forked from gcc-mirror/gcc
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathwrite_float.def
1135 lines (1006 loc) · 26.3 KB
/
write_float.def
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
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* Copyright (C) 2007-2021 Free Software Foundation, Inc.
Contributed by Andy Vaught
Write float code factoring to this file by Jerry DeLisle
F2003 I/O support contributed by Jerry DeLisle
This file is part of the GNU Fortran runtime library (libgfortran).
Libgfortran is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
Libgfortran is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "config.h"
typedef enum
{ S_NONE, S_MINUS, S_PLUS }
sign_t;
/* Given a flag that indicates if a value is negative or not, return a
sign_t that gives the sign that we need to produce. */
static sign_t
calculate_sign (st_parameter_dt *dtp, int negative_flag)
{
sign_t s = S_NONE;
if (negative_flag)
s = S_MINUS;
else
switch (dtp->u.p.sign_status)
{
case SIGN_SP: /* Show sign. */
s = S_PLUS;
break;
case SIGN_SS: /* Suppress sign. */
s = S_NONE;
break;
case SIGN_S: /* Processor defined. */
case SIGN_UNSPECIFIED:
s = options.optional_plus ? S_PLUS : S_NONE;
break;
}
return s;
}
/* Determine the precision except for EN format. For G format,
determines an upper bound to be used for sizing the buffer. */
static int
determine_precision (st_parameter_dt * dtp, const fnode * f, int len)
{
int precision = f->u.real.d;
switch (f->format)
{
case FMT_F:
case FMT_G:
precision += dtp->u.p.scale_factor;
break;
case FMT_ES:
/* Scale factor has no effect on output. */
break;
case FMT_E:
case FMT_D:
/* See F2008 10.7.2.3.3.6 */
if (dtp->u.p.scale_factor <= 0)
precision += dtp->u.p.scale_factor - 1;
break;
default:
return -1;
}
/* If the scale factor has a large negative value, we must do our
own rounding? Use ROUND='NEAREST', which should be what snprintf
is using as well. */
if (precision < 0 &&
(dtp->u.p.current_unit->round_status == ROUND_UNSPECIFIED
|| dtp->u.p.current_unit->round_status == ROUND_PROCDEFINED))
dtp->u.p.current_unit->round_status = ROUND_NEAREST;
/* Add extra guard digits up to at least full precision when we do
our own rounding. */
if (dtp->u.p.current_unit->round_status != ROUND_UNSPECIFIED
&& dtp->u.p.current_unit->round_status != ROUND_PROCDEFINED)
{
precision += 2 * len + 4;
if (precision < 0)
precision = 0;
}
return precision;
}
/* Build a real number according to its format which is FMT_G free. */
static void
build_float_string (st_parameter_dt *dtp, const fnode *f, char *buffer,
size_t size, int nprinted, int precision, int sign_bit,
bool zero_flag, int npad, int default_width, char *result,
size_t *len)
{
char *put;
char *digits;
int e, w, d, p, i;
char expchar, rchar;
format_token ft;
/* Number of digits before the decimal point. */
int nbefore;
/* Number of zeros after the decimal point. */
int nzero;
/* Number of digits after the decimal point. */
int nafter;
int leadzero;
int nblanks;
int ndigits, edigits;
sign_t sign;
ft = f->format;
if (f->u.real.w == DEFAULT_WIDTH)
/* This codepath can only be reached with -fdec-format-defaults. */
{
w = default_width;
d = precision;
}
else
{
w = f->u.real.w;
d = f->u.real.d;
}
p = dtp->u.p.scale_factor;
*len = 0;
rchar = '5';
