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Diffstat (limited to 'src/fftw3/rdft/rank0-rdft2.c')
| -rw-r--r-- | src/fftw3/rdft/rank0-rdft2.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/src/fftw3/rdft/rank0-rdft2.c b/src/fftw3/rdft/rank0-rdft2.c new file mode 100644 index 0000000..5a2a649 --- /dev/null +++ b/src/fftw3/rdft/rank0-rdft2.c @@ -0,0 +1,195 @@ +/* + * Copyright (c) 2003 Matteo Frigo + * Copyright (c) 2003 Massachusetts Institute of Technology + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +/* $Id: rank0-rdft2.c,v 1.1 2008/10/17 06:11:29 scuri Exp $ */ + +/* plans for rank-0 RDFT2 (copy operations, plus setting 0 imag. parts) */ + +#include "rdft.h" + +#ifdef HAVE_STRING_H +#include <string.h> /* for memcpy() */ +#endif + +typedef struct { + solver super; +} S; + +typedef struct { + plan_rdft super; + int vl; + int ivs, ovs; + plan *cldcpy; +} P; + +static int applicable(const problem *p_) +{ + if (RDFT2P(p_)) { + const problem_rdft2 *p = (const problem_rdft2 *) p_; + return (1 + && p->sz->rnk == 0 + && (p->kind == HC2R + || (((p->r != p->rio && p->r != p->iio) + || X(rdft2_inplace_strides)(p, RNK_MINFTY)) + && p->vecsz->rnk <= 1)) + ); + } + return 0; +} + +static void apply_r2hc(const plan *ego_, R *r, R *rio, R *iio) +{ + const P *ego = (const P *) ego_; + int i, vl = ego->vl; + int ivs = ego->ivs, ovs = ego->ovs; + + for (i = 4; i <= vl; i += 4) { + R r0, r1, r2, r3; + r0 = *r; r += ivs; + r1 = *r; r += ivs; + r2 = *r; r += ivs; + r3 = *r; r += ivs; + *rio = r0; rio += ovs; + *iio = 0.0; iio += ovs; + *rio = r1; rio += ovs; + *iio = 0.0; iio += ovs; + *rio = r2; rio += ovs; + *iio = 0.0; iio += ovs; + *rio = r3; rio += ovs; + *iio = 0.0; iio += ovs; + } + for (; i < vl + 4; ++i) { + R r0; + r0 = *r; r += ivs; + *rio = r0; rio += ovs; + *iio = 0.0; iio += ovs; + } +} + +/* in-place r2hc rank-0: set imaginary parts of output to 0 */ +static void apply_r2hc_inplace(const plan *ego_, R *r, R *rio, R *iio) +{ + const P *ego = (const P *) ego_; + int i, vl = ego->vl; + int ovs = ego->ovs; + + UNUSED(r); + UNUSED(rio); + for (i = 4; i <= vl; i += 4) { + *iio = 0.0; iio += ovs; + *iio = 0.0; iio += ovs; + *iio = 0.0; iio += ovs; + *iio = 0.0; iio += ovs; + } + for (; i < vl + 4; ++i) { + *iio = 0.0; iio += ovs; + } +} + +/* a rank-0 HC2R rdft2 problem is just a copy from rio to r, + so we can use a rank-0 rdft plan */ +static void apply_hc2r(const plan *ego_, R *r, R *rio, R *iio) +{ + const P *ego = (const P *) ego_; + plan_rdft *cldcpy = (plan_rdft *) ego->cldcpy; + UNUSED(iio); + cldcpy->apply((plan *) cldcpy, rio, r); +} + +static void awake(plan *ego_, int flg) +{ + P *ego = (P *) ego_; + if (ego->cldcpy) + AWAKE(ego->cldcpy, flg); +} + +static void destroy(plan *ego_) +{ + P *ego = (P *) ego_; + if (ego->cldcpy) + X(plan_destroy_internal)(ego->cldcpy); +} + +static void print(const plan *ego_, printer *p) +{ + const P *ego = (const P *) ego_; + if (ego->cldcpy) + p->print(p, "(rdft2-hc2r-rank0%(%p%))", ego->cldcpy); + else + p->print(p, "(rdft2-r2hc-rank0%v)", ego->vl); +} + +static plan *mkplan(const solver *ego_, const problem *p_, planner *plnr) +{ + const problem_rdft2 *p; + plan *cldcpy = (plan *) 0; + P *pln; + + static const plan_adt padt = { + X(rdft2_solve), awake, print, destroy + }; + + UNUSED(ego_); + + if (!applicable(p_)) + return (plan *) 0; + + p = (const problem_rdft2 *) p_; + + if (p->kind == HC2R) { + cldcpy = X(mkplan_d)(plnr, + X(mkproblem_rdft_d)( + X(mktensor_0d)(), + X(tensor_copy)(p->vecsz), + p->rio, p->r, (rdft_kind *) 0)); + if (!cldcpy) return (plan *) 0; + } + + pln = MKPLAN_RDFT2(P, &padt, + p->kind == R2HC ? + (p->r == p->rio ? apply_r2hc_inplace : apply_r2hc) + : apply_hc2r); + + if (p->kind == R2HC) + X(tensor_tornk1)(p->vecsz, &pln->vl, &pln->ivs, &pln->ovs); + pln->cldcpy = cldcpy; + + if (p->kind == R2HC) { + /* vl loads, 2*vl stores */ + X(ops_other)(3 * pln->vl, &pln->super.super.ops); + } + else { + pln->super.super.ops = cldcpy->ops; + } + + return &(pln->super.super); +} + +static solver *mksolver(void) +{ + static const solver_adt sadt = { mkplan }; + S *slv = MKSOLVER(S, &sadt); + return &(slv->super); +} + +void X(rdft2_rank0_register)(planner *p) +{ + REGISTER_SOLVER(p, mksolver()); +} |