1 | MODULE fft_xy |
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2 | |
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3 | !------------------------------------------------------------------------------! |
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4 | ! Current revisions: |
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5 | ! ----------------- |
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6 | ! |
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7 | ! |
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8 | ! Former revisions: |
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9 | ! ----------------- |
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10 | ! $Id: fft_xy.f90 392 2009-09-24 10:39:14Z hoffmann $ |
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11 | ! |
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12 | ! 274 2009-03-26 15:11:21Z heinze |
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13 | ! Output of messages replaced by message handling routine. |
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14 | ! |
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15 | ! Feb. 2007 |
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16 | ! RCS Log replace by Id keyword, revision history cleaned up |
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17 | ! |
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18 | ! Revision 1.4 2006/03/28 12:27:09 raasch |
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19 | ! Stop when system-specific fft is selected on NEC. For unknown reasons this |
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20 | ! causes a program abort during first allocation in init_grid. |
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21 | ! |
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22 | ! Revision 1.2 2004/04/30 11:44:27 raasch |
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23 | ! Module renamed from fft_for_1d_decomp to fft_xy, 1d-routines renamed to |
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24 | ! fft_x and fft_y, |
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25 | ! function FFT replaced by subroutine FFTN due to problems with 64-bit |
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26 | ! mode on ibm, |
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27 | ! shape of array cwork is explicitly stored in ishape/jshape and handled |
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28 | ! to routine FFTN instead of shape-function (due to compiler error on |
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29 | ! decalpha), |
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30 | ! non vectorized FFT for nec included |
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31 | ! |
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32 | ! Revision 1.1 2002/06/11 13:00:49 raasch |
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33 | ! Initial revision |
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34 | ! |
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35 | ! |
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36 | ! Description: |
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37 | ! ------------ |
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38 | ! Fast Fourier transformation along x and y for 1d domain decomposition along x. |
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39 | ! Original version: Klaus Ketelsen (May 2002) |
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40 | !------------------------------------------------------------------------------! |
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41 | |
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42 | USE array_kind |
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43 | USE control_parameters |
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44 | USE indices |
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45 | USE singleton |
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46 | USE temperton_fft |
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47 | |
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48 | IMPLICIT NONE |
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49 | |
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50 | PRIVATE |
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51 | PUBLIC fft_x, fft_y, fft_init, fft_x_m, fft_y_m |
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52 | |
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53 | INTEGER, DIMENSION(:), ALLOCATABLE, SAVE :: ifax_x, ifax_y |
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54 | |
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55 | LOGICAL, SAVE :: init_fft = .FALSE. |
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56 | |
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57 | REAL, SAVE :: sqr_nx, sqr_ny |
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58 | REAL, DIMENSION(:), ALLOCATABLE, SAVE :: trigs_x, trigs_y |
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59 | |
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60 | #if defined( __ibm ) |
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61 | INTEGER, PARAMETER :: nau1 = 20000, nau2 = 22000 |
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62 | ! |
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63 | !-- The following working arrays contain tables and have to be "save" and |
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64 | !-- shared in OpenMP sense |
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65 | REAL, DIMENSION(nau1), SAVE :: aux1, auy1, aux3, auy3 |
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66 | #elif defined( __nec ) |
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67 | INTEGER, SAVE :: nz1 |
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68 | REAL, DIMENSION(:), ALLOCATABLE, SAVE :: trig_xb, trig_xf, trig_yb, & |
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69 | trig_yf |
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70 | #endif |
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71 | |
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72 | ! |
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73 | !-- Public interfaces |
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74 | INTERFACE fft_init |
