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added updated version of simdmathlibrary-1.0.1

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ejcoumans
2007-07-27 18:53:58 +00:00
parent fddd6c5721
commit f360dd27d6
377 changed files with 9928 additions and 6136 deletions
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Extras/simdmathlibrary/ppu/simdmath/log2f4.h Normal file
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/* log2f4 -
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_LOG2F4_H___
#define ___SIMD_MATH_LOG2F4_H___
#include <simdmath.h>
#include <altivec.h>
#include <simdmath/divf4.h>
#define __LOG2F_l2emsb 1.4426950216293f
#define __LOG2F_l2elsb 1.9259629911e-8f
#define __LOG2F_negl2e -1.4426950408890f
#define __LOG2F_c0 -0.2988439998f
#define __LOG2F_c1 -0.3997655209f
#define __LOG2F_c2 -0.6666679125f
static inline vector float
_log2f4 (vector float x)
{
vector signed int zeros = __vec_splatsi4(0);
vector float ones = __vec_splatsf4(1.0f);
vector signed int expmask = __vec_splatsi4(0x7F800000);
vector signed int xexp =
vec_add( vec_sr(vec_and((vector signed int)x, expmask), __vec_splatsu4(23)), __vec_splatsi4(-126) );
x = vec_sel(x, (vector float)(__vec_splatsi4(0x3F000000)), (vector unsigned int)expmask);
vector unsigned int mask = (vector unsigned int)vec_cmpgt( __vec_splatsf4(0.7071067811865f), x);
x = vec_sel(x , vec_add(x, x) , mask);
xexp = vec_sel(xexp, vec_sub(xexp, __vec_splatsi4(1) ), mask);
vector float x1 = vec_sub(x , ones);
vector float z = _divf4(x1, vec_add(x, ones));
vector float w = vec_madd(z , z, (vector float)zeros);
vector float polywneg;
polywneg = vec_madd(__vec_splatsf4(__LOG2F_c0), w, __vec_splatsf4(__LOG2F_c1));
polywneg = vec_madd(polywneg , w, __vec_splatsf4(__LOG2F_c2));
vector float y = vec_madd(z, vec_madd(polywneg, w, x1), (vector float)zeros);
vector float zz1 = vec_madd(__vec_splatsf4(__LOG2F_l2emsb), x1, vec_ctf(xexp,0));
vector float zz2 = vec_madd(__vec_splatsf4(__LOG2F_l2elsb), x1,
vec_madd(__vec_splatsf4(__LOG2F_negl2e), y, (vector float)zeros));
return vec_add(zz1,zz2);
}
#endif