-
Notifications
You must be signed in to change notification settings - Fork 5
/
Copy pathmrgrnk.f90
619 lines (616 loc) · 16.8 KB
/
mrgrnk.f90
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
!>
!! \brief This module contains data and routines for Merge-sort ranking of an array
!!
!! \b Author: ?
!!
!! \b Date:
!!
!! \b Version:
!!
Module m_mrgrnk
Integer, Parameter :: kdp = selected_real_kind(15)
public :: mrgrnk
private :: kdp
private :: R_mrgrnk, I_mrgrnk, D_mrgrnk
interface mrgrnk
module procedure D_mrgrnk, R_mrgrnk, I_mrgrnk
end interface mrgrnk
contains
Subroutine D_mrgrnk (XDONT, IRNGT)
! __________________________________________________________
! MRGRNK = Merge-sort ranking of an array
! For performance reasons, the first 2 passes are taken
! out of the standard loop, and use dedicated coding.
! __________________________________________________________
! __________________________________________________________
Real (kind=kdp), Dimension (:), Intent (In) :: XDONT
Integer, Dimension (:), Intent (Out) :: IRNGT
! __________________________________________________________
Real (kind=kdp) :: XVALA, XVALB
!
Integer, Dimension (SIZE(IRNGT)) :: JWRKT
Integer :: LMTNA, LMTNC, IRNG1, IRNG2
Integer :: NVAL, IIND, IWRKD, IWRK, IWRKF, JINDA, IINDA, IINDB
!
NVAL = Min (SIZE(XDONT), SIZE(IRNGT))
Select Case (NVAL)
Case (:0)
Return
Case (1)
IRNGT (1) = 1
Return
Case Default
Continue
End Select
!
! Fill-in the index array, creating ordered couples
!
Do IIND = 2, NVAL, 2
If (XDONT(IIND-1) <= XDONT(IIND)) Then
IRNGT (IIND-1) = IIND - 1
IRNGT (IIND) = IIND
Else
IRNGT (IIND-1) = IIND
IRNGT (IIND) = IIND - 1
End If
End Do
If (Modulo(NVAL, 2) /= 0) Then
IRNGT (NVAL) = NVAL
End If
!
! We will now have ordered subsets A - B - A - B - ...
! and merge A and B couples into C - C - ...
!
LMTNA = 2
LMTNC = 4
!
! First iteration. The length of the ordered subsets goes from 2 to 4
!
Do
If (NVAL <= 2) Exit
!
! Loop on merges of A and B into C
!
Do IWRKD = 0, NVAL - 1, 4
If ((IWRKD+4) > NVAL) Then
If ((IWRKD+2) >= NVAL) Exit
!
! 1 2 3
!
If (XDONT(IRNGT(IWRKD+2)) <= XDONT(IRNGT(IWRKD+3))) Exit
!
! 1 3 2
!
If (XDONT(IRNGT(IWRKD+1)) <= XDONT(IRNGT(IWRKD+3))) Then
IRNG2 = IRNGT (IWRKD+2)
IRNGT (IWRKD+2) = IRNGT (IWRKD+3)
IRNGT (IWRKD+3) = IRNG2
!
! 3 1 2
!
Else
IRNG1 = IRNGT (IWRKD+1)
IRNGT (IWRKD+1) = IRNGT (IWRKD+3)
IRNGT (IWRKD+3) = IRNGT (IWRKD+2)
IRNGT (IWRKD+2) = IRNG1
End If
Exit
End If
!
! 1 2 3 4
!
If (XDONT(IRNGT(IWRKD+2)) <= XDONT(IRNGT(IWRKD+3))) Cycle
!
! 1 3 x x
!
If (XDONT(IRNGT(IWRKD+1)) <= XDONT(IRNGT(IWRKD+3))) Then
IRNG2 = IRNGT (IWRKD+2)
IRNGT (IWRKD+2) = IRNGT (IWRKD+3)
If (XDONT(IRNG2) <= XDONT(IRNGT(IWRKD+4))) Then
! 1 3 2 4
IRNGT (IWRKD+3) = IRNG2
Else
! 1 3 4 2
IRNGT (IWRKD+3) = IRNGT (IWRKD+4)
IRNGT (IWRKD+4) = IRNG2
End If
!
