7529cdb3f6
The upcoming vectormath that will used to speed up the SPU version of Extras/BulletMultiThreaded depends on this.
83 lines
3.6 KiB
C
83 lines
3.6 KiB
C
/* log10f4 -
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Copyright (C) 2006, 2007 Sony Computer Entertainment Inc.
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All rights reserved.
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Redistribution and use in source and binary forms,
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with or without modification, are permitted provided that the
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following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the Sony Computer Entertainment Inc nor the names
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of its contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <simdmath.h>
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#include <altivec.h>
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#include "common-types.h"
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#define _LOG10F_H_loga2msb ((float) 0.3010299205780f)
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#define _LOG10F_H_loga2lsb ((float) 7.5085978266e-8f)
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#define _LOG10F_H_logaemsb ((float) 0.4342944622040f)
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#define _LOG10F_H_logaelsb ((float) 1.9699272335e-8f)
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#define _LOG10F_H_neglogae ((float)-0.4342944819033f)
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#define _LOG10F_H_c0 ((float)(-0.2988439998f))
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#define _LOG10F_H_c1 ((float)(-0.3997655209f))
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#define _LOG10F_H_c2 ((float)(-0.6666679125f))
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vector float
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log10f4 (vector float x)
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{
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vec_int4 zeros = vec_splatsi4(0);
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vec_float4 ones = vec_splatsf4(1.0f);
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//vec_uchar16 zeromask = (vec_uchar16)vec_cmpeq(x, (vec_float4)zeros);
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vec_int4 expmask = vec_splatsi4(0x7F800000);
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vec_int4 xexp = vec_add( vec_sr(vec_and((vec_int4)x, expmask), vec_splatsu4(23)), vec_splatsi4(-126) );
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x = vec_sel(x, (vec_float4)(vec_splatsi4(0x3F000000)), (vec_uint4)expmask);
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vec_uint4 mask = (vec_uint4)vec_cmpgt( vec_splatsf4((float)0.7071067811865f), x);
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x = vec_sel(x , vec_add(x, x) , mask);
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xexp = vec_sel(xexp, vec_sub(xexp, vec_splatsi4(1)), mask);
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vec_float4 x1 = vec_sub(x , ones);
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vec_float4 z = divf4 (x1, vec_add(x, ones));
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vec_float4 w = vec_madd(z , z, (vec_float4)zeros);
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vec_float4 polywneg;
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polywneg = vec_madd(vec_splatsf4(_LOG10F_H_c0), w, vec_splatsf4(_LOG10F_H_c1));
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polywneg = vec_madd(polywneg , w, vec_splatsf4(_LOG10F_H_c2));
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vec_float4 y = vec_madd(z, vec_madd(polywneg, w, x1), (vec_float4)zeros);
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vec_float4 wnew = vec_ctf(xexp,0);
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vec_float4 zz1 = vec_madd(vec_splatsf4(_LOG10F_H_logaemsb), x1,
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vec_madd(vec_splatsf4(_LOG10F_H_loga2msb),wnew,(vec_float4)zeros));
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vec_float4 zz2 = vec_madd(vec_splatsf4(_LOG10F_H_logaelsb), x1,
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vec_madd(vec_splatsf4(_LOG10F_H_loga2lsb), wnew,
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vec_madd(vec_splatsf4(_LOG10F_H_neglogae),y,(vec_float4)zeros))
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);
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//return vec_sel(vec_add(zz1,zz2), (vec_float4)zeromask, zeromask);
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return vec_add(zz1, zz2);
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}
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