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75 | MODULE PROCEDURE fft_init |
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76 | END INTERFACE fft_init |
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77 | |
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78 | INTERFACE fft_x |
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79 | MODULE PROCEDURE fft_x |
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80 | END INTERFACE fft_x |
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81 | |
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82 | INTERFACE fft_y |
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83 | MODULE PROCEDURE fft_y |
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84 | END INTERFACE fft_y |
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85 | |
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86 | INTERFACE fft_x_m |
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87 | MODULE PROCEDURE fft_x_m |
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88 | END INTERFACE fft_x_m |
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89 | |
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90 | INTERFACE fft_y_m |
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91 | MODULE PROCEDURE fft_y_m |
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92 | END INTERFACE fft_y_m |
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93 | |
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94 | CONTAINS |
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95 | |
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96 | |
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97 | SUBROUTINE fft_init |
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98 | |
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99 | IMPLICIT NONE |
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100 | |
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101 | ! |
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102 | !-- The following temporary working arrays have to be on stack or private |
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103 | !-- in OpenMP sense |
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104 | #if defined( __ibm ) |
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105 | REAL, DIMENSION(0:nx+2) :: workx |
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106 | REAL, DIMENSION(0:ny+2) :: worky |
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107 | REAL, DIMENSION(nau2) :: aux2, auy2, aux4, auy4 |
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108 | #elif defined( __nec ) |
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109 | REAL, DIMENSION(0:nx+3,nz+1) :: work_x |
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110 | REAL, DIMENSION(0:ny+3,nz+1) :: work_y |
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111 | REAL, DIMENSION(6*(nx+3),nz+1) :: workx |
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112 | REAL, DIMENSION(6*(ny+3),nz+1) :: worky |
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113 | #endif |
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114 | |
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115 | ! |
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116 | !-- Return, if already called |
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117 | IF ( init_fft ) THEN |
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118 | RETURN |
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119 | ELSE |
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120 | init_fft = .TRUE. |
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121 | ENDIF |
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122 | |
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123 | IF ( fft_method == 'system-specific' ) THEN |
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124 | |
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125 | sqr_nx = SQRT( 1.0 / ( nx + 1.0 ) ) |
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126 | sqr_ny = SQRT( 1.0 / ( ny + 1.0 ) ) |
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127 | #if defined( __ibm ) && ! defined( __ibmy_special ) |
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128 | ! |
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129 | !-- Initialize tables for fft along x |
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130 | CALL DRCFT( 1, workx, 1, workx, 1, nx+1, 1, 1, sqr_nx, aux1, nau1, & |
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131 | aux2, nau2 ) |
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132 | CALL DCRFT( 1, workx, 1, workx, 1, nx+1, 1, -1, sqr_nx, aux3, nau1, & |
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133 | aux4, nau2 ) |
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134 | ! |
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135 | !-- Initialize tables for fft along y |
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136 | CALL DRCFT( 1, worky, 1, worky, 1, ny+1, 1, 1, sqr_ny, auy1, nau1, & |
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137 | auy2, nau2 ) |
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138 | CALL DCRFT( 1, worky, 1, worky, 1, ny+1, 1, -1, sqr_ny, auy3, nau1, & |
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139 | auy4, nau2 ) |
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140 | #elif defined( __nec ) |
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141 | message_string = 'fft method "' // TRIM( fft_method) // & |
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142 | '" currently does not work on NEC' |
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143 | CALL message( 'fft_init', 'PA0187', 1, 2, 0, 6, 0 ) |
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144 | |
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145 | ALLOCATE( trig_xb(2*(nx+1)), trig_xf(2*(nx+1)), & |
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146 | trig_yb(2*(ny+1)), trig_yf(2*(ny+1)) ) |
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147 | |
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148 | work_x = 0.0 |
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149 | work_y = 0.0 |
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150 | nz1 = nz + MOD( nz+1, 2 ) ! odd nz slows down fft significantly |
