1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2009, Free Software Foundation, Inc. *
11 * GNAT is free software; you can redistribute it and/or modify it under *
12 * terms of the GNU General Public License as published by the Free Soft- *
13 * ware Foundation; either version 3, or (at your option) any later ver- *
14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
17 * for more details. You should have received a copy of the GNU General *
18 * Public License distributed with GNAT; see file COPYING3. If not see *
19 * <http://www.gnu.org/licenses/>. *
21 * GNAT was originally developed by the GNAT team at New York University. *
22 * Extensive contributions were provided by Ada Core Technologies Inc. *
24 ****************************************************************************/
26 /* This file contains parts of the compiler that are required for interfacing
27 with GCC but otherwise do nothing and parts of Gigi that need to know
32 #include "coretypes.h"
35 #include "diagnostic.h"
46 #include "langhooks.h"
47 #include "langhooks-def.h"
50 #include "tree-inline.h"
53 #include "adadecode.h"
67 static bool gnat_init (void);
68 static unsigned int gnat_init_options (unsigned int, const char **);
69 static int gnat_handle_option (size_t, const char *, int);
70 static bool gnat_post_options (const char **);
71 static alias_set_type
gnat_get_alias_set (tree
);
72 static void gnat_print_decl (FILE *, tree
, int);
73 static void gnat_print_type (FILE *, tree
, int);
74 static const char *gnat_printable_name (tree
, int);
75 static const char *gnat_dwarf_name (tree
, int);
76 static tree
gnat_return_tree (tree
);
77 static int gnat_eh_type_covers (tree
, tree
);
78 static void gnat_parse_file (int);
79 static void internal_error_function (const char *, va_list *);
80 static tree
gnat_type_max_size (const_tree
);
82 /* Definitions for our language-specific hooks. */
84 #undef LANG_HOOKS_NAME
85 #define LANG_HOOKS_NAME "GNU Ada"
86 #undef LANG_HOOKS_IDENTIFIER_SIZE
87 #define LANG_HOOKS_IDENTIFIER_SIZE sizeof (struct tree_identifier)
88 #undef LANG_HOOKS_INIT
89 #define LANG_HOOKS_INIT gnat_init
90 #undef LANG_HOOKS_INIT_OPTIONS
91 #define LANG_HOOKS_INIT_OPTIONS gnat_init_options
92 #undef LANG_HOOKS_HANDLE_OPTION
93 #define LANG_HOOKS_HANDLE_OPTION gnat_handle_option
94 #undef LANG_HOOKS_POST_OPTIONS
95 #define LANG_HOOKS_POST_OPTIONS gnat_post_options
96 #undef LANG_HOOKS_PARSE_FILE
97 #define LANG_HOOKS_PARSE_FILE gnat_parse_file
98 #undef LANG_HOOKS_HASH_TYPES
99 #define LANG_HOOKS_HASH_TYPES false
100 #undef LANG_HOOKS_GETDECLS
101 #define LANG_HOOKS_GETDECLS lhd_return_null_tree_v
102 #undef LANG_HOOKS_PUSHDECL
103 #define LANG_HOOKS_PUSHDECL gnat_return_tree
104 #undef LANG_HOOKS_WRITE_GLOBALS
105 #define LANG_HOOKS_WRITE_GLOBALS gnat_write_global_declarations
106 #undef LANG_HOOKS_GET_ALIAS_SET
107 #define LANG_HOOKS_GET_ALIAS_SET gnat_get_alias_set
108 #undef LANG_HOOKS_MARK_ADDRESSABLE
109 #define LANG_HOOKS_MARK_ADDRESSABLE gnat_mark_addressable
110 #undef LANG_HOOKS_PRINT_DECL
111 #define LANG_HOOKS_PRINT_DECL gnat_print_decl
112 #undef LANG_HOOKS_PRINT_TYPE
113 #define LANG_HOOKS_PRINT_TYPE gnat_print_type
114 #undef LANG_HOOKS_TYPE_MAX_SIZE
115 #define LANG_HOOKS_TYPE_MAX_SIZE gnat_type_max_size
116 #undef LANG_HOOKS_DECL_PRINTABLE_NAME
117 #define LANG_HOOKS_DECL_PRINTABLE_NAME gnat_printable_name
118 #undef LANG_HOOKS_DWARF_NAME
119 #define LANG_HOOKS_DWARF_NAME gnat_dwarf_name
120 #undef LANG_HOOKS_GIMPLIFY_EXPR
121 #define LANG_HOOKS_GIMPLIFY_EXPR gnat_gimplify_expr
122 #undef LANG_HOOKS_TYPE_FOR_MODE
123 #define LANG_HOOKS_TYPE_FOR_MODE gnat_type_for_mode
124 #undef LANG_HOOKS_TYPE_FOR_SIZE
125 #define LANG_HOOKS_TYPE_FOR_SIZE gnat_type_for_size
126 #undef LANG_HOOKS_TYPES_COMPATIBLE_P
127 #define LANG_HOOKS_TYPES_COMPATIBLE_P gnat_types_compatible_p
