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"
33 * @defgroup ir_mode Value Modes
34 * This module specifies the modes that type the firm nodes. It defines
35 * a datasturcture that describes a mode and implements constructors and
36 * access routines to this datastructure. Further it defines a set of
40 * UKA tech report 1999-44 for more information about modes.
45 * These values represent the different arithmetic operations possible with a
48 typedef enum ir_mode_arithmetic {
49 irma_uninitialized = 0,
50 irma_none = 1, /**< For modes for which no representation is
51 specified. These are modes of sort auxiliary,
52 internal_boolean and character. */
53 irma_twos_complement = 2, /**< Values of the mode are represented as two's
54 complement. Only legal for modes of sort
55 int_number and reference. */
56 irma_ieee754 = 256, /**< Values of the mode are represented according
57 to ieee754 floating point standard. Only
58 legal for modes of sort float_number. */
59 irma_x86_extended_float, /**< x86 extended floatingpoint values */
60 irma_last = irma_x86_extended_float,
66 * @param name the name of the mode to be created
67 * @param sort the ir_mode_sort of the mode to be created
68 * @param bit_size number of bits this mode allocate
69 * @param sign non-zero if this is a signed mode
70 * @param arithmetic arithmetic operations possible with a mode
71 * @param modulo_shift Is ignored for modes other than integer.
73 * This function constructs a new mode given by the parameters.
74 * If the parameters match an already defined mode, this mode is returned
75 * (including the default modes).
78 * The new mode or NULL on error.
80 FIRM_API ir_mode *new_int_mode(const char *name,
81 ir_mode_arithmetic arithmetic,
82 unsigned bit_size, int sign,
83 unsigned modulo_shift);
86 * Create a new reference mode.
88 * Reference modes are always unsigned.
90 FIRM_API ir_mode *new_reference_mode(const char *name,
91 ir_mode_arithmetic arithmetic,
93 unsigned modulo_shift);
96 * Create a new ieee754 float mode.
98 * float-modes are always signed and have no modulo shift.
99 * @param name the name of the mode to be created
100 * @param arithmetic arithmetic/representation of the mode
101 * @param exponent_size size of exponent in bits
102 * @param mantissa_size size of mantissa in bits
104 FIRM_API ir_mode *new_float_mode(const char *name,
105 ir_mode_arithmetic arithmetic,
106 unsigned exponent_size,
107 unsigned mantissa_size);
110 * Checks whether a pointer points to a mode.
112 * @param thing an arbitrary pointer
115 * true if the thing is a mode, else false
117 FIRM_API int is_mode(const void *thing);
119 /** Returns the ident* of the mode */
120 FIRM_API ident *get_mode_ident(const ir_mode *mode);
122 /** Returns the null-terminated name of this mode. */
123 FIRM_API const char *get_mode_name(const ir_mode *mode);
125 /** Returns the size of values of the mode in bits. */
126 FIRM_API unsigned get_mode_size_bits(const ir_mode *mode);
128 /** Returns the size of values of the mode in bytes.
129 * If the size is not dividable by 8 returns -1. */
130 FIRM_API unsigned get_mode_size_bytes(const ir_mode *mode);
132 /** Returns the signess of a mode.
134 * Returns the signess of a mode: 1 if mode is signed. */
135 FIRM_API int get_mode_sign(const ir_mode *mode);
137 /** Returns the arithmetic of a mode */
138 FIRM_API ir_mode_arithmetic get_mode_arithmetic(const ir_mode *mode);
140 /** Get the modulo shift attribute.
142 * Attribute modulo shift specifies for modes of kind irms_int_number
143 * whether shift applies modulo to value of bits to shift. Zero for
144 * modes that are not integer.
146 FIRM_API unsigned int get_mode_modulo_shift(const ir_mode *mode);
148 /** Returns the stored intermediate information. */
149 FIRM_API void *get_mode_link(const ir_mode *mode);
151 /** Stores new intermediate information. */
152 FIRM_API void set_mode_link(ir_mode *mode, void *l);
155 * Returns the smallest representable value of a given mode.
157 * For modes of the sort float_number this is the most negative value
158 * bigger than -infinite.
160 FIRM_API ir_tarval *get_mode_min(ir_mode *mode);
163 * Returns the biggest representable value o f a given mode.
165 * For modes of the sort float_number this is the largest value lower
168 FIRM_API ir_tarval *get_mode_max(ir_mode *mode);
171 * Returns the value Zero represented in this mode.
173 * Zero is the additive neutral element and as such
174 * is defined only for modes allowing addition, i.e.
175 * op_pin_state_floats and ints, and references (NULL-Pointer)
176 * else returns tarval_bad.
178 FIRM_API ir_tarval *get_mode_null(ir_mode *mode);
181 * Returns the value One, represented in this mode.
183 * One, being the multiplicative neutral element,
184 * is defined only for modes allowing multiplication,
185 * i.e. ints and floats.
187 FIRM_API ir_tarval *get_mode_one(ir_mode *mode);
190 * Returns the value Minus One, represented in this mode.