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151 | ! when using the NEC ffts |
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152 | |
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153 | ! |
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154 | !-- Initialize tables for fft along x (non-vector and vector case (M)) |
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155 | CALL DZFFT( 0, nx+1, sqr_nx, work_x, work_x, trig_xf, workx, 0 ) |
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156 | CALL ZDFFT( 0, nx+1, sqr_nx, work_x, work_x, trig_xb, workx, 0 ) |
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157 | CALL DZFFTM( 0, nx+1, nz1, sqr_nx, work_x, nx+4, work_x, nx+4, & |
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158 | trig_xf, workx, 0 ) |
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159 | CALL ZDFFTM( 0, nx+1, nz1, sqr_nx, work_x, nx+4, work_x, nx+4, & |
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160 | trig_xb, workx, 0 ) |
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161 | ! |
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162 | !-- Initialize tables for fft along y (non-vector and vector case (M)) |
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163 | CALL DZFFT( 0, ny+1, sqr_ny, work_y, work_y, trig_yf, worky, 0 ) |
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164 | CALL ZDFFT( 0, ny+1, sqr_ny, work_y, work_y, trig_yb, worky, 0 ) |
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165 | CALL DZFFTM( 0, ny+1, nz1, sqr_ny, work_y, ny+4, work_y, ny+4, & |
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166 | trig_yf, worky, 0 ) |
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167 | CALL ZDFFTM( 0, ny+1, nz1, sqr_ny, work_y, ny+4, work_y, ny+4, & |
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168 | trig_yb, worky, 0 ) |
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169 | #else |
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170 | message_string = 'no system-specific fft-call available' |
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171 | CALL message( 'fft_init', 'PA0188', 1, 2, 0, 6, 0 ) |
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172 | #endif |
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173 | ELSEIF ( fft_method == 'temperton-algorithm' ) THEN |
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174 | ! |
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175 | !-- Temperton-algorithm |
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176 | !-- Initialize tables for fft along x and y |
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177 | ALLOCATE( ifax_x(nx+1), ifax_y(ny+1), trigs_x(nx+1), trigs_y(ny+1) ) |
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178 | |
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179 | CALL set99( trigs_x, ifax_x, nx+1 ) |
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180 | CALL set99( trigs_y, ifax_y, ny+1 ) |
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181 | |
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182 | ELSEIF ( fft_method == 'singleton-algorithm' ) THEN |
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183 | |
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184 | CONTINUE |
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185 | |
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186 | ELSE |
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187 | |
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188 | message_string = 'fft method "' // TRIM( fft_method) // & |
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189 | '" not available' |
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190 | CALL message( 'fft_init', 'PA0189', 1, 2, 0, 6, 0 ) |
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191 | ENDIF |
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192 | |
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193 | END SUBROUTINE fft_init |
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194 | |
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195 | |
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196 | SUBROUTINE fft_x( ar, direction ) |
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197 | |
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198 | !----------------------------------------------------------------------! |
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199 | ! fft_x ! |
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200 | ! ! |
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201 | ! Fourier-transformation along x-direction ! |
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202 | ! ! |
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203 | ! fft_x uses internal algorithms (Singleton or Temperton) or ! |
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204 | ! system-specific routines, if they are available ! |
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205 | !----------------------------------------------------------------------! |
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206 | |
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207 | IMPLICIT NONE |
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208 | |
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209 | CHARACTER (LEN=*) :: direction |
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210 | INTEGER :: i, ishape(1) |
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211 | |
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212 | !kk REAL, DIMENSION(:) :: ar !kk Does NOT work (Bug??) |
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213 | REAL, DIMENSION(0:nx) :: ar |
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214 | REAL, DIMENSION(0:nx+2) :: work |
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215 | REAL, DIMENSION(nx+2) :: work1 |
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216 | COMPLEX, DIMENSION(:), ALLOCATABLE :: cwork |
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217 | #if defined( __ibm ) |
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218 | REAL, DIMENSION(nau2) :: aux2, aux4 |
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219 | #elif defined( __nec ) |
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220 | REAL, DIMENSION(6*(nx+1)) :: work2 |
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221 | #endif |