128 #undef LANG_HOOKS_ATTRIBUTE_TABLE
129 #define LANG_HOOKS_ATTRIBUTE_TABLE gnat_internal_attribute_table
130 #undef LANG_HOOKS_BUILTIN_FUNCTION
131 #define LANG_HOOKS_BUILTIN_FUNCTION gnat_builtin_function
133 const struct lang_hooks lang_hooks
= LANG_HOOKS_INITIALIZER
;
135 /* How much we want of our DWARF extensions. Some of our dwarf+ extensions
136 are incompatible with regular GDB versions, so we must make sure to only
137 produce them on explicit request. This is eventually reflected into the
138 use_gnu_debug_info_extensions common flag for later processing. */
139 static int gnat_dwarf_extensions
= 0;
141 /* Command-line argc and argv. These variables are global
142 since they are imported in back_end.adb. */
143 unsigned int save_argc
;
144 const char **save_argv
;
146 /* GNAT argc and argv. */
147 extern int gnat_argc
;
148 extern char **gnat_argv
;
151 /* Declare functions we use as part of startup. */
152 extern void __gnat_initialize (void *);
153 extern void __gnat_install_SEH_handler (void *);
154 extern void adainit (void);
155 extern void _ada_gnat1drv (void);
157 /* The parser for the language. For us, we process the GNAT tree. */
160 gnat_parse_file (int set_yydebug ATTRIBUTE_UNUSED
)
164 /* Call the target specific initializations. */
165 __gnat_initialize (NULL
);
167 /* ??? Call the SEH initialization routine. This is to workaround
168 a bootstrap path problem. The call below should be removed at some
169 point and the SEH pointer passed to __gnat_initialize() above. */
170 __gnat_install_SEH_handler((void *)seh
);
172 /* Call the front-end elaboration procedures. */
175 /* Call the front end. */
178 /* We always have a single compilation unit in Ada. */
179 cgraph_finalize_compilation_unit ();
182 /* Decode all the language specific options that cannot be decoded by GCC.
183 The option decoding phase of GCC calls this routine on the flags that
184 it cannot decode. Return the number of consecutive arguments from ARGV
185 that have been successfully decoded or 0 on failure. */
188 gnat_handle_option (size_t scode
, const char *arg
, int value
)
190 const struct cl_option
*option
= &cl_options
[scode
];
191 enum opt_code code
= (enum opt_code
) scode
;
194 if (arg
== NULL
&& (option
->flags
& (CL_JOINED
| CL_SEPARATE
)))
196 error ("missing argument to \"-%s\"", option
->opt_text
);
203 q
= XNEWVEC (char, sizeof("-I") + strlen (arg
));
206 gnat_argv
[gnat_argc
] = q
;
213 /* We save the value of warn_uninitialized, since if they put
214 -Wuninitialized on the command line, we need to generate a
215 warning about not using it without also specifying -O. */
216 if (warn_uninitialized
!= 1)
217 warn_uninitialized
= (value
? 2 : 0);
220 /* These are used in the GCC Makefile. */
221 case OPT_Wmissing_prototypes
:
222 case OPT_Wstrict_prototypes
:
223 case OPT_Wwrite_strings
:
225 case OPT_Wvariadic_macros
:
226 case OPT_Wold_style_definition
:
227 case OPT_Wmissing_format_attribute
:
228 case OPT_Woverlength_strings
:
231 /* This is handled by the front-end. */
236 gnat_argv
[gnat_argc
] = xstrdup ("-nostdlib");
240 case OPT_feliminate_unused_debug_types
:
241 /* We arrange for post_option to be able to only set the corresponding
242 flag to 1 when explicitly requested by the user. We expect the
243 default flag value to be either 0 or positive, and expose a positive
244 -f as a negative value to post_option. */
245 flag_eliminate_unused_debug_types
= -value
;
249 gnat_argv
[gnat_argc
] = xstrdup ("-fRTS");
254 warning (0, "%<-gnat%> misspelled as %<-gant%>");
256 /* ... fall through ... */
259 /* Recopy the switches without the 'gnat' prefix. */
260 gnat_argv
[gnat_argc
] = XNEWVEC (char, strlen (arg
) + 2);
261 gnat_argv
[gnat_argc
][0] = '-';
262 strcpy (gnat_argv
[gnat_argc
] + 1, arg
);
267 gnat_argv
[gnat_argc
] = xstrdup ("-O");
269 gnat_argv
[gnat_argc
] = xstrdup (arg
);
