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/* -------------------------------------------------------------- */
/* (C)Copyright 2001,2008, */
/* International Business Machines Corporation, */
/* Sony Computer Entertainment, Incorporated, */
/* Toshiba Corporation, */
/* */
/* All Rights Reserved. */
/* */
/* Redistribution and use in source and binary forms, with or */
/* without modification, are permitted provided that the */
/* following conditions are met: */
/* */
/* - Redistributions of source code must retain the above copyright*/
/* notice, this list of conditions and the following disclaimer. */
/* */
/* - Redistributions in binary form must reproduce the above */
/* copyright notice, this list of conditions and the following */
/* disclaimer in the documentation and/or other materials */
/* provided with the distribution. */
/* */
/* - Neither the name of IBM Corporation nor the names of its */
/* contributors may be used to endorse or promote products */
/* derived from this software without specific prior written */
/* permission. */
/* */
/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND */
/* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, */
/* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */
/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */
/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR */
/* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT */
/* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */
/* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) */
/* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */
/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR */
/* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */
/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/* -------------------------------------------------------------- */
/* PROLOG END TAG zYx */
#ifdef __SPU__
#ifndef _LDEXPD2_H_
#define _LDEXPD2_H_ 1
#include <spu_intrinsics.h>
/*
* FUNCTION
* vector double _ldexpd2(vector double x, vector signed long long exp)
*
* DESCRIPTION
* The _ldexpd2 function Computes x * 2^exp for each of the two elements
* of x using the corresponding elements of exp.
*
*/
static __inline vector double _ldexpd2(vector double x, vector signed long long llexp)
{
vec_uchar16 odd_to_even = ((vec_uchar16) { 4,5,6,7, 0x80,0x80,0x80,0x80,
12,13,14,15, 0x80,0x80,0x80,0x80 });
vec_int4 exp;
vec_int4 e1, e2;
vec_int4 min = spu_splats(-2044);
vec_int4 max = spu_splats(2046);
vec_uint4 cmp_min, cmp_max;
vec_uint4 shift = (vec_uint4) { 20, 32, 20, 32 };
vec_double2 f1, f2;
vec_double2 out;
exp = (vec_int4)spu_shuffle(llexp, llexp, odd_to_even);
/* Clamp the specified exponent to the range -2044 to 2046.
*/
cmp_min = spu_cmpgt(exp, min);
cmp_max = spu_cmpgt(exp, max);
exp = spu_sel(min, exp, cmp_min);
exp = spu_sel(exp, max, cmp_max);
/* Generate the factors f1 = 2^e1 and f2 = 2^e2
*/
e1 = spu_rlmaska(exp, -1);
e2 = spu_sub(exp, e1);
f1 = (vec_double2)spu_sl(spu_add(e1, 1023), shift);
f2 = (vec_double2)spu_sl(spu_add(e2, 1023), shift);
/* Compute the product x * 2^e1 * 2^e2
*/
out = spu_mul(spu_mul(x, f1), f2);
return (out);
}
#endif /* _LDEXPD2_H_ */
#endif /* __SPU__ */
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