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222 | |
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223 | IF ( fft_method == 'singleton-algorithm' ) THEN |
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224 | |
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225 | ! |
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226 | !-- Performing the fft with singleton's software works on every system, |
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227 | !-- since it is part of the model |
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228 | ALLOCATE( cwork(0:nx) ) |
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229 | |
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230 | IF ( direction == 'forward') then |
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231 | |
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232 | DO i = 0, nx |
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233 | cwork(i) = CMPLX( ar(i) ) |
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234 | ENDDO |
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235 | ishape = SHAPE( cwork ) |
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236 | CALL FFTN( cwork, ishape ) |
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237 | |
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238 | DO i = 0, (nx+1)/2 |
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239 | ar(i) = REAL( cwork(i) ) |
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240 | ENDDO |
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241 | DO i = 1, (nx+1)/2 - 1 |
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242 | ar(nx+1-i) = -AIMAG( cwork(i) ) |
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243 | ENDDO |
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244 | |
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245 | ELSE |
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246 | |
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247 | cwork(0) = CMPLX( ar(0), 0.0 ) |
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248 | DO i = 1, (nx+1)/2 - 1 |
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249 | cwork(i) = CMPLX( ar(i), -ar(nx+1-i) ) |
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250 | cwork(nx+1-i) = CMPLX( ar(i), ar(nx+1-i) ) |
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251 | ENDDO |
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252 | cwork((nx+1)/2) = CMPLX( ar((nx+1)/2), 0.0 ) |
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253 | |
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254 | ishape = SHAPE( cwork ) |
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255 | CALL FFTN( cwork, ishape, inv = .TRUE. ) |
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256 | |
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257 | DO i = 0, nx |
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258 | ar(i) = REAL( cwork(i) ) |
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259 | ENDDO |
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260 | |
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261 | ENDIF |
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262 | |
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263 | DEALLOCATE( cwork ) |
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264 | |
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265 | ELSEIF ( fft_method == 'temperton-algorithm' ) THEN |
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266 | |
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267 | ! |
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268 | !-- Performing the fft with Temperton's software works on every system, |
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269 | !-- since it is part of the model |
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270 | IF ( direction == 'forward' ) THEN |
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271 | |
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272 | work(0:nx) = ar |
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273 | CALL fft991cy( work, work1, trigs_x, ifax_x, 1, nx+1, nx+1, 1, -1 ) |
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274 | |
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275 | DO i = 0, (nx+1)/2 |
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276 | ar(i) = work(2*i) |
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277 | ENDDO |
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278 | DO i = 1, (nx+1)/2 - 1 |
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279 | ar(nx+1-i) = work(2*i+1) |
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280 | ENDDO |
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281 | |
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282 | ELSE |
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283 | |
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284 | DO i = 0, (nx+1)/2 |
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285 | work(2*i) = ar(i) |
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286 | ENDDO |
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287 | DO i = 1, (nx+1)/2 - 1 |
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288 | work(2*i+1) = ar(nx+1-i) |
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289 | ENDDO |
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290 | work(1) = 0.0 |
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291 | work(nx+2) = 0.0 |
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292 | |
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293 | CALL fft991cy( work, work1, trigs_x, ifax_x, 1, nx+1, nx+1, 1, 1 ) |
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294 | ar = work(0:nx) |
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295 | |
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296 | ENDIF |
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297 | |
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298 | ELSEIF ( fft_method == 'system-specific' ) THEN |
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299 | |
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300 | #if defined( __ibm ) && ! defined( __ibmy_special ) |
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301 | IF ( direction == 'forward' ) THEN |