/* We should always know the field width and precision. */
if (d < 0)
internal_error (&dtp->common, "Unspecified precision");
sign = calculate_sign (dtp, sign_bit);
/* Calculate total number of digits. */
if (ft == FMT_F)
ndigits = nprinted - 2;
else
ndigits = precision + 1;
/* Read the exponent back in. */
if (ft != FMT_F)
e = atoi (&buffer[ndigits + 3]) + 1;
else
e = 0;
/* Make sure zero comes out as 0.0e0. */
if (zero_flag)
e = 0;
/* Normalize the fractional component. */
if (ft != FMT_F)
{
buffer[2] = buffer[1];
digits = &buffer[2];
}
else
digits = &buffer[1];
/* Figure out where to place the decimal point. */
switch (ft)
{
case FMT_F:
nbefore = ndigits - precision;
if ((w > 0) && (nbefore > (int) size))
{
*len = w;
star_fill (result, w);
result[w] = '\0';
return;
}
/* Make sure the decimal point is a '.'; depending on the
locale, this might not be the case otherwise. */
digits[nbefore] = '.';
if (p != 0)
{
if (p > 0)
{
memmove (digits + nbefore, digits + nbefore + 1, p);
digits[nbefore + p] = '.';
nbefore += p;
nafter = d;
nzero = 0;
}
else /* p < 0 */
{
if (nbefore + p >= 0)
{
nzero = 0;
memmove (digits + nbefore + p + 1, digits + nbefore + p, -p);
nbefore += p;
digits[nbefore] = '.';
nafter = d;
}
else
{
nzero = -(nbefore + p);
memmove (digits + 1, digits, nbefore);
nafter = d - nzero;
if (nafter == 0 && d > 0)
{
/* This is needed to get the correct rounding. */
memmove (digits + 1, digits, ndigits - 1);
digits[1] = '0';
nafter = 1;
nzero = d - 1;
}
else if (nafter < 0)
{
/* Reset digits to 0 in order to get correct rounding
towards infinity. */
for (i = 0; i < ndigits; i++)
digits[i] = '0';
digits[ndigits - 1] = '1';
nafter = d;
nzero = 0;
}
nbefore = 0;
}
}
}
else
{
nzero = 0;
nafter = d;
}
while (digits[0] == '0' && nbefore > 0)
{
digits++;
nbefore--;
ndigits--;
}
expchar = 0;
/* If we need to do rounding ourselves, get rid of the dot by
moving the fractional part. */
if (dtp->u.p.current_unit->round_status != ROUND_UNSPECIFIED
&& dtp->u.p.current_unit->round_status != ROUND_PROCDEFINED)
memmove (digits + nbefore, digits + nbefore + 1, ndigits - nbefore);
break;
case FMT_E:
case FMT_D:
i = dtp->u.p.scale_factor;
if (d < 0 && p == 0)
{
generate_error (&dtp->common, LIBERROR_FORMAT, "Precision not "
"greater than zero in format specifier 'E' or 'D'");
return;
}
if (p <= -d || p >= d + 2)
{
generate_error (&dtp->common, LIBERROR_FORMAT, "Scale factor "
"out of range in format specifier 'E' or 'D'");
return;
}
if (!zero_flag)
e -= p;
if (p < 0)
{
nbefore = 0;
nzero = -p;
nafter = d + p;
}
else if (p > 0)
{
nbefore = p;
nzero = 0;
nafter = (d - p) + 1;
}
else /* p == 0 */
{
nbefore = 0;
nzero = 0;
nafter = d;
}
if (ft == FMT_E)
expchar = 'E';
else
expchar = 'D';
break;
case FMT_EN:
/* The exponent must be a multiple of three, with 1-3 digits before
the decimal point. */
if (!zero_flag)
e--;
if (e >= 0)
nbefore = e % 3;
else
{
nbefore = (-e) % 3;
if (nbefore != 0)
nbefore = 3 - nbefore;
}
e -= nbefore;
nbefore++;
nzero = 0;
nafter = d;
expchar = 'E';
break;
case FMT_ES:
if (!zero_flag)
e--;
nbefore = 1;
nzero = 0;
nafter = d;
expchar = 'E';
break;
default:
/* Should never happen. */
internal_error (&dtp->common, "Unexpected format token");
}
if (zero_flag)
goto skip;
/* Round the value. The value being rounded is an unsigned magnitude. */
