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Diffstat (limited to 'newlib/libm/machine/spu/headers/floor.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/floor.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/floor.h b/newlib/libm/machine/spu/headers/floor.h new file mode 100644 index 000000000..6675b948d --- /dev/null +++ b/newlib/libm/machine/spu/headers/floor.h @@ -0,0 +1,94 @@ +/* + (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 _FLOOR_H_ +#define _FLOOR_H_ 1 + +#include <spu_intrinsics.h> +#include "headers/vec_literal.h" + +/* Round the input downwards to the nearest integer. + */ +static __inline double _floor(double x) +{ + vec_uchar16 swap_words = VEC_LITERAL(vec_uchar16, 4,5,6,7, 0,1,2,3, 12,13,14,15, 8,9,10,11); + vec_uchar16 splat_hi = VEC_LITERAL(vec_uchar16, 0,1,2,3,0,1,2,3, 8,9,10,11, 8,9,10,11); + vec_uint4 one = VEC_LITERAL(vec_uint4, 0, 1, 0, 1); + vec_int4 exp, shift; + vec_uint4 mask, mask_1, frac_mask, addend, insert, pos, equal0; + vec_ullong2 sign = VEC_SPLAT_U64(0x8000000000000000ULL); + vec_double2 in, in_hi, out; + vec_double2 minus_one = VEC_SPLAT_F64(-1.0); + + in = spu_promote(x, 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_LITERAL(vec_int4, 1023, 1043, 1023, 1043), exp); + + /* clamp shift to the range 0 to -31. + */ + shift = spu_sel(VEC_SPLAT_S32(-32), spu_andc(shift, (vec_int4)spu_cmpgt(shift, 0)), spu_cmpgt(shift, -32)); + + frac_mask = spu_rlmask(VEC_LITERAL(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 (spu_extract(out, 0)); +} +#endif /* _FLOOR_H_ */ |