source: palm/trunk/SOURCE/cuda_fft_interfaces.f90 @ 1818

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1!> @file cuda_fft_interfaces.f90
2!--------------------------------------------------------------------------------!
3! This file is part of PALM.
4!
5! PALM is free software: you can redistribute it and/or modify it under the terms
6! of the GNU General Public License as published by the Free Software Foundation,
7! either version 3 of the License, or (at your option) any later version.
8!
9! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
10! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11! A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
12!
13! You should have received a copy of the GNU General Public License along with
14! PALM. If not, see <http://www.gnu.org/licenses/>.
15!
16! Copyright 1997-2016 Leibniz Universitaet Hannover
17!--------------------------------------------------------------------------------!
18!
19! Current revisions:
20! -----------------
21!
22!
23! Former revisions:
24! -----------------
25! $Id: cuda_fft_interfaces.f90 1818 2016-04-06 15:53:27Z maronga $
26!
27! 1682 2015-10-07 23:56:08Z knoop
28! Code annotations made doxygen readable
29!
30! 1374 2014-04-25 12:55:07Z raasch
31! bugfix: missing module kinds added
32!
33! 1320 2014-03-20 08:40:49Z raasch
34! Kind-parameters added to all INTEGER and REAL declaration statements,
35! kinds are defined in new module kinds,
36! old module precision_kind is removed,
37! revision history before 2012 removed,
38! comment fields (!:) to be used for variable explanations added to
39! all variable declaration statements
40!
41! 1224 2013-09-16 07:27:23Z raasch
42! dummy interface added to avoid compiler warnings
43!
44! 1166 2013-05-24 13:55:44Z raasch
45! C_DOUBLE/COMPLEX reset to dpk,
46! DEVICE attribut added to idata/odata arguments
47!
48! 1153 2013-05-10 14:33:08Z raasch
49! code adjustment of data types for CUDA fft required by PGI 12.3 / CUDA 5.0
50!
51! 1111 2013-03-08 23:54:10Z raasch
52! idata and odata changed from 1d- to 3d-arrays
53!
54! 1106 2013-03-04 05:31:38Z raasch
55! Initial revision
56!
57! Description:
58! ------------
59!> FORTRAN interfaces for the CUDA fft
60!> Routines for the fft along x and y (forward/backward) using the CUDA fft
61!--------------------------------------------------------------------------------!
62 MODULE cuda_fft_interfaces
63 
64
65#if defined ( __cuda_fft )
66
67    USE kinds
68
69    INTEGER(iwp) ::  CUFFT_FORWARD = -1   !<
70    INTEGER(iwp) ::  CUFFT_INVERSE =  1   !<
71    INTEGER(iwp) ::  CUFFT_R2C = Z'2a'    !< Real to Complex (interleaved)
72    INTEGER(iwp) ::  CUFFT_C2R = Z'2c'    !< Complex (interleaved) to Real
73    INTEGER(iwp) ::  CUFFT_C2C = Z'29'    !< Complex to Complex, interleaved
74    INTEGER(iwp) ::  CUFFT_D2Z = Z'6a'    !< Double to Double-Complex
75    INTEGER(iwp) ::  CUFFT_Z2D = Z'6c'    !< Double-Complex to Double
76    INTEGER(iwp) ::  CUFFT_Z2Z = Z'69'    !< Double-Complex to Double-Complex
77
78    PUBLIC
79
80
81!
82!-- cufftPlan1d( cufftHandle *plan, int nx, cufftType type, int batch )
83    INTERFACE CUFFTPLAN1D
84
85!------------------------------------------------------------------------------!
86! Description:
87! ------------
88!> @todo Missing subroutine description.
89!------------------------------------------------------------------------------!
90       SUBROUTINE CUFFTPLAN1D( plan, nx, type, batch ) bind( C, name='cufftPlan1d' )
91
92          USE ISO_C_BINDING
93
94          INTEGER(C_INT)        ::  plan   !<
95          INTEGER(C_INT), value ::  batch  !<
96          INTEGER(C_INT), value ::  nx     !<
97          INTEGER(C_INT), value ::  type   !<
98       END SUBROUTINE CUFFTPLAN1D
99
100    END INTERFACE CUFFTPLAN1D
101
102!
103!-- cufftDestroy( cufftHandle plan )  !!! remove later if not really needed !!!
104    INTERFACE CUFFTDESTROY
105
106!------------------------------------------------------------------------------!
107! Description:
108! ------------
109!> @todo Missing subroutine description.
110!------------------------------------------------------------------------------!
111       SUBROUTINE CUFFTDESTROY( plan ) bind( C, name='cufftDestroy' )
112
113          USE ISO_C_BINDING
114
115          INTEGER(C_INT), VALUE ::  plan
116
117       END SUBROUTINE CUFFTDESTROY
118
119    END INTERFACE CUFFTDESTROY
120
121
122    INTERFACE CUFFTEXECZ2D
123
124!------------------------------------------------------------------------------!
125! Description:
126! ------------
127!> @todo Missing subroutine description.
128!------------------------------------------------------------------------------!
129       SUBROUTINE CUFFTEXECZ2D( plan, idata, odata ) bind( C, name='cufftExecZ2D' )
130
131          USE ISO_C_BINDING
132          USE kinds
133
134          INTEGER(C_INT), VALUE ::  plan          !<
135          COMPLEX(dp), DEVICE   ::  idata(:,:,:)  !<
136          REAL(dp), DEVICE      ::  odata(:,:,:)  !<
137
138       END SUBROUTINE CUFFTEXECZ2D
139
140    END INTERFACE CUFFTEXECZ2D
141
142
143    INTERFACE CUFFTEXECD2Z
144
145!------------------------------------------------------------------------------!
146! Description:
147! ------------
148!> @todo Missing subroutine description.
149!------------------------------------------------------------------------------!
150       SUBROUTINE CUFFTEXECD2Z( plan, idata, odata ) bind( C, name='cufftExecD2Z' )
151
152          USE ISO_C_BINDING
153         
154          USE kinds
155
156          INTEGER(C_INT), VALUE ::  plan          !<
157          REAL(dp), DEVICE      ::  idata(:,:,:)  !<
158          COMPLEX(dp), DEVICE   ::  odata(:,:,:)  !<
159
160       END SUBROUTINE CUFFTEXECD2Z
161
162    END INTERFACE CUFFTEXECD2Z
163
164#else
165
166    INTERFACE CUFFTdummy
167
168!------------------------------------------------------------------------------!
169! Description:
170! ------------
171!> Dummy interface to avoid compiler warnings in case of no bublic objects
172!> declared.
173!------------------------------------------------------------------------------!
174       SUBROUTINE CUFFTdummy( dummy )
175       
176          USE kinds
177
178          REAL(wp) ::  dummy  !<
179
180       END SUBROUTINE CUFFTdummy
181
182    END INTERFACE CUFFTdummy
183
184#endif
185
186 END MODULE cuda_fft_interfaces
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