switch (dtp->u.p.current_unit->round_status)
{
/* For processor defined and unspecified rounding we use
snprintf to print the exact number of digits needed, and thus
let snprintf handle the rounding. On system claiming support
for IEEE 754, this ought to be round to nearest, ties to
even, corresponding to the Fortran ROUND='NEAREST'. */
case ROUND_PROCDEFINED:
case ROUND_UNSPECIFIED:
case ROUND_ZERO: /* Do nothing and truncation occurs. */
goto skip;
case ROUND_UP:
if (sign_bit)
goto skip;
goto updown;
case ROUND_DOWN:
if (!sign_bit)
goto skip;
goto updown;
case ROUND_NEAREST:
/* Round compatible unless there is a tie. A tie is a 5 with
all trailing zero's. */
i = nafter + nbefore;
if (digits[i] == '5')
{
for(i++ ; i < ndigits; i++)
{
if (digits[i] != '0')
goto do_rnd;
}
/* It is a tie so round to even. */
switch (digits[nafter + nbefore - 1])
{
case '1':
case '3':
case '5':
case '7':
case '9':
/* If odd, round away from zero to even. */
break;
default:
/* If even, skip rounding, truncate to even. */
goto skip;
}
}
/* Fall through. */
/* The ROUND_COMPATIBLE is rounding away from zero when there is a tie. */
case ROUND_COMPATIBLE:
rchar = '5';
goto do_rnd;
}
updown:
rchar = '0';
/* Do not reset nbefore for FMT_F and FMT_EN. */
if (ft != FMT_F && ft !=FMT_EN && w > 0 && d == 0 && p == 0)
nbefore = 1;
/* Scan for trailing zeros to see if we really need to round it. */
for(i = nbefore + nafter; i < ndigits; i++)
{
if (digits[i] != '0')
goto do_rnd;
}
goto skip;
do_rnd:
if (nbefore + nafter == 0)
/* Handle the case Fw.0 and value < 1.0 */
{
ndigits = 0;
if (digits[0] >= rchar)
{
/* We rounded to zero but shouldn't have */
nbefore = 1;
digits--;
digits[0] = '1';
ndigits = 1;
}
}
else if (nbefore + nafter < ndigits)
{
i = ndigits = nbefore + nafter;
if (digits[i] >= rchar)
{
/* Propagate the carry. */
for (i--; i >= 0; i--)
{
if (digits[i] != '9')
{
digits[i]++;
break;
}
digits[i] = '0';
}
if (i < 0)
{
/* The carry overflowed. Fortunately we have some spare
space at the start of the buffer. We may discard some
digits, but this is ok because we already know they are
zero. */
digits--;
digits[0] = '1';
if (ft == FMT_F)
{
if (nzero > 0)
{
nzero--;
nafter++;
}
else
nbefore++;
}
else if (ft == FMT_EN)
{
nbefore++;
if (nbefore == 4)
{
nbefore = 1;
e += 3;
}
}
else
e++;
}
}
}
skip:
/* Calculate the format of the exponent field. */
if (expchar && !(dtp->u.p.g0_no_blanks && e == 0))
{
edigits = 1;
for (i = abs (e); i >= 10; i /= 10)
edigits++;
if (f->u.real.e < 0)
{
/* Width not specified. Must be no more than 3 digits. */
if (e > 999 || e < -999)
edigits = -1;
else
{
edigits = 4;
if (e > 99 || e < -99)
expchar = ' ';
}
}
else if (f->u.real.e == 0)
{
/* Zero width specified, no leading zeros in exponent */
if (e > 999 || e < -999)
edigits = 6;
else if (e > 99 || e < -99)
edigits = 5;
else if (e > 9 || e < -9)
edigits = 4;
else
edigits = 3;
}
else
{
/* Exponent width specified, check it is wide enough. */
if (edigits > f->u.real.e)
edigits = -1;
else
edigits = f->u.real.e + 2;
}
}
else
edigits = 0;
/* Scan the digits string and count the number of zeros. If we make it
all the way through the loop, we know the value is zero after the
rounding completed above. */
int hasdot = 0;
for (i = 0; i < ndigits + hasdot; i++)
{
if (digits[i] == '.')
