2 * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief Data modes of operations.
23 * @author Martin Trapp, Christian Schaefer, Goetz Lindenmaier, Mathias Heil,
26 #ifndef FIRM_IR_IRMODE_H
27 #define FIRM_IR_IRMODE_H
29 #include "firm_types.h"
35 * @defgroup ir_mode Value Modes
36 * This module specifies the modes that type the firm nodes. It defines
37 * a datasturcture that describes a mode and implements constructors and
38 * access routines to this datastructure. Further it defines a set of
42 * UKA tech report 1999-44 for more information about modes.
47 * These values represent the different arithmetic operations possible with a
50 typedef enum ir_mode_arithmetic {
51 irma_uninitialized = 0,
52 irma_none = 1, /**< For modes for which no representation is
53 specified. These are modes of sort auxiliary,
54 internal_boolean and character. */
55 irma_twos_complement = 2, /**< Values of the mode are represented as two's
56 complement. Only legal for modes of sort
57 int_number and reference. */
58 irma_ieee754 = 256, /**< Values of the mode are represented according
59 to ieee754 floating point standard. Only
60 legal for modes of sort float_number. */
61 irma_x86_extended_float, /**< x86 extended floatingpoint values */
62 irma_last = irma_x86_extended_float,
68 * @param name the name of the mode to be created
69 * @param arithmetic arithmetic operations possible with a mode
70 * @param bit_size number of bits this mode allocate
71 * @param sign non-zero if this is a signed mode
72 * @param modulo_shift Is ignored for modes other than integer.
74 * This function constructs a new mode given by the parameters.
75 * If the parameters match an already defined mode, this mode is returned
76 * (including the default modes).
79 * The new mode or NULL on error.
81 FIRM_API ir_mode *new_int_mode(const char *name,
82 ir_mode_arithmetic arithmetic,
83 unsigned bit_size, int sign,
84 unsigned modulo_shift);
87 * Create a new reference mode.
89 * Reference modes are always unsigned.
91 FIRM_API ir_mode *new_reference_mode(const char *name,
92 ir_mode_arithmetic arithmetic,
94 unsigned modulo_shift);
97 * Create a new ieee754 float mode.
99 * float-modes are always signed and have no modulo shift.
100 * @param name the name of the mode to be created
101 * @param arithmetic arithmetic/representation of the mode
102 * @param exponent_size size of exponent in bits
103 * @param mantissa_size size of mantissa in bits (number of bits after the
106 FIRM_API ir_mode *new_float_mode(const char *name,
107 ir_mode_arithmetic arithmetic,
108 unsigned exponent_size,
109 unsigned mantissa_size);
112 * Checks whether a pointer points to a mode.
114 * @param thing an arbitrary pointer
117 * true if the thing is a mode, else false
119 FIRM_API int is_mode(const void *thing);
121 /** Returns the ident* of the mode */
122 FIRM_API ident *get_mode_ident(const ir_mode *mode);
124 /** Returns the null-terminated name of this mode. */
125 FIRM_API const char *get_mode_name(const ir_mode *mode);
127 /** Returns the size of values of the mode in bits. */
128 FIRM_API unsigned get_mode_size_bits(const ir_mode *mode);
130 /** Returns the size of values of the mode in bytes.
131 * If the size is not dividable by 8 returns -1. */
132 FIRM_API unsigned get_mode_size_bytes(const ir_mode *mode);
134 /** Returns the signess of a mode.
136 * Returns the signess of a mode: 1 if mode is signed. */
137 FIRM_API int get_mode_sign(const ir_mode *mode);
139 /** Returns the arithmetic of a mode */
140 FIRM_API ir_mode_arithmetic get_mode_arithmetic(const ir_mode *mode);
142 /** Returns the modulo shift attribute.
144 * Attribute modulo shift specifies for modes of kind irms_int_number
145 * whether shift applies modulo to value of bits to shift. Zero for
146 * modes that are not integer.
