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jeremybenn |
/*
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(C) Copyright 2001,2006,
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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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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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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 names of the copyright holders nor the names of their
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contributors may be used to endorse or promote products derived from this
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software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _FMAX_H_
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#define _FMAX_H_ 1
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#include <spu_intrinsics.h>
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#include "headers/vec_literal.h"
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/* Return the maximum numeric value of their arguments. If one argument
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* is a NaN, fmax returns the other value. If both are NaNs, then a NaN
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* is returned.
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*
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* Notes:
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* 1) Double precision denorms equate to zero so two denorms compare
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* equal thereby making the following true for two denorm inputs
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* fmax(a, b) != fmax(b, a);
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*/
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static __inline double _fmax(double x, double y)
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{
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vec_uint4 nan_x, selector, abs_x, gt, eq;
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vec_uint4 sign = VEC_LITERAL(vec_uint4, 0x80000000, 0, 0x80000000, 0);
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vec_uint4 infinity = VEC_LITERAL(vec_uint4, 0x7FF00000, 0, 0x7FF00000, 0);
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vec_double2 vx, vy, diff, max;
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vx = spu_promote(x, 0);
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vy = spu_promote(y, 0);
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/* If x is a NaN, then select y as max
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*/
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abs_x = spu_andc((vec_uint4)vx, sign);
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gt = spu_cmpgt(abs_x, infinity);
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eq = spu_cmpeq(abs_x, infinity);
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nan_x = spu_or(gt, spu_and(eq, spu_rlqwbyte(gt, 4)));
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diff = spu_sub(vx, vy);
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selector = spu_orc(nan_x, spu_cmpgt((vec_int4)diff, -1));
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selector = spu_maskw(spu_extract(selector, 0));
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max = spu_sel(vx, vy, (vec_ullong2)selector);
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return (spu_extract(max, 0));
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}
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#endif /* _FMAX_H_ */
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