hasdot = 1;
else if (digits[i] != '0')
break;
}
/* To format properly, we need to know if the rounded result is zero and if
so, we set the zero_flag which may have been already set for
actual zero. */
if (i == ndigits + hasdot)
{
zero_flag = true;
/* The output is zero, so set the sign according to the sign bit unless
-fno-sign-zero was specified. */
if (compile_options.sign_zero == 1)
sign = calculate_sign (dtp, sign_bit);
else
sign = calculate_sign (dtp, 0);
}
/* Pick a field size if none was specified, taking into account small
values that may have been rounded to zero. */
if (w <= 0)
{
if (zero_flag)
w = d + (sign != S_NONE ? 2 : 1) + (d == 0 ? 1 : 0);
else
{
w = nbefore + nzero + nafter + (sign != S_NONE ? 2 : 1);
w = w == 1 ? 2 : w;
}
}
/* Work out how much padding is needed. */
nblanks = w - (nbefore + nzero + nafter + edigits + 1);
if (sign != S_NONE)
nblanks--;
/* See if we have space for a zero before the decimal point. */
if (nbefore == 0 && nblanks > 0)
{
leadzero = 1;
nblanks--;
}
else
leadzero = 0;
if (dtp->u.p.g0_no_blanks)
{
w -= nblanks;
nblanks = 0;
}
/* Create the final float string. */
*len = w + npad;
put = result;
/* Check the value fits in the specified field width. */
if (nblanks < 0 || edigits == -1 || w == 1 || (w == 2 && sign != S_NONE))
{
star_fill (put, *len);
return;
}
/* Pad to full field width. */
if ( ( nblanks > 0 ) && !dtp->u.p.no_leading_blank)
{
memset (put, ' ', nblanks);
put += nblanks;
}
/* Set the initial sign (if any). */
if (sign == S_PLUS)
*(put++) = '+';
else if (sign == S_MINUS)
*(put++) = '-';
/* Set an optional leading zero. */
if (leadzero)
*(put++) = '0';
/* Set the part before the decimal point, padding with zeros. */
if (nbefore > 0)
{
if (nbefore > ndigits)
{
i = ndigits;
memcpy (put, digits, i);
ndigits = 0;
while (i < nbefore)
put[i++] = '0';
}
else
{
i = nbefore;
memcpy (put, digits, i);
ndigits -= i;
}
digits += i;
put += nbefore;
}
/* Set the decimal point. */
*(put++) = dtp->u.p.current_unit->decimal_status == DECIMAL_POINT ? '.' : ',';
if (ft == FMT_F
&& (dtp->u.p.current_unit->round_status == ROUND_UNSPECIFIED
|| dtp->u.p.current_unit->round_status == ROUND_PROCDEFINED))
digits++;
/* Set leading zeros after the decimal point. */
if (nzero > 0)
{
for (i = 0; i < nzero; i++)
*(put++) = '0';
}
/* Set digits after the decimal point, padding with zeros. */
if (ndigits >= 0 && nafter > 0)
{
if (nafter > ndigits)
i = ndigits;
else
i = nafter;
if (i > 0)
memcpy (put, digits, i);
while (i < nafter)
put[i++] = '0';
digits += i;
ndigits -= i;
put += nafter;
}
/* Set the exponent. */
if (expchar && !(dtp->u.p.g0_no_blanks && e == 0))
{
if (expchar != ' ')
{
*(put++) = expchar;
edigits--;
}
snprintf (buffer, size, "%+0*d", edigits, e);
memcpy (put, buffer, edigits);
put += edigits;
}
if (dtp->u.p.no_leading_blank)
{
memset (put , ' ' , nblanks);
dtp->u.p.no_leading_blank = 0;
put += nblanks;
}
if (npad > 0 && !dtp->u.p.g0_no_blanks)
{
memset (put , ' ' , npad);
put += npad;
}
/* NULL terminate the string. */
*put = '\0';
return;
}
/* Write "Infinite" or "Nan" as appropriate for the given format. */
static void
build_infnan_string (st_parameter_dt *dtp, const fnode *f, int isnan_flag,
int sign_bit, char *p, size_t *len)
{
char fin;
int nb = 0;
sign_t sign;
int mark;
if (f->format != FMT_B && f->format != FMT_O && f->format != FMT_Z)
{
sign = calculate_sign (dtp, sign_bit);