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302 | |
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303 | CALL DRCFT( 0, ar, 1, work, 1, nx+1, 1, 1, sqr_nx, aux1, nau1, & |
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304 | aux2, nau2 ) |
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305 | |
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306 | DO i = 0, (nx+1)/2 |
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307 | ar(i) = work(2*i) |
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308 | ENDDO |
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309 | DO i = 1, (nx+1)/2 - 1 |
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310 | ar(nx+1-i) = work(2*i+1) |
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311 | ENDDO |
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312 | |
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313 | ELSE |
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314 | |
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315 | DO i = 0, (nx+1)/2 |
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316 | work(2*i) = ar(i) |
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317 | ENDDO |
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318 | DO i = 1, (nx+1)/2 - 1 |
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319 | work(2*i+1) = ar(nx+1-i) |
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320 | ENDDO |
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321 | work(1) = 0.0 |
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322 | work(nx+2) = 0.0 |
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323 | |
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324 | CALL DCRFT( 0, work, 1, work, 1, nx+1, 1, -1, sqr_nx, aux3, nau1, & |
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325 | aux4, nau2 ) |
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326 | |
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327 | DO i = 0, nx |
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328 | ar(i) = work(i) |
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329 | ENDDO |
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330 | |
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331 | ENDIF |
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332 | #elif defined( __nec ) |
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333 | IF ( direction == 'forward' ) THEN |
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334 | |
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335 | work(0:nx) = ar(0:nx) |
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336 | |
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337 | CALL DZFFT( 1, nx+1, sqr_nx, work, work, trig_xf, work2, 0 ) |
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338 | |
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339 | DO i = 0, (nx+1)/2 |
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340 | ar(i) = work(2*i) |
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341 | ENDDO |
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342 | DO i = 1, (nx+1)/2 - 1 |
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343 | ar(nx+1-i) = work(2*i+1) |
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344 | ENDDO |
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345 | |
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346 | ELSE |
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347 | |
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348 | DO i = 0, (nx+1)/2 |
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349 | work(2*i) = ar(i) |
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350 | ENDDO |
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351 | DO i = 1, (nx+1)/2 - 1 |
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352 | work(2*i+1) = ar(nx+1-i) |
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353 | ENDDO |
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354 | work(1) = 0.0 |
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355 | work(nx+2) = 0.0 |
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356 | |
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357 | CALL ZDFFT( -1, nx+1, sqr_nx, work, work, trig_xb, work2, 0 ) |
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358 | |
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359 | ar(0:nx) = work(0:nx) |
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360 | |
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361 | ENDIF |
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362 | #else |
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363 | message_string = 'no system-specific fft-call available' |
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364 | CALL message( 'fft_x', 'PA0188', 1, 2, 0, 6, 0 ) |
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365 | #endif |
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366 | ELSE |
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367 | message_string = 'fft method "' // TRIM( fft_method) // & |
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368 | '" not available' |
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369 | CALL message( 'fft_x', 'PA0189', 1, 2, 0, 6, 0 ) |
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370 | |
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371 | ENDIF |
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372 | |
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373 | END SUBROUTINE fft_x |
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374 | |
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375 | SUBROUTINE fft_y( ar, direction ) |
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376 | |
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377 | !----------------------------------------------------------------------! |
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378 | ! fft_y ! |
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379 | ! ! |
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380 | ! Fourier-transformation along y-direction ! |
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381 | ! ! |
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382 | ! fft_y uses internal algorithms (Singleton or Temperton) or ! |
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383 | ! system-specific routines, if they are available ! |
