1 /* Simplify intrinsic functions at compile-time.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
3 Free Software Foundation, Inc.
4 Contributed by Andy Vaught & Katherine Holcomb
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
27 #include "intrinsic.h"
28 #include "target-memory.h"
30 gfc_expr gfc_bad_expr;
33 /* Note that 'simplification' is not just transforming expressions.
34 For functions that are not simplified at compile time, range
35 checking is done if possible.
37 The return convention is that each simplification function returns:
39 A new expression node corresponding to the simplified arguments.
40 The original arguments are destroyed by the caller, and must not
41 be a part of the new expression.
43 NULL pointer indicating that no simplification was possible and
44 the original expression should remain intact. If the
45 simplification function sets the type and/or the function name
46 via the pointer gfc_simple_expression, then this type is
49 An expression pointer to gfc_bad_expr (a static placeholder)
50 indicating that some error has prevented simplification. For
51 example, sqrt(-1.0). The error is generated within the function
52 and should be propagated upwards
54 By the time a simplification function gets control, it has been
55 decided that the function call is really supposed to be the
56 intrinsic. No type checking is strictly necessary, since only
57 valid types will be passed on. On the other hand, a simplification
58 subroutine may have to look at the type of an argument as part of
61 Array arguments are never passed to these subroutines.
63 The functions in this file don't have much comment with them, but
64 everything is reasonably straight-forward. The Standard, chapter 13
65 is the best comment you'll find for this file anyway. */
67 /* Range checks an expression node. If all goes well, returns the
68 node, otherwise returns &gfc_bad_expr and frees the node. */
71 range_check (gfc_expr *result, const char *name)
76 switch (gfc_range_check (result))
82 gfc_error ("Result of %s overflows its kind at %L", name,
87 gfc_error ("Result of %s underflows its kind at %L", name,
92 gfc_error ("Result of %s is NaN at %L", name, &result->where);
96 gfc_error ("Result of %s gives range error for its kind at %L", name,
101 gfc_free_expr (result);
102 return &gfc_bad_expr;
106 /* A helper function that gets an optional and possibly missing
107 kind parameter. Returns the kind, -1 if something went wrong. */
110 get_kind (bt type, gfc_expr *k, const char *name, int default_kind)
117 if (k->expr_type != EXPR_CONSTANT)
119 gfc_error ("KIND parameter of %s at %L must be an initialization "
120 "expression", name, &k->where);
124 if (gfc_extract_int (k, &kind) != NULL
125 || gfc_validate_kind (type, kind, true) < 0)
127 gfc_error ("Invalid KIND parameter of %s at %L", name, &k->where);
135 /* Helper function to get an integer constant with a kind number given
136 by an integer constant expression. */
138 int_expr_with_kind (int i, gfc_expr *kind, const char *name)
140 gfc_expr *res = gfc_int_expr (i);
141 res->ts.kind = get_kind (BT_INTEGER, kind, name, gfc_default_integer_kind);
142 if (res->ts.kind == -1)
149 /* Converts an mpz_t signed variable into an unsigned one, assuming
150 two's complement representations and a binary width of bitsize.
151 The conversion is a no-op unless x is negative; otherwise, it can
152 be accomplished by masking out the high bits. */
155 convert_mpz_to_unsigned (mpz_t x, int bitsize)
161 /* Confirm that no bits above the signed range are unset. */
162 gcc_assert (mpz_scan0 (x, bitsize-1) == ULONG_MAX);
164 mpz_init_set_ui (mask, 1);
165 mpz_mul_2exp (mask, mask, bitsize);
166 mpz_sub_ui (mask, mask, 1);
168 mpz_and (x, x, mask);
174 /* Confirm that no bits above the signed range are set. */
175 gcc_assert (mpz_scan1 (x, bitsize-1) == ULONG_MAX);
180 /* Converts an mpz_t unsigned variable into a signed one, assuming
181 two's complement representations and a binary width of bitsize.
182 If the bitsize-1 bit is set, this is taken as a sign bit and
183 the number is converted to the corresponding negative number. */
186 convert_mpz_to_signed (mpz_t x, int bitsize)
190 /* Confirm that no bits above the unsigned range are set. */
191 gcc_assert (mpz_scan1 (x, bitsize) == ULONG_MAX);
193 if (mpz_tstbit (x, bitsize - 1) == 1)
195 mpz_init_set_ui (mask, 1);
196 mpz_mul_2exp (mask, mask, bitsize);
197 mpz_sub_ui (mask, mask, 1);
199 /* We negate the number by hand, zeroing the high bits, that is
200 make it the corresponding positive number, and then have it
201 negated by GMP, giving the correct representation of the
204 mpz_add_ui (x, x, 1);
205 mpz_and (x, x, mask);
214 /********************** Simplification functions *****************************/
217 gfc_simplify_abs (gfc_expr *e)
221 if (e->expr_type != EXPR_CONSTANT)
227 result = gfc_constant_result (BT_INTEGER, e->ts.kind, &e->where);
229 mpz_abs (result->value.integer, e->value.integer);
231 result = range_check (result, "IABS");
235 result = gfc_constant_result (BT_REAL, e->ts.kind, &e->where);
237 mpfr_abs (result->value.real, e->value.real, GFC_RND_MODE);
239 result = range_check (result, "ABS");
243 result = gfc_constant_result (BT_REAL, e->ts.kind, &e->where);
245 gfc_set_model_kind (e->ts.kind);
247 mpfr_hypot (result->value.real, e->value.complex.r,
248 e->value.complex.i, GFC_RND_MODE);
249 result = range_check (result, "CABS");
253 gfc_internal_error ("gfc_simplify_abs(): Bad type");
259 /* We use the processor's collating sequence, because all
260 systems that gfortran currently works on are ASCII. */
263 gfc_simplify_achar (gfc_expr *e, gfc_expr *k)
269 if (e->expr_type != EXPR_CONSTANT)
272 kind = get_kind (BT_CHARACTER, k, "ACHAR", gfc_default_character_kind);
274 return &gfc_bad_expr;
276 ch = gfc_extract_int (e, &c);
279 gfc_internal_error ("gfc_simplify_achar: %s", ch);
281 if (gfc_option.warn_surprising && (c < 0 || c > 127))
282 gfc_warning ("Argument of ACHAR function at %L outside of range [0,127]",
285 result = gfc_constant_result (BT_CHARACTER, kind, &e->where);
287 result->value.character.string = gfc_getmem (2);
289 result->value.character.length = 1;
290 result->value.character.string[0] = c;
291 result->value.character.string[1] = '\0'; /* For debugger */
297 gfc_simplify_acos (gfc_expr *x)
301 if (x->expr_type != EXPR_CONSTANT)
304 if (mpfr_cmp_si (x->value.real, 1) > 0
305 || mpfr_cmp_si (x->value.real, -1) < 0)
307 gfc_error ("Argument of ACOS at %L must be between -1 and 1",
309 return &gfc_bad_expr;
312 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
314 mpfr_acos (result->value.real, x->value.real, GFC_RND_MODE);
316 return range_check (result, "ACOS");
320 gfc_simplify_acosh (gfc_expr *x)
324 if (x->expr_type != EXPR_CONSTANT)
327 if (mpfr_cmp_si (x->value.real, 1) < 0)
329 gfc_error ("Argument of ACOSH at %L must not be less than 1",
331 return &gfc_bad_expr;
334 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
336 mpfr_acosh (result->value.real, x->value.real, GFC_RND_MODE);
338 return range_check (result, "ACOSH");
342 gfc_simplify_adjustl (gfc_expr *e)
348 if (e->expr_type != EXPR_CONSTANT)
351 len = e->value.character.length;
353 result = gfc_constant_result (BT_CHARACTER, e->ts.kind, &e->where);
355 result->value.character.length = len;
356 result->value.character.string = gfc_getmem (len + 1);
358 for (count = 0, i = 0; i < len; ++i)
360 ch = e->value.character.string[i];
366 for (i = 0; i < len - count; ++i)
367 result->value.character.string[i] = e->value.character.string[count + i];
369 for (i = len - count; i < len; ++i)
370 result->value.character.string[i] = ' ';
372 result->value.character.string[len] = '\0'; /* For debugger */
379 gfc_simplify_adjustr (gfc_expr *e)
385 if (e->expr_type != EXPR_CONSTANT)
388 len = e->value.character.length;
390 result = gfc_constant_result (BT_CHARACTER, e->ts.kind, &e->where);
392 result->value.character.length = len;
393 result->value.character.string = gfc_getmem (len + 1);
395 for (count = 0, i = len - 1; i >= 0; --i)
397 ch = e->value.character.string[i];
403 for (i = 0; i < count; ++i)
404 result->value.character.string[i] = ' ';
406 for (i = count; i < len; ++i)
407 result->value.character.string[i] = e->value.character.string[i - count];
409 result->value.character.string[len] = '\0'; /* For debugger */
416 gfc_simplify_aimag (gfc_expr *e)
420 if (e->expr_type != EXPR_CONSTANT)
423 result = gfc_constant_result (BT_REAL, e->ts.kind, &e->where);
424 mpfr_set (result->value.real, e->value.complex.i, GFC_RND_MODE);
426 return range_check (result, "AIMAG");
431 gfc_simplify_aint (gfc_expr *e, gfc_expr *k)
433 gfc_expr *rtrunc, *result;
436 kind = get_kind (BT_REAL, k, "AINT", e->ts.kind);
438 return &gfc_bad_expr;
440 if (e->expr_type != EXPR_CONSTANT)
443 rtrunc = gfc_copy_expr (e);
445 mpfr_trunc (rtrunc->value.real, e->value.real);
447 result = gfc_real2real (rtrunc, kind);
448 gfc_free_expr (rtrunc);
450 return range_check (result, "AINT");
455 gfc_simplify_dint (gfc_expr *e)
457 gfc_expr *rtrunc, *result;
459 if (e->expr_type != EXPR_CONSTANT)
462 rtrunc = gfc_copy_expr (e);
464 mpfr_trunc (rtrunc->value.real, e->value.real);
466 result = gfc_real2real (rtrunc, gfc_default_double_kind);
467 gfc_free_expr (rtrunc);
469 return range_check (result, "DINT");
474 gfc_simplify_anint (gfc_expr *e, gfc_expr *k)
479 kind = get_kind (BT_REAL, k, "ANINT", e->ts.kind);
481 return &gfc_bad_expr;
483 if (e->expr_type != EXPR_CONSTANT)
486 result = gfc_constant_result (e->ts.type, kind, &e->where);
488 mpfr_round (result->value.real, e->value.real);
