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jeremybenn |
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/* (C)Copyright 2001,2008, */
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/* International Business Machines Corporation, */
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/* Sony Computer Entertainment, Incorporated, */
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/* Toshiba Corporation, */
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/* */
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/* All Rights Reserved. */
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/* */
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/* Redistribution and use in source and binary forms, with or */
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/* without modification, are permitted provided that the */
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/* following conditions are met: */
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/* */
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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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/* */
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/* - Redistributions in binary form must reproduce the above */
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/* copyright notice, this list of conditions and the following */
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/* disclaimer in the documentation and/or other materials */
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/* provided with the distribution. */
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/* */
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/* - Neither the name of IBM Corporation nor the names of its */
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/* contributors may be used to endorse or promote products */
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/* derived from this software without specific prior written */
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/* permission. */
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/* */
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/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND */
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/* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, */
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/* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */
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/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */
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/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR */
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/* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
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/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT */
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/* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */
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/* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) */
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/* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */
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/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR */
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/* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */
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/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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/* -------------------------------------------------------------- */
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/* PROLOG END TAG zYx */
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#ifdef __SPU__
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#ifndef _FLOORF4_H_
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#define _FLOORF4_H_ 1
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#include <spu_intrinsics.h>
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/*
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* FUNCTION
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* vector float _floorf4(vector float value)
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*
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* DESCRIPTION
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* The _floorf4 routine rounds a vector of input values "value" downwards
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* to their nearest integer returning the result as a vector of floats.
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*
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* The full range form (default) provides floor computation on
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* all IEEE floating point values. The floor of NANs remain NANs.
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* The floor of denorms results in zero.
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*
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*/
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static __inline vector float _floorf4(vector float value)
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{
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/* FULL FLOATING-POINT RANGE
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*/
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vec_int4 exp, shift;
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vec_uint4 mask, frac_mask, addend, insert, pos;
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vec_float4 out;
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/* This function generates the following component
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* based upon the inputs.
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*
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* mask = bits of the input that need to be replaced.
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* insert = value of the bits that need to be replaced
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* addend = value to be added to perform function.
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*
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* These are applied as follows:.
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*
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* out = ((in & mask) | insert) + addend
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*/
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pos = spu_cmpgt((vec_int4)value, -1);
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exp = spu_and(spu_rlmask((vec_int4)value, -23), 0xFF);
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shift = spu_sub(127, exp);
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frac_mask = spu_and(spu_rlmask(spu_splats((unsigned int)0x7FFFFF), shift),
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spu_cmpgt((vec_int4)shift, -31));
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mask = spu_orc(frac_mask, spu_cmpgt(exp, 126));
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addend = spu_andc(spu_andc(spu_add(mask, 1), pos), spu_cmpeq(spu_and((vec_uint4)value, mask), 0));
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insert = spu_andc(spu_andc(spu_splats((unsigned int)0xBF800000), pos),
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spu_cmpgt((vec_uint4)spu_add(exp, -1), 126));
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out = (vec_float4)spu_add(spu_sel((vec_uint4)value, insert, mask), addend);
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/* Preserve orignal sign bit (for -0 case)
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*/
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out = spu_sel(out, value, spu_splats((unsigned int)0x80000000));
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return (out);
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}
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#endif /* _FLOORF4_H_ */
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#endif /* __SPU__ */
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