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384 | !----------------------------------------------------------------------! |
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385 | |
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386 | IMPLICIT NONE |
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387 | |
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388 | CHARACTER (LEN=*) :: direction |
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389 | INTEGER :: j, jshape(1) |
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390 | |
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391 | !kk REAL, DIMENSION(:) :: ar !kk Does NOT work (Bug??) |
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392 | REAL, DIMENSION(0:ny) :: ar |
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393 | REAL, DIMENSION(0:ny+2) :: work |
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394 | REAL, DIMENSION(ny+2) :: work1 |
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395 | COMPLEX, DIMENSION(:), ALLOCATABLE :: cwork |
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396 | #if defined( __ibm ) |
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397 | REAL, DIMENSION(nau2) :: auy2, auy4 |
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398 | #elif defined( __nec ) |
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399 | REAL, DIMENSION(6*(ny+1)) :: work2 |
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400 | #endif |
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401 | |
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402 | IF ( fft_method == 'singleton-algorithm' ) THEN |
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403 | |
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404 | ! |
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405 | !-- Performing the fft with singleton's software works on every system, |
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406 | !-- since it is part of the model |
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407 | ALLOCATE( cwork(0:ny) ) |
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408 | |
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409 | IF ( direction == 'forward') THEN |
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410 | |
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411 | DO j = 0, ny |
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412 | cwork(j) = CMPLX( ar(j) ) |
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413 | ENDDO |
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414 | |
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415 | jshape = SHAPE( cwork ) |
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416 | CALL FFTN( cwork, jshape ) |
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417 | |
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418 | DO j = 0, (ny+1)/2 |
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419 | ar(j) = REAL( cwork(j) ) |
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420 | ENDDO |
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421 | DO j = 1, (ny+1)/2 - 1 |
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422 | ar(ny+1-j) = -AIMAG( cwork(j) ) |
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423 | ENDDO |
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424 | |
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425 | ELSE |
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426 | |
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427 | cwork(0) = CMPLX( ar(0), 0.0 ) |
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428 | DO j = 1, (ny+1)/2 - 1 |
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429 | cwork(j) = CMPLX( ar(j), -ar(ny+1-j) ) |
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430 | cwork(ny+1-j) = CMPLX( ar(j), ar(ny+1-j) ) |
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431 | ENDDO |
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432 | cwork((ny+1)/2) = CMPLX( ar((ny+1)/2), 0.0 ) |
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433 | |
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434 | jshape = SHAPE( cwork ) |
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435 | CALL FFTN( cwork, jshape, inv = .TRUE. ) |
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436 | |
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437 | DO j = 0, ny |
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438 | ar(j) = REAL( cwork(j) ) |
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439 | ENDDO |
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440 | |
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441 | ENDIF |
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442 | |
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443 | DEALLOCATE( cwork ) |
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444 | |
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445 | ELSEIF ( fft_method == 'temperton-algorithm' ) THEN |
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446 | |
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447 | ! |
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448 | !-- Performing the fft with Temperton's software works on every system, |
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449 | !-- since it is part of the model |
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450 | IF ( direction == 'forward' ) THEN |
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451 | |
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452 | work(0:ny) = ar |
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453 | CALL fft991cy( work, work1, trigs_y, ifax_y, 1, ny+1, ny+1, 1, -1 ) |
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454 | |
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455 | DO j = 0, (ny+1)/2 |
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456 | ar(j) = work(2*j) |
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457 | ENDDO |
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458 | DO j = 1, (ny+1)/2 - 1 |
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459 | ar(ny+1-j) = work(2*j+1) |
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460 | ENDDO |
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461 | |
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462 | ELSE |
