7529cdb3f6
The upcoming vectormath that will used to speed up the SPU version of Extras/BulletMultiThreaded depends on this.
59 lines
2.5 KiB
C
59 lines
2.5 KiB
C
/* ldexpf4 -
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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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vector float
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ldexpf4 (vector float x, vector signed int exp)
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{
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vec_int4 zeros = vec_splatsi4(0);
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vec_int4 expmask = vec_splatsi4(0x7F800000);
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vec_int4 e1 = vec_and((vec_int4)x, expmask);
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vec_int4 e2 = vec_sr(e1,vec_splatsu4(23));
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vec_uint4 maxmask = (vec_uint4)vec_cmpgt(exp, vec_splatsi4(255));
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vec_uint4 minmask = (vec_uint4)vec_cmpgt(vec_splatsi4(-255), exp);
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minmask = vec_or (minmask, (vec_uint4)vec_cmpeq(x, (vec_float4)zeros));
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vec_int4 esum = vec_add(e2, exp);
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maxmask = vec_or (maxmask, (vec_uint4)vec_cmpgt(esum, vec_splatsi4(255)));
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maxmask = vec_and(maxmask, vec_splatsu4(0x7FFFFFFF));
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minmask = vec_or (minmask, (vec_uint4)vec_cmpgt(zeros, esum));
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x = vec_sel(x, (vec_float4)vec_sl(esum,vec_splatsu4(23)), (vec_uint4)expmask);
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x = vec_sel(x, (vec_float4)zeros, minmask);
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x = vec_sel(x, (vec_float4)maxmask, maxmask);
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return x;
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}
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