! 3 x x x
!
Else
IRNG1 = IRNGT (IWRKD+1)
IRNG2 = IRNGT (IWRKD+2)
IRNGT (IWRKD+1) = IRNGT (IWRKD+3)
If (XDONT(IRNG1) <= XDONT(IRNGT(IWRKD+4))) Then
IRNGT (IWRKD+2) = IRNG1
If (XDONT(IRNG2) <= XDONT(IRNGT(IWRKD+4))) Then
! 3 1 2 4
IRNGT (IWRKD+3) = IRNG2
Else
! 3 1 4 2
IRNGT (IWRKD+3) = IRNGT (IWRKD+4)
IRNGT (IWRKD+4) = IRNG2
End If
Else
! 3 4 1 2
IRNGT (IWRKD+2) = IRNGT (IWRKD+4)
IRNGT (IWRKD+3) = IRNG1
IRNGT (IWRKD+4) = IRNG2
End If
End If
End Do
!
! The Cs become As and Bs
!
LMTNA = 4
Exit
End Do
!
! Iteration loop. Each time, the length of the ordered subsets
! is doubled.
!
Do
If (LMTNA >= NVAL) Exit
IWRKF = 0
LMTNC = 2 * LMTNC
!
! Loop on merges of A and B into C
!
Do
IWRK = IWRKF
IWRKD = IWRKF + 1
JINDA = IWRKF + LMTNA
IWRKF = IWRKF + LMTNC
If (IWRKF >= NVAL) Then
If (JINDA >= NVAL) Exit
IWRKF = NVAL
End If
IINDA = 1
IINDB = JINDA + 1
!
! Shortcut for the case when the max of A is smaller
! than the min of B. This line may be activated when the
! initial set is already close to sorted.
!
! IF (XDONT(IRNGT(JINDA)) <= XDONT(IRNGT(IINDB))) CYCLE
!
! One steps in the C subset, that we build in the final rank array
!
! Make a copy of the rank array for the merge iteration
!
JWRKT (1:LMTNA) = IRNGT (IWRKD:JINDA)
!
XVALA = XDONT (JWRKT(IINDA))
XVALB = XDONT (IRNGT(IINDB))
!
Do
IWRK = IWRK + 1
!
! We still have unprocessed values in both A and B
!
If (XVALA > XVALB) Then
IRNGT (IWRK) = IRNGT (IINDB)
IINDB = IINDB + 1
If (IINDB > IWRKF) Then
! Only A still with unprocessed values
IRNGT (IWRK+1:IWRKF) = JWRKT (IINDA:LMTNA)
Exit
End If
XVALB = XDONT (IRNGT(IINDB))
Else
IRNGT (IWRK) = JWRKT (IINDA)
IINDA = IINDA + 1
If (IINDA > LMTNA) Exit! Only B still with unprocessed values
XVALA = XDONT (JWRKT(IINDA))
End If
!
End Do
End Do
!
! The Cs become As and Bs
!
LMTNA = 2 * LMTNA
End Do
!
Return
!
End Subroutine D_mrgrnk
Subroutine R_mrgrnk (XDONT, IRNGT)
! __________________________________________________________
! MRGRNK = Merge-sort ranking of an array
! For performance reasons, the first 2 passes are taken
! out of the standard loop, and use dedicated coding.
! __________________________________________________________
! _________________________________________________________
Real, Dimension (:), Intent (In) :: XDONT
Integer, Dimension (:), Intent (Out) :: IRNGT
! __________________________________________________________
Real :: XVALA, XVALB
!
Integer, Dimension (SIZE(IRNGT)) :: JWRKT
Integer :: LMTNA, LMTNC, IRNG1, IRNG2
Integer :: NVAL, IIND, IWRKD, IWRK, IWRKF, JINDA, IINDA, IINDB
!
NVAL = Min (SIZE(XDONT), SIZE(IRNGT))
Select Case (NVAL)
Case (:0)
Return
Case (1)
IRNGT (1) = 1
Return
Case Default
Continue
End Select
!
