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167 lines
5.9 KiB
C
167 lines
5.9 KiB
C
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/*
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(C) Copyright 2001,2006,
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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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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the names of the copyright holders nor the names of their
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contributors may be used to endorse or promote products derived from this
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software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _FMOD_H_
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#define _FMOD_H_ 1
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#include <spu_intrinsics.h>
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#include <errno.h>
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#include "headers/vec_literal.h"
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/* This implementation returns zero if y is a denorm or zero.
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*/
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static __inline double _fmod(double x, double y)
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{
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int n, shift;
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vec_uchar16 swap_words = VEC_LITERAL(vec_uchar16, 4,5,6,7, 0,1,2,3, 12,13,14,15, 8,9,10,11);
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vec_uchar16 propagate = VEC_LITERAL(vec_uchar16, 4,5,6,7, 192,192,192,192, 12,13,14,15, 192,192,192,192);
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vec_uchar16 splat_hi = VEC_LITERAL(vec_uchar16, 0,1,2,3,0,1,2,3, 8,9,10,11, 8,9,10,11);
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vec_uint4 vx, vy, z;
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vec_uint4 x_hi, y_hi;
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vec_uint4 abs_x, abs_y;
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vec_uint4 exp_x, exp_y;
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vec_uint4 zero_x, zero_y;
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vec_uint4 logb_x, logb_y;
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vec_uint4 mant_x, mant_y;
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vec_uint4 normal, norm, denorm;
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vec_uint4 result, result0, resultx, cnt, sign, borrow;
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vec_uint4 lsb = (vec_uint4)(VEC_SPLAT_U64(0x0000000000000001ULL));
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vec_uint4 sign_mask = (vec_uint4)(VEC_SPLAT_U64(0x8000000000000000ULL));
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vec_uint4 implied_1 = (vec_uint4)(VEC_SPLAT_U64(0x0010000000000000ULL));
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vec_uint4 mant_mask = (vec_uint4)(VEC_SPLAT_U64(0x000FFFFFFFFFFFFFULL));
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vec_ullong2 domain;
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vec_int4 verrno;
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vec_double2 vc = { 0.0, 0.0 };
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vec_int4 fail = { EDOM, EDOM, EDOM, EDOM };
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vx = (vec_uint4)spu_promote(x, 0);
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vy = (vec_uint4)spu_promote(y, 0);
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abs_x = spu_andc(vx, sign_mask);
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abs_y = spu_andc(vy, sign_mask);
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sign = spu_and(vx, sign_mask);
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x_hi = spu_shuffle(abs_x, abs_x, splat_hi);
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y_hi = spu_shuffle(abs_y, abs_y, splat_hi);
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/* Determine ilogb of abs_x and abs_y and
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* extract the mantissas (mant_x, mant_y)
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*/
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exp_x = spu_rlmask(x_hi, -20);
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exp_y = spu_rlmask(y_hi, -20);
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resultx = spu_cmpgt(y_hi, x_hi);
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zero_x = spu_cmpeq(exp_x, 0);
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zero_y = spu_cmpeq(exp_y, 0);
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logb_x = spu_add(exp_x, -1023);
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logb_y = spu_add(exp_y, -1023);
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mant_x = spu_andc(spu_sel(implied_1, abs_x, mant_mask), zero_x);
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mant_y = spu_andc(spu_sel(implied_1, abs_y, mant_mask), zero_y);
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/* Compute fixed point fmod of mant_x and mant_y. Set the flag,
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* result0, to all ones if we detect that the final result is
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* ever 0.
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*/
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result0 = spu_or(zero_x, zero_y);
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n = spu_extract(spu_sub(logb_x, logb_y), 0);
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while (n-- > 0) {
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borrow = spu_genb(mant_x, mant_y);
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borrow = spu_shuffle(borrow, borrow, propagate);
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z = spu_subx(mant_x, mant_y, borrow);
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result0 = spu_or(spu_cmpeq(spu_or(z, spu_shuffle(z, z, swap_words)), 0), result0);
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mant_x = spu_sel(spu_slqw(mant_x, 1), spu_andc(spu_slqw(z, 1), lsb),
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spu_cmpgt((vec_int4)spu_shuffle(z, z, splat_hi), -1));
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}
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borrow = spu_genb(mant_x, mant_y);
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borrow = spu_shuffle(borrow, borrow, propagate);
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z = spu_subx(mant_x, mant_y, borrow);
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mant_x = spu_sel(mant_x, z,
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spu_cmpgt((vec_int4)spu_shuffle(z, z, splat_hi), -1));
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mant_x = spu_andc(mant_x, VEC_LITERAL(vec_uint4, 0,0,-1,-1));
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result0 = spu_or(spu_cmpeq(spu_or(mant_x, spu_shuffle(mant_x, mant_x, swap_words)), 0), result0);
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/* Convert the result back to floating point and restore
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* the sign. If we flagged the result to be zero (result0),
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* zero it. If we flagged the result to equal its input x,
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* (resultx) then return x.
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*
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* Double precision generates a denorm for an output.
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*/
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cnt = spu_cntlz(mant_x);
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cnt = spu_add(cnt, spu_and(spu_rlqwbyte(cnt, 4), spu_cmpeq(cnt, 32)));
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cnt = spu_add(spu_shuffle(cnt, cnt, splat_hi), -11);
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shift = spu_extract(exp_y, 0) - 1;
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denorm = spu_slqwbytebc(spu_slqw(mant_x, shift), shift);
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exp_y = spu_sub(exp_y, cnt);
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normal = spu_cmpgt((vec_int4)exp_y, 0);
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/* Normalize normal results, denormalize denorm results.
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*/
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shift = spu_extract(cnt, 0);
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norm = spu_slqwbytebc(spu_slqw(spu_andc(mant_x, VEC_LITERAL(vec_uint4, 0x00100000, 0, -1, -1)), shift), shift);
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mant_x = spu_sel(denorm, norm, normal);
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exp_y = spu_and(spu_rl(exp_y, 20), normal);
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result = spu_sel(exp_y, spu_or(sign, mant_x), VEC_LITERAL(vec_uint4, 0x800FFFFF, -1, 0x800FFFFF, -1));
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result = spu_sel(spu_andc(result, spu_rlmask(result0, -1)), vx,
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resultx);
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#ifndef _IEEE_LIBM
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/*
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* If y is zero, set errno to EDOM
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*/
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domain = spu_cmpeq(vc, (vec_double2) vy);
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verrno = spu_splats(errno);
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errno = spu_extract(spu_sel(verrno, fail, (vector unsigned int) domain), 0);
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#endif
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return (spu_extract((vec_double2)result, 0));
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}
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#endif /* _FMOD_H_ */
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