7529cdb3f6
The upcoming vectormath that will used to speed up the SPU version of Extras/BulletMultiThreaded depends on this.
58 lines
2.5 KiB
C
58 lines
2.5 KiB
C
/* expm1f4 -
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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 _EXPM1F_H_ln1by2 ((float)-0.6931471805599f)
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#define _EXPM1F_H_ln3by2 ((float) 0.4054651081082f)
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vector float
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expm1f4 (vector float x)
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{
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vec_float4 zeros = vec_splatsf4(0.0f);
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vec_uint4 nearzeromask = (vec_uint4)vec_and(vec_cmpgt(x, vec_splatsf4(_EXPM1F_H_ln1by2)),
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vec_cmpgt(vec_splatsf4(_EXPM1F_H_ln3by2), x));
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vec_float4 x2 = vec_madd(x,x,zeros);
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vec_float4 d0, d1, n0, n1;
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d0 = vec_madd(x , vec_splatsf4(-0.3203561199f), vec_splatsf4(0.9483177697f));
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d1 = vec_madd(x2, vec_splatsf4( 0.0326527809f), d0);
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n0 = vec_madd(x , vec_splatsf4(0.1538026623f), vec_splatsf4(0.9483177732f));
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n1 = vec_madd(x , vec_splatsf4(0.0024490478f), vec_splatsf4(0.0305274668f));
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n1 = vec_madd(x2, n1, n0);
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return vec_sel(vec_sub(expf4(x), vec_splatsf4(1.0f)),
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vec_madd(x, divf4(n1, d1), zeros),
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nearzeromask);
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}
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