148 FIRM_API unsigned int get_mode_modulo_shift(const ir_mode *mode);
150 /** Returns the stored intermediate information. */
151 FIRM_API void *get_mode_link(const ir_mode *mode);
153 /** Stores new intermediate information. */
154 FIRM_API void set_mode_link(ir_mode *mode, void *l);
157 * Returns the smallest representable value of a given mode.
159 * For modes of the sort float_number this is the most negative value
160 * bigger than -infinite.
162 FIRM_API ir_tarval *get_mode_min(ir_mode *mode);
165 * Returns the biggest representable value o f a given mode.
167 * For modes of the sort float_number this is the largest value lower
170 FIRM_API ir_tarval *get_mode_max(ir_mode *mode);
173 * Returns the value Zero represented in this mode.
175 * Zero is the additive neutral element and as such
176 * is defined only for modes allowing addition, i.e.
177 * op_pin_state_floats and ints, and references (NULL-Pointer)
178 * else returns tarval_bad.
180 FIRM_API ir_tarval *get_mode_null(ir_mode *mode);
183 * Returns the value One, represented in this mode.
185 * One, being the multiplicative neutral element,
186 * is defined only for modes allowing multiplication,
187 * i.e. ints and floats.
189 FIRM_API ir_tarval *get_mode_one(ir_mode *mode);
192 * Returns the value Minus One, represented in this mode.
194 * Minus One is defined only for modes allowing
195 * multiplication with signed values, i.e. signed ints and floats.
197 FIRM_API ir_tarval *get_mode_minus_one(ir_mode *mode);
200 * Returns the value where all bits are One, represented in this mode.
202 * All One is defined only for modes integer, reference and boolean modes
204 FIRM_API ir_tarval *get_mode_all_one(ir_mode *mode);
207 * Returns the positive infinite value of a mode.
209 * This is only valid for float_numbers, other modes
210 * will result in tarval_bad.
212 FIRM_API ir_tarval *get_mode_infinite(ir_mode *mode);
215 * Returns the NAN value of a given mode.
217 * This is only valid for float_numbers, other modes
218 * will result in tarval_bad.
220 FIRM_API ir_tarval *get_mode_NAN(ir_mode *mode);
222 FIRM_API ir_mode *mode_M; /**< memory */
224 FIRM_API ir_mode *mode_F; /**< ieee754 binary32 float (single precision) */
225 FIRM_API ir_mode *mode_D; /**< ieee754 binary64 float (double precision) */
226 FIRM_API ir_mode *mode_Q; /**< ieee754 binary128 float (quadruple precision)*/
227 FIRM_API ir_mode *mode_Bs; /**< int8 */
228 FIRM_API ir_mode *mode_Bu; /**< uint8 */
229 FIRM_API ir_mode *mode_Hs; /**< int16 */
230 FIRM_API ir_mode *mode_Hu; /**< uint16 */
231 FIRM_API ir_mode *mode_Is; /**< int32 */
232 FIRM_API ir_mode *mode_Iu; /**< uint32 */
233 FIRM_API ir_mode *mode_Ls; /**< int64 */
234 FIRM_API ir_mode *mode_Lu; /**< uint64 */
235 FIRM_API ir_mode *mode_LLs; /**< int128 */
236 FIRM_API ir_mode *mode_LLu; /**< uint128 */
238 FIRM_API ir_mode *mode_P; /**< pointer */
239 FIRM_API ir_mode *mode_P_code; /**< A pointer mode that is set by the client of libfirm. This mode
240 represents the pointer size of the target machine code addresses. Is initialized
242 FIRM_API ir_mode *mode_P_data; /**< A pointer mode that is set by the client of libfirm. This mode
243 represents the pointer size of the target machine data addresses. Is initialized
246 FIRM_API ir_mode *mode_b; /**< internal boolean */
248 FIRM_API ir_mode *mode_X; /**< execution */
249 FIRM_API ir_mode *mode_BB; /**< block */