274 gnat_dwarf_extensions
++;
284 /* Initialize for option processing. */
287 gnat_init_options (unsigned int argc
, const char **argv
)
289 /* Initialize gnat_argv with save_argv size. */
290 gnat_argv
= (char **) xmalloc ((argc
+ 1) * sizeof (argv
[0]));
291 gnat_argv
[0] = xstrdup (argv
[0]); /* name of the command */
297 /* Uninitialized really means uninitialized in Ada. */
298 flag_zero_initialized_in_bss
= 0;
303 /* Post-switch processing. */
306 gnat_post_options (const char **pfilename ATTRIBUTE_UNUSED
)
308 /* Excess precision other than "fast" requires front-end
310 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_STANDARD
311 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT
)
312 sorry ("-fexcess-precision=standard for Ada");
313 flag_excess_precision_cmdline
= EXCESS_PRECISION_FAST
;
315 /* ??? The warning machinery is outsmarted by Ada. */
316 warn_unused_parameter
= 0;
318 /* No psABI change warnings for Ada. */
321 /* Force eliminate_unused_debug_types to 0 unless an explicit positive
322 -f has been passed. This forces the default to 0 for Ada, which might
323 differ from the common default. */
324 if (flag_eliminate_unused_debug_types
< 0)
325 flag_eliminate_unused_debug_types
= 1;
327 flag_eliminate_unused_debug_types
= 0;
329 /* Reflect the explicit request of DWARF extensions into the common
330 flag for use by later passes. */
331 if (write_symbols
== DWARF2_DEBUG
)
332 use_gnu_debug_info_extensions
= gnat_dwarf_extensions
> 0;
337 /* Here is the function to handle the compiler error processing in GCC. */
340 internal_error_function (const char *msgid
, va_list *ap
)
343 char *buffer
, *p
, *loc
;
344 String_Template temp
, temp_loc
;
345 Fat_Pointer fp
, fp_loc
;
348 /* Reset the pretty-printer. */
349 pp_clear_output_area (global_dc
->printer
);
351 /* Format the message into the pretty-printer. */
352 tinfo
.format_spec
= msgid
;
354 tinfo
.err_no
= errno
;
355 pp_format_verbatim (global_dc
->printer
, &tinfo
);
357 /* Extract a (writable) pointer to the formatted text. */
358 buffer
= (char*) pp_formatted_text (global_dc
->printer
);
360 /* Go up to the first newline. */
361 for (p
= buffer
; *p
; p
++)
369 temp
.High_Bound
= p
- buffer
;
373 s
= expand_location (input_location
);
374 if (flag_show_column
&& s
.column
!= 0)
375 asprintf (&loc
, "%s:%d:%d", s
.file
, s
.line
, s
.column
);
377 asprintf (&loc
, "%s:%d", s
.file
, s
.line
);
378 temp_loc
.Low_Bound
= 1;
379 temp_loc
.High_Bound
= strlen (loc
);
380 fp_loc
.Bounds
= &temp_loc
;
383 Current_Error_Node
= error_gnat_node
;
384 Compiler_Abort (fp
, -1, fp_loc
);
387 /* Perform all the initialization steps that are language-specific. */
392 /* Performs whatever initialization steps needed by the language-dependent
394 gnat_init_decl_processing ();
396 /* Add the input filename as the last argument. */
397 gnat_argv
[gnat_argc
] = (char *) main_input_filename
;
399 gnat_argv
[gnat_argc
] = 0;
401 global_dc
->internal_error
= &internal_error_function
;
403 /* Show that REFERENCE_TYPEs are internal and should be Pmode. */
404 internal_reference_types ();
409 /* If we are using the GCC mechanism to process exception handling, we
410 have to register the personality routine for Ada and to initialize
411 various language dependent hooks. */
414 gnat_init_gcc_eh (void)
416 #ifdef DWARF2_UNWIND_INFO
417 /* lang_dependent_init already called dwarf2out_frame_init if true. */
418 int dwarf2out_frame_initialized
= dwarf2out_do_frame ();
421 /* We shouldn't do anything if the No_Exceptions_Handler pragma is set,
422 though. This could for instance lead to the emission of tables with
423 references to symbols (such as the Ada eh personality routine) within
424 libraries we won't link against. */
425 if (No_Exception_Handlers_Set ())
428 /* Tell GCC we are handling cleanup actions through exception propagation.