! Fill-in the index array, creating ordered couples
!
Do IIND = 2, NVAL, 2
If (XDONT(IIND-1) <= XDONT(IIND)) Then
IRNGT (IIND-1) = IIND - 1
IRNGT (IIND) = IIND
Else
IRNGT (IIND-1) = IIND
IRNGT (IIND) = IIND - 1
End If
End Do
If (Modulo(NVAL, 2) /= 0) Then
IRNGT (NVAL) = NVAL
End If
!
! We will now have ordered subsets A - B - A - B - ...
! and merge A and B couples into C - C - ...
!
LMTNA = 2
LMTNC = 4
!
! First iteration. The length of the ordered subsets goes from 2 to 4
!
Do
If (NVAL <= 2) Exit
!
! Loop on merges of A and B into C
!
Do IWRKD = 0, NVAL - 1, 4
If ((IWRKD+4) > NVAL) Then
If ((IWRKD+2) >= NVAL) Exit
!
! 1 2 3
!
If (XDONT(IRNGT(IWRKD+2)) <= XDONT(IRNGT(IWRKD+3))) Exit
!
! 1 3 2
!
If (XDONT(IRNGT(IWRKD+1)) <= XDONT(IRNGT(IWRKD+3))) Then
IRNG2 = IRNGT (IWRKD+2)
IRNGT (IWRKD+2) = IRNGT (IWRKD+3)
IRNGT (IWRKD+3) = IRNG2
!
! 3 1 2
!
Else
IRNG1 = IRNGT (IWRKD+1)
IRNGT (IWRKD+1) = IRNGT (IWRKD+3)
IRNGT (IWRKD+3) = IRNGT (IWRKD+2)
IRNGT (IWRKD+2) = IRNG1
End If
Exit
End If
!
! 1 2 3 4
!
If (XDONT(IRNGT(IWRKD+2)) <= XDONT(IRNGT(IWRKD+3))) Cycle
!
! 1 3 x x
!
If (XDONT(IRNGT(IWRKD+1)) <= XDONT(IRNGT(IWRKD+3))) Then
IRNG2 = IRNGT (IWRKD+2)
IRNGT (IWRKD+2) = IRNGT (IWRKD+3)
If (XDONT(IRNG2) <= XDONT(IRNGT(IWRKD+4))) Then
! 1 3 2 4
IRNGT (IWRKD+3) = IRNG2
Else
! 1 3 4 2
IRNGT (IWRKD+3) = IRNGT (IWRKD+4)
IRNGT (IWRKD+4) = IRNG2
End If
!
! 3 x x x
!
Else
IRNG1 = IRNGT (IWRKD+1)
IRNG2 = IRNGT (IWRKD+2)
IRNGT (IWRKD+1) = IRNGT (IWRKD+3)
If (XDONT(IRNG1) <= XDONT(IRNGT(IWRKD+4))) Then
IRNGT (IWRKD+2) = IRNG1
If (XDONT(IRNG2) <= XDONT(IRNGT(IWRKD+4))) Then
! 3 1 2 4
IRNGT (IWRKD+3) = IRNG2
Else
! 3 1 4 2
IRNGT (IWRKD+3) = IRNGT (IWRKD+4)
IRNGT (IWRKD+4) = IRNG2
End If
Else
! 3 4 1 2
IRNGT (IWRKD+2) = IRNGT (IWRKD+4)
IRNGT (IWRKD+3) = IRNG1
IRNGT (IWRKD+4) = IRNG2
End If
End If
End Do
!
! The Cs become As and Bs
!
LMTNA = 4
Exit
End Do
!
! Iteration loop. Each time, the length of the ordered subsets
! is doubled.
!
Do
If (LMTNA >= NVAL) Exit
IWRKF = 0
LMTNC = 2 * LMTNC
!
! Loop on merges of A and B into C
!
Do
IWRK = IWRKF
IWRKD = IWRKF + 1
JINDA = IWRKF + LMTNA
IWRKF = IWRKF + LMTNC
If (IWRKF >= NVAL) Then
If (JINDA >= NVAL) Exit
IWRKF = NVAL
End If
IINDA = 1
IINDB = JINDA + 1
!