mark = (sign == S_PLUS || sign == S_MINUS) ? 8 : 7;
nb = f->u.real.w;
*len = nb;
/* If the field width is zero, the processor must select a width
not zero. 4 is chosen to allow output of '-Inf' or '+Inf' */
if ((nb == 0) || dtp->u.p.g0_no_blanks)
{
if (isnan_flag)
nb = 3;
else
nb = (sign == S_PLUS || sign == S_MINUS) ? 4 : 3;
*len = nb;
}
p[*len] = '\0';
if (nb < 3)
{
memset (p, '*', nb);
return;
}
memset(p, ' ', nb);
if (!isnan_flag)
{
if (sign_bit)
{
/* If the sign is negative and the width is 3, there is
insufficient room to output '-Inf', so output asterisks */
if (nb == 3)
{
memset (p, '*', nb);
return;
}
/* The negative sign is mandatory */
fin = '-';
}
else
/* The positive sign is optional, but we output it for
consistency */
fin = '+';
if (nb > mark)
/* We have room, so output 'Infinity' */
memcpy(p + nb - 8, "Infinity", 8);
else
/* For the case of width equals 8, there is not enough room
for the sign and 'Infinity' so we go with 'Inf' */
memcpy(p + nb - 3, "Inf", 3);
if (sign == S_PLUS || sign == S_MINUS)
{
if (nb < 9 && nb > 3)
p[nb - 4] = fin; /* Put the sign in front of Inf */
else if (nb > 8)
p[nb - 9] = fin; /* Put the sign in front of Infinity */
}
}
else
memcpy(p + nb - 3, "NaN", 3);
}
}
/* Returns the value of 10**d. */
#define CALCULATE_EXP(x) \
static GFC_REAL_ ## x \
calculate_exp_ ## x (int d)\
{\
int i;\
GFC_REAL_ ## x r = 1.0;\
for (i = 0; i< (d >= 0 ? d : -d); i++)\
r *= 10;\
r = (d >= 0) ? r : 1.0 / r;\
return r;\
}
CALCULATE_EXP(4)
CALCULATE_EXP(8)
#ifdef HAVE_GFC_REAL_10
CALCULATE_EXP(10)
#endif
#ifdef HAVE_GFC_REAL_16
CALCULATE_EXP(16)
#endif
#undef CALCULATE_EXP
/* Define macros to build code for format_float. */
/* Note: Before output_float is called, snprintf is used to print to buffer the
number in the format +D.DDDDe+ddd.
# The result will always contain a decimal point, even if no
digits follow it
- The converted value is to be left adjusted on the field boundary
+ A sign (+ or -) always be placed before a number
* prec is used as the precision
e format: [-]d.ddde±dd where there is one digit before the
decimal-point character and the number of digits after it is
equal to the precision. The exponent always contains at least two
digits; if the value is zero, the exponent is 00. */
#define TOKENPASTE(x, y) TOKENPASTE2(x, y)
#define TOKENPASTE2(x, y) x ## y
#define DTOA(suff,prec,val) TOKENPASTE(DTOA2,suff)(prec,val)
#define DTOA2(prec,val) \
snprintf (buffer, size, "%+-#.*e", (prec), (val))
#define DTOA2L(prec,val) \
snprintf (buffer, size, "%+-#.*Le", (prec), (val))
#if defined(GFC_REAL_16_IS_FLOAT128)
#define DTOA2Q(prec,val) \
quadmath_snprintf (buffer, size, "%+-#.*Qe", (prec), (val))
#endif
#define FDTOA(suff,prec,val) TOKENPASTE(FDTOA2,suff)(prec,val)
/* For F format, we print to the buffer with f format. */
#define FDTOA2(prec,val) \
snprintf (buffer, size, "%+-#.*f", (prec), (val))
#define FDTOA2L(prec,val) \
snprintf (buffer, size, "%+-#.*Lf", (prec), (val))
#if defined(GFC_REAL_16_IS_FLOAT128)
#define FDTOA2Q(prec,val) \
quadmath_snprintf (buffer, size, "%+-#.*Qf", \
(prec), (val))
#endif
/* EN format is tricky since the number of significant digits depends
on the magnitude. Solve it by first printing a temporary value and
figure out the number of significant digits from the printed
exponent. Values y, 0.95*10.0**e <= y <10.0**e, are rounded to
10.0**e even when the final result will not be rounded to 10.0**e.
