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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 _TRUNCD2_H_
#define _TRUNCD2_H_ 1
#include <spu_intrinsics.h>
/*
* FUNCTION
* vector double _truncd2(vector double x)
*
* DESCRIPTION
* The _truncd2 function truncates the elements of the input vector
* downwards (towards zero) to the nearest integer.
*
*/
static __inline vector double _truncd2(vector double in)
{
vec_uchar16 splat_hi = (vec_uchar16) { 0,1,2,3,0,1,2,3, 8,9,10,11, 8,9,10,11 };
vec_int4 exp, shift;
vec_uint4 sign = (vec_uint4) { 0x80000000, 0, 0x80000000, 0 };
vec_uint4 or_mask, and_mask, mask;
vec_double2 in_hi, out;
/* Construct a mask to remove the fraction bits. The mask
* depends on the exponent of the floating point
* input value.
*/
in_hi = spu_shuffle(in, in, splat_hi);
exp = spu_and(spu_rlmask((vec_int4)in_hi, -20), 0x7FF);
shift = spu_sub(((vec_int4) { 1023, 1043, 1023, 1043 }), exp);
or_mask = spu_andc(spu_cmpgt(shift, 0), sign);
and_mask = spu_rlmask(((vec_uint4) { 0xFFFFF, -1, 0xFFFFF, -1 }), shift);
mask = spu_or(spu_and(and_mask, spu_cmpgt(shift, -32)), or_mask);
/* Apply the mask and return the result.
*/
out = spu_andc(in, (vec_double2)(mask));
return (out);
}
#endif /* _TRUNCD2_H_ */
#endif /* __SPU__ */
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