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Diffstat (limited to 'newlib/libm/machine/spu/headers/round.h')
-rw-r--r-- | newlib/libm/machine/spu/headers/round.h | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/round.h b/newlib/libm/machine/spu/headers/round.h new file mode 100644 index 000000000..0943218b6 --- /dev/null +++ b/newlib/libm/machine/spu/headers/round.h @@ -0,0 +1,85 @@ +/* + (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 _ROUND_H_ +#define _ROUND_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 double _round(double x) +{ + 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_int4 exp, shift; + vec_uint4 sign = VEC_LITERAL(vec_uint4, 0x80000000, 0, 0x80000000, 0); + vec_uint4 or_mask, and_mask, mask, addend; + vec_double2 in, in_hi, out; + + in = spu_promote(x, 0); + + /* Add 0.5 (fixed precision to eliminate rounding issues) + */ + in_hi = spu_shuffle(in, in, splat_hi); + exp = spu_and(spu_rlmask((vec_int4)in_hi, -20), 0x7FF); + + shift = spu_sub(VEC_LITERAL(vec_int4, 1022, 1043, 1022, 1043), exp); + + addend = spu_and(spu_rlmask(VEC_LITERAL(vec_uint4, 0x100000, 0x80000000, + 0x100000, 0x80000000), shift), + spu_cmpgt((vec_uint4)spu_add(shift, -1), -33)); + + in = (vec_double2)spu_addx((vec_uint4)in, addend, + spu_rlqwbyte(spu_genc((vec_uint4)in, addend), 4)); + + /* Truncate the result. + */ + in_hi = spu_shuffle(in, in, splat_hi); + exp = spu_and(spu_rlmask((vec_int4)in_hi, -20), 0x7FF); + + shift = spu_sub(VEC_LITERAL(vec_int4, 1023, 1043, 1023, 1043), exp); + or_mask = spu_andc(spu_cmpgt(shift, 0), sign); + + + and_mask = spu_rlmask(VEC_LITERAL(vec_uint4, 0xFFFFF, -1, 0xFFFFF, -1), + shift); + mask = spu_or(spu_and(and_mask, spu_cmpgt(shift, -31)), or_mask); + + /* Apply the mask and return the result. + */ + out = spu_andc(in, (vec_double2)(mask)); + + return (spu_extract(out, 0)); +} +#endif /* _ROUND_H_ */ |