7529cdb3f6
The upcoming vectormath that will used to speed up the SPU version of Extras/BulletMultiThreaded depends on this.
75 lines
2.9 KiB
C
75 lines
2.9 KiB
C
/* exp2f4
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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 <math.h>
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#include "common-types.h"
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vector float
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powf4 (vector float x, vector float y)
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{
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vec_int4 zeros = (vec_int4){0,0,0,0};
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vec_uint4 zeromask = (vec_uint4)vec_cmpeq((vec_float4)zeros, x);
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vec_uint4 negmask = (vec_uint4)vec_cmpgt((vec_float4)zeros, x);
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vec_float4 sbit = (vec_float4)(vec_splatsi4(0x80000000));
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vec_float4 absx = vec_andc(x, sbit);
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vec_float4 absy = vec_andc(y, sbit);
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vec_uint4 oddy = vec_and(vec_ctu(absy, 0), vec_splatsu4(0x00000001));
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negmask = vec_and(negmask, (vec_uint4)vec_cmpgt(oddy, (vec_uint4)zeros));
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vec_float4 res = exp2f4(vec_madd(y, log2f4(absx), (vec_float4)zeros));
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res = vec_sel(res, vec_or(sbit, res), negmask);
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return vec_sel(res, (vec_float4)zeros, zeromask);
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}
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/*
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{
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vec_int4 zeros = vec_splats(0);
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vec_int4 ones = (vec_int4)vec_splats((char)0xFF);
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vec_uint4 zeromask = (vec_uint4)vec_cmpeq((vec_float4)zeros, x);
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vec_uint4 onemask = (vec_uint4)vec_cmpeq((vec_float4)ones , y);
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vec_uint4 negmask = (vec_uint4)vec_cmpgt(vec_splats(0.0f), x);
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vec_float4 sbit = (vec_float4)(vec_int4)(0x80000000);
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vec_float4 absx = vec_andc(x, sbit);
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vec_float4 absy = vec_andc(y, sbit);
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vec_uint4 oddy = vec_and(vec_convtu(absy, 0), (vec_uint4)vec_splats(0x00000001));
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negmask = vec_and(negmask, (vec_uint4)vec_cmpgt(oddy, (vec_uint4)zeros));
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}
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*/
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