251 FIRM_API ir_mode *mode_T; /**< tuple (none) */
252 FIRM_API ir_mode *mode_ANY;/**< undefined mode */
253 FIRM_API ir_mode *mode_BAD;/**< bad mode */
255 /** Returns float mode */
256 FIRM_API ir_mode *get_modeF(void);
257 /** Returns double mode */
258 FIRM_API ir_mode *get_modeD(void);
259 /** Returns quadruple prevision mode */
260 FIRM_API ir_mode *get_modeQ(void);
261 /** Returns byte signed mode */
262 FIRM_API ir_mode *get_modeBs(void);
263 /** Returns byte unsigned mode */
264 FIRM_API ir_mode *get_modeBu(void);
265 /** Returns halfword signed mode */
266 FIRM_API ir_mode *get_modeHs(void);
267 /** Returns halfword unsigned mode */
268 FIRM_API ir_mode *get_modeHu(void);
269 /** Returns integer signed mode */
270 FIRM_API ir_mode *get_modeIs(void);
271 /** Returns integer unsigned mode */
272 FIRM_API ir_mode *get_modeIu(void);
273 /** Returns long signed mode */
274 FIRM_API ir_mode *get_modeLs(void);
275 /** Returns long unsigned mode */
276 FIRM_API ir_mode *get_modeLu(void);
277 /** Returns long long signed mode */
278 FIRM_API ir_mode *get_modeLLs(void);
279 /** Returns long long unsigned mode */
280 FIRM_API ir_mode *get_modeLLu(void);
281 /** Returns pointer mode */
282 FIRM_API ir_mode *get_modeP(void);
283 /** Returns internal boolean mode */
284 FIRM_API ir_mode *get_modeb(void);
285 /** Returns control-flow mode */
286 FIRM_API ir_mode *get_modeX(void);
287 /** Returns Basic-Block mode */
288 FIRM_API ir_mode *get_modeBB(void);
289 /** Returns memory mode */
290 FIRM_API ir_mode *get_modeM(void);
291 /** Returns tuple mode */
292 FIRM_API ir_mode *get_modeT(void);
293 /** Returns ANY mode */
294 FIRM_API ir_mode *get_modeANY(void);
295 /** Returns BAD mode */
296 FIRM_API ir_mode *get_modeBAD(void);
298 /** Returns the machine specific pointer mode for code addresses. */
299 FIRM_API ir_mode *get_modeP_code(void);
301 /** Returns the machine specific pointer mode for data addresses. */
302 FIRM_API ir_mode *get_modeP_data(void);
305 * Sets the machine specific pointer mode for code addresses.
306 * If not set, the predefined mode mode_P will be used.
308 FIRM_API void set_modeP_code(ir_mode *p);
311 * Sets the machine specific pointer mode for data addresses.
312 * If not set, the predefined mode mode_P will be used.
314 FIRM_API void set_modeP_data(ir_mode *p);
316 /** Returns 1 if @p mode is signed, 0 otherwise */
317 FIRM_API int mode_is_signed (const ir_mode *mode);
318 /** Returns 1 if @p mode is for floatingpoint numbers, 0 otherwise */
319 FIRM_API int mode_is_float (const ir_mode *mode);
320 /** Returns 1 if @p mode is for integer numbers, 0 otherwise */
321 FIRM_API int mode_is_int (const ir_mode *mode);
322 /** Returns 1 if @p mode is for references/pointers, 0 otherwise */
323 FIRM_API int mode_is_reference (const ir_mode *mode);
324 /** Returns 1 if @p mode is for numeric values, 0 otherwise */
325 FIRM_API int mode_is_num (const ir_mode *mode);
326 /** Returns 1 if @p mode is for data values, 0 otherwise */
327 FIRM_API int mode_is_data (const ir_mode *mode);
328 /** Returns 1 if @p mode is for data values or internal booleans, 0 otherwise */
329 FIRM_API int mode_is_datab (const ir_mode *mode);
330 /** Returns 1 if @p mode is for data values or memory, 0 otherwise */
331 FIRM_API int mode_is_dataM (const ir_mode *mode);
334 * Returns true if sm can be converted to lm without loss
335 * according to firm definition.