429 This opens possibilities that we don't take advantage of yet, but is
430 nonetheless necessary to ensure that fixup code gets assigned to the
431 right exception regions. */
432 using_eh_for_cleanups ();
434 eh_personality_libfunc
= init_one_libfunc (USING_SJLJ_EXCEPTIONS
435 ? "__gnat_eh_personality_sj"
436 : "__gnat_eh_personality");
437 lang_eh_type_covers
= gnat_eh_type_covers
;
438 lang_eh_runtime_type
= gnat_return_tree
;
439 default_init_unwind_resume_libfunc ();
441 /* Turn on -fexceptions and -fnon-call-exceptions. The first one triggers
442 the generation of the necessary exception runtime tables. The second one
443 is useful for two reasons: 1/ we map some asynchronous signals like SEGV
444 to exceptions, so we need to ensure that the insns which can lead to such
445 signals are correctly attached to the exception region they pertain to,
446 2/ Some calls to pure subprograms are handled as libcall blocks and then
447 marked as "cannot trap" if the flag is not set (see emit_libcall_block).
448 We should not let this be since it is possible for such calls to actually
451 flag_non_call_exceptions
= 1;
454 #ifdef DWARF2_UNWIND_INFO
455 if (!dwarf2out_frame_initialized
&& dwarf2out_do_frame ())
456 dwarf2out_frame_init ();
460 /* Print language-specific items in declaration NODE. */
463 gnat_print_decl (FILE *file
, tree node
, int indent
)
465 switch (TREE_CODE (node
))
468 print_node (file
, "const_corresponding_var",
469 DECL_CONST_CORRESPONDING_VAR (node
), indent
+ 4);
473 print_node (file
, "original_field", DECL_ORIGINAL_FIELD (node
),
478 print_node (file
, "renamed_object", DECL_RENAMED_OBJECT (node
),
487 /* Print language-specific items in type NODE. */
490 gnat_print_type (FILE *file
, tree node
, int indent
)
492 switch (TREE_CODE (node
))
495 print_node (file
, "ci_co_list", TYPE_CI_CO_LIST (node
), indent
+ 4);
499 if (TYPE_MODULAR_P (node
))
500 print_node_brief (file
, "modulus", TYPE_MODULUS (node
), indent
+ 4);
501 else if (TYPE_HAS_ACTUAL_BOUNDS_P (node
))
502 print_node (file
, "actual bounds", TYPE_ACTUAL_BOUNDS (node
),
504 else if (TYPE_VAX_FLOATING_POINT_P (node
))
507 print_node (file
, "index type", TYPE_INDEX_TYPE (node
), indent
+ 4);
509 /* ... fall through ... */
513 print_node_brief (file
, "RM size", TYPE_RM_SIZE (node
), indent
+ 4);
517 print_node (file
,"actual bounds", TYPE_ACTUAL_BOUNDS (node
), indent
+ 4);
521 if (TYPE_IS_FAT_POINTER_P (node
) || TYPE_CONTAINS_TEMPLATE_P (node
))
522 print_node (file
, "unconstrained array",
523 TYPE_UNCONSTRAINED_ARRAY (node
), indent
+ 4);
525 print_node (file
, "Ada size", TYPE_ADA_SIZE (node
), indent
+ 4);
529 case QUAL_UNION_TYPE
:
530 print_node (file
, "Ada size", TYPE_ADA_SIZE (node
), indent
+ 4);
538 /* Return the name to be printed for DECL. */
541 gnat_printable_name (tree decl
, int verbosity
)
543 const char *coded_name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
544 char *ada_name
= (char *) ggc_alloc (strlen (coded_name
) * 2 + 60);
546 __gnat_decode (coded_name
, ada_name
, 0);
548 if (verbosity
== 2 && !DECL_IS_BUILTIN (decl
))
550 Set_Identifier_Casing (ada_name
, (char *) DECL_SOURCE_FILE (decl
));
551 return ggc_strdup (Name_Buffer
);
