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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 _LDEXPD2_H_
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#define _LDEXPD2_H_ 1
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#include <spu_intrinsics.h>
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/*
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* FUNCTION
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* vector double _ldexpd2(vector double x, vector signed long long exp)
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*
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* DESCRIPTION
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* The _ldexpd2 function Computes x * 2^exp for each of the two elements
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* of x using the corresponding elements of exp.
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*
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*/
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static __inline vector double _ldexpd2(vector double x, vector signed long long llexp)
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{
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vec_uchar16 odd_to_even = ((vec_uchar16) { 4,5,6,7, 0x80,0x80,0x80,0x80,
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12,13,14,15, 0x80,0x80,0x80,0x80 });
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vec_int4 exp;
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vec_int4 e1, e2;
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vec_int4 min = spu_splats(-2044);
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vec_int4 max = spu_splats(2046);
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vec_uint4 cmp_min, cmp_max;
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vec_uint4 shift = (vec_uint4) { 20, 32, 20, 32 };
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vec_double2 f1, f2;
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vec_double2 out;
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exp = (vec_int4)spu_shuffle(llexp, llexp, odd_to_even);
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/* Clamp the specified exponent to the range -2044 to 2046.
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*/
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cmp_min = spu_cmpgt(exp, min);
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cmp_max = spu_cmpgt(exp, max);
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exp = spu_sel(min, exp, cmp_min);
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exp = spu_sel(exp, max, cmp_max);
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/* Generate the factors f1 = 2^e1 and f2 = 2^e2
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*/
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e1 = spu_rlmaska(exp, -1);
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e2 = spu_sub(exp, e1);
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f1 = (vec_double2)spu_sl(spu_add(e1, 1023), shift);
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f2 = (vec_double2)spu_sl(spu_add(e2, 1023), shift);
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/* Compute the product x * 2^e1 * 2^e2
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*/
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out = spu_mul(spu_mul(x, f1), f2);
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return (out);
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}
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#endif /* _LDEXPD2_H_ */
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#endif /* __SPU__ */
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