490 return range_check (result, "ANINT");
495 gfc_simplify_and (gfc_expr *x, gfc_expr *y)
500 if (x->expr_type != EXPR_CONSTANT || y->expr_type != EXPR_CONSTANT)
503 kind = x->ts.kind > y->ts.kind ? x->ts.kind : y->ts.kind;
504 if (x->ts.type == BT_INTEGER)
506 result = gfc_constant_result (BT_INTEGER, kind, &x->where);
507 mpz_and (result->value.integer, x->value.integer, y->value.integer);
509 else /* BT_LOGICAL */
511 result = gfc_constant_result (BT_LOGICAL, kind, &x->where);
512 result->value.logical = x->value.logical && y->value.logical;
515 return range_check (result, "AND");
520 gfc_simplify_dnint (gfc_expr *e)
524 if (e->expr_type != EXPR_CONSTANT)
527 result = gfc_constant_result (BT_REAL, gfc_default_double_kind, &e->where);
529 mpfr_round (result->value.real, e->value.real);
531 return range_check (result, "DNINT");
536 gfc_simplify_asin (gfc_expr *x)
540 if (x->expr_type != EXPR_CONSTANT)
543 if (mpfr_cmp_si (x->value.real, 1) > 0
544 || mpfr_cmp_si (x->value.real, -1) < 0)
546 gfc_error ("Argument of ASIN at %L must be between -1 and 1",
548 return &gfc_bad_expr;
551 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
553 mpfr_asin (result->value.real, x->value.real, GFC_RND_MODE);
555 return range_check (result, "ASIN");
560 gfc_simplify_asinh (gfc_expr *x)
564 if (x->expr_type != EXPR_CONSTANT)
567 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
569 mpfr_asinh (result->value.real, x->value.real, GFC_RND_MODE);
571 return range_check (result, "ASINH");
576 gfc_simplify_atan (gfc_expr *x)
580 if (x->expr_type != EXPR_CONSTANT)
583 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
585 mpfr_atan (result->value.real, x->value.real, GFC_RND_MODE);
587 return range_check (result, "ATAN");
592 gfc_simplify_atanh (gfc_expr *x)
596 if (x->expr_type != EXPR_CONSTANT)
599 if (mpfr_cmp_si (x->value.real, 1) >= 0
600 || mpfr_cmp_si (x->value.real, -1) <= 0)
602 gfc_error ("Argument of ATANH at %L must be inside the range -1 to 1",
604 return &gfc_bad_expr;
607 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
609 mpfr_atanh (result->value.real, x->value.real, GFC_RND_MODE);
611 return range_check (result, "ATANH");
616 gfc_simplify_atan2 (gfc_expr *y, gfc_expr *x)
620 if (x->expr_type != EXPR_CONSTANT || y->expr_type != EXPR_CONSTANT)
623 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
625 if (mpfr_sgn (y->value.real) == 0 && mpfr_sgn (x->value.real) == 0)
627 gfc_error ("If first argument of ATAN2 %L is zero, then the "
628 "second argument must not be zero", &x->where);
629 gfc_free_expr (result);
630 return &gfc_bad_expr;
633 mpfr_atan2 (result->value.real, y->value.real, x->value.real, GFC_RND_MODE);
635 return range_check (result, "ATAN2");
640 gfc_simplify_bit_size (gfc_expr *e)
645 i = gfc_validate_kind (e->ts.type, e->ts.kind, false);
646 result = gfc_constant_result (BT_INTEGER, e->ts.kind, &e->where);
647 mpz_set_ui (result->value.integer, gfc_integer_kinds[i].bit_size);
654 gfc_simplify_btest (gfc_expr *e, gfc_expr *bit)
658 if (e->expr_type != EXPR_CONSTANT || bit->expr_type != EXPR_CONSTANT)
661 if (gfc_extract_int (bit, &b) != NULL || b < 0)
662 return gfc_logical_expr (0, &e->where);
664 return gfc_logical_expr (mpz_tstbit (e->value.integer, b), &e->where);
669 gfc_simplify_ceiling (gfc_expr *e, gfc_expr *k)
671 gfc_expr *ceil, *result;
674 kind = get_kind (BT_INTEGER, k, "CEILING", gfc_default_integer_kind);
676 return &gfc_bad_expr;
678 if (e->expr_type != EXPR_CONSTANT)
681 result = gfc_constant_result (BT_INTEGER, kind, &e->where);
683 ceil = gfc_copy_expr (e);
685 mpfr_ceil (ceil->value.real, e->value.real);
686 gfc_mpfr_to_mpz (result->value.integer, ceil->value.real);
688 gfc_free_expr (ceil);
690 return range_check (result, "CEILING");
695 gfc_simplify_char (gfc_expr *e, gfc_expr *k)
701 kind = get_kind (BT_CHARACTER, k, "CHAR", gfc_default_character_kind);
703 return &gfc_bad_expr;
705 if (e->expr_type != EXPR_CONSTANT)
708 ch = gfc_extract_int (e, &c);
711 gfc_internal_error ("gfc_simplify_char: %s", ch);
713 if (c < 0 || c > UCHAR_MAX)
714 gfc_error ("Argument of CHAR function at %L outside of range [0,255]",
717 result = gfc_constant_result (BT_CHARACTER, kind, &e->where);
719 result->value.character.length = 1;
720 result->value.character.string = gfc_getmem (2);
722 result->value.character.string[0] = c;
723 result->value.character.string[1] = '\0'; /* For debugger */
729 /* Common subroutine for simplifying CMPLX and DCMPLX. */
732 simplify_cmplx (const char *name, gfc_expr *x, gfc_expr *y, int kind)
736 result = gfc_constant_result (BT_COMPLEX, kind, &x->where);
738 mpfr_set_ui (result->value.complex.i, 0, GFC_RND_MODE);
743 mpfr_set_z (result->value.complex.r, x->value.integer, GFC_RND_MODE);
747 mpfr_set (result->value.complex.r, x->value.real, GFC_RND_MODE);
751 mpfr_set (result->value.complex.r, x->value.complex.r, GFC_RND_MODE);
752 mpfr_set (result->value.complex.i, x->value.complex.i, GFC_RND_MODE);
756 gfc_internal_error ("gfc_simplify_dcmplx(): Bad type (x)");
764 mpfr_set_z (result->value.complex.i, y->value.integer, GFC_RND_MODE);
768 mpfr_set (result->value.complex.i, y->value.real, GFC_RND_MODE);
772 gfc_internal_error ("gfc_simplify_dcmplx(): Bad type (y)");
776 return range_check (result, name);
781 gfc_simplify_cmplx (gfc_expr *x, gfc_expr *y, gfc_expr *k)
785 if (x->expr_type != EXPR_CONSTANT
786 || (y != NULL && y->expr_type != EXPR_CONSTANT))
789 kind = get_kind (BT_REAL, k, "CMPLX", gfc_default_real_kind);
791 return &gfc_bad_expr;
793 return simplify_cmplx ("CMPLX", x, y, kind);
798 gfc_simplify_complex (gfc_expr *x, gfc_expr *y)
802 if (x->expr_type != EXPR_CONSTANT
803 || (y != NULL && y->expr_type != EXPR_CONSTANT))
806 if (x->ts.type == BT_INTEGER)
808 if (y->ts.type == BT_INTEGER)
809 kind = gfc_default_real_kind;
815 if (y->ts.type == BT_REAL)
816 kind = (x->ts.kind > y->ts.kind) ? x->ts.kind : y->ts.kind;
821 return simplify_cmplx ("COMPLEX", x, y, kind);
826 gfc_simplify_conjg (gfc_expr *e)
830 if (e->expr_type != EXPR_CONSTANT)
833 result = gfc_copy_expr (e);
834 mpfr_neg (result->value.complex.i, result->value.complex.i, GFC_RND_MODE);
836 return range_check (result, "CONJG");
841 gfc_simplify_cos (gfc_expr *x)
846 if (x->expr_type != EXPR_CONSTANT)
849 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
854 mpfr_cos (result->value.real, x->value.real, GFC_RND_MODE);
857 gfc_set_model_kind (x->ts.kind);
861 mpfr_cos (xp, x->value.complex.r, GFC_RND_MODE);
862 mpfr_cosh (xq, x->value.complex.i, GFC_RND_MODE);
863 mpfr_mul (result->value.complex.r, xp, xq, GFC_RND_MODE);
865 mpfr_sin (xp, x->value.complex.r, GFC_RND_MODE);
866 mpfr_sinh (xq, x->value.complex.i, GFC_RND_MODE);
867 mpfr_mul (xp, xp, xq, GFC_RND_MODE);
868 mpfr_neg (result->value.complex.i, xp, GFC_RND_MODE );
874 gfc_internal_error ("in gfc_simplify_cos(): Bad type");
877 return range_check (result, "COS");
883 gfc_simplify_cosh (gfc_expr *x)
887 if (x->expr_type != EXPR_CONSTANT)
890 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
892 mpfr_cosh (result->value.real, x->value.real, GFC_RND_MODE);
894 return range_check (result, "COSH");
899 gfc_simplify_dcmplx (gfc_expr *x, gfc_expr *y)
902 if (x->expr_type != EXPR_CONSTANT
903 || (y != NULL && y->expr_type != EXPR_CONSTANT))
906 return simplify_cmplx ("DCMPLX", x, y, gfc_default_double_kind);
911 gfc_simplify_dble (gfc_expr *e)
915 if (e->expr_type != EXPR_CONSTANT)
921 result = gfc_int2real (e, gfc_default_double_kind);
925 result = gfc_real2real (e, gfc_default_double_kind);
929 result = gfc_complex2real (e, gfc_default_double_kind);
933 gfc_internal_error ("gfc_simplify_dble(): bad type at %L", &e->where);
936 return range_check (result, "DBLE");
941 gfc_simplify_digits (gfc_expr *x)
945 i = gfc_validate_kind (x->ts.type, x->ts.kind, false);
949 digits = gfc_integer_kinds[i].digits;
954 digits = gfc_real_kinds[i].digits;
961 return gfc_int_expr (digits);
966 gfc_simplify_dim (gfc_expr *x, gfc_expr *y)
971 if (x->expr_type != EXPR_CONSTANT || y->expr_type != EXPR_CONSTANT)
974 kind = x->ts.kind > y->ts.kind ? x->ts.kind : y->ts.kind;
975 result = gfc_constant_result (x->ts.type, kind, &x->where);
980 if (mpz_cmp (x->value.integer, y->value.integer) > 0)
981 mpz_sub (result->value.integer, x->value.integer, y->value.integer);
983 mpz_set_ui (result->value.integer, 0);
988 if (mpfr_cmp (x->value.real, y->value.real) > 0)
989 mpfr_sub (result->value.real, x->value.real, y->value.real,
992 mpfr_set_ui (result->value.real, 0, GFC_RND_MODE);
997 gfc_internal_error ("gfc_simplify_dim(): Bad type");
1000 return range_check (result, "DIM");
1005 gfc_simplify_dprod (gfc_expr *x, gfc_expr *y)
1007 gfc_expr *a1, *a2, *result;
1009 if (x->expr_type != EXPR_CONSTANT || y->expr_type != EXPR_CONSTANT)
1012 result = gfc_constant_result (BT_REAL, gfc_default_double_kind, &x->where);
1014 a1 = gfc_real2real (x, gfc_default_double_kind);
1015 a2 = gfc_real2real (y, gfc_default_double_kind);
1017 mpfr_mul (result->value.real, a1->value.real, a2->value.real, GFC_RND_MODE);
1022 return range_check (result, "DPROD");
1027 gfc_simplify_epsilon (gfc_expr *e)
1032 i = gfc_validate_kind (e->ts.type, e->ts.kind, false);
1034 result = gfc_constant_result (BT_REAL, e->ts.kind, &e->where);
1036 mpfr_set (result->value.real, gfc_real_kinds[i].epsilon, GFC_RND_MODE);
1038 return range_check (result, "EPSILON");
1043 gfc_simplify_exp (gfc_expr *x)
1048 if (x->expr_type != EXPR_CONSTANT)
1051 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
1056 mpfr_exp (result->value.real, x->value.real, GFC_RND_MODE);
1060 gfc_set_model_kind (x->ts.kind);
1063 mpfr_exp (xq, x->value.complex.r, GFC_RND_MODE);
