| 1 | /*BHEADER**********************************************************************
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| 2 | * Copyright (c) 2008, Lawrence Livermore National Security, LLC.
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| 3 | * Produced at the Lawrence Livermore National Laboratory.
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| 4 | * This file is part of HYPRE. See file COPYRIGHT for details.
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| 5 | *
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| 6 | * HYPRE is free software; you can redistribute it and/or modify it under the
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| 7 | * terms of the GNU Lesser General Public License (as published by the Free
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| 8 | * Software Foundation) version 2.1 dated February 1999.
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| 9 | *
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| 10 | * $Revision: 2.4 $
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| 11 | ***********************************************************************EHEADER*/
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| 12 |
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| 13 |
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| 14 | /******************************************************************************
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| 15 | *
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| 16 | * Structured axpy routine
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| 17 | *
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| 18 | *****************************************************************************/
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| 19 |
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| 20 | #include "headers.h"
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| 21 |
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| 22 | /*--------------------------------------------------------------------------
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| 23 | * hypre_StructAxpy
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| 24 | *--------------------------------------------------------------------------*/
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| 25 |
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| 26 | int
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| 27 | hypre_StructAxpy( double alpha,
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| 28 | hypre_StructVector *x,
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| 29 | hypre_StructVector *y )
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| 30 | {
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| 31 | int ierr = 0;
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| 32 |
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| 33 | hypre_Box *x_data_box;
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| 34 | hypre_Box *y_data_box;
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| 35 |
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| 36 | int xi;
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| 37 | int yi;
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| 38 |
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| 39 | double *xp;
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| 40 | double *yp;
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| 41 |
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| 42 | hypre_BoxArray *boxes;
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| 43 | hypre_Box *box;
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| 44 | hypre_Index loop_size;
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| 45 | hypre_IndexRef start;
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| 46 | hypre_Index unit_stride;
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| 47 |
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| 48 | int i;
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| 49 | int loopi, loopj, loopk;
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| 50 |
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| 51 | hypre_SetIndex(unit_stride, 1, 1, 1);
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| 52 |
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| 53 | boxes = hypre_StructGridBoxes(hypre_StructVectorGrid(y));
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| 54 | hypre_ForBoxI(i, boxes)
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| 55 | {
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| 56 | box = hypre_BoxArrayBox(boxes, i);
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| 57 | start = hypre_BoxIMin(box);
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| 58 |
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| 59 | x_data_box = hypre_BoxArrayBox(hypre_StructVectorDataSpace(x), i);
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| 60 | y_data_box = hypre_BoxArrayBox(hypre_StructVectorDataSpace(y), i);
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| 61 |
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| 62 | xp = hypre_StructVectorBoxData(x, i);
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| 63 | yp = hypre_StructVectorBoxData(y, i);
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| 64 |
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| 65 | hypre_BoxGetSize(box, loop_size);
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| 66 |
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| 67 | hypre_BoxLoop2Begin(loop_size,
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| 68 | x_data_box, start, unit_stride, xi,
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| 69 | y_data_box, start, unit_stride, yi);
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| 70 |
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| 71 | hypre_BoxLoop2For(loopi, loopj, loopk, xi, yi)
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| 72 | {
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| 73 | yp[yi] += alpha * xp[xi];
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| 74 | }
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| 75 | hypre_BoxLoop2End(xi, yi);
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| 76 | }
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| 77 |
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| 78 | return ierr;
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| 79 | }
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