557 /* Return the name to be used in DWARF debug info for DECL. */
560 gnat_dwarf_name (tree decl
, int verbosity ATTRIBUTE_UNUSED
)
562 gcc_assert (DECL_P (decl
));
563 return (const char *) IDENTIFIER_POINTER (DECL_NAME (decl
));
566 /* Do nothing (return the tree node passed). */
569 gnat_return_tree (tree t
)
574 /* Return true if type A catches type B. Callback for flow analysis from
575 the exception handling part of the back-end. */
578 gnat_eh_type_covers (tree a
, tree b
)
580 /* a catches b if they represent the same exception id or if a
583 ??? integer_zero_node for "others" is hardwired in too many places
585 return (a
== b
|| a
== integer_zero_node
);
588 /* Get the alias set corresponding to a type or expression. */
590 static alias_set_type
591 gnat_get_alias_set (tree type
)
593 /* If this is a padding type, use the type of the first field. */
594 if (TREE_CODE (type
) == RECORD_TYPE
595 && TYPE_IS_PADDING_P (type
))
596 return get_alias_set (TREE_TYPE (TYPE_FIELDS (type
)));
598 /* If the type is an unconstrained array, use the type of the
599 self-referential array we make. */
600 else if (TREE_CODE (type
) == UNCONSTRAINED_ARRAY_TYPE
)
602 get_alias_set (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type
)))));
604 /* If the type can alias any other types, return the alias set 0. */
605 else if (TYPE_P (type
)
606 && TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (type
)))
612 /* GNU_TYPE is a type. Return its maximum size in bytes, if known,
613 as a constant when possible. */
616 gnat_type_max_size (const_tree gnu_type
)
618 /* First see what we can get from TYPE_SIZE_UNIT, which might not
619 be constant even for simple expressions if it has already been
620 elaborated and possibly replaced by a VAR_DECL. */
621 tree max_unitsize
= max_size (TYPE_SIZE_UNIT (gnu_type
), true);
623 /* If we don't have a constant, see what we can get from TYPE_ADA_SIZE,
624 which should stay untouched. */
625 if (!host_integerp (max_unitsize
, 1)
626 && (TREE_CODE (gnu_type
) == RECORD_TYPE
627 || TREE_CODE (gnu_type
) == UNION_TYPE
628 || TREE_CODE (gnu_type
) == QUAL_UNION_TYPE
)
629 && TYPE_ADA_SIZE (gnu_type
))
631 tree max_adasize
= max_size (TYPE_ADA_SIZE (gnu_type
), true);
633 /* If we have succeeded in finding a constant, round it up to the
634 type's alignment and return the result in units. */
635 if (host_integerp (max_adasize
, 1))
637 = size_binop (CEIL_DIV_EXPR
,
638 round_up (max_adasize
, TYPE_ALIGN (gnu_type
)),
645 /* GNU_TYPE is a type. Determine if it should be passed by reference by
649 default_pass_by_ref (tree gnu_type
)
651 /* We pass aggregates by reference if they are sufficiently large. The
652 choice of constant here is somewhat arbitrary. We also pass by
653 reference if the target machine would either pass or return by
654 reference. Strictly speaking, we need only check the return if this
655 is an In Out parameter, but it's probably best to err on the side of
656 passing more things by reference. */
658 if (pass_by_reference (NULL
, TYPE_MODE (gnu_type
), gnu_type
, 1))
661 if (targetm
.calls
.return_in_memory (gnu_type
, NULL_TREE
))
664 if (AGGREGATE_TYPE_P (gnu_type
)
665 && (!host_integerp (TYPE_SIZE (gnu_type