1064 mpfr_cos (xp, x->value.complex.i, GFC_RND_MODE);
1065 mpfr_mul (result->value.complex.r, xq, xp, GFC_RND_MODE);
1066 mpfr_sin (xp, x->value.complex.i, GFC_RND_MODE);
1067 mpfr_mul (result->value.complex.i, xq, xp, GFC_RND_MODE);
1073 gfc_internal_error ("in gfc_simplify_exp(): Bad type");
1076 return range_check (result, "EXP");
1080 gfc_simplify_exponent (gfc_expr *x)
1085 if (x->expr_type != EXPR_CONSTANT)
1088 result = gfc_constant_result (BT_INTEGER, gfc_default_integer_kind,
1091 gfc_set_model (x->value.real);
1093 if (mpfr_sgn (x->value.real) == 0)
1095 mpz_set_ui (result->value.integer, 0);
1099 i = (int) mpfr_get_exp (x->value.real);
1100 mpz_set_si (result->value.integer, i);
1102 return range_check (result, "EXPONENT");
1107 gfc_simplify_float (gfc_expr *a)
1111 if (a->expr_type != EXPR_CONSTANT)
1114 result = gfc_int2real (a, gfc_default_real_kind);
1115 return range_check (result, "FLOAT");
1120 gfc_simplify_floor (gfc_expr *e, gfc_expr *k)
1126 kind = get_kind (BT_INTEGER, k, "FLOOR", gfc_default_integer_kind);
1128 gfc_internal_error ("gfc_simplify_floor(): Bad kind");
1130 if (e->expr_type != EXPR_CONSTANT)
1133 result = gfc_constant_result (BT_INTEGER, kind, &e->where);
1135 gfc_set_model_kind (kind);
1137 mpfr_floor (floor, e->value.real);
1139 gfc_mpfr_to_mpz (result->value.integer, floor);
1143 return range_check (result, "FLOOR");
1148 gfc_simplify_fraction (gfc_expr *x)
1151 mpfr_t absv, exp, pow2;
1153 if (x->expr_type != EXPR_CONSTANT)
1156 result = gfc_constant_result (BT_REAL, x->ts.kind, &x->where);
1158 gfc_set_model_kind (x->ts.kind);
1160 if (mpfr_sgn (x->value.real) == 0)
1162 mpfr_set_ui (result->value.real, 0, GFC_RND_MODE);
1170 mpfr_abs (absv, x->value.real, GFC_RND_MODE);
1171 mpfr_log2 (exp, absv, GFC_RND_MODE);
1173 mpfr_trunc (exp, exp);
1174 mpfr_add_ui (exp, exp, 1, GFC_RND_MODE);
1176 mpfr_ui_pow (pow2, 2, exp, GFC_RND_MODE);
1178 mpfr_div (result->value.real, absv, pow2, GFC_RND_MODE);
1184 return range_check (result, "FRACTION");
1189 gfc_simplify_gamma (gfc_expr *x)
1193 if (x->expr_type != EXPR_CONSTANT)
1196 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
1198 gfc_set_model_kind (x->ts.kind);
1200 mpfr_gamma (result->value.real, x->value.real, GFC_RND_MODE);
1202 return range_check (result, "GAMMA");
1207 gfc_simplify_huge (gfc_expr *e)
1212 i = gfc_validate_kind (e->ts.type, e->ts.kind, false);
1214 result = gfc_constant_result (e->ts.type, e->ts.kind, &e->where);
1219 mpz_set (result->value.integer, gfc_integer_kinds[i].huge);
1223 mpfr_set (result->value.real, gfc_real_kinds[i].huge, GFC_RND_MODE);
1233 /* We use the processor's collating sequence, because all
1234 systems that gfortran currently works on are ASCII. */
1237 gfc_simplify_iachar (gfc_expr *e, gfc_expr *kind)
1242 if (e->expr_type != EXPR_CONSTANT)
1245 if (e->value.character.length != 1)
1247 gfc_error ("Argument of IACHAR at %L must be of length one", &e->where);
1248 return &gfc_bad_expr;
1251 index = (unsigned char) e->value.character.string[0];
1253 if (gfc_option.warn_surprising && index > 127)
1254 gfc_warning ("Argument of IACHAR function at %L outside of range 0..127",
1257 if ((result = int_expr_with_kind (index, kind, "IACHAR")) == NULL)
1258 return &gfc_bad_expr;
1260 result->where = e->where;
1262 return range_check (result, "IACHAR");
1267 gfc_simplify_iand (gfc_expr *x, gfc_expr *y)
1271 if (x->expr_type != EXPR_CONSTANT || y->expr_type != EXPR_CONSTANT)
1274 result = gfc_constant_result (BT_INTEGER, x->ts.kind, &x->where);
1276 mpz_and (result->value.integer, x->value.integer, y->value.integer);
1278 return range_check (result, "IAND");
1283 gfc_simplify_ibclr (gfc_expr *x, gfc_expr *y)
1288 if (x->expr_type != EXPR_CONSTANT || y->expr_type != EXPR_CONSTANT)
1291 if (gfc_extract_int (y, &pos) != NULL || pos < 0)
1293 gfc_error ("Invalid second argument of IBCLR at %L", &y->where);
1294 return &gfc_bad_expr;
1297 k = gfc_validate_kind (x->ts.type, x->ts.kind, false);
1299 if (pos >= gfc_integer_kinds[k].bit_size)
1301 gfc_error ("Second argument of IBCLR exceeds bit size at %L",
1303 return &gfc_bad_expr;
1306 result = gfc_copy_expr (x);
1308 convert_mpz_to_unsigned (result->value.integer,
1309 gfc_integer_kinds[k].bit_size);
1311 mpz_clrbit (result->value.integer, pos);
1313 convert_mpz_to_signed (result->value.integer,
1314 gfc_integer_kinds[k].bit_size);
1316 return range_check (result, "IBCLR");
1321 gfc_simplify_ibits (gfc_expr *x, gfc_expr *y, gfc_expr *z)
1328 if (x->expr_type != EXPR_CONSTANT
1329 || y->expr_type != EXPR_CONSTANT
1330 || z->expr_type != EXPR_CONSTANT)
1333 if (gfc_extract_int (y, &pos) != NULL || pos < 0)
1335 gfc_error ("Invalid second argument of IBITS at %L", &y->where);
1336 return &gfc_bad_expr;
1339 if (gfc_extract_int (z, &len) != NULL || len < 0)
1341 gfc_error ("Invalid third argument of IBITS at %L", &z->where);
1342 return &gfc_bad_expr;
1345 k = gfc_validate_kind (BT_INTEGER, x->ts.kind, false);
1347 bitsize = gfc_integer_kinds[k].bit_size;
1349 if (pos + len > bitsize)
1351 gfc_error ("Sum of second and third arguments of IBITS exceeds "
1352 "bit size at %L", &y->where);
1353 return &gfc_bad_expr;
1356 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
1358 bits = gfc_getmem (bitsize * sizeof (int));
1360 for (i = 0; i < bitsize; i++)
1363 for (i = 0; i < len; i++)
1364 bits[i] = mpz_tstbit (x->value.integer, i + pos);
1366 for (i = 0; i < bitsize; i++)
1369 mpz_clrbit (result->value.integer, i);
1370 else if (bits[i] == 1)
1371 mpz_setbit (result->value.integer, i);
1373 gfc_internal_error ("IBITS: Bad bit");
1378 return range_check (result, "IBITS");
1383 gfc_simplify_ibset (gfc_expr *x, gfc_expr *y)
1388 if (x->expr_type != EXPR_CONSTANT || y->expr_type != EXPR_CONSTANT)
1391 if (gfc_extract_int (y, &pos) != NULL || pos < 0)
1393 gfc_error ("Invalid second argument of IBSET at %L", &y->where);
1394 return &gfc_bad_expr;
1397 k = gfc_validate_kind (x->ts.type, x->ts.kind, false);
1399 if (pos >= gfc_integer_kinds[k].bit_size)
1401 gfc_error ("Second argument of IBSET exceeds bit size at %L",
1403 return &gfc_bad_expr;
1406 result = gfc_copy_expr (x);
1408 convert_mpz_to_unsigned (result->value.integer,
1409 gfc_integer_kinds[k].bit_size);
1411 mpz_setbit (result->value.integer, pos);
1413 convert_mpz_to_signed (result->value.integer,
1414 gfc_integer_kinds[k].bit_size);
1416 return range_check (result, "IBSET");
1421 gfc_simplify_ichar (gfc_expr *e, gfc_expr *kind)
1426 if (e->expr_type != EXPR_CONSTANT)
1429 if (e->value.character.length != 1)
1431 gfc_error ("Argument of ICHAR at %L must be of length one", &e->where);
1432 return &gfc_bad_expr;
1435 index = (unsigned char) e->value.character.string[0];
1437 if (index < 0 || index > UCHAR_MAX)
1438 gfc_internal_error("Argument of ICHAR at %L out of range", &e->where);
1440 if ((result = int_expr_with_kind (index, kind, "ICHAR")) == NULL)
1441 return &gfc_bad_expr;
1443 result->where = e->where;
1444 return range_check (result, "ICHAR");
1449 gfc_simplify_ieor (gfc_expr *x, gfc_expr *y)
1453 if (x->expr_type != EXPR_CONSTANT || y->expr_type != EXPR_CONSTANT)
1456 result = gfc_constant_result (BT_INTEGER, x->ts.kind, &x->where);
1458 mpz_xor (result->value.integer, x->value.integer, y->value.integer);
1460 return range_check (result, "IEOR");
1465 gfc_simplify_index (gfc_expr *x, gfc_expr *y, gfc_expr *b, gfc_expr *kind)
1468 int back, len, lensub;
1469 int i, j, k, count, index = 0, start;
1471 if (x->expr_type != EXPR_CONSTANT || y->expr_type != EXPR_CONSTANT)
1474 if (b != NULL && b->value.logical != 0)
1479 k = get_kind (BT_INTEGER, kind, "INDEX", gfc_default_integer_kind);
1481 return &gfc_bad_expr;
1483 result = gfc_constant_result (BT_INTEGER, k, &x->where);
1485 len = x->value.character.length;
1486 lensub = y->value.character.length;
1490 mpz_set_si (result->value.integer, 0);
1498 mpz_set_si (result->value.integer, 1);
1501 else if (lensub == 1)
1503 for (i = 0; i < len; i++)
1505 for (j = 0; j < lensub; j++)
1507 if (y->value.character.string[j]
1508 == x->value.character.string[i])
1518 for (i = 0; i < len; i++)
1520 for (j = 0; j < lensub; j++)
1522 if (y->value.character.string[j]
1523 == x->value.character.string[i])
1528 for (k = 0; k < lensub; k++)
1530 if (y->value.character.string[k]
1531 == x->value.character.string[k + start])
1535 if (count == lensub)
1550 mpz_set_si (result->value.integer, len + 1);
1553 else if (lensub == 1)
1555 for (i = 0; i < len; i++)
1557 for (j = 0; j < lensub; j++)
1559 if (y->value.character.string[j]
1560 == x->value.character.string[len - i])
1562 index = len - i + 1;
1570 for (i = 0; i < len; i++)
1572 for (j = 0; j < lensub; j++)
1574 if (y->value.character.string[j]
1575 == x->value.character.string[len - i])
1578 if (start <= len - lensub)
1581 for (k = 0; k < lensub; k++)
1582 if (y->value.character.string[k]
1583 == x->value.character.string[k + start])
1586 if (count == lensub)
1603 mpz_set_si (result->value.integer, index);
1604 return range_check (result, "INDEX");
1609 gfc_simplify_int (gfc_expr *e, gfc_expr *k)
1611 gfc_expr *rpart, *rtrunc, *result;
1614 kind = get_kind (BT_INTEGER, k, "INT", gfc_default_integer_kind);
1616 return &gfc_bad_expr;
1618 if (e->expr_type != EXPR_CONSTANT)
1621 result = gfc_constant_result (BT_INTEGER, kind, &e->where);
1626 mpz_set (result->value.integer, e->value.integer);
1630 rtrunc = gfc_copy_expr (e);
1631 mpfr_trunc (rtrunc->value.real, e->value.real);
1632 gfc_mpfr_to_mpz (result->value.integer, rtrunc->value.real);
1633 gfc_free_expr (rtrunc);
1637 rpart = gfc_complex2real (e, kind);
1638 rtrunc = gfc_copy_expr (rpart);
