7529cdb3f6
The upcoming vectormath that will used to speed up the SPU version of Extras/BulletMultiThreaded depends on this.
74 lines
3.2 KiB
C
74 lines
3.2 KiB
C
/* logf4 -
|
|
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.
|
|
*/
|
|
|
|
#include <simdmath.h>
|
|
#include <altivec.h>
|
|
|
|
#include "common-types.h"
|
|
|
|
|
|
#define _LOGF_H_ln2msb ((float)(0.6931470632553f))
|
|
#define _LOGF_H_negln2lsb ((float)(-1.1730463525e-7f))
|
|
|
|
#define _LOGF_H_c0 ((float)(-0.2988439998f))
|
|
#define _LOGF_H_c1 ((float)(-0.3997655209f))
|
|
#define _LOGF_H_c2 ((float)(-0.6666679125f))
|
|
|
|
vector float
|
|
logf4 (vector float x)
|
|
{
|
|
vec_int4 zeros = vec_splatsi4(0);
|
|
vec_float4 ones = vec_splatsf4(1.0f);
|
|
//vec_uchar16 zeromask = (vec_uchar16)vec_cmpeq(x, (vec_float4)zeros);
|
|
|
|
vec_int4 expmask = vec_splatsi4(0x7F800000);
|
|
vec_int4 xexp = vec_add( vec_sr(vec_and((vec_int4)x, expmask), vec_splatsu4(23)), vec_splatsi4(-126) );
|
|
x = vec_sel(x, (vec_float4)(vec_splatsi4(0x3F000000)), (vec_uint4)expmask);
|
|
|
|
|
|
vec_uint4 mask = (vec_uint4)vec_cmpgt(vec_splatsf4((float)0.7071067811865f), x);
|
|
x = vec_sel(x , vec_add(x, x) , mask);
|
|
xexp = vec_sel(xexp, vec_sub(xexp,vec_splatsi4(1)), mask);
|
|
|
|
vec_float4 x1 = vec_sub(x , ones);
|
|
vec_float4 z = divf4 (x1, vec_add(x, ones));
|
|
vec_float4 w = vec_madd(z , z, (vec_float4)zeros);
|
|
vec_float4 polywneg;
|
|
polywneg = vec_madd(vec_splatsf4(_LOGF_H_c0), w, vec_splatsf4(_LOGF_H_c1));
|
|
polywneg = vec_madd(polywneg , w, vec_splatsf4(_LOGF_H_c2));
|
|
|
|
vec_float4 y = vec_madd(z, vec_madd(polywneg, w, x1), (vec_float4)zeros);
|
|
vec_float4 wnew = vec_ctf(xexp,0);
|
|
vec_float4 zz1 = vec_madd(vec_splatsf4(_LOGF_H_ln2msb) , wnew, x1);
|
|
vec_float4 zz2neg = vec_madd(vec_splatsf4(_LOGF_H_negln2lsb), wnew, y );
|
|
|
|
//return vec_sel(vec_sub(zz1,zz2neg), (vec_float4)zeromask, zeromask);
|
|
return vec_sub(zz1,zz2neg);
|
|
}
|