! Shortcut for the case when the max of A is smaller
! than the min of B. This line may be activated when the
! initial set is already close to sorted.
!
! IF (XDONT(IRNGT(JINDA)) <= XDONT(IRNGT(IINDB))) CYCLE
!
! One steps in the C subset, that we build in the final rank array
!
! Make a copy of the rank array for the merge iteration
!
JWRKT (1:LMTNA) = IRNGT (IWRKD:JINDA)
!
XVALA = XDONT (JWRKT(IINDA))
XVALB = XDONT (IRNGT(IINDB))
!
Do
IWRK = IWRK + 1
!
! We still have unprocessed values in both A and B
!
If (XVALA > XVALB) Then
IRNGT (IWRK) = IRNGT (IINDB)
IINDB = IINDB + 1
If (IINDB > IWRKF) Then
! Only A still with unprocessed values
IRNGT (IWRK+1:IWRKF) = JWRKT (IINDA:LMTNA)
Exit
End If
XVALB = XDONT (IRNGT(IINDB))
Else
IRNGT (IWRK) = JWRKT (IINDA)
IINDA = IINDA + 1
If (IINDA > LMTNA) Exit! Only B still with unprocessed values
XVALA = XDONT (JWRKT(IINDA))
End If
!
End Do
End Do
!
! The Cs become As and Bs
!
LMTNA = 2 * LMTNA
End Do
!
Return
!
End Subroutine R_mrgrnk
Subroutine I_mrgrnk (XDONT, IRNGT)
! __________________________________________________________
! MRGRNK = Merge-sort ranking of an array
! For performance reasons, the first 2 passes are taken
! out of the standard loop, and use dedicated coding.
! __________________________________________________________
! __________________________________________________________
Integer, Dimension (:), Intent (In) :: XDONT
Integer, Dimension (:), Intent (Out) :: IRNGT
! __________________________________________________________
Integer :: XVALA, XVALB
!
Integer, Dimension (SIZE(IRNGT)) :: JWRKT
Integer :: LMTNA, LMTNC, IRNG1, IRNG2
Integer :: NVAL, IIND, IWRKD, IWRK, IWRKF, JINDA, IINDA, IINDB
!
NVAL = Min (SIZE(XDONT), SIZE(IRNGT))
Select Case (NVAL)
Case (:0)
Return
Case (1)
IRNGT (1) = 1
Return
Case Default
Continue
End Select
!
! Fill-in the index array, creating ordered couples
!
Do IIND = 2, NVAL, 2
If (XDONT(IIND-1) <= XDONT(IIND)) Then
IRNGT (IIND-1) = IIND - 1
IRNGT (IIND) = IIND
Else
IRNGT (IIND-1) = IIND
IRNGT (IIND) = IIND - 1
End If
End Do
If (Modulo(NVAL, 2) /= 0) Then
IRNGT (NVAL) = NVAL
End If
!
! We will now have ordered subsets A - B - A - B - ...
! and merge A and B couples into C - C - ...
!
LMTNA = 2
LMTNC = 4
!
! First iteration. The length of the ordered subsets goes from 2 to 4
!
Do
If (NVAL <= 2) Exit
!
! Loop on merges of A and B into C
!
Do IWRKD = 0, NVAL - 1, 4
If ((IWRKD+4) > NVAL) Then
If ((IWRKD+2) >= NVAL) Exit
!
! 1 2 3
!
If (XDONT(IRNGT(IWRKD+2)) <= XDONT(IRNGT(IWRKD+3))) Exit
!
! 1 3 2
!
If (XDONT(IRNGT(IWRKD+1)) <= XDONT(IRNGT(IWRKD+3))) Then
IRNG2 = IRNGT (IWRKD+2)
IRNGT (IWRKD+2) = IRNGT (IWRKD+3)
IRNGT (IWRKD+3) = IRNG2
!
! 3 1 2
!