1639 mpfr_trunc (rtrunc->value.real, rpart->value.real);
1640 gfc_mpfr_to_mpz (result->value.integer, rtrunc->value.real);
1641 gfc_free_expr (rpart);
1642 gfc_free_expr (rtrunc);
1646 gfc_error ("Argument of INT at %L is not a valid type", &e->where);
1647 gfc_free_expr (result);
1648 return &gfc_bad_expr;
1651 return range_check (result, "INT");
1656 gfc_simplify_intconv (gfc_expr *e, int kind, const char *name)
1658 gfc_expr *rpart, *rtrunc, *result;
1660 if (e->expr_type != EXPR_CONSTANT)
1663 result = gfc_constant_result (BT_INTEGER, kind, &e->where);
1668 mpz_set (result->value.integer, e->value.integer);
1672 rtrunc = gfc_copy_expr (e);
1673 mpfr_trunc (rtrunc->value.real, e->value.real);
1674 gfc_mpfr_to_mpz (result->value.integer, rtrunc->value.real);
1675 gfc_free_expr (rtrunc);
1679 rpart = gfc_complex2real (e, kind);
1680 rtrunc = gfc_copy_expr (rpart);
1681 mpfr_trunc (rtrunc->value.real, rpart->value.real);
1682 gfc_mpfr_to_mpz (result->value.integer, rtrunc->value.real);
1683 gfc_free_expr (rpart);
1684 gfc_free_expr (rtrunc);
1688 gfc_error ("Argument of %s at %L is not a valid type", name, &e->where);
1689 gfc_free_expr (result);
1690 return &gfc_bad_expr;
1693 return range_check (result, name);
1698 gfc_simplify_int2 (gfc_expr *e)
1700 return gfc_simplify_intconv (e, 2, "INT2");
1705 gfc_simplify_int8 (gfc_expr *e)
1707 return gfc_simplify_intconv (e, 8, "INT8");
1712 gfc_simplify_long (gfc_expr *e)
1714 return gfc_simplify_intconv (e, 4, "LONG");
1719 gfc_simplify_ifix (gfc_expr *e)
1721 gfc_expr *rtrunc, *result;
1723 if (e->expr_type != EXPR_CONSTANT)
1726 result = gfc_constant_result (BT_INTEGER, gfc_default_integer_kind,
1729 rtrunc = gfc_copy_expr (e);
1731 mpfr_trunc (rtrunc->value.real, e->value.real);
1732 gfc_mpfr_to_mpz (result->value.integer, rtrunc->value.real);
1734 gfc_free_expr (rtrunc);
1735 return range_check (result, "IFIX");
1740 gfc_simplify_idint (gfc_expr *e)
1742 gfc_expr *rtrunc, *result;
1744 if (e->expr_type != EXPR_CONSTANT)
1747 result = gfc_constant_result (BT_INTEGER, gfc_default_integer_kind,
1750 rtrunc = gfc_copy_expr (e);
1752 mpfr_trunc (rtrunc->value.real, e->value.real);
1753 gfc_mpfr_to_mpz (result->value.integer, rtrunc->value.real);
1755 gfc_free_expr (rtrunc);
1756 return range_check (result, "IDINT");
1761 gfc_simplify_ior (gfc_expr *x, gfc_expr *y)
1765 if (x->expr_type != EXPR_CONSTANT || y->expr_type != EXPR_CONSTANT)
1768 result = gfc_constant_result (BT_INTEGER, x->ts.kind, &x->where);
1770 mpz_ior (result->value.integer, x->value.integer, y->value.integer);
1771 return range_check (result, "IOR");
1776 gfc_simplify_ishft (gfc_expr *e, gfc_expr *s)
1779 int shift, ashift, isize, k, *bits, i;
1781 if (e->expr_type != EXPR_CONSTANT || s->expr_type != EXPR_CONSTANT)
1784 if (gfc_extract_int (s, &shift) != NULL)
1786 gfc_error ("Invalid second argument of ISHFT at %L", &s->where);
1787 return &gfc_bad_expr;
1790 k = gfc_validate_kind (BT_INTEGER, e->ts.kind, false);
1792 isize = gfc_integer_kinds[k].bit_size;
1801 gfc_error ("Magnitude of second argument of ISHFT exceeds bit size "
1802 "at %L", &s->where);
1803 return &gfc_bad_expr;
1806 result = gfc_constant_result (e->ts.type, e->ts.kind, &e->where);
1810 mpz_set (result->value.integer, e->value.integer);
1811 return range_check (result, "ISHFT");
1814 bits = gfc_getmem (isize * sizeof (int));
1816 for (i = 0; i < isize; i++)
1817 bits[i] = mpz_tstbit (e->value.integer, i);
1821 for (i = 0; i < shift; i++)
1822 mpz_clrbit (result->value.integer, i);
1824 for (i = 0; i < isize - shift; i++)
1827 mpz_clrbit (result->value.integer, i + shift);
1829 mpz_setbit (result->value.integer, i + shift);
1834 for (i = isize - 1; i >= isize - ashift; i--)
1835 mpz_clrbit (result->value.integer, i);
1837 for (i = isize - 1; i >= ashift; i--)
1840 mpz_clrbit (result->value.integer, i - ashift);
1842 mpz_setbit (result->value.integer, i - ashift);
1846 convert_mpz_to_signed (result->value.integer, isize);
1854 gfc_simplify_ishftc (gfc_expr *e, gfc_expr *s, gfc_expr *sz)
1857 int shift, ashift, isize, ssize, delta, k;
1860 if (e->expr_type != EXPR_CONSTANT || s->expr_type != EXPR_CONSTANT)
1863 if (gfc_extract_int (s, &shift) != NULL)
1865 gfc_error ("Invalid second argument of ISHFTC at %L", &s->where);
1866 return &gfc_bad_expr;
1869 k = gfc_validate_kind (e->ts.type, e->ts.kind, false);
1870 isize = gfc_integer_kinds[k].bit_size;
1874 if (sz->expr_type != EXPR_CONSTANT)
1877 if (gfc_extract_int (sz, &ssize) != NULL || ssize <= 0)
1879 gfc_error ("Invalid third argument of ISHFTC at %L", &sz->where);
1880 return &gfc_bad_expr;
1885 gfc_error ("Magnitude of third argument of ISHFTC exceeds "
1886 "BIT_SIZE of first argument at %L", &s->where);
1887 return &gfc_bad_expr;
1901 gfc_error ("Magnitude of second argument of ISHFTC exceeds "
1902 "third argument at %L", &s->where);
1904 gfc_error ("Magnitude of second argument of ISHFTC exceeds "
1905 "BIT_SIZE of first argument at %L", &s->where);
1906 return &gfc_bad_expr;
1909 result = gfc_constant_result (e->ts.type, e->ts.kind, &e->where);
1911 mpz_set (result->value.integer, e->value.integer);
1916 convert_mpz_to_unsigned (result->value.integer, isize);
1918 bits = gfc_getmem (ssize * sizeof (int));
1920 for (i = 0; i < ssize; i++)
1921 bits[i] = mpz_tstbit (e->value.integer, i);
1923 delta = ssize - ashift;
1927 for (i = 0; i < delta; i++)
1930 mpz_clrbit (result->value.integer, i + shift);
1932 mpz_setbit (result->value.integer, i + shift);
1935 for (i = delta; i < ssize; i++)
1938 mpz_clrbit (result->value.integer, i - delta);
1940 mpz_setbit (result->value.integer, i - delta);
1945 for (i = 0; i < ashift; i++)
1948 mpz_clrbit (result->value.integer, i + delta);
1950 mpz_setbit (result->value.integer, i + delta);
1953 for (i = ashift; i < ssize; i++)
1956 mpz_clrbit (result->value.integer, i + shift);
1958 mpz_setbit (result->value.integer, i + shift);
1962 convert_mpz_to_signed (result->value.integer, isize);
1970 gfc_simplify_kind (gfc_expr *e)
1973 if (e->ts.type == BT_DERIVED)
1975 gfc_error ("Argument of KIND at %L is a DERIVED type", &e->where);
1976 return &gfc_bad_expr;
1979 return gfc_int_expr (e->ts.kind);
1984 simplify_bound_dim (gfc_expr *array, gfc_expr *kind, int d, int upper,
1987 gfc_expr *l, *u, *result;
1990 /* The last dimension of an assumed-size array is special. */
1991 if (d == as->rank && as->type == AS_ASSUMED_SIZE && !upper)
1993 if (as->lower[d-1]->expr_type == EXPR_CONSTANT)
1994 return gfc_copy_expr (as->lower[d-1]);
1999 /* Then, we need to know the extent of the given dimension. */
2003 if (l->expr_type != EXPR_CONSTANT || u->expr_type != EXPR_CONSTANT)
2006 k = get_kind (BT_INTEGER, kind, upper ? "UBOUND" : "LBOUND",
2007 gfc_default_integer_kind);
2009 return &gfc_bad_expr;
2011 result = gfc_constant_result (BT_INTEGER, k, &array->where);
2013 if (mpz_cmp (l->value.integer, u->value.integer) > 0)
2017 mpz_set_si (result->value.integer, 0);
2019 mpz_set_si (result->value.integer, 1);
2023 /* Nonzero extent. */
2025 mpz_set (result->value.integer, u->value.integer);
2027 mpz_set (result->value.integer, l->value.integer);
2030 return range_check (result, upper ? "UBOUND" : "LBOUND");
2035 simplify_bound (gfc_expr *array, gfc_expr *dim, gfc_expr *kind, int upper)
2041 if (array->expr_type != EXPR_VARIABLE)
2044 /* Follow any component references. */
2045 as = array->symtree->n.sym->as;
2046 for (ref = array->ref; ref; ref = ref->next)
2051 switch (ref->u.ar.type)
2058 /* We're done because 'as' has already been set in the
2059 previous iteration. */
2070 as = ref->u.c.component->as;
2082 if (as->type == AS_DEFERRED || as->type == AS_ASSUMED_SHAPE)
2087 /* Multi-dimensional bounds. */
2088 gfc_expr *bounds[GFC_MAX_DIMENSIONS];
2090 gfc_constructor *head, *tail;
2093 /* UBOUND(ARRAY) is not valid for an assumed-size array. */
2094 if (upper && as->type == AS_ASSUMED_SIZE)
2096 /* An error message will be emitted in
2097 check_assumed_size_reference (resolve.c). */
2098 return &gfc_bad_expr;
2101 /* Simplify the bounds for each dimension. */
2102 for (d = 0; d < array->rank; d++)
2104 bounds[d] = simplify_bound_dim (array, kind, d + 1, upper, as);
2105 if (bounds[d] == NULL || bounds[d] == &gfc_bad_expr)
2109 for (j = 0; j < d; j++)
2110 gfc_free_expr (bounds[j]);
2115 /* Allocate the result expression. */
2116 e = gfc_get_expr ();
2117 e->where = array->where;
2118 e->expr_type = EXPR_ARRAY;
2119 e->ts.type = BT_INTEGER;
2120 k = get_kind (BT_INTEGER, kind, upper ? "UBOUND" : "LBOUND",
2121 gfc_default_integer_kind);
2123 return &gfc_bad_expr;
2126 /* The result is a rank 1 array; its size is the rank of the first
2127 argument to {L,U}BOUND. */
2129 e->shape = gfc_get_shape (1);
2130 mpz_init_set_ui (e->shape[0], array->rank);
2132 /* Create the constructor for this array. */
2134 for (d = 0; d < array->rank; d++)
2136 /* Get a new constructor element. */
2138 head = tail = gfc_get_constructor ();
2141 tail->next = gfc_get_constructor ();
2145 tail->where = e->where;
2146 tail->expr = bounds[d];
2148 e->value.constructor = head;
2154 /* A DIM argument is specified. */
2155 if (dim->expr_type != EXPR_CONSTANT)
2158 d = mpz_get_si (dim->value.integer);
2160 if (d < 1 || d > as->rank
2161 || (d == as->rank && as->type == AS_ASSUMED_SIZE && upper))
2163 gfc_error ("DIM argument at %L is out of bounds", &dim->where);
2164 return &gfc_bad_expr;
2167 return simplify_bound_dim (array, kind, d, upper, as);
2173 gfc_simplify_lbound (gfc_expr *array, gfc_expr *dim, gfc_expr *kind)
2175 return simplify_bound (array, dim, kind, 0);
2180 gfc_simplify_len (gfc_expr *e, gfc_expr *kind)