For these values the exponent returned by atoi has to be decremented
by one. The values y in the ranges
(1000.0-0.5*10.0**(-d))*10.0**(3*n) <= y < 10.0*(3*(n+1))
(100.0-0.5*10.0**(-d))*10.0**(3*n) <= y < 10.0*(3*n+2)
(10.0-0.5*10.0**(-d))*10.0**(3*n) <= y < 10.0*(3*n+1)
are correctly rounded respectively to 1.0...0*10.0*(3*(n+1)),
100.0...0*10.0*(3*n), and 10.0...0*10.0*(3*n), where 0...0
represents d zeroes, by the lines 279 to 297. */
#define EN_PREC(x,y)\
{\
volatile GFC_REAL_ ## x tmp, one = 1.0;\
tmp = * (GFC_REAL_ ## x *)source;\
if (isfinite (tmp))\
{\
nprinted = DTOA(y,0,tmp);\
int e = atoi (&buffer[4]);\
if (buffer[1] == '1')\
{\
tmp = (calculate_exp_ ## x (-e)) * tmp;\
tmp = one - (tmp < 0 ? -tmp : tmp);\
if (tmp > 0)\
e = e - 1;\
}\
nbefore = e%3;\
if (nbefore < 0)\
nbefore = 3 + nbefore;\
}\
else\
nprinted = -1;\
}\
static int
determine_en_precision (st_parameter_dt *dtp, const fnode *f,
const char *source, int len)
{
int nprinted;
char buffer[10];
const size_t size = 10;
int nbefore; /* digits before decimal point - 1. */
switch (len)
{
case 4:
EN_PREC(4,)
break;
case 8:
EN_PREC(8,)
break;
#ifdef HAVE_GFC_REAL_10
case 10:
EN_PREC(10,L)
break;
#endif
#ifdef HAVE_GFC_REAL_16
case 16:
# ifdef GFC_REAL_16_IS_FLOAT128
EN_PREC(16,Q)
# else
EN_PREC(16,L)
# endif
break;
#endif
default:
internal_error (NULL, "bad real kind");
}
if (nprinted == -1)
return -1;
int prec = f->u.real.d + nbefore;
if (dtp->u.p.current_unit->round_status != ROUND_UNSPECIFIED
&& dtp->u.p.current_unit->round_status != ROUND_PROCDEFINED)
prec += 2 * len + 4;
return prec;
}
/* Generate corresponding I/O format. and output.
The rules to translate FMT_G to FMT_E or FMT_F from DEC fortran
LRM (table 11-2, Chapter 11, "I/O Formatting", P11-25) is:
Data Magnitude Equivalent Conversion
0< m < 0.1-0.5*10**(-d-1) Ew.d[Ee]
m = 0 F(w-n).(d-1), n' '
0.1-0.5*10**(-d-1)<= m < 1-0.5*10**(-d) F(w-n).d, n' '
1-0.5*10**(-d)<= m < 10-0.5*10**(-d+1) F(w-n).(d-1), n' '
10-0.5*10**(-d+1)<= m < 100-0.5*10**(-d+2) F(w-n).(d-2), n' '
................ ..........
10**(d-1)-0.5*10**(-1)<= m <10**d-0.5 F(w-n).0,n(' ')
m >= 10**d-0.5 Ew.d[Ee]
notes: for Gw.d , n' ' means 4 blanks
for Gw.dEe, n' ' means e+2 blanks
for rounding modes adjustment, r, See Fortran F2008 10.7.5.2.2
the asm volatile is required for 32-bit x86 platforms. */
#define FORMAT_FLOAT(x,y)\
{\
int npad = 0;\
GFC_REAL_ ## x m;\
m = * (GFC_REAL_ ## x *)source;\
sign_bit = signbit (m);\
if (!isfinite (m))\
{ \
build_infnan_string (dtp, f, isnan (m), sign_bit, result, res_len);\
return;\
}\
m = sign_bit ? -m : m;\
zero_flag = (m == 0.0);\
if (f->format == FMT_G)\
{\
int e = f->u.real.e;\
int d = f->u.real.d;\
int w = f->u.real.w;\
fnode newf;\
GFC_REAL_ ## x exp_d, r = 0.5, r_sc;\
int low, high, mid;\
int ubound, lbound;\
int save_scale_factor;\
volatile GFC_REAL_ ## x temp;\
save_scale_factor = dtp->u.p.scale_factor;\
if (w == DEFAULT_WIDTH)\
{\
w = default_width;\
d = precision;\
}\
/* The switch between FMT_E and FMT_F is based on the absolute value. \
Set r=0 for rounding toward zero and r = 1 otherwise. \
If (exp_d - m) == 1 there is no rounding needed. */\
switch (dtp->u.p.current_unit->round_status)\
{\
case ROUND_ZERO:\
r = 0.0;\
break;\
case ROUND_UP:\
r = sign_bit ? 0.0 : 1.0;\