| 1 |
148 |
jeremybenn |
/* -------------------------------------------------------------- */
|
| 2 |
|
|
/* (C)Copyright 2001,2008, */
|
| 3 |
|
|
/* International Business Machines Corporation, */
|
| 4 |
|
|
/* Sony Computer Entertainment, Incorporated, */
|
| 5 |
|
|
/* Toshiba Corporation, */
|
| 6 |
|
|
/* */
|
| 7 |
|
|
/* All Rights Reserved. */
|
| 8 |
|
|
/* */
|
| 9 |
|
|
/* Redistribution and use in source and binary forms, with or */
|
| 10 |
|
|
/* without modification, are permitted provided that the */
|
| 11 |
|
|
/* following conditions are met: */
|
| 12 |
|
|
/* */
|
| 13 |
|
|
/* - Redistributions of source code must retain the above copyright*/
|
| 14 |
|
|
/* notice, this list of conditions and the following disclaimer. */
|
| 15 |
|
|
/* */
|
| 16 |
|
|
/* - Redistributions in binary form must reproduce the above */
|
| 17 |
|
|
/* copyright notice, this list of conditions and the following */
|
| 18 |
|
|
/* disclaimer in the documentation and/or other materials */
|
| 19 |
|
|
/* provided with the distribution. */
|
| 20 |
|
|
/* */
|
| 21 |
|
|
/* - Neither the name of IBM Corporation nor the names of its */
|
| 22 |
|
|
/* contributors may be used to endorse or promote products */
|
| 23 |
|
|
/* derived from this software without specific prior written */
|
| 24 |
|
|
/* permission. */
|
| 25 |
|
|
/* */
|
| 26 |
|
|
/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND */
|
| 27 |
|
|
/* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, */
|
| 28 |
|
|
/* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */
|
| 29 |
|
|
/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */
|
| 30 |
|
|
/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR */
|
| 31 |
|
|
/* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
|
| 32 |
|
|
/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT */
|
| 33 |
|
|
/* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */
|
| 34 |
|
|
/* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) */
|
| 35 |
|
|
/* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */
|
| 36 |
|
|
/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR */
|
| 37 |
|
|
/* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */
|
| 38 |
|
|
/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
|
| 39 |
|
|
/* -------------------------------------------------------------- */
|
| 40 |
|
|
/* PROLOG END TAG zYx */
|
| 41 |
|
|
#ifdef __SPU__
|
| 42 |
|
|
#ifndef _TRUNCF4_H_
|
| 43 |
|
|
#define _TRUNCF4_H_ 1
|
| 44 |
|
|
|
| 45 |
|
|
#include <spu_intrinsics.h>
|
| 46 |
|
|
|
| 47 |
|
|
/*
|
| 48 |
|
|
* FUNCTION
|
| 49 |
|
|
* vector float _truncf4(vector float x)
|
| 50 |
|
|
*
|
| 51 |
|
|
* DESCRIPTION
|
| 52 |
|
|
* The _truncf4 function truncates the elements of the input vector
|
| 53 |
|
|
* downwards (towards zero) to the nearest integer.
|
| 54 |
|
|
*
|
| 55 |
|
|
*/
|
| 56 |
|
|
static __inline vector float _truncf4(vector float x)
|
| 57 |
|
|
{
|
| 58 |
|
|
vec_int4 exp;
|
| 59 |
|
|
vec_uint4 or_mask, and_mask, mask;
|
| 60 |
|
|
vec_float4 out;
|
| 61 |
|
|
|
| 62 |
|
|
// Construct a mask to remove the fraction bits. The mask
|
| 63 |
|
|
// depends on the exponent of the floating point
|
| 64 |
|
|
// input value.
|
| 65 |
|
|
exp = spu_sub(127, spu_and(spu_rlmask((vec_int4) x, -23), 0xFF));
|
| 66 |
|
|
|
| 67 |
|
|
// Be sure to always preserve the sign bit
|
| 68 |
|
|
or_mask = spu_rlmask(spu_cmpgt(exp, 0),-1);
|
| 69 |
|
|
|
| 70 |
|
|
and_mask = spu_rlmask(spu_splats((unsigned int)0x7FFFFF), exp);
|
| 71 |
|
|
mask = spu_or(spu_and(and_mask, spu_cmpgt(exp, -31)), or_mask);
|
| 72 |
|
|
|
| 73 |
|
|
// Apply the mask and return the result.
|
| 74 |
|
|
|
| 75 |
|
|
out = spu_andc(x, (vec_float4) (mask));
|
| 76 |
|
|
return (out);
|
| 77 |
|
|
}
|
| 78 |
|
|
#endif /* _TRUNCF4_H_ */
|
| 79 |
|
|
#endif /* __SPU__ */
|
