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141 lines
4.5 KiB
C
141 lines
4.5 KiB
C
/*
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* This file is part of libpsht.
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*
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* libpsht 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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* libpsht 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 libpsht; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* libpsht is being developed at the Max-Planck-Institut fuer Astrophysik
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* and financially supported by the Deutsches Zentrum fuer Luft- und Raumfahrt
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* (DLR).
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*/
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/*! \file ylmgen_c.h
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* Code for efficient calculation of Y_lm(phi=0,theta)
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*
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* Copyright (C) 2005-2011 Max-Planck-Society
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* \author Martin Reinecke
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*/
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#ifndef PLANCK_YLMGEN_C_H
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#define PLANCK_YLMGEN_C_H
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#include "sse_utils.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef double ylmgen_dbl2[2];
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typedef double ylmgen_dbl3[3];
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typedef struct
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{
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double cth_crit;
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int mdist_crit;
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/* members depending on m and m' */
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int s, m, mlo, mhi, cosPow, sinPow;
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long double prefactor;
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ylmgen_dbl3 *fx;
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int preMinus_p, preMinus_m;
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} sylmgen_d;
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typedef struct
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{
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double fsmall, fbig, eps, cth_crit;
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int lmax, mmax, m_cur, ith, nth, m_crit, spinrec;
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/*! The index of the first non-negligible Y_lm value. */
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int *firstl;
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double *cf, *mfac, *t1fac, *t2fac, *th, *cth, *sth, *logsth;
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ylmgen_dbl2 *recfac;
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double *lamfact;
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/*! Points to an array of size [0..lmax] containing the Y_lm values. */
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double *ylm;
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/*! Points to an array of size [0..lmax] containing the lambda_w
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and lambda_x values for spin>0 transforms. */
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ylmgen_dbl2 **lambda_wx;
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long double *logsum, *lc05, *ls05;
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double *flm1, *flm2, *xl;
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sylmgen_d **sylm;
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int *lwx_uptodate;
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int ylm_uptodate;
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#ifdef PLANCK_HAVE_SSE2
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int ith1, ith2;
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/*! Points to an array of size [0..lmax] containing the Y_lm values. */
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v2df *ylm_sse2;
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/*! Points to an array of size [0..lmax] containing the lambda_w
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and lambda_x values for spin>0 transforms. */
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v2df2 **lambda_wx_sse2;
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int *lwx_uptodate_sse2;
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int ylm_uptodate_sse2;
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#endif
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int recfac_uptodate, lamfact_uptodate;
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} Ylmgen_C;
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/*! Creates a generator which will calculate Y_lm(theta,phi=0)
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up to \a l=l_max and \a m=m_max. It may regard Y_lm whose absolute
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magnitude is smaller than \a epsilon as zero. If \a spinrec is nonzero,
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the spin-1 and spin-2 Y_lm will be calculated by recursion from the spin-0
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ones, otherwise Wigner d matrix elements will be used. */
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void Ylmgen_init (Ylmgen_C *gen, int l_max, int m_max, int spinrec,
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double epsilon);
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/*! Passes am array \a theta of \a nth colatitudes that will be used in
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subsequent calls. The individual angles will be referenced by their
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index in the array, starting with 0.
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\note The array can be freed or reused after the call. */
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void Ylmgen_set_theta (Ylmgen_C *gen, const double *theta, int nth);
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/*! Deallocates a generator previously initialised by Ylmgen_init(). */
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void Ylmgen_destroy (Ylmgen_C *gen);
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/*! Prepares the object for the calculation at \a theta and \a m. */
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void Ylmgen_prepare (Ylmgen_C *gen, int ith, int m);
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/*! Recalculates (if necessary) the Y_lm values. */
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void Ylmgen_recalc_Ylm (Ylmgen_C *gen);
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/*! Recalculates (if necessary) the lambda_w and lambda_x values for spin >0
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transforms. */
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void Ylmgen_recalc_lambda_wx (Ylmgen_C *gen, int spin);
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#ifdef PLANCK_HAVE_SSE2
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/*! Prepares the object for the calculation at \a theta, \a theta2 and \a m. */
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void Ylmgen_prepare_sse2 (Ylmgen_C *gen, int ith1, int ith2, int m);
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/*! Recalculates (if necessary) the Y_lm values. */
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void Ylmgen_recalc_Ylm_sse2 (Ylmgen_C *gen);
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/*! Recalculates (if necessary) the lambda_w and lambda_x values for spin >0
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transforms. */
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void Ylmgen_recalc_lambda_wx_sse2 (Ylmgen_C *gen, int spin);
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#endif
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/*! Returns a pointer to an array with lmax+1 entries containing normalisation
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factors that must be applied to Y_lm values computed for \a spin with the
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given \a spinrec flag. The array must be deallocated (using free()) by the
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user. */
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double *Ylmgen_get_norm (int lmax, int spin, int spinrec);
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/*! Returns the maximum spin quantum number supported by the Ylmgen code. */
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int Ylmgen_maxspin(void);
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#ifdef __cplusplus
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}
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#endif
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#endif
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