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463 | |
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464 | DO j = 0, (ny+1)/2 |
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465 | work(2*j) = ar(j) |
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466 | ENDDO |
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467 | DO j = 1, (ny+1)/2 - 1 |
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468 | work(2*j+1) = ar(ny+1-j) |
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469 | ENDDO |
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470 | work(1) = 0.0 |
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471 | work(ny+2) = 0.0 |
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472 | |
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473 | CALL fft991cy( work, work1, trigs_y, ifax_y, 1, ny+1, ny+1, 1, 1 ) |
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474 | ar = work(0:ny) |
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475 | |
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476 | ENDIF |
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477 | |
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478 | ELSEIF ( fft_method == 'system-specific' ) THEN |
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479 | |
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480 | #if defined( __ibm ) && ! defined( __ibmy_special ) |
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481 | IF ( direction == 'forward') THEN |
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482 | |
---|
483 | CALL DRCFT( 0, ar, 1, work, 1, ny+1, 1, 1, sqr_ny, auy1, nau1, & |
---|
484 | auy2, nau2 ) |
---|
485 | |
---|
486 | DO j = 0, (ny+1)/2 |
---|
487 | ar(j) = work(2*j) |
---|
488 | ENDDO |
---|
489 | DO j = 1, (ny+1)/2 - 1 |
---|
490 | ar(ny+1-j) = work(2*j+1) |
---|
491 | ENDDO |
---|
492 | |
---|
493 | ELSE |
---|
494 | |
---|
495 | DO j = 0, (ny+1)/2 |
---|
496 | work(2*j) = ar(j) |
---|
497 | ENDDO |
---|
498 | DO j = 1, (ny+1)/2 - 1 |
---|
499 | work(2*j+1) = ar(ny+1-j) |
---|
500 | ENDDO |
---|
501 | work(1) = 0.0 |
---|
502 | work(ny+2) = 0.0 |
---|
503 | |
---|
504 | CALL DCRFT( 0, work, 1, work, 1, ny+1, 1, -1, sqr_ny, auy3, nau1, & |
---|
505 | auy4, nau2 ) |
---|
506 | |
---|
507 | DO j = 0, ny |
---|
508 | ar(j) = work(j) |
---|
509 | ENDDO |
---|
510 | |
---|
511 | ENDIF |
---|
512 | #elif defined( __nec ) |
---|
513 | IF ( direction == 'forward' ) THEN |
---|
514 | |
---|
515 | work(0:ny) = ar(0:ny) |
---|
516 | |
---|
517 | CALL DZFFT( 1, ny+1, sqr_ny, work, work, trig_yf, work2, 0 ) |
---|
518 | |
---|
519 | DO j = 0, (ny+1)/2 |
---|
520 | ar(j) = work(2*j) |
---|
521 | ENDDO |
---|
522 | DO j = 1, (ny+1)/2 - 1 |
---|
523 | ar(ny+1-j) = work(2*j+1) |
---|
524 | ENDDO |
---|
525 | |
---|
526 | ELSE |
---|
527 | |
---|
528 | DO j = 0, (ny+1)/2 |
---|
529 | work(2*j) = ar(j) |
---|
530 | ENDDO |
---|
531 | DO j = 1, (ny+1)/2 - 1 |
---|
532 | work(2*j+1) = ar(ny+1-j) |
---|
533 | ENDDO |
---|
534 | work(1) = 0.0 |
---|
535 | work(ny+2) = 0.0 |
---|
536 | |
---|
537 | CALL ZDFFT( -1, ny+1, sqr_ny, work, work, trig_yb, work2, 0 ) |
---|
538 | |
---|
539 | ar(0:ny) = work(0:ny) |
---|
540 | |
---|
541 | ENDIF |
---|
542 | #else |
---|
543 | message_string = 'no system-specific fft-call available' |
---|
544 | CALL message( 'fft_y', 'PA0188', 1, 2, 0, 6, 0 ) |
---|
545 | |
---|
546 | #endif |
---|
547 | |
---|
548 | ELSE |
---|
549 | |
---|
550 | message_string = 'fft method "' // TRIM( fft_method) // & |
---|
551 | '" not available' |
---|
552 | CALL message( 'fft_y', 'PA0189', 1, 2, 0, 6, 0 ) |
---|
553 | |
---|
554 | ENDIF |
---|
555 | |
---|
556 | END SUBROUTINE fft_y |
---|
557 | |
---|
558 | SUBROUTINE fft_x_m( ar, direction ) |
---|
559 | |
---|
560 | !----------------------------------------------------------------------! |
---|
561 | ! fft_x_m ! |
---|
562 | ! ! |
---|
563 | ! Fourier-transformation along x-direction ! |
---|
564 | ! Version for 1d domain decomposition ! |
---|
565 | ! using multiple 1D FFT from Math Keisan on NEC ! |
---|
566 | ! or Temperton-algorithm ! |
---|
567 | ! (no singleton-algorithm on NEC because it does not vectorize) ! |
---|
568 | ! ! |
---|
569 | !----------------------------------------------------------------------! |
---|
570 | |
---|
571 | IMPLICIT NONE |
---|
572 | |
---|
573 | CHARACTER (LEN=*) :: direction |
---|
574 | INTEGER :: i, k, siza, sizw |
---|
575 | |
---|
576 | REAL, DIMENSION(0:nx,nz) :: ar |
---|
577 | REAL, DIMENSION(0:nx+3,nz+1) :: ai |
---|
578 | REAL, DIMENSION(6*(nx+4),nz+1) :: work1 |
---|
579 | #if defined( __nec ) |
---|
580 | COMPLEX, DIMENSION((nx+4)/2+1,nz+1) :: work |
---|
581 | #endif |
---|
582 | |
---|
583 | IF ( fft_method == 'temperton-algorithm' ) THEN |
---|
584 | |
---|
585 | siza = SIZE( ai, 1 ) |
---|
586 | |
---|
587 | IF ( direction == 'forward') THEN |
---|
588 | |
---|
589 | ai(0:nx,1:nz) = ar(0:nx,1:nz) |
---|
590 | ai(nx+1:,:) = 0.0 |
---|
591 | |
---|
592 | CALL fft991cy( ai, work1, trigs_x, ifax_x, 1, siza, nx+1, nz, -1 ) |
---|
593 | |
---|
594 | DO k = 1, nz |
---|
595 | DO i = 0, (nx+1)/2 |
---|
596 | ar(i,k) = ai(2*i,k) |
---|
597 | ENDDO |
---|
598 | DO i = 1, (nx+1)/2 - 1 |
---|
599 | ar(nx+1-i,k) = ai(2*i+1,k) |
---|
600 | ENDDO |
---|
601 | ENDDO |
---|
602 | |
---|
603 | ELSE |
---|
604 | |
---|
605 | DO k = 1, nz |
---|
606 | DO i = 0, (nx+1)/2 |
---|
607 | ai(2*i,k) = ar(i,k) |
---|
608 | ENDDO |
---|
609 | DO i = 1, (nx+1)/2 - 1 |
---|
610 | ai(2*i+1,k) = ar(nx+1-i,k) |
---|
611 | ENDDO |
---|
612 | ai(1,k) = 0.0 |
---|
613 | ai(nx+2,k) = 0.0 |
---|
614 | ENDDO |
---|
615 | |
---|
616 | CALL fft991cy( ai, work1, trigs_x, ifax_x, 1, siza, nx+1, nz, 1 ) |
---|
617 | |
---|
618 | ar(0:nx,1:nz) = ai(0:nx,1:nz) |
---|
619 | |
---|
620 | ENDIF |
---|
621 | |
---|
622 | ELSEIF ( fft_method == 'system-specific' ) THEN |
---|
623 | |
---|
624 | #if defined( __nec ) |
---|
625 | siza = SIZE( ai, 1 ) |
---|
626 | sizw = SIZE( work, 1 ) |
---|
627 | |
---|
628 | IF ( direction == 'forward') THEN |
---|
629 | |
---|
630 | ! |
---|
631 | !-- Tables are initialized once more. This call should not be |
---|
632 | !-- necessary, but otherwise program aborts in asymmetric case |
---|
633 | CALL DZFFTM( 0, nx+1, nz1, sqr_nx, work, nx+4, work, nx+4, & |
---|
634 | trig_xf, work1, 0 ) |
---|
635 | |
---|
636 | ai(0:nx,1:nz) = ar(0:nx,1:nz) |
