))
|
|
{
|
|
uint32_t xi = asuint (y);
|
|
int sign = xi >> 31;
|
|
|
|
x = reduce_large (xi, &n);
|
|
|
|
/* Setup signs for sin and cos - include original sign. */
|
|
s = p->sign[(n + sign) & 3];
|
|
|
|
if ((n + sign) & 2)
|
|
p = &sincosf_table[1];
|
|
|
|
return sinf_poly (x * s, x * x, p, n);
|
|
}
|
|
else
|
|
return __math_invalidf (y);
|
|
}
|
|
|
|
#endif
|