diff options
Diffstat (limited to 'residual_calc_template.c')
-rw-r--r-- | residual_calc_template.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/residual_calc_template.c b/residual_calc_template.c new file mode 100644 index 0000000..779ac24 --- /dev/null +++ b/residual_calc_template.c @@ -0,0 +1,105 @@ +/* + * Residual calculation template + * Copyright 2019 Anton Khirnov <anton@khirnov.net> + * + * 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 3 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, see <http://www.gnu.org/licenses/>. + */ + +#if ADD +# define ACT add +#else +#define ACT calc +#endif + +#define JOIN3(a, b, c) a ## _ ## b ## _ ## c +#define FUNC3(name, act, stencil) JOIN3(name, act, stencil) +#define FUNC(name) FUNC3(name, ACT, STENCIL) + +static void +FUNC(derivatives_calc)(double *dst, const double *u, ptrdiff_t stride) +{ + dst[MG2D_DIFF_COEFF_00] = u[0]; + + { + double val = 0.0; + for (int i = -STENCIL; i <= STENCIL; i++) + val += fd_coeffs[STENCIL - 1][0][i + STENCIL] * u[i]; + dst[MG2D_DIFF_COEFF_10] = val; + } + { + double val = 0.0; + for (int i = -STENCIL; i <= STENCIL; i++) + val += fd_coeffs[STENCIL - 1][0][i + STENCIL] * u[i * stride]; + dst[MG2D_DIFF_COEFF_01] = val; + } + { + double val = 0.0; + for (int i = -STENCIL; i <= STENCIL; i++) + val += fd_coeffs[STENCIL - 1][1][i + STENCIL] * u[i]; + dst[MG2D_DIFF_COEFF_20] = val; + } + { + double val = 0.0; + for (int i = -STENCIL; i <= STENCIL; i++) + val += fd_coeffs[STENCIL - 1][1][i + STENCIL] * u[i * stride]; + dst[MG2D_DIFF_COEFF_02] = val; + } + { + double val = 0.0; + for (int j = -STENCIL; j <= STENCIL; j++) { + double tmp = 0.0; + for (int i = -STENCIL; i <= STENCIL; i++) + tmp += fd_coeffs[STENCIL - 1][0][i + STENCIL] * u[j * stride + i]; + val += fd_coeffs[STENCIL - 1][0][j + STENCIL] * tmp; + } + dst[MG2D_DIFF_COEFF_11] = val; + } +} +static void +FUNC(residual_line)(size_t linesize, double *dst, double *dst_max, + ptrdiff_t stride, const double *u, const double *rhs, + const double * const diff_coeffs[MG2D_DIFF_COEFF_NB], + double res_mult +#if ADD + , double u_mult +#endif + ) +{ + double res_max = 0.0, res_abs; + for (size_t i = 0; i < linesize; i++) { + double u_vals[MG2D_DIFF_COEFF_NB]; + double res; + + FUNC(derivatives_calc)(u_vals, u + i, stride); + + res = -rhs[i]; + for (int j = 0; j < ARRAY_ELEMS(u_vals); j++) + res += u_vals[j] * diff_coeffs[j][i]; + dst[i] = res_mult * res +#if ADD + + u_mult * u[i] +#endif + ; + + res_abs = fabs(res); + res_max = MAX(res_max, res_abs); + } + + *dst_max = MAX(*dst_max, res_max); +} + +#undef FUNC +#undef FUNC2 +#undef JOIN2 +#undef ACT |