1 // Copyright (c) 2017-2026, Lawrence Livermore National Security, LLC and other CEED contributors.
2 // All Rights Reserved. See the top-level LICENSE and NOTICE files for details.
3 //
4 // SPDX-License-Identifier: BSD-2-Clause
5 //
6 // This file is part of CEED: http://github.com/ceed
7
8 /**
9 @brief Ceed QFunction for applying the 1D Poisson operator
10 **/
11 #include <ceed/types.h>
12
Poisson1DApply(void * ctx,const CeedInt Q,const CeedScalar * const * in,CeedScalar * const * out)13 CEED_QFUNCTION(Poisson1DApply)(void *ctx, const CeedInt Q, const CeedScalar *const *in, CeedScalar *const *out) {
14 // in[0] is gradient u, size (Q)
15 // in[1] is quadrature data, size (Q)
16 const CeedScalar *ug = in[0], *q_data = in[1];
17
18 // out[0] is output to multiply against gradient v, size (Q)
19 CeedScalar *vg = out[0];
20
21 // Quadrature point loop
22 CeedPragmaSIMD for (CeedInt i = 0; i < Q; i++) { vg[i] = ug[i] * q_data[i]; } // End of Quadrature Point Loop
23 return CEED_ERROR_SUCCESS;
24 }
25