2183 int k = get_kind (BT_INTEGER, kind, "LEN", gfc_default_integer_kind);
2186 return &gfc_bad_expr;
2188 if (e->expr_type == EXPR_CONSTANT)
2190 result = gfc_constant_result (BT_INTEGER, k, &e->where);
2191 mpz_set_si (result->value.integer, e->value.character.length);
2192 return range_check (result, "LEN");
2195 if (e->ts.cl != NULL && e->ts.cl->length != NULL
2196 && e->ts.cl->length->expr_type == EXPR_CONSTANT
2197 && e->ts.cl->length->ts.type == BT_INTEGER)
2199 result = gfc_constant_result (BT_INTEGER, k, &e->where);
2200 mpz_set (result->value.integer, e->ts.cl->length->value.integer);
2201 return range_check (result, "LEN");
2209 gfc_simplify_len_trim (gfc_expr *e, gfc_expr *kind)
2212 int count, len, lentrim, i;
2213 int k = get_kind (BT_INTEGER, kind, "LEN_TRIM", gfc_default_integer_kind);
2216 return &gfc_bad_expr;
2218 if (e->expr_type != EXPR_CONSTANT)
2221 result = gfc_constant_result (BT_INTEGER, k, &e->where);
2222 len = e->value.character.length;
2224 for (count = 0, i = 1; i <= len; i++)
2225 if (e->value.character.string[len - i] == ' ')
2230 lentrim = len - count;
2232 mpz_set_si (result->value.integer, lentrim);
2233 return range_check (result, "LEN_TRIM");
2237 gfc_simplify_lgamma (gfc_expr *x __attribute__((unused)))
2239 #if MPFR_VERSION >= MPFR_VERSION_NUM(2,3,0)
2243 if (x->expr_type != EXPR_CONSTANT)
2246 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
2248 gfc_set_model_kind (x->ts.kind);
2250 mpfr_lgamma (result->value.real, &sg, x->value.real, GFC_RND_MODE);
2252 return range_check (result, "LGAMMA");
2260 gfc_simplify_lge (gfc_expr *a, gfc_expr *b)
2262 if (a->expr_type != EXPR_CONSTANT || b->expr_type != EXPR_CONSTANT)
2265 return gfc_logical_expr (gfc_compare_string (a, b) >= 0, &a->where);
2270 gfc_simplify_lgt (gfc_expr *a, gfc_expr *b)
2272 if (a->expr_type != EXPR_CONSTANT || b->expr_type != EXPR_CONSTANT)
2275 return gfc_logical_expr (gfc_compare_string (a, b) > 0,
2281 gfc_simplify_lle (gfc_expr *a, gfc_expr *b)
2283 if (a->expr_type != EXPR_CONSTANT || b->expr_type != EXPR_CONSTANT)
2286 return gfc_logical_expr (gfc_compare_string (a, b) <= 0, &a->where);
2291 gfc_simplify_llt (gfc_expr *a, gfc_expr *b)
2293 if (a->expr_type != EXPR_CONSTANT || b->expr_type != EXPR_CONSTANT)
2296 return gfc_logical_expr (gfc_compare_string (a, b) < 0, &a->where);
2301 gfc_simplify_log (gfc_expr *x)
2306 if (x->expr_type != EXPR_CONSTANT)
2309 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
2311 gfc_set_model_kind (x->ts.kind);
2316 if (mpfr_sgn (x->value.real) <= 0)
2318 gfc_error ("Argument of LOG at %L cannot be less than or equal "
2319 "to zero", &x->where);
2320 gfc_free_expr (result);
2321 return &gfc_bad_expr;
2324 mpfr_log (result->value.real, x->value.real, GFC_RND_MODE);
2328 if ((mpfr_sgn (x->value.complex.r) == 0)
2329 && (mpfr_sgn (x->value.complex.i) == 0))
2331 gfc_error ("Complex argument of LOG at %L cannot be zero",
2333 gfc_free_expr (result);
2334 return &gfc_bad_expr;
2340 mpfr_atan2 (result->value.complex.i, x->value.complex.i,
2341 x->value.complex.r, GFC_RND_MODE);
2343 mpfr_mul (xr, x->value.complex.r, x->value.complex.r, GFC_RND_MODE);
2344 mpfr_mul (xi, x->value.complex.i, x->value.complex.i, GFC_RND_MODE);
2345 mpfr_add (xr, xr, xi, GFC_RND_MODE);
2346 mpfr_sqrt (xr, xr, GFC_RND_MODE);
2347 mpfr_log (result->value.complex.r, xr, GFC_RND_MODE);
2355 gfc_internal_error ("gfc_simplify_log: bad type");
2358 return range_check (result, "LOG");
2363 gfc_simplify_log10 (gfc_expr *x)
2367 if (x->expr_type != EXPR_CONSTANT)
2370 gfc_set_model_kind (x->ts.kind);
2372 if (mpfr_sgn (x->value.real) <= 0)
2374 gfc_error ("Argument of LOG10 at %L cannot be less than or equal "
2375 "to zero", &x->where);
2376 return &gfc_bad_expr;
2379 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
2381 mpfr_log10 (result->value.real, x->value.real, GFC_RND_MODE);
2383 return range_check (result, "LOG10");
2388 gfc_simplify_logical (gfc_expr *e, gfc_expr *k)
2393 kind = get_kind (BT_LOGICAL, k, "LOGICAL", gfc_default_logical_kind);
2395 return &gfc_bad_expr;
2397 if (e->expr_type != EXPR_CONSTANT)
2400 result = gfc_constant_result (BT_LOGICAL, kind, &e->where);
2402 result->value.logical = e->value.logical;
2408 /* This function is special since MAX() can take any number of
2409 arguments. The simplified expression is a rewritten version of the
2410 argument list containing at most one constant element. Other
2411 constant elements are deleted. Because the argument list has
2412 already been checked, this function always succeeds. sign is 1 for
2413 MAX(), -1 for MIN(). */
2416 simplify_min_max (gfc_expr *expr, int sign)
2418 gfc_actual_arglist *arg, *last, *extremum;
2419 gfc_intrinsic_sym * specific;
2423 specific = expr->value.function.isym;
2425 arg = expr->value.function.actual;
2427 for (; arg; last = arg, arg = arg->next)
2429 if (arg->expr->expr_type != EXPR_CONSTANT)
2432 if (extremum == NULL)
2438 switch (arg->expr->ts.type)
2441 if (mpz_cmp (arg->expr->value.integer,
2442 extremum->expr->value.integer) * sign > 0)
2443 mpz_set (extremum->expr->value.integer, arg->expr->value.integer);
2447 if (mpfr_cmp (arg->expr->value.real, extremum->expr->value.real)
2449 mpfr_set (extremum->expr->value.real, arg->expr->value.real,
2454 #define LENGTH(x) ((x)->expr->value.character.length)
2455 #define STRING(x) ((x)->expr->value.character.string)
2456 if (LENGTH(extremum) < LENGTH(arg))
2458 char * tmp = STRING(extremum);
2460 STRING(extremum) = gfc_getmem (LENGTH(arg) + 1);
2461 memcpy (STRING(extremum), tmp, LENGTH(extremum));
2462 memset (&STRING(extremum)[LENGTH(extremum)], ' ',
2463 LENGTH(arg) - LENGTH(extremum));
2464 STRING(extremum)[LENGTH(arg)] = '\0'; /* For debugger */
2465 LENGTH(extremum) = LENGTH(arg);
2469 if (gfc_compare_string (arg->expr, extremum->expr) * sign > 0)
2471 gfc_free (STRING(extremum));
2472 STRING(extremum) = gfc_getmem (LENGTH(extremum) + 1);
2473 memcpy (STRING(extremum), STRING(arg), LENGTH(arg));
2474 memset (&STRING(extremum)[LENGTH(arg)], ' ',
2475 LENGTH(extremum) - LENGTH(arg));
2476 STRING(extremum)[LENGTH(extremum)] = '\0'; /* For debugger */
2484 gfc_internal_error ("simplify_min_max(): Bad type in arglist");
2487 /* Delete the extra constant argument. */
2489 expr->value.function.actual = arg->next;
2491 last->next = arg->next;
2494 gfc_free_actual_arglist (arg);
2498 /* If there is one value left, replace the function call with the
2500 if (expr->value.function.actual->next != NULL)
2503 /* Convert to the correct type and kind. */
2504 if (expr->ts.type != BT_UNKNOWN)
2505 return gfc_convert_constant (expr->value.function.actual->expr,
2506 expr->ts.type, expr->ts.kind);
2508 if (specific->ts.type != BT_UNKNOWN)
2509 return gfc_convert_constant (expr->value.function.actual->expr,
2510 specific->ts.type, specific->ts.kind);
2512 return gfc_copy_expr (expr->value.function.actual->expr);
2517 gfc_simplify_min (gfc_expr *e)
2519 return simplify_min_max (e, -1);
2524 gfc_simplify_max (gfc_expr *e)
2526 return simplify_min_max (e, 1);
2531 gfc_simplify_maxexponent (gfc_expr *x)
2536 i = gfc_validate_kind (BT_REAL, x->ts.kind, false);
2538 result = gfc_int_expr (gfc_real_kinds[i].max_exponent);
2539 result->where = x->where;
2546 gfc_simplify_minexponent (gfc_expr *x)
2551 i = gfc_validate_kind (BT_REAL, x->ts.kind, false);
2553 result = gfc_int_expr (gfc_real_kinds[i].min_exponent);
2554 result->where = x->where;
2561 gfc_simplify_mod (gfc_expr *a, gfc_expr *p)
2564 mpfr_t quot, iquot, term;
2567 if (a->expr_type != EXPR_CONSTANT || p->expr_type != EXPR_CONSTANT)
2570 kind = a->ts.kind > p->ts.kind ? a->ts.kind : p->ts.kind;
2571 result = gfc_constant_result (a->ts.type, kind, &a->where);
2576 if (mpz_cmp_ui (p->value.integer, 0) == 0)
2578 /* Result is processor-dependent. */
2579 gfc_error ("Second argument MOD at %L is zero", &a->where);
2580 gfc_free_expr (result);
2581 return &gfc_bad_expr;
2583 mpz_tdiv_r (result->value.integer, a->value.integer, p->value.integer);
2587 if (mpfr_cmp_ui (p->value.real, 0) == 0)
2589 /* Result is processor-dependent. */
2590 gfc_error ("Second argument of MOD at %L is zero", &p->where);
2591 gfc_free_expr (result);
2592 return &gfc_bad_expr;
2595 gfc_set_model_kind (kind);
2600 mpfr_div (quot, a->value.real, p->value.real, GFC_RND_MODE);
2601 mpfr_trunc (iquot, quot);
2602 mpfr_mul (term, iquot, p->value.real, GFC_RND_MODE);
2603 mpfr_sub (result->value.real, a->value.real, term, GFC_RND_MODE);
2611 gfc_internal_error ("gfc_simplify_mod(): Bad arguments");
2614 return range_check (result, "MOD");
2619 gfc_simplify_modulo (gfc_expr *a, gfc_expr *p)
2622 mpfr_t quot, iquot, term;
2625 if (a->expr_type != EXPR_CONSTANT || p->expr_type != EXPR_CONSTANT)
2628 kind = a->ts.kind > p->ts.kind ? a->ts.kind : p->ts.kind;
2629 result = gfc_constant_result (a->ts.type, kind, &a->where);
2634 if (mpz_cmp_ui (p->value.integer, 0) == 0)
2636 /* Result is processor-dependent. This processor just opts
2637 to not handle it at all. */
2638 gfc_error ("Second argument of MODULO at %L is zero", &a->where);
2639 gfc_free_expr (result);
2640 return &gfc_bad_expr;
2642 mpz_fdiv_r (result->value.integer, a->value.integer, p->value.integer);
2647 if (mpfr_cmp_ui (p->value.real, 0) == 0)
2649 /* Result is processor-dependent. */
2650 gfc_error ("Second argument of MODULO at %L is zero", &p->where);
2651 gfc_free_expr (result);
2652 return &gfc_bad_expr;
2655 gfc_set_model_kind (kind);
2660 mpfr_div (quot, a->value.real, p->value.real, GFC_RND_MODE);
2661 mpfr_floor (iquot, quot);
2662 mpfr_mul (term, iquot, p->value.real, GFC_RND_MODE);
2663 mpfr_sub (result->value.real, a->value.real, term, GFC_RND_MODE);
