diff options
Diffstat (limited to 'newlib/libm/machine/spu/headers/floord2.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/floord2.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/floord2.h b/newlib/libm/machine/spu/headers/floord2.h new file mode 100644 index 000000000..baf5083ce --- /dev/null +++ b/newlib/libm/machine/spu/headers/floord2.h @@ -0,0 +1,122 @@ +/* -------------------------------------------------------------- */ +/* (C)Copyright 2006,2007, */ +/* 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. */ +/* 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 _FLOORD2_H_ +#define _FLOORD2_H_ 1 + +#include <spu_intrinsics.h> + + +/* + * FUNCTION + * vector double _floord2(vector double x) + * + * DESCRIPTION + * The _floord2 function rounds the elements of an vector double + * input vector downwards to their nearest integer representable + * as a double. + * + */ +static __inline vector double _floord2(vector double in) +{ + vec_uchar16 swap_words = (vec_uchar16) { 4,5,6,7, 0,1,2,3, 12,13,14,15, 8,9,10,11 }; + vec_uchar16 splat_hi = (vec_uchar16) { 0,1,2,3, 0,1,2,3, 8,9,10,11, 8,9,10,11 }; + vec_uint4 one = (vec_uint4) { 0, 1, 0, 1 }; + vec_int4 exp, shift; + vec_uint4 mask, mask_1, frac_mask, addend, insert, pos, equal0; + vec_ullong2 sign = spu_splats(0x8000000000000000ULL); + vec_double2 in_hi, out; + vec_double2 minus_one = spu_splats(-1.0); + + /* This function generates the following component + * based upon the inputs. + * + * mask = bits of the input that need to be replaced. + * insert = value of the bits that need to be replaced + * addend = value to be added to perform function. + * + * These are applied as follows:. + * + * out = ((in & mask) | insert) + addend + */ + in_hi = spu_shuffle(in, in, splat_hi); + pos = spu_cmpgt((vec_int4)in_hi, -1); + exp = spu_and(spu_rlmask((vec_int4)in_hi, -20), 0x7FF); + shift = spu_sub(((vec_int4) { 1023, 1043, 1023, 1043 } ), exp); + + /* clamp shift to the range 0 to -31. + */ + shift = spu_sel(spu_splats(-32), spu_andc(shift, (vec_int4)spu_cmpgt(shift, 0)), spu_cmpgt(shift, -32)); + + frac_mask = spu_rlmask(((vec_uint4) { 0xFFFFF, -1, 0xFFFFF, -1 } ), shift); + mask = spu_orc(frac_mask, spu_cmpgt(exp, 0x3FE)); + + /* addend = ((in & mask) && (in >= 0)) ? mask+1 : 0 + */ + mask_1 = spu_addx(mask, one, spu_rlqwbyte(spu_genc(mask, one), 4)); + + equal0 = spu_cmpeq(spu_and((vec_uint4)in, mask), 0); + addend = spu_andc(spu_andc(mask_1, pos), spu_and(equal0, spu_shuffle(equal0, equal0, swap_words))); + + insert = spu_andc(spu_andc((vec_uint4)minus_one, pos), + spu_cmpgt((vec_uint4)spu_add(exp, -1), 1022)); + + in = spu_sel(in, (vec_double2)insert, spu_andc((vec_ullong2)mask, sign)); + out = (vec_double2)spu_addx((vec_uint4)in, addend, spu_rlqwbyte(spu_genc((vec_uint4)in, addend), 4)); + + return (out); +} + +#endif /* _FLOORD2_H_ */ +#endif /* __SPU__ */ |