73 lines
2.6 KiB
C
73 lines
2.6 KiB
C
|
/*
|
||
|
|
(C) Copyright 2001,2006,
|
||
|
|
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 names of the copyright holders nor the names of their
|
||
|
|
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.
|
||
|
|
*/
|
||
|
|
#ifndef _ROUNDF_H_
|
||
|
|
#define _ROUNDF_H_ 1
|
||
|
|
|
||
|
|
#include <spu_intrinsics.h>
|
||
|
|
#include "headers/vec_literal.h"
|
||
|
|
|
||
|
|
/* Round the input to the nearest integer, rounding halfway
|
||
|
|
* cases away from zero.
|
||
|
|
*/
|
||
|
|
static __inline float _roundf(float x)
|
||
|
|
{
|
||
|
|
vec_int4 exp;
|
||
|
|
vec_uint4 or_mask, and_mask, mask, addend;
|
||
|
|
vec_float4 in, out;
|
||
|
|
|
||
|
|
in = spu_promote(x, 0);
|
||
|
|
|
||
|
|
/* Add 0.5 (fixed precision to eliminate rounding issues)
|
||
|
|
*/
|
||
|
|
exp = spu_sub(125, spu_and(spu_rlmask((vec_int4)in, -23), 0xFF));
|
||
|
|
|
||
|
|
addend = spu_and(spu_rlmask(VEC_SPLAT_U32(0x1000000), exp),
|
||
|
|
spu_cmpgt((vec_uint4)exp, -31));
|
||
|
|
|
||
|
|
in = (vec_float4)spu_add((vec_uint4)in, addend);
|
||
|
|
|
||
|
|
/* Truncate the result.
|
||
|
|
*/
|
||
|
|
exp = spu_sub(127, spu_and(spu_rlmask((vec_int4)in, -23), 0xFF));
|
||
|
|
|
||
|
|
or_mask = spu_cmpgt(exp, 0);
|
||
|
|
and_mask = spu_rlmask(VEC_SPLAT_U32(0x7FFFFF), exp);
|
||
|
|
|
||
|
|
mask = spu_or(spu_and(and_mask, spu_cmpgt(exp, -31)), or_mask);
|
||
|
|
|
||
|
|
out = spu_andc(in, (vec_float4)(mask));
|
||
|
|
|
||
|
|
return (spu_extract(out, 0));
|
||
|
|
}
|
||
|
|
#endif /* _ROUNDF_H_ */
|