---|
637 | IF ( nz1 > nz ) THEN |
---|
638 | ai(:,nz1) = 0.0 |
---|
639 | ENDIF |
---|
640 | |
---|
641 | CALL DZFFTM( 1, nx+1, nz1, sqr_nx, ai, siza, work, sizw, & |
---|
642 | trig_xf, work1, 0 ) |
---|
643 | |
---|
644 | DO k = 1, nz |
---|
645 | DO i = 0, (nx+1)/2 |
---|
646 | ar(i,k) = REAL( work(i+1,k) ) |
---|
647 | ENDDO |
---|
648 | DO i = 1, (nx+1)/2 - 1 |
---|
649 | ar(nx+1-i,k) = AIMAG( work(i+1,k) ) |
---|
650 | ENDDO |
---|
651 | ENDDO |
---|
652 | |
---|
653 | ELSE |
---|
654 | |
---|
655 | ! |
---|
656 | !-- Tables are initialized once more. This call should not be |
---|
657 | !-- necessary, but otherwise program aborts in asymmetric case |
---|
658 | CALL ZDFFTM( 0, nx+1, nz1, sqr_nx, work, nx+4, work, nx+4, & |
---|
659 | trig_xb, work1, 0 ) |
---|
660 | |
---|
661 | IF ( nz1 > nz ) THEN |
---|
662 | work(:,nz1) = 0.0 |
---|
663 | ENDIF |
---|
664 | DO k = 1, nz |
---|
665 | work(1,k) = CMPLX( ar(0,k), 0.0 ) |
---|
666 | DO i = 1, (nx+1)/2 - 1 |
---|
667 | work(i+1,k) = CMPLX( ar(i,k), ar(nx+1-i,k) ) |
---|
668 | ENDDO |
---|
669 | work(((nx+1)/2)+1,k) = CMPLX( ar((nx+1)/2,k), 0.0 ) |
---|
670 | ENDDO |
---|
671 | |
---|
672 | CALL ZDFFTM( -1, nx+1, nz1, sqr_nx, work, sizw, ai, siza, & |
---|
673 | trig_xb, work1, 0 ) |
---|
674 | |
---|
675 | ar(0:nx,1:nz) = ai(0:nx,1:nz) |
---|
676 | |
---|
677 | ENDIF |
---|
678 | |
---|
679 | #else |
---|
680 | message_string = 'no system-specific fft-call available' |
---|
681 | CALL message( 'fft_x_m', 'PA0188', 1, 2, 0, 6, 0 ) |
---|
682 | #endif |
---|
683 | |
---|
684 | ELSE |
---|
685 | |
---|
686 | message_string = 'fft method "' // TRIM( fft_method) // & |
---|
687 | '" not available' |
---|
688 | CALL message( 'fft_x_m', 'PA0189', 1, 2, 0, 6, 0 ) |
---|
689 | |
---|
690 | ENDIF |
---|
691 | |
---|
692 | END SUBROUTINE fft_x_m |
---|
693 | |
---|
694 | SUBROUTINE fft_y_m( ar, ny1, direction ) |
---|
695 | |
---|
696 | !----------------------------------------------------------------------! |
---|
697 | ! fft_y_m ! |
---|
698 | ! ! |
---|
699 | ! Fourier-transformation along y-direction ! |
---|
700 | ! Version for 1d domain decomposition ! |
---|
701 | ! using multiple 1D FFT from Math Keisan on NEC ! |
---|
702 | ! or Temperton-algorithm ! |
---|
703 | ! (no singleton-algorithm on NEC because it does not vectorize) ! |
---|
704 | ! ! |
---|
705 | !----------------------------------------------------------------------! |
---|
706 | |
---|
707 | IMPLICIT NONE |
---|
708 | |
---|
709 | CHARACTER (LEN=*) :: direction |
---|
710 | INTEGER :: j, k, ny1, siza, sizw |
---|
711 | |
---|
712 | REAL, DIMENSION(0:ny1,nz) :: ar |
---|
713 | REAL, DIMENSION(0:ny+3,nz+1) :: ai |
---|
714 | REAL, DIMENSION(6*(ny+4),nz+1) :: work1 |
---|
715 | #if defined( __nec ) |
---|
716 | COMPLEX, DIMENSION((ny+4)/2+1,nz+1) :: work |
---|
717 | #endif |
---|
718 | |
---|
719 | IF ( fft_method == 'temperton-algorithm' ) THEN |
---|
720 | |
---|
721 | siza = SIZE( ai, 1 ) |
---|
722 | |
---|
723 | IF ( direction == 'forward') THEN |
---|
724 | |
---|
725 | ai(0:ny,1:nz) = ar(0:ny,1:nz) |
---|
726 | ai(ny+1:,:) = 0.0 |
---|
727 | |
---|
728 | CALL fft991cy( ai, work1, trigs_y, ifax_y, 1, siza, ny+1, nz, -1 ) |
---|
729 | |
---|
730 | DO k = 1, nz |
---|
731 | DO j = 0, (ny+1)/2 |
---|
732 | ar(j,k) = ai(2*j,k) |
---|
733 | ENDDO |
---|
734 | DO j = 1, (ny+1)/2 - 1 |
---|
735 | ar(ny+1-j,k) = ai(2*j+1,k) |
---|
736 | ENDDO |
---|
737 | ENDDO |
---|
738 | |
---|
739 | ELSE |
---|
740 | |
---|
741 | DO k = 1, nz |
---|
742 | DO j = 0, (ny+1)/2 |
---|
743 | ai(2*j,k) = ar(j,k) |
---|
744 | ENDDO |
---|
745 | DO j = 1, (ny+1)/2 - 1 |
---|
746 | ai(2*j+1,k) = ar(ny+1-j,k) |
---|
747 | ENDDO |
---|
748 | ai(1,k) = 0.0 |
---|
749 | ai(ny+2,k) = 0.0 |
---|
750 | ENDDO |
---|
751 | |
---|
752 | CALL fft991cy( ai, work1, trigs_y, ifax_y, 1, siza, ny+1, nz, 1 ) |
---|
753 | |
---|
754 | ar(0:ny,1:nz) = ai(0:ny,1:nz) |
---|
755 | |
---|
756 | ENDIF |
---|
757 | |
---|
758 | ELSEIF ( fft_method == 'system-specific' ) THEN |
---|
759 | |
---|
760 | #if defined( __nec ) |
---|
761 | siza = SIZE( ai, 1 ) |
---|
762 | sizw = SIZE( work, 1 ) |
---|
763 | |
---|
764 | IF ( direction == 'forward') THEN |
---|
765 | |
---|
766 | ! |
---|
767 | !-- Tables are initialized once more. This call should not be |
---|
768 | !-- necessary, but otherwise program aborts in asymmetric case |
---|
769 | CALL DZFFTM( 0, ny+1, nz1, sqr_ny, work, ny+4, work, ny+4, & |
---|
770 | trig_yf, work1, 0 ) |
---|
771 | |
---|
772 | ai(0:ny,1:nz) = ar(0:ny,1:nz) |
---|
773 | IF ( nz1 > nz ) THEN |
---|
774 | ai(:,nz1) = 0.0 |
---|
775 | ENDIF |
---|
776 | |
---|
777 | CALL DZFFTM( 1, ny+1, nz1, sqr_ny, ai, siza, work, sizw, & |
---|
778 | trig_yf, work1, 0 ) |
---|
779 | |
---|
780 | DO k = 1, nz |
---|
781 | DO j = 0, (ny+1)/2 |
---|
782 | ar(j,k) = REAL( work(j+1,k) ) |
---|
783 | ENDDO |
---|
784 | DO j = 1, (ny+1)/2 - 1 |
---|
785 | ar(ny+1-j,k) = AIMAG( work(j+1,k) ) |
---|
786 | ENDDO |
---|
787 | ENDDO |
---|
788 | |
---|
789 | ELSE |
---|
790 | |
---|
791 | ! |
---|
792 | !-- Tables are initialized once more. This call should not be |
---|
793 | !-- necessary, but otherwise program aborts in asymmetric case |
---|
794 | CALL ZDFFTM( 0, ny+1, nz1, sqr_ny, work, ny+4, work, ny+4, & |
---|
795 | trig_yb, work1, 0 ) |
---|
796 | |
---|
797 | IF ( nz1 > nz ) THEN |
---|
798 | work(:,nz1) = 0.0 |
---|
799 | ENDIF |
---|
800 | DO k = 1, nz |
---|
801 | work(1,k) = CMPLX( ar(0,k), 0.0 ) |
---|
802 | DO j = 1, (ny+1)/2 - 1 |
---|
803 | work(j+1,k) = CMPLX( ar(j,k), ar(ny+1-j,k) ) |
---|
804 | ENDDO |
---|
805 | work(((ny+1)/2)+1,k) = CMPLX( ar((ny+1)/2,k), 0.0 ) |
---|
806 | ENDDO |
---|
807 | |
---|
808 | CALL ZDFFTM( -1, ny+1, nz1, sqr_ny, work, sizw, ai, siza, & |
---|
809 | trig_yb, work1, 0 ) |
---|
810 | |
---|
811 | ar(0:ny,1:nz) = ai(0:ny,1:nz) |
---|
812 | |
---|
813 | ENDIF |
---|
814 | |
---|
815 | #else |
---|
816 | message_string = 'no system-specific fft-call available' |
---|
817 | CALL message( 'fft_y_m', 'PA0188', 1, 2, 0, 6, 0 ) |
---|
818 | #endif |
---|
819 | |
---|
820 | ELSE |
---|
821 | |
---|
822 | message_string = 'fft method "' // TRIM( fft_method) // & |
---|
823 | '" not available' |
---|
824 | CALL message( 'fft_x_m', 'PA0189', 1, 2, 0, 6, 0 ) |
---|
825 | |
---|
826 | ENDIF |
---|
827 | |
---|
828 | END SUBROUTINE fft_y_m |
---|
829 | |
---|
830 | END MODULE fft_xy |
---|