2671 gfc_internal_error ("gfc_simplify_modulo(): Bad arguments");
2674 return range_check (result, "MODULO");
2678 /* Exists for the sole purpose of consistency with other intrinsics. */
2680 gfc_simplify_mvbits (gfc_expr *f ATTRIBUTE_UNUSED,
2681 gfc_expr *fp ATTRIBUTE_UNUSED,
2682 gfc_expr *l ATTRIBUTE_UNUSED,
2683 gfc_expr *to ATTRIBUTE_UNUSED,
2684 gfc_expr *tp ATTRIBUTE_UNUSED)
2691 gfc_simplify_nearest (gfc_expr *x, gfc_expr *s)
2694 mp_exp_t emin, emax;
2697 if (x->expr_type != EXPR_CONSTANT || s->expr_type != EXPR_CONSTANT)
2700 if (mpfr_sgn (s->value.real) == 0)
2702 gfc_error ("Second argument of NEAREST at %L shall not be zero",
2704 return &gfc_bad_expr;
2707 gfc_set_model_kind (x->ts.kind);
2708 result = gfc_copy_expr (x);
2710 /* Save current values of emin and emax. */
2711 emin = mpfr_get_emin ();
2712 emax = mpfr_get_emax ();
2714 /* Set emin and emax for the current model number. */
2715 kind = gfc_validate_kind (BT_REAL, x->ts.kind, 0);
2716 mpfr_set_emin ((mp_exp_t) gfc_real_kinds[kind].min_exponent -
2717 mpfr_get_prec(result->value.real) + 1);
2718 mpfr_set_emax ((mp_exp_t) gfc_real_kinds[kind].max_exponent - 1);
2720 if (mpfr_sgn (s->value.real) > 0)
2722 mpfr_nextabove (result->value.real);
2723 mpfr_subnormalize (result->value.real, 0, GMP_RNDU);
2727 mpfr_nextbelow (result->value.real);
2728 mpfr_subnormalize (result->value.real, 0, GMP_RNDD);
2731 mpfr_set_emin (emin);
2732 mpfr_set_emax (emax);
2734 /* Only NaN can occur. Do not use range check as it gives an
2735 error for denormal numbers. */
2736 if (mpfr_nan_p (result->value.real) && gfc_option.flag_range_check)
2738 gfc_error ("Result of NEAREST is NaN at %L", &result->where);
2739 return &gfc_bad_expr;
2747 simplify_nint (const char *name, gfc_expr *e, gfc_expr *k)
2749 gfc_expr *itrunc, *result;
2752 kind = get_kind (BT_INTEGER, k, name, gfc_default_integer_kind);
2754 return &gfc_bad_expr;
2756 if (e->expr_type != EXPR_CONSTANT)
2759 result = gfc_constant_result (BT_INTEGER, kind, &e->where);
2761 itrunc = gfc_copy_expr (e);
2763 mpfr_round (itrunc->value.real, e->value.real);
2765 gfc_mpfr_to_mpz (result->value.integer, itrunc->value.real);
2767 gfc_free_expr (itrunc);
2769 return range_check (result, name);
2774 gfc_simplify_new_line (gfc_expr *e)
2778 result = gfc_constant_result (BT_CHARACTER, e->ts.kind, &e->where);
2779 result->value.character.string = gfc_getmem (2);
2780 result->value.character.length = 1;
2781 result->value.character.string[0] = '\n';
2782 result->value.character.string[1] = '\0'; /* For debugger */
2788 gfc_simplify_nint (gfc_expr *e, gfc_expr *k)
2790 return simplify_nint ("NINT", e, k);
2795 gfc_simplify_idnint (gfc_expr *e)
2797 return simplify_nint ("IDNINT", e, NULL);
2802 gfc_simplify_not (gfc_expr *e)
2806 if (e->expr_type != EXPR_CONSTANT)
2809 result = gfc_constant_result (e->ts.type, e->ts.kind, &e->where);
2811 mpz_com (result->value.integer, e->value.integer);
2813 return range_check (result, "NOT");
2818 gfc_simplify_null (gfc_expr *mold)
2824 result = gfc_get_expr ();
2825 result->ts.type = BT_UNKNOWN;
2828 result = gfc_copy_expr (mold);
2829 result->expr_type = EXPR_NULL;
2836 gfc_simplify_or (gfc_expr *x, gfc_expr *y)
2841 if (x->expr_type != EXPR_CONSTANT || y->expr_type != EXPR_CONSTANT)
2844 kind = x->ts.kind > y->ts.kind ? x->ts.kind : y->ts.kind;
2845 if (x->ts.type == BT_INTEGER)
2847 result = gfc_constant_result (BT_INTEGER, kind, &x->where);
2848 mpz_ior (result->value.integer, x->value.integer, y->value.integer);
2850 else /* BT_LOGICAL */
2852 result = gfc_constant_result (BT_LOGICAL, kind, &x->where);
2853 result->value.logical = x->value.logical || y->value.logical;
2856 return range_check (result, "OR");
2861 gfc_simplify_precision (gfc_expr *e)
2866 i = gfc_validate_kind (e->ts.type, e->ts.kind, false);
2868 result = gfc_int_expr (gfc_real_kinds[i].precision);
2869 result->where = e->where;
2876 gfc_simplify_radix (gfc_expr *e)
2881 i = gfc_validate_kind (e->ts.type, e->ts.kind, false);
2885 i = gfc_integer_kinds[i].radix;
2889 i = gfc_real_kinds[i].radix;
2896 result = gfc_int_expr (i);
2897 result->where = e->where;
2904 gfc_simplify_range (gfc_expr *e)
2910 i = gfc_validate_kind (e->ts.type, e->ts.kind, false);
2915 j = gfc_integer_kinds[i].range;
2920 j = gfc_real_kinds[i].range;
2927 result = gfc_int_expr (j);
2928 result->where = e->where;
2935 gfc_simplify_real (gfc_expr *e, gfc_expr *k)
2940 if (e->ts.type == BT_COMPLEX)
2941 kind = get_kind (BT_REAL, k, "REAL", e->ts.kind);
2943 kind = get_kind (BT_REAL, k, "REAL", gfc_default_real_kind);
2946 return &gfc_bad_expr;
2948 if (e->expr_type != EXPR_CONSTANT)
2954 result = gfc_int2real (e, kind);
2958 result = gfc_real2real (e, kind);
2962 result = gfc_complex2real (e, kind);
2966 gfc_internal_error ("bad type in REAL");
2970 return range_check (result, "REAL");
2975 gfc_simplify_realpart (gfc_expr *e)
2979 if (e->expr_type != EXPR_CONSTANT)
2982 result = gfc_constant_result (BT_REAL, e->ts.kind, &e->where);
2983 mpfr_set (result->value.real, e->value.complex.r, GFC_RND_MODE);
2985 return range_check (result, "REALPART");
2989 gfc_simplify_repeat (gfc_expr *e, gfc_expr *n)
2992 int i, j, len, ncop, nlen;
2994 bool have_length = false;
2996 /* If NCOPIES isn't a constant, there's nothing we can do. */
2997 if (n->expr_type != EXPR_CONSTANT)
3000 /* If NCOPIES is negative, it's an error. */
3001 if (mpz_sgn (n->value.integer) < 0)
3003 gfc_error ("Argument NCOPIES of REPEAT intrinsic is negative at %L",
3005 return &gfc_bad_expr;
3008 /* If we don't know the character length, we can do no more. */
3009 if (e->ts.cl && e->ts.cl->length
3010 && e->ts.cl->length->expr_type == EXPR_CONSTANT)
3012 len = mpz_get_si (e->ts.cl->length->value.integer);
3015 else if (e->expr_type == EXPR_CONSTANT
3016 && (e->ts.cl == NULL || e->ts.cl->length == NULL))
3018 len = e->value.character.length;
3023 /* If the source length is 0, any value of NCOPIES is valid
3024 and everything behaves as if NCOPIES == 0. */
3027 mpz_set_ui (ncopies, 0);
3029 mpz_set (ncopies, n->value.integer);
3031 /* Check that NCOPIES isn't too large. */
3037 /* Compute the maximum value allowed for NCOPIES: huge(cl) / len. */
3039 i = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
3043 mpz_tdiv_q (max, gfc_integer_kinds[i].huge,
3044 e->ts.cl->length->value.integer);
3048 mpz_init_set_si (mlen, len);
3049 mpz_tdiv_q (max, gfc_integer_kinds[i].huge, mlen);
3053 /* The check itself. */
3054 if (mpz_cmp (ncopies, max) > 0)
3057 mpz_clear (ncopies);
3058 gfc_error ("Argument NCOPIES of REPEAT intrinsic is too large at %L",
3060 return &gfc_bad_expr;
3065 mpz_clear (ncopies);
3067 /* For further simplification, we need the character string to be
3069 if (e->expr_type != EXPR_CONSTANT)
3072 if (len || mpz_sgn (e->ts.cl->length->value.integer) != 0)
3074 const char *res = gfc_extract_int (n, &ncop);
3075 gcc_assert (res == NULL);
3080 len = e->value.character.length;
3083 result = gfc_constant_result (BT_CHARACTER, e->ts.kind, &e->where);
3087 result->value.character.string = gfc_getmem (1);
3088 result->value.character.length = 0;
3089 result->value.character.string[0] = '\0';
3093 result->value.character.length = nlen;
3094 result->value.character.string = gfc_getmem (nlen + 1);
3096 for (i = 0; i < ncop; i++)
3097 for (j = 0; j < len; j++)
3098 result->value.character.string[j + i * len]
3099 = e->value.character.string[j];
3101 result->value.character.string[nlen] = '\0'; /* For debugger */
3106 /* This one is a bear, but mainly has to do with shuffling elements. */
3109 gfc_simplify_reshape (gfc_expr *source, gfc_expr *shape_exp,
3110 gfc_expr *pad, gfc_expr *order_exp)
3112 int order[GFC_MAX_DIMENSIONS], shape[GFC_MAX_DIMENSIONS];
3113 int i, rank, npad, x[GFC_MAX_DIMENSIONS];
3114 gfc_constructor *head, *tail;
3120 /* Unpack the shape array. */
3121 if (source->expr_type != EXPR_ARRAY || !gfc_is_constant_expr (source))
3124 if (shape_exp->expr_type != EXPR_ARRAY || !gfc_is_constant_expr (shape_exp))
3128 && (pad->expr_type != EXPR_ARRAY || !gfc_is_constant_expr (pad)))
3131 if (order_exp != NULL
3132 && (order_exp->expr_type != EXPR_ARRAY
3133 || !gfc_is_constant_expr (order_exp)))
3142 e = gfc_get_array_element (shape_exp, rank);
3146 if (gfc_extract_int (e, &shape[rank]) != NULL)
3148 gfc_error ("Integer too large in shape specification at %L",
3156 if (rank >= GFC_MAX_DIMENSIONS)
3158 gfc_error ("Too many dimensions in shape specification for RESHAPE "
3159 "at %L", &e->where);
3164 if (shape[rank] < 0)
3166 gfc_error ("Shape specification at %L cannot be negative",
3176 gfc_error ("Shape specification at %L cannot be the null array",
3181 /* Now unpack the order array if present. */
3182 if (order_exp == NULL)
3184 for (i = 0; i < rank; i++)
3189 for (i = 0; i < rank; i++)
3192 for (i = 0; i < rank; i++)
3194 e = gfc_get_array_element (order_exp, i);
3197 gfc_error ("ORDER parameter of RESHAPE at %L is not the same "
3198 "size as SHAPE parameter", &order_exp->where);
3202 if (gfc_extract_int (e, &order[i]) != NULL)
3204 gfc_error ("Error in ORDER parameter of RESHAPE at %L",
3212 if (order[i] < 1 || order[i] > rank)
3214 gfc_error ("ORDER parameter of RESHAPE at %L is out of range",
3223 gfc_error ("Invalid permutation in ORDER parameter at %L",
3232 /* Count the elements in the source and padding arrays. */
3237 gfc_array_size (pad, &size);
3238 npad = mpz_get_ui (size);
3242 gfc_array_size (source, &size);
3243 nsource = mpz_get_ui (size);
3246 /* If it weren't for that pesky permutation we could just loop
3247 through the source and round out any shortage with pad elements.