), 1)
666 || 0 < compare_tree_int (TYPE_SIZE (gnu_type
),
667 8 * TYPE_ALIGN (gnu_type
))))
673 /* GNU_TYPE is the type of a subprogram parameter. Determine from the type if
674 it should be passed by reference. */
677 must_pass_by_ref (tree gnu_type
)
679 /* We pass only unconstrained objects, those required by the language
680 to be passed by reference, and objects of variable size. The latter
681 is more efficient, avoids problems with variable size temporaries,
682 and does not produce compatibility problems with C, since C does
683 not have such objects. */
684 return (TREE_CODE (gnu_type
) == UNCONSTRAINED_ARRAY_TYPE
685 || (AGGREGATE_TYPE_P (gnu_type
) && TYPE_BY_REFERENCE_P (gnu_type
))
686 || (TYPE_SIZE (gnu_type
)
687 && TREE_CODE (TYPE_SIZE (gnu_type
)) != INTEGER_CST
));
690 /* This function is called by the front end to enumerate all the supported
691 modes for the machine. We pass a function which is called back with
692 the following integer parameters:
694 FLOAT_P nonzero if this represents a floating-point mode
695 COMPLEX_P nonzero is this represents a complex mode
696 COUNT count of number of items, nonzero for vector mode
697 PRECISION number of bits in data representation
698 MANTISSA number of bits in mantissa, if FP and known, else zero.
699 SIZE number of bits used to store data
700 ALIGN number of bits to which mode is aligned. */
703 enumerate_modes (void (*f
) (int, int, int, int, int, int, unsigned int))
707 for (i
= 0; i
< NUM_MACHINE_MODES
; i
++)
715 enum machine_mode inner_mode
= i
;
717 switch (GET_MODE_CLASS (i
))
724 case MODE_COMPLEX_INT
:
726 inner_mode
= GET_MODE_INNER (i
);
728 case MODE_COMPLEX_FLOAT
:
731 inner_mode
= GET_MODE_INNER (i
);
733 case MODE_VECTOR_INT
:
735 inner_mode
= GET_MODE_INNER (i
);
737 case MODE_VECTOR_FLOAT
:
740 inner_mode
= GET_MODE_INNER (i
);
746 /* Skip this mode if it's one the front end doesn't need to know about
747 (e.g., the CC modes) or if there is no add insn for that mode (or
748 any wider mode), meaning it is not supported by the hardware. If
749 this a complex or vector mode, we care about the inner mode. */
750 for (j
= inner_mode
; j
!= VOIDmode
; j
= GET_MODE_WIDER_MODE (j
))
751 if (optab_handler (add_optab
, j
)->insn_code
!= CODE_FOR_nothing
)
756 const struct real_format
*fmt
= REAL_MODE_FORMAT (inner_mode
);
761 if (!skip_p
&& j
!= VOIDmode
)
762 (*f
) (float_p
, complex_p
, vector_p
? GET_MODE_NUNITS (i
) : 0,
763 GET_MODE_BITSIZE (i
), mantissa
,
764 GET_MODE_SIZE (i
) * BITS_PER_UNIT
, GET_MODE_ALIGNMENT (i
));
768 /* Return the size of the FP mode with precision PREC. */
771 fp_prec_to_size (int prec
)
773 enum machine_mode mode
;
775 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
); mode
!= VOIDmode
;
776 mode
= GET_MODE_WIDER_MODE (mode
))
777 if (GET_MODE_PRECISION (mode
) == prec
)
778 return GET_MODE_BITSIZE (mode
);
783 /* Return the precision of the FP mode with size SIZE. */
786 fp_size_to_prec (int size
)
788 enum machine_mode mode
;
790 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
); mode
!= VOIDmode
;
791 mode
= GET_MODE_WIDER_MODE (mode
))
792 if (GET_MODE_BITSIZE (mode
) == size
)
793 return GET_MODE_PRECISION (mode
);