64 lines
2.6 KiB
C
64 lines
2.6 KiB
C
/* expm1f4 -
|
|
Copyright (C) 2006, 2007 Sony Computer Entertainment Inc.
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms,
|
|
with or without modification, are permitted provided that the
|
|
following conditions are met:
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
* 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.
|
|
* Neither the name of the Sony Computer Entertainment Inc nor the names
|
|
of its contributors may be used to endorse or promote products derived
|
|
from this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER OR CONTRIBUTORS 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.
|
|
*/
|
|
|
|
#ifndef ___SIMD_MATH_EXPM1F4_H___
|
|
#define ___SIMD_MATH_EXPM1F4_H___
|
|
|
|
#include <simdmath.h>
|
|
#include <altivec.h>
|
|
|
|
#include <simdmath/_vec_utils.h>
|
|
|
|
#define __EXPM1F_ln1by2 -0.6931471805599f
|
|
#define __EXPM1F_ln3by2 0.4054651081082f
|
|
|
|
static inline vector float
|
|
_expm1f4 (vector float x)
|
|
{
|
|
vector float zeros = __vec_splatsf4(0.0f);
|
|
vector unsigned int nearzeromask =
|
|
(vector unsigned int)vec_and(vec_cmpgt(x, __vec_splatsf4(__EXPM1F_ln1by2)),
|
|
vec_cmpgt(__vec_splatsf4(__EXPM1F_ln3by2), x));
|
|
vector float x2 = vec_madd(x,x,zeros);
|
|
vector float d0, d1, n0, n1;
|
|
|
|
d0 = vec_madd(x , __vec_splatsf4(-0.3203561199f), __vec_splatsf4(0.9483177697f));
|
|
d1 = vec_madd(x2, __vec_splatsf4( 0.0326527809f), d0);
|
|
|
|
n0 = vec_madd(x , __vec_splatsf4(0.1538026623f), __vec_splatsf4(0.9483177732f));
|
|
n1 = vec_madd(x , __vec_splatsf4(0.0024490478f), __vec_splatsf4(0.0305274668f));
|
|
n1 = vec_madd(x2, n1, n0);
|
|
|
|
return vec_sel(vec_sub(expf4(x), __vec_splatsf4(1.0f)),
|
|
vec_madd(x, divf4(n1, d1), zeros),
|
|
nearzeromask);
|
|
}
|
|
|
|
#endif
|