3248 But no, someone just had to have the compiler do something the
3249 user should be doing. */
3251 for (i = 0; i < rank; i++)
3256 /* Figure out which element to extract. */
3257 mpz_set_ui (index, 0);
3259 for (i = rank - 1; i >= 0; i--)
3261 mpz_add_ui (index, index, x[order[i]]);
3263 mpz_mul_ui (index, index, shape[order[i - 1]]);
3266 if (mpz_cmp_ui (index, INT_MAX) > 0)
3267 gfc_internal_error ("Reshaped array too large at %L", &e->where);
3269 j = mpz_get_ui (index);
3272 e = gfc_get_array_element (source, j);
3279 gfc_error ("PAD parameter required for short SOURCE parameter "
3280 "at %L", &source->where);
3285 e = gfc_get_array_element (pad, j);
3289 head = tail = gfc_get_constructor ();
3292 tail->next = gfc_get_constructor ();
3299 tail->where = e->where;
3302 /* Calculate the next element. */
3306 if (++x[i] < shape[i])
3317 e = gfc_get_expr ();
3318 e->where = source->where;
3319 e->expr_type = EXPR_ARRAY;
3320 e->value.constructor = head;
3321 e->shape = gfc_get_shape (rank);
3323 for (i = 0; i < rank; i++)
3324 mpz_init_set_ui (e->shape[i], shape[i]);
3332 gfc_free_constructor (head);
3334 return &gfc_bad_expr;
3339 gfc_simplify_rrspacing (gfc_expr *x)
3345 if (x->expr_type != EXPR_CONSTANT)
3348 i = gfc_validate_kind (x->ts.type, x->ts.kind, false);
3350 result = gfc_constant_result (BT_REAL, x->ts.kind, &x->where);
3352 mpfr_abs (result->value.real, x->value.real, GFC_RND_MODE);
3354 /* Special case x = -0 and 0. */
3355 if (mpfr_sgn (result->value.real) == 0)
3357 mpfr_set_ui (result->value.real, 0, GFC_RND_MODE);
3361 /* | x * 2**(-e) | * 2**p. */
3362 e = - (long int) mpfr_get_exp (x->value.real);
3363 mpfr_mul_2si (result->value.real, result->value.real, e, GFC_RND_MODE);
3365 p = (long int) gfc_real_kinds[i].digits;
3366 mpfr_mul_2si (result->value.real, result->value.real, p, GFC_RND_MODE);
3368 return range_check (result, "RRSPACING");
3373 gfc_simplify_scale (gfc_expr *x, gfc_expr *i)
3375 int k, neg_flag, power, exp_range;
3376 mpfr_t scale, radix;
3379 if (x->expr_type != EXPR_CONSTANT || i->expr_type != EXPR_CONSTANT)
3382 result = gfc_constant_result (BT_REAL, x->ts.kind, &x->where);
3384 if (mpfr_sgn (x->value.real) == 0)
3386 mpfr_set_ui (result->value.real, 0, GFC_RND_MODE);
3390 k = gfc_validate_kind (BT_REAL, x->ts.kind, false);
3392 exp_range = gfc_real_kinds[k].max_exponent - gfc_real_kinds[k].min_exponent;
3394 /* This check filters out values of i that would overflow an int. */
3395 if (mpz_cmp_si (i->value.integer, exp_range + 2) > 0
3396 || mpz_cmp_si (i->value.integer, -exp_range - 2) < 0)
3398 gfc_error ("Result of SCALE overflows its kind at %L", &result->where);
3399 return &gfc_bad_expr;
3402 /* Compute scale = radix ** power. */
3403 power = mpz_get_si (i->value.integer);
3413 gfc_set_model_kind (x->ts.kind);
3416 mpfr_set_ui (radix, gfc_real_kinds[k].radix, GFC_RND_MODE);
3417 mpfr_pow_ui (scale, radix, power, GFC_RND_MODE);
3420 mpfr_div (result->value.real, x->value.real, scale, GFC_RND_MODE);
3422 mpfr_mul (result->value.real, x->value.real, scale, GFC_RND_MODE);
3427 return range_check (result, "SCALE");
3432 gfc_simplify_scan (gfc_expr *e, gfc_expr *c, gfc_expr *b, gfc_expr *kind)
3437 size_t indx, len, lenc;
3438 int k = get_kind (BT_INTEGER, kind, "SCAN", gfc_default_integer_kind);
3441 return &gfc_bad_expr;
3443 if (e->expr_type != EXPR_CONSTANT || c->expr_type != EXPR_CONSTANT)
3446 if (b != NULL && b->value.logical != 0)
3451 result = gfc_constant_result (BT_INTEGER, k, &e->where);
3453 len = e->value.character.length;
3454 lenc = c->value.character.length;
3456 if (len == 0 || lenc == 0)
3464 indx = strcspn (e->value.character.string, c->value.character.string)
3472 for (indx = len; indx > 0; indx--)
3474 for (i = 0; i < lenc; i++)
3476 if (c->value.character.string[i]
3477 == e->value.character.string[indx - 1])
3485 mpz_set_ui (result->value.integer, indx);
3486 return range_check (result, "SCAN");
3491 gfc_simplify_selected_int_kind (gfc_expr *e)
3496 if (e->expr_type != EXPR_CONSTANT || gfc_extract_int (e, &range) != NULL)
3501 for (i = 0; gfc_integer_kinds[i].kind != 0; i++)
3502 if (gfc_integer_kinds[i].range >= range
3503 && gfc_integer_kinds[i].kind < kind)
3504 kind = gfc_integer_kinds[i].kind;
3506 if (kind == INT_MAX)
3509 result = gfc_int_expr (kind);
3510 result->where = e->where;
3517 gfc_simplify_selected_real_kind (gfc_expr *p, gfc_expr *q)
3519 int range, precision, i, kind, found_precision, found_range;
3526 if (p->expr_type != EXPR_CONSTANT
3527 || gfc_extract_int (p, &precision) != NULL)
3535 if (q->expr_type != EXPR_CONSTANT
3536 || gfc_extract_int (q, &range) != NULL)
3541 found_precision = 0;
3544 for (i = 0; gfc_real_kinds[i].kind != 0; i++)
3546 if (gfc_real_kinds[i].precision >= precision)
3547 found_precision = 1;
3549 if (gfc_real_kinds[i].range >= range)
3552 if (gfc_real_kinds[i].precision >= precision
3553 && gfc_real_kinds[i].range >= range && gfc_real_kinds[i].kind < kind)
3554 kind = gfc_real_kinds[i].kind;
3557 if (kind == INT_MAX)
3561 if (!found_precision)
3567 result = gfc_int_expr (kind);
3568 result->where = (p != NULL) ? p->where : q->where;
3575 gfc_simplify_set_exponent (gfc_expr *x, gfc_expr *i)
3578 mpfr_t exp, absv, log2, pow2, frac;
3581 if (x->expr_type != EXPR_CONSTANT || i->expr_type != EXPR_CONSTANT)
3584 result = gfc_constant_result (BT_REAL, x->ts.kind, &x->where);
3586 gfc_set_model_kind (x->ts.kind);
3588 if (mpfr_sgn (x->value.real) == 0)
3590 mpfr_set_ui (result->value.real, 0, GFC_RND_MODE);
3600 mpfr_abs (absv, x->value.real, GFC_RND_MODE);
3601 mpfr_log2 (log2, absv, GFC_RND_MODE);
3603 mpfr_trunc (log2, log2);
3604 mpfr_add_ui (exp, log2, 1, GFC_RND_MODE);
3606 /* Old exponent value, and fraction. */
3607 mpfr_ui_pow (pow2, 2, exp, GFC_RND_MODE);
3609 mpfr_div (frac, absv, pow2, GFC_RND_MODE);
3612 exp2 = (unsigned long) mpz_get_d (i->value.integer);
3613 mpfr_mul_2exp (result->value.real, frac, exp2, GFC_RND_MODE);
3620 return range_check (result, "SET_EXPONENT");
3625 gfc_simplify_shape (gfc_expr *source)
3627 mpz_t shape[GFC_MAX_DIMENSIONS];
3628 gfc_expr *result, *e, *f;
3633 if (source->rank == 0 || source->expr_type != EXPR_VARIABLE)
3636 result = gfc_start_constructor (BT_INTEGER, gfc_default_integer_kind,
3639 ar = gfc_find_array_ref (source);
3641 t = gfc_array_ref_shape (ar, shape);
3643 for (n = 0; n < source->rank; n++)
3645 e = gfc_constant_result (BT_INTEGER, gfc_default_integer_kind,
3650 mpz_set (e->value.integer, shape[n]);
3651 mpz_clear (shape[n]);
3655 mpz_set_ui (e->value.integer, n + 1);
3657 f = gfc_simplify_size (source, e, NULL);
3661 gfc_free_expr (result);
3670 gfc_append_constructor (result, e);
3678 gfc_simplify_size (gfc_expr *array, gfc_expr *dim, gfc_expr *kind)
3683 int k = get_kind (BT_INTEGER, kind, "SIZE", gfc_default_integer_kind);
3686 return &gfc_bad_expr;
3690 if (gfc_array_size (array, &size) == FAILURE)
3695 if (dim->expr_type != EXPR_CONSTANT)
3698 d = mpz_get_ui (dim->value.integer) - 1;
3699 if (gfc_array_dimen_size (array, d, &size) == FAILURE)
3703 result = gfc_constant_result (BT_INTEGER, k, &array->where);
3704 mpz_set (result->value.integer, size);
3710 gfc_simplify_sign (gfc_expr *x, gfc_expr *y)
3714 if (x->expr_type != EXPR_CONSTANT || y->expr_type != EXPR_CONSTANT)
3717 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
3722 mpz_abs (result->value.integer, x->value.integer);
3723 if (mpz_sgn (y->value.integer) < 0)
3724 mpz_neg (result->value.integer, result->value.integer);
3729 /* TODO: Handle -0.0 and +0.0 correctly on machines that support
3731 mpfr_abs (result->value.real, x->value.real, GFC_RND_MODE);
3732 if (mpfr_sgn (y->value.real) < 0)
3733 mpfr_neg (result->value.real, result->value.real, GFC_RND_MODE);
3738 gfc_internal_error ("Bad type in gfc_simplify_sign");
3746 gfc_simplify_sin (gfc_expr *x)
3751 if (x->expr_type != EXPR_CONSTANT)
3754 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
3759 mpfr_sin (result->value.real, x->value.real, GFC_RND_MODE);
3763 gfc_set_model (x->value.real);
3767 mpfr_sin (xp, x->value.complex.r, GFC_RND_MODE);
3768 mpfr_cosh (xq, x->value.complex.i, GFC_RND_MODE);
3769 mpfr_mul (result->value.complex.r, xp, xq, GFC_RND_MODE);
3771 mpfr_cos (xp, x->value.complex.r, GFC_RND_MODE);
3772 mpfr_sinh (xq, x->value.complex.i, GFC_RND_MODE);
3773 mpfr_mul (result->value.complex.i, xp, xq, GFC_RND_MODE);
3780 gfc_internal_error ("in gfc_simplify_sin(): Bad type");
3783 return range_check (result, "SIN");
3788 gfc_simplify_sinh (gfc_expr *x)
3792 if (x->expr_type != EXPR_CONSTANT)
3795 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
3797 mpfr_sinh (result->value.real, x->value.real, GFC_RND_MODE);
3799 return range_check (result, "SINH");
3803 /* The argument is always a double precision real that is converted to
3804 single precision. TODO: Rounding! */
3807 gfc_simplify_sngl (gfc_expr *a)
3811 if (a->expr_type != EXPR_CONSTANT)
3814 result = gfc_real2real (a, gfc_default_real_kind);
3815 return range_check (result, "SNGL");
3820 gfc_simplify_spacing (gfc_expr *x)
3826 if (x->expr_type != EXPR_CONSTANT)
3829 i = gfc_validate_kind (x->ts.type, x->ts.kind, false);
3831 result = gfc_constant_result (BT_REAL, x->ts.kind, &x->where);
3833 /* Special case x = 0 and -0. */
3834 mpfr_abs (result->value.real, x->value.real, GFC_RND_MODE);
3835 if (mpfr_sgn (result->value.real) == 0)
3837 mpfr_set (result->value.real, gfc_real_kinds[i].tiny, GFC_RND_MODE);
3841 /* In the Fortran 95 standard, the result is b**(e - p) where b, e, and p
3842 are the radix, exponent of x, and precision. This excludes the
3843 possibility of subnormal numbers. Fortran 2003 states the result is
3844 b**max(e - p, emin - 1). */
3846 ep = (long int) mpfr_get_exp (x->value.real) - gfc_real_kinds[i].digits;
3847 en = (long int) gfc_real_kinds[i].min_exponent - 1;
3848 en = en > ep ? en : ep;
3850 mpfr_set_ui (result->value.real, 1, GFC_RND_MODE);
