mirror of
https://github.com/tildearrow/furnace.git
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322 lines
8.3 KiB
C
322 lines
8.3 KiB
C
/*
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* Copyright (c) 2003, 2007-14 Matteo Frigo
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* Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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/* express a hc2hc problem in terms of rdft + multiplication by
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twiddle factors */
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#include "rdft/hc2hc.h"
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typedef hc2hc_solver S;
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typedef struct {
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plan_hc2hc super;
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INT r, m, s, vl, vs, mstart1, mcount1;
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plan *cld0;
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plan *cld;
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twid *td;
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} P;
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/**************************************************************/
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static void mktwiddle(P *ego, enum wakefulness wakefulness)
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{
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static const tw_instr tw[] = { { TW_HALF, 0, 0 }, { TW_NEXT, 1, 0 } };
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/* note that R and M are swapped, to allow for sequential
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access both to data and twiddles */
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X(twiddle_awake)(wakefulness, &ego->td, tw,
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ego->r * ego->m, ego->m, ego->r);
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}
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static void bytwiddle(const P *ego, R *IO, R sign)
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{
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INT i, j, k;
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INT r = ego->r, m = ego->m, s = ego->s, vl = ego->vl, vs = ego->vs;
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INT ms = m * s;
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INT mstart1 = ego->mstart1, mcount1 = ego->mcount1;
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INT wrem = 2 * ((m-1)/2 - mcount1);
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for (i = 0; i < vl; ++i, IO += vs) {
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const R *W = ego->td->W;
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A(m % 2 == 1);
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for (k = 1, W += (m - 1) + 2*(mstart1-1); k < r; ++k) {
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/* pr := IO + (j + mstart1) * s + k * ms */
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R *pr = IO + mstart1 * s + k * ms;
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/* pi := IO + (m - j - mstart1) * s + k * ms */
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R *pi = IO - mstart1 * s + (k + 1) * ms;
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for (j = 0; j < mcount1; ++j, pr += s, pi -= s) {
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E xr = *pr;
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E xi = *pi;
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E wr = W[0];
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E wi = sign * W[1];
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*pr = xr * wr - xi * wi;
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*pi = xi * wr + xr * wi;
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W += 2;
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}
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W += wrem;
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}
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}
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}
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static void swapri(R *IO, INT r, INT m, INT s, INT jstart, INT jend)
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{
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INT k;
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INT ms = m * s;
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INT js = jstart * s;
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for (k = 0; k + k < r; ++k) {
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/* pr := IO + (m - j) * s + k * ms */
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R *pr = IO + (k + 1) * ms - js;
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/* pi := IO + (m - j) * s + (r - 1 - k) * ms */
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R *pi = IO + (r - k) * ms - js;
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INT j;
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for (j = jstart; j < jend; j += 1, pr -= s, pi -= s) {
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R t = *pr;
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*pr = *pi;
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*pi = t;
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}
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}
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}
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static void reorder_dit(const P *ego, R *IO)
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{
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INT i, k;
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INT r = ego->r, m = ego->m, s = ego->s, vl = ego->vl, vs = ego->vs;
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INT ms = m * s;
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INT mstart1 = ego->mstart1, mend1 = mstart1 + ego->mcount1;
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for (i = 0; i < vl; ++i, IO += vs) {
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for (k = 1; k + k < r; ++k) {
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R *p0 = IO + k * ms;
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R *p1 = IO + (r - k) * ms;
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INT j;
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for (j = mstart1; j < mend1; ++j) {
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E rp, ip, im, rm;
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rp = p0[j * s];
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im = p1[ms - j * s];
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rm = p1[j * s];
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ip = p0[ms - j * s];
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p0[j * s] = rp - im;
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p1[ms - j * s] = rp + im;
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p1[j * s] = rm - ip;
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p0[ms - j * s] = ip + rm;
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}
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}
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swapri(IO, r, m, s, mstart1, mend1);
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}
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}
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static void reorder_dif(const P *ego, R *IO)
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{
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INT i, k;
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INT r = ego->r, m = ego->m, s = ego->s, vl = ego->vl, vs = ego->vs;
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INT ms = m * s;
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INT mstart1 = ego->mstart1, mend1 = mstart1 + ego->mcount1;
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for (i = 0; i < vl; ++i, IO += vs) {
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swapri(IO, r, m, s, mstart1, mend1);
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for (k = 1; k + k < r; ++k) {
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R *p0 = IO + k * ms;
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R *p1 = IO + (r - k) * ms;
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const R half = K(0.5);
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INT j;
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for (j = mstart1; j < mend1; ++j) {
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E rp, ip, im, rm;
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rp = half * p0[j * s];
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im = half * p1[ms - j * s];
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rm = half * p1[j * s];
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ip = half * p0[ms - j * s];
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p0[j * s] = rp + im;
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p1[ms - j * s] = im - rp;
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p1[j * s] = rm + ip;
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p0[ms - j * s] = ip - rm;
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}
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}
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}
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}
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static int applicable(rdft_kind kind, INT r, INT m, const planner *plnr)
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{
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return (1
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&& (kind == R2HC || kind == HC2R)
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&& (m % 2)
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&& (r % 2)
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&& !NO_SLOWP(plnr)