Else
IRNG1 = IRNGT (IWRKD+1)
IRNGT (IWRKD+1) = IRNGT (IWRKD+3)
IRNGT (IWRKD+3) = IRNGT (IWRKD+2)
IRNGT (IWRKD+2) = IRNG1
End If
Exit
End If
!
! 1 2 3 4
!
If (XDONT(IRNGT(IWRKD+2)) <= XDONT(IRNGT(IWRKD+3))) Cycle
!
! 1 3 x x
!
If (XDONT(IRNGT(IWRKD+1)) <= XDONT(IRNGT(IWRKD+3))) Then
IRNG2 = IRNGT (IWRKD+2)
IRNGT (IWRKD+2) = IRNGT (IWRKD+3)
If (XDONT(IRNG2) <= XDONT(IRNGT(IWRKD+4))) Then
! 1 3 2 4
IRNGT (IWRKD+3) = IRNG2
Else
! 1 3 4 2
IRNGT (IWRKD+3) = IRNGT (IWRKD+4)
IRNGT (IWRKD+4) = IRNG2
End If
!
! 3 x x x
!
Else
IRNG1 = IRNGT (IWRKD+1)
IRNG2 = IRNGT (IWRKD+2)
IRNGT (IWRKD+1) = IRNGT (IWRKD+3)
If (XDONT(IRNG1) <= XDONT(IRNGT(IWRKD+4))) Then
IRNGT (IWRKD+2) = IRNG1
If (XDONT(IRNG2) <= XDONT(IRNGT(IWRKD+4))) Then
! 3 1 2 4
IRNGT (IWRKD+3) = IRNG2
Else
! 3 1 4 2
IRNGT (IWRKD+3) = IRNGT (IWRKD+4)
IRNGT (IWRKD+4) = IRNG2
End If
Else
! 3 4 1 2
IRNGT (IWRKD+2) = IRNGT (IWRKD+4)
IRNGT (IWRKD+3) = IRNG1
IRNGT (IWRKD+4) = IRNG2
End If
End If
End Do
!
! The Cs become As and Bs
!
LMTNA = 4
Exit
End Do
!
! Iteration loop. Each time, the length of the ordered subsets
! is doubled.
!
Do
If (LMTNA >= NVAL) Exit
IWRKF = 0
LMTNC = 2 * LMTNC
!
! Loop on merges of A and B into C
!
Do
IWRK = IWRKF
IWRKD = IWRKF + 1
JINDA = IWRKF + LMTNA
IWRKF = IWRKF + LMTNC
If (IWRKF >= NVAL) Then
If (JINDA >= NVAL) Exit
IWRKF = NVAL
End If
IINDA = 1
IINDB = JINDA + 1
!
! Shortcut for the case when the max of A is smaller
! than the min of B. This line may be activated when the
! initial set is already close to sorted.
!
! IF (XDONT(IRNGT(JINDA)) <= XDONT(IRNGT(IINDB))) CYCLE
!
! One steps in the C subset, that we build in the final rank array
!
! Make a copy of the rank array for the merge iteration
!
JWRKT (1:LMTNA) = IRNGT (IWRKD:JINDA)
!
XVALA = XDONT (JWRKT(IINDA))
XVALB = XDONT (IRNGT(IINDB))
!
Do
IWRK = IWRK + 1
!
! We still have unprocessed values in both A and B
!
If (XVALA > XVALB) Then
IRNGT (IWRK) = IRNGT (IINDB)
IINDB = IINDB + 1
If (IINDB > IWRKF) Then
! Only A still with unprocessed values
IRNGT (IWRK+1:IWRKF) = JWRKT (IINDA:LMTNA)
Exit
End If
XVALB = XDONT (IRNGT(IINDB))
Else
IRNGT (IWRK) = JWRKT (IINDA)
IINDA = IINDA + 1
If (IINDA > LMTNA) Exit! Only B still with unprocessed values
XVALA = XDONT (JWRKT(IINDA))
End If
!
End Do
End Do
!
! The Cs become As and Bs
!
LMTNA = 2 * LMTNA
End Do
!
Return
!
End Subroutine I_mrgrnk
end module m_mrgrnk