3851 mpfr_mul_2si (result->value.real, result->value.real, en, GFC_RND_MODE);
3853 return range_check (result, "SPACING");
3858 gfc_simplify_sqrt (gfc_expr *e)
3861 mpfr_t ac, ad, s, t, w;
3863 if (e->expr_type != EXPR_CONSTANT)
3866 result = gfc_constant_result (e->ts.type, e->ts.kind, &e->where);
3871 if (mpfr_cmp_si (e->value.real, 0) < 0)
3873 mpfr_sqrt (result->value.real, e->value.real, GFC_RND_MODE);
3878 /* Formula taken from Numerical Recipes to avoid over- and
3881 gfc_set_model (e->value.real);
3888 if (mpfr_cmp_ui (e->value.complex.r, 0) == 0
3889 && mpfr_cmp_ui (e->value.complex.i, 0) == 0)
3891 mpfr_set_ui (result->value.complex.r, 0, GFC_RND_MODE);
3892 mpfr_set_ui (result->value.complex.i, 0, GFC_RND_MODE);
3896 mpfr_abs (ac, e->value.complex.r, GFC_RND_MODE);
3897 mpfr_abs (ad, e->value.complex.i, GFC_RND_MODE);
3899 if (mpfr_cmp (ac, ad) >= 0)
3901 mpfr_div (t, e->value.complex.i, e->value.complex.r, GFC_RND_MODE);
3902 mpfr_mul (t, t, t, GFC_RND_MODE);
3903 mpfr_add_ui (t, t, 1, GFC_RND_MODE);
3904 mpfr_sqrt (t, t, GFC_RND_MODE);
3905 mpfr_add_ui (t, t, 1, GFC_RND_MODE);
3906 mpfr_div_ui (t, t, 2, GFC_RND_MODE);
3907 mpfr_sqrt (t, t, GFC_RND_MODE);
3908 mpfr_sqrt (s, ac, GFC_RND_MODE);
3909 mpfr_mul (w, s, t, GFC_RND_MODE);
3913 mpfr_div (s, e->value.complex.r, e->value.complex.i, GFC_RND_MODE);
3914 mpfr_mul (t, s, s, GFC_RND_MODE);
3915 mpfr_add_ui (t, t, 1, GFC_RND_MODE);
3916 mpfr_sqrt (t, t, GFC_RND_MODE);
3917 mpfr_abs (s, s, GFC_RND_MODE);
3918 mpfr_add (t, t, s, GFC_RND_MODE);
3919 mpfr_div_ui (t, t, 2, GFC_RND_MODE);
3920 mpfr_sqrt (t, t, GFC_RND_MODE);
3921 mpfr_sqrt (s, ad, GFC_RND_MODE);
3922 mpfr_mul (w, s, t, GFC_RND_MODE);
3925 if (mpfr_cmp_ui (w, 0) != 0 && mpfr_cmp_ui (e->value.complex.r, 0) >= 0)
3927 mpfr_mul_ui (t, w, 2, GFC_RND_MODE);
3928 mpfr_div (result->value.complex.i, e->value.complex.i, t, GFC_RND_MODE);
3929 mpfr_set (result->value.complex.r, w, GFC_RND_MODE);
3931 else if (mpfr_cmp_ui (w, 0) != 0
3932 && mpfr_cmp_ui (e->value.complex.r, 0) < 0
3933 && mpfr_cmp_ui (e->value.complex.i, 0) >= 0)
3935 mpfr_mul_ui (t, w, 2, GFC_RND_MODE);
3936 mpfr_div (result->value.complex.r, e->value.complex.i, t, GFC_RND_MODE);
3937 mpfr_set (result->value.complex.i, w, GFC_RND_MODE);
3939 else if (mpfr_cmp_ui (w, 0) != 0
3940 && mpfr_cmp_ui (e->value.complex.r, 0) < 0
3941 && mpfr_cmp_ui (e->value.complex.i, 0) < 0)
3943 mpfr_mul_ui (t, w, 2, GFC_RND_MODE);
3944 mpfr_div (result->value.complex.r, ad, t, GFC_RND_MODE);
3945 mpfr_neg (w, w, GFC_RND_MODE);
3946 mpfr_set (result->value.complex.i, w, GFC_RND_MODE);
3949 gfc_internal_error ("invalid complex argument of SQRT at %L",
3961 gfc_internal_error ("invalid argument of SQRT at %L", &e->where);
3964 return range_check (result, "SQRT");
3967 gfc_free_expr (result);
3968 gfc_error ("Argument of SQRT at %L has a negative value", &e->where);
3969 return &gfc_bad_expr;
3974 gfc_simplify_tan (gfc_expr *x)
3979 if (x->expr_type != EXPR_CONSTANT)
3982 i = gfc_validate_kind (BT_REAL, x->ts.kind, false);
3984 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
3986 mpfr_tan (result->value.real, x->value.real, GFC_RND_MODE);
3988 return range_check (result, "TAN");
3993 gfc_simplify_tanh (gfc_expr *x)
3997 if (x->expr_type != EXPR_CONSTANT)
4000 result = gfc_constant_result (x->ts.type, x->ts.kind, &x->where);
4002 mpfr_tanh (result->value.real, x->value.real, GFC_RND_MODE);
4004 return range_check (result, "TANH");
4010 gfc_simplify_tiny (gfc_expr *e)
4015 i = gfc_validate_kind (BT_REAL, e->ts.kind, false);
4017 result = gfc_constant_result (BT_REAL, e->ts.kind, &e->where);
4018 mpfr_set (result->value.real, gfc_real_kinds[i].tiny, GFC_RND_MODE);
4025 gfc_simplify_transfer (gfc_expr *source, gfc_expr *mold, gfc_expr *size)
4028 gfc_expr *mold_element;
4031 size_t result_elt_size;
4034 unsigned char *buffer;
4036 if (!gfc_is_constant_expr (source)
4037 || !gfc_is_constant_expr (size))
4040 if (source->expr_type == EXPR_FUNCTION)
4043 /* Calculate the size of the source. */
4044 if (source->expr_type == EXPR_ARRAY
4045 && gfc_array_size (source, &tmp) == FAILURE)
4046 gfc_internal_error ("Failure getting length of a constant array.");
4048 source_size = gfc_target_expr_size (source);
4050 /* Create an empty new expression with the appropriate characteristics. */
4051 result = gfc_constant_result (mold->ts.type, mold->ts.kind,
4053 result->ts = mold->ts;
4055 mold_element = mold->expr_type == EXPR_ARRAY
4056 ? mold->value.constructor->expr
4059 /* Set result character length, if needed. Note that this needs to be
4060 set even for array expressions, in order to pass this information into
4061 gfc_target_interpret_expr. */
4062 if (result->ts.type == BT_CHARACTER)
4063 result->value.character.length = mold_element->value.character.length;
4065 /* Set the number of elements in the result, and determine its size. */
4066 result_elt_size = gfc_target_expr_size (mold_element);
4067 if (mold->expr_type == EXPR_ARRAY || mold->rank || size)
4071 result->expr_type = EXPR_ARRAY;
4075 result_length = (size_t)mpz_get_ui (size->value.integer);
4078 result_length = source_size / result_elt_size;
4079 if (result_length * result_elt_size < source_size)
4083 result->shape = gfc_get_shape (1);
4084 mpz_init_set_ui (result->shape[0], result_length);
4086 result_size = result_length * result_elt_size;
4091 result_size = result_elt_size;
4094 if (gfc_option.warn_surprising && source_size < result_size)
4095 gfc_warning("Intrinsic TRANSFER at %L has partly undefined result: "
4096 "source size %ld < result size %ld", &source->where,
4097 (long) source_size, (long) result_size);
4099 /* Allocate the buffer to store the binary version of the source. */
4100 buffer_size = MAX (source_size, result_size);
4101 buffer = (unsigned char*)alloca (buffer_size);
4103 /* Now write source to the buffer. */
4104 gfc_target_encode_expr (source, buffer, buffer_size);
4106 /* And read the buffer back into the new expression. */
4107 gfc_target_interpret_expr (buffer, buffer_size, result);
4114 gfc_simplify_trim (gfc_expr *e)
4117 int count, i, len, lentrim;
4119 if (e->expr_type != EXPR_CONSTANT)
4122 len = e->value.character.length;
4124 result = gfc_constant_result (BT_CHARACTER, e->ts.kind, &e->where);
4126 for (count = 0, i = 1; i <= len; ++i)
4128 if (e->value.character.string[len - i] == ' ')
4134 lentrim = len - count;
4136 result->value.character.length = lentrim;
4137 result->value.character.string = gfc_getmem (lentrim + 1);
4139 for (i = 0; i < lentrim; i++)
4140 result->value.character.string[i] = e->value.character.string[i];
4142 result->value.character.string[lentrim] = '\0'; /* For debugger */
4149 gfc_simplify_ubound (gfc_expr *array, gfc_expr *dim, gfc_expr *kind)
4151 return simplify_bound (array, dim, kind, 1);
4156 gfc_simplify_verify (gfc_expr *s, gfc_expr *set, gfc_expr *b, gfc_expr *kind)
4160 size_t index, len, lenset;
4162 int k = get_kind (BT_INTEGER, kind, "VERIFY", gfc_default_integer_kind);
4165 return &gfc_bad_expr;
4167 if (s->expr_type != EXPR_CONSTANT || set->expr_type != EXPR_CONSTANT)
4170 if (b != NULL && b->value.logical != 0)
4175 result = gfc_constant_result (BT_INTEGER, k, &s->where);
4177 len = s->value.character.length;
4178 lenset = set->value.character.length;
4182 mpz_set_ui (result->value.integer, 0);
4190 mpz_set_ui (result->value.integer, 1);
4194 index = strspn (s->value.character.string, set->value.character.string)
4204 mpz_set_ui (result->value.integer, len);
4207 for (index = len; index > 0; index --)
4209 for (i = 0; i < lenset; i++)
4211 if (s->value.character.string[index - 1]
4212 == set->value.character.string[i])
4220 mpz_set_ui (result->value.integer, index);
4226 gfc_simplify_xor (gfc_expr *x, gfc_expr *y)
4231 if (x->expr_type != EXPR_CONSTANT || y->expr_type != EXPR_CONSTANT)
4234 kind = x->ts.kind > y->ts.kind ? x->ts.kind : y->ts.kind;
4235 if (x->ts.type == BT_INTEGER)
4237 result = gfc_constant_result (BT_INTEGER, kind, &x->where);
4238 mpz_xor (result->value.integer, x->value.integer, y->value.integer);
4240 else /* BT_LOGICAL */
4242 result = gfc_constant_result (BT_LOGICAL, kind, &x->where);
4243 result->value.logical = (x->value.logical && !y->value.logical)
4244 || (!x->value.logical && y->value.logical);
4247 return range_check (result, "XOR");
4251 /****************** Constant simplification *****************/
4253 /* Master function to convert one constant to another. While this is
4254 used as a simplification function, it requires the destination type
4255 and kind information which is supplied by a special case in
4259 gfc_convert_constant (gfc_expr *e, bt type, int kind)
4261 gfc_expr *g, *result, *(*f) (gfc_expr *, int);
4262 gfc_constructor *head, *c, *tail = NULL;
4276 f = gfc_int2complex;
4296 f = gfc_real2complex;
4307 f = gfc_complex2int;
4310 f = gfc_complex2real;
4313 f = gfc_complex2complex;
4339 f = gfc_hollerith2int;
4343 f = gfc_hollerith2real;
4347 f = gfc_hollerith2complex;
4351 f = gfc_hollerith2character;
4355 f = gfc_hollerith2logical;
4365 gfc_internal_error ("gfc_convert_constant(): Unexpected type");
4370 switch (e->expr_type)
4373 result = f (e, kind);
4375 return &gfc_bad_expr;
4379 if (!gfc_is_constant_expr (e))
4384 for (c = e->value.constructor; c; c = c->next)
4387 head = tail = gfc_get_constructor ();
4390 tail->next = gfc_get_constructor ();
4394 tail->where = c->where;
4396 if (c->iterator == NULL)
4397 tail->expr = f (c->expr, kind);
4400 g = gfc_convert_constant (c->expr, type, kind);
4401 if (g == &gfc_bad_expr)
4406 if (tail->expr == NULL)
4408 gfc_free_constructor (head);
4413 result = gfc_get_expr ();
4414 result->ts.type = type;
4415 result->ts.kind = kind;
4416 result->expr_type = EXPR_ARRAY;
4417 result->value.constructor = head;
4418 result->shape = gfc_copy_shape (e->shape, e->rank);
4419 result->where = e->where;
4420 result->rank = e->rank;