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);
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}
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/**************************************************************/
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static void apply_dit(const plan *ego_, R *IO)
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{
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const P *ego = (const P *) ego_;
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INT start;
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plan_rdft *cld, *cld0;
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bytwiddle(ego, IO, K(-1.0));
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cld0 = (plan_rdft *) ego->cld0;
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cld0->apply(ego->cld0, IO, IO);
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start = ego->mstart1 * ego->s;
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cld = (plan_rdft *) ego->cld;
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cld->apply(ego->cld, IO + start, IO + start);
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reorder_dit(ego, IO);
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}
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static void apply_dif(const plan *ego_, R *IO)
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{
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const P *ego = (const P *) ego_;
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INT start;
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plan_rdft *cld, *cld0;
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reorder_dif(ego, IO);
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cld0 = (plan_rdft *) ego->cld0;
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cld0->apply(ego->cld0, IO, IO);
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start = ego->mstart1 * ego->s;
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cld = (plan_rdft *) ego->cld;
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cld->apply(ego->cld, IO + start, IO + start);
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bytwiddle(ego, IO, K(1.0));
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}
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static void awake(plan *ego_, enum wakefulness wakefulness)
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{
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P *ego = (P *) ego_;
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X(plan_awake)(ego->cld0, wakefulness);
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X(plan_awake)(ego->cld, wakefulness);
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mktwiddle(ego, wakefulness);
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}
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static void destroy(plan *ego_)
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{
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P *ego = (P *) ego_;
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X(plan_destroy_internal)(ego->cld);
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X(plan_destroy_internal)(ego->cld0);
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}
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static void print(const plan *ego_, printer *p)
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{
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const P *ego = (const P *) ego_;
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p->print(p, "(hc2hc-generic-%s-%D-%D%v%(%p%)%(%p%))",
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ego->super.apply == apply_dit ? "dit" : "dif",
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ego->r, ego->m, ego->vl, ego->cld0, ego->cld);
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}
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static plan *mkcldw(const hc2hc_solver *ego_,
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rdft_kind kind, INT r, INT m, INT s, INT vl, INT vs,
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INT mstart, INT mcount,
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R *IO, planner *plnr)
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{
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P *pln;
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plan *cld0 = 0, *cld = 0;
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INT mstart1, mcount1, mstride;
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static const plan_adt padt = {
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0, awake, print, destroy
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};
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UNUSED(ego_);
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A(mstart >= 0 && mcount > 0 && mstart + mcount <= (m+2)/2);
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if (!applicable(kind, r, m, plnr))
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return (plan *)0;
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A(m % 2);
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mstart1 = mstart + (mstart == 0);
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mcount1 = mcount - (mstart == 0);
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mstride = m - (mstart + mcount - 1) - mstart1;
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/* 0th (DC) transform (vl of these), if mstart == 0 */
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cld0 = X(mkplan_d)(plnr,
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X(mkproblem_rdft_1_d)(
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mstart == 0 ? X(mktensor_1d)(r, m * s, m * s)
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: X(mktensor_0d)(),
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X(mktensor_1d)(vl, vs, vs),
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IO, IO, kind)
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);
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if (!cld0) goto nada;
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/* twiddle transforms: there are 2 x mcount1 x vl of these
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(where 2 corresponds to the real and imaginary parts) ...
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the 2 x mcount1 loops are combined if mstart=0 and mcount=(m+2)/2. */
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cld = X(mkplan_d)(plnr,
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X(mkproblem_rdft_1_d)(
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X(mktensor_1d)(r, m * s, m * s),
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X(mktensor_3d)(2, mstride * s, mstride * s,
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mcount1, s, s,
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vl, vs, vs),
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IO + s * mstart1, IO + s * mstart1, kind)
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);
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if (!cld) goto nada;
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pln = MKPLAN_HC2HC(P, &padt, (kind == R2HC) ? apply_dit : apply_dif);
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pln->cld = cld;
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pln->cld0 = cld0;
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pln->r = r;
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pln->m = m;
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pln->s = s;
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pln->vl = vl;
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pln->vs = vs;
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pln->td = 0;
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pln->mstart1 = mstart1;
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pln->mcount1 = mcount1;
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{
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double n0 = 0.5 * (r - 1) * (2 * mcount1) * vl;
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pln->super.super.ops = cld->ops;
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pln->super.super.ops.mul += (kind == R2HC ? 5.0 : 7.0) * n0;
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pln->super.super.ops.add += 4.0 * n0;
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pln->super.super.ops.other += 11.0 * n0;
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}
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return &(pln->super.super);
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nada:
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X(plan_destroy_internal)(cld);
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X(plan_destroy_internal)(cld0);
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return (plan *) 0;
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}
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static void regsolver(planner *plnr, INT r)
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{
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S *slv = (S *)X(mksolver_hc2hc)(sizeof(S), r, mkcldw);
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REGISTER_SOLVER(plnr, &(slv->super));
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if (X(mksolver_hc2hc_hook)) {
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slv = (S *)X(mksolver_hc2hc_hook)(sizeof(S), r, mkcldw);
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REGISTER_SOLVER(plnr, &(slv->super));
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}
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}
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void X(hc2hc_generic_register)(planner *p)
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{
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regsolver(p, 0);
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}
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