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https://github.com/autc04/Retro68.git
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111 lines
5.0 KiB
C
111 lines
5.0 KiB
C
/* -------------------------------------------------------------- */
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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 _FLOORD2_H_
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#define _FLOORD2_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 _floord2(vector double x)
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*
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* DESCRIPTION
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* The _floord2 function rounds the elements of an vector double
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* input vector downwards to their nearest integer representable
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* as a double.
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*
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*/
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static __inline vector double _floord2(vector double in)
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{
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vec_uchar16 swap_words = (vec_uchar16) { 4,5,6,7, 0,1,2,3, 12,13,14,15, 8,9,10,11 };
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vec_uchar16 splat_hi = (vec_uchar16) { 0,1,2,3, 0,1,2,3, 8,9,10,11, 8,9,10,11 };
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vec_uint4 one = (vec_uint4) { 0, 1, 0, 1 };
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vec_int4 exp, shift;
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vec_uint4 mask, mask_1, frac_mask, addend, insert, pos, equal0;
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vec_ullong2 sign = spu_splats(0x8000000000000000ULL);
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vec_double2 in_hi, out;
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vec_double2 minus_one = spu_splats(-1.0);
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/* This function generates the following component
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* based upon the inputs.
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*
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* mask = bits of the input that need to be replaced.
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* insert = value of the bits that need to be replaced
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* addend = value to be added to perform function.
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*
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* These are applied as follows:.
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*
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* out = ((in & mask) | insert) + addend
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*/
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in_hi = spu_shuffle(in, in, splat_hi);
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pos = spu_cmpgt((vec_int4)in_hi, -1);
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exp = spu_and(spu_rlmask((vec_int4)in_hi, -20), 0x7FF);
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shift = spu_sub(((vec_int4) { 1023, 1043, 1023, 1043 } ), exp);
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/* clamp shift to the range 0 to -31.
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*/
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shift = spu_sel(spu_splats(-32), spu_andc(shift, (vec_int4)spu_cmpgt(shift, 0)), spu_cmpgt(shift, -32));
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frac_mask = spu_rlmask(((vec_uint4) { 0xFFFFF, -1, 0xFFFFF, -1 } ), shift);
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mask = spu_orc(frac_mask, spu_cmpgt(exp, 0x3FE));
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/* addend = ((in & mask) && (in >= 0)) ? mask+1 : 0
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*/
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mask_1 = spu_addx(mask, one, spu_rlqwbyte(spu_genc(mask, one), 4));
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equal0 = spu_cmpeq(spu_and((vec_uint4)in, mask), 0);
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addend = spu_andc(spu_andc(mask_1, pos), spu_and(equal0, spu_shuffle(equal0, equal0, swap_words)));
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insert = spu_andc(spu_andc((vec_uint4)minus_one, pos),
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spu_cmpgt((vec_uint4)spu_add(exp, -1), 1022));
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in = spu_sel(in, (vec_double2)insert, spu_andc((vec_ullong2)mask, sign));
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out = (vec_double2)spu_addx((vec_uint4)in, addend, spu_rlqwbyte(spu_genc((vec_uint4)in, addend), 4));
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return (out);
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}
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#endif /* _FLOORD2_H_ */
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#endif /* __SPU__ */
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