337 * Note that mode_Iu is NOT smaller than mode_Is here.
339 * @see values_in_mode()
341 FIRM_API int smaller_mode(const ir_mode *sm, const ir_mode *lm);
344 * Returns true if a value of mode sm can be converted into mode lm
345 * and backwards without loss.
347 * Note that mode_Iu values CAN be converted in mode_Is and back.
349 * @see smaller_mode()
351 FIRM_API int values_in_mode(const ir_mode *sm, const ir_mode *lm);
354 * Returns a matching unsigned mode for a given integer signed mode.
355 * Returns NULL if no matching mode exists.
357 FIRM_API ir_mode *find_unsigned_mode(const ir_mode *mode);
360 * Returns a matching signed mode for a given integer unsigned mode.
361 * Returns NULL if no matching mode exists.
363 FIRM_API ir_mode *find_signed_mode(const ir_mode *mode);
366 * Returns an integer mode with 2*n bits for a given integer mode with n bits.
367 * Returns NULL if no matching mode exists.
369 FIRM_API ir_mode *find_double_bits_int_mode(const ir_mode *mode);
372 * Returns non-zero if the given mode honors signed zero's, i.e.,
373 * a +0 and a -0 exists and handled differently.
375 FIRM_API int mode_honor_signed_zeros(const ir_mode *mode);
378 * Returns non-zero if the given mode might overflow on unary Minus.
380 FIRM_API int mode_overflow_on_unary_Minus(const ir_mode *mode);
383 * Returns non-zero if the mode has a reversed wrap-around
384 * logic, especially (a + x) - x == a.
385 * This is normally true for integer modes, not for floating
388 FIRM_API int mode_wrap_around(const ir_mode *mode);
391 * Returns the signed integer equivalent mode for an reference mode.
393 FIRM_API ir_mode *get_reference_mode_signed_eq(ir_mode *mode);
396 * Sets the signed integer equivalent mode for an reference mode.
398 FIRM_API void set_reference_mode_signed_eq(ir_mode *ref_mode, ir_mode *int_mode);
401 * Returns the unsigned integer equivalent mode for an reference mode.
403 FIRM_API ir_mode *get_reference_mode_unsigned_eq(ir_mode *mode);
406 * Sets the unsigned integer equivalent mode for an reference mode.
408 FIRM_API void set_reference_mode_unsigned_eq(ir_mode *ref_mode, ir_mode *int_mode);
411 * Returns size of mantissa in bits (for float modes).
412 * Note: This is the number of bits used after the leading one. So the actual
413 * accuracy of the significand is get_mode_mantissa_size()+1. The number of bits
414 * used in the encoding depends on wether the floatingpoint mode has an implicit
415 * (ieee754) or explicit (x86_extended) encoding of the leading one.
417 FIRM_API unsigned get_mode_mantissa_size(const ir_mode *mode);
420 * Returns size of exponent in bits (for float modes)
422 FIRM_API unsigned get_mode_exponent_size(const ir_mode *mode);
425 * Returns non-zero if the cast from mode src to mode dst is a
426 * reinterpret cast (ie. only the bit pattern is reinterpreted,
427 * no conversion is done)
429 FIRM_API int is_reinterpret_cast(const ir_mode *src, const ir_mode *dst);
432 * Returns the primitive type matching the given mode
434 FIRM_API ir_type *get_type_for_mode(const ir_mode *mode);
436 /** Returns number of known modes. */
437 FIRM_API size_t ir_get_n_modes(void);
439 /** Returns known mode number @p num. */
440 FIRM_API ir_mode *ir_get_mode(size_t num);