192 * Minus One is defined only for modes allowing
193 * multiplication with signed values, i.e. signed ints and floats.
195 FIRM_API ir_tarval *get_mode_minus_one(ir_mode *mode);
198 * Returns the value where all bits are One, represented in this mode.
200 * All One is defined only for modes integer, reference and boolean modes
202 FIRM_API ir_tarval *get_mode_all_one(ir_mode *mode);
205 * Returns the positive infinite value of a mode.
207 * This is only valid for float_numbers, other modes
208 * will result in tarval_bad.
210 FIRM_API ir_tarval *get_mode_infinite(ir_mode *mode);
213 * Returns the NAN value of a given mode.
215 * This is only valid for float_numbers, other modes
216 * will result in tarval_bad.
218 FIRM_API ir_tarval *get_mode_NAN(ir_mode *mode);
220 FIRM_API ir_mode *mode_M; /**< memory */
222 FIRM_API ir_mode *mode_F; /**< ieee754 binary32 float (single precision) */
223 FIRM_API ir_mode *mode_D; /**< ieee754 binary64 float (double precision) */
224 FIRM_API ir_mode *mode_Q; /**< ieee754 binary128 float (quadruple precision)*/
225 FIRM_API ir_mode *mode_Bs; /**< int8 */
226 FIRM_API ir_mode *mode_Bu; /**< uint8 */
227 FIRM_API ir_mode *mode_Hs; /**< int16 */
228 FIRM_API ir_mode *mode_Hu; /**< uint16 */
229 FIRM_API ir_mode *mode_Is; /**< int32 */
230 FIRM_API ir_mode *mode_Iu; /**< uint32 */
231 FIRM_API ir_mode *mode_Ls; /**< int64 */
232 FIRM_API ir_mode *mode_Lu; /**< uint64 */
233 FIRM_API ir_mode *mode_LLs; /**< int128 */
234 FIRM_API ir_mode *mode_LLu; /**< uint128 */
236 FIRM_API ir_mode *mode_P; /**< pointer */
237 FIRM_API ir_mode *mode_P_code; /**< A pointer mode that is set by the client of libfirm. This mode
238 represents the pointer size of the target machine code addresses. Is initialized
240 FIRM_API ir_mode *mode_P_data; /**< A pointer mode that is set by the client of libfirm. This mode
241 represents the pointer size of the target machine data addresses. Is initialized
244 FIRM_API ir_mode *mode_b; /**< internal boolean */
246 FIRM_API ir_mode *mode_X; /**< execution */
247 FIRM_API ir_mode *mode_BB; /**< block */
249 FIRM_API ir_mode *mode_T; /**< tuple (none) */
250 FIRM_API ir_mode *mode_ANY;/**< undefined mode */
251 FIRM_API ir_mode *mode_BAD;/**< bad mode */
253 FIRM_API ir_mode *get_modeF(void);
254 FIRM_API ir_mode *get_modeD(void);
255 FIRM_API ir_mode *get_modeQ(void);
256 FIRM_API ir_mode *get_modeBs(void);
257 FIRM_API ir_mode *get_modeBu(void);
258 FIRM_API ir_mode *get_modeHs(void);
259 FIRM_API ir_mode *get_modeHu(void);
260 FIRM_API ir_mode *get_modeIs(void);
261 FIRM_API ir_mode *get_modeIu(void);
262 FIRM_API ir_mode *get_modeLs(void);
263 FIRM_API ir_mode *get_modeLu(void);
264 FIRM_API ir_mode *get_modeLLs(void);
265 FIRM_API ir_mode *get_modeLLu(void);
266 FIRM_API ir_mode *get_modeP(void);
267 FIRM_API ir_mode *get_modeb(void);
268 FIRM_API ir_mode *get_modeX(void);
269 FIRM_API ir_mode *get_modeBB(void);
270 FIRM_API ir_mode *get_modeM(void);
271 FIRM_API ir_mode *get_modeT(void);
272 FIRM_API ir_mode *get_modeANY(void);
273 FIRM_API ir_mode *get_modeBAD(void);
275 /** Returns the machine specific pointer mode for code addresses. */
276 FIRM_API ir_mode *get_modeP_code(void);
278 /** Returns the machine specific pointer mode for data addresses. */
279 FIRM_API ir_mode *get_modeP_data(void);
282 * Sets the machine specific pointer mode for code addresses.
283 * If not set, the predefined mode mode_P will be used.
285 FIRM_API void set_modeP_code(ir_mode *p);
288 * Sets the machine specific pointer mode for data addresses.
289 * If not set, the predefined mode mode_P will be used.
291 FIRM_API void set_modeP_data(ir_mode *p);
294 Functions to check, whether a mode is signed, float, int, character,
295 reference, num, data, datab or dataM.
297 For more exact definitions read the corresponding pages
298 in the firm documentation or the following enumeration
300 The set of "float" is defined as:
301 float = {irm_F, irm_D, irm_E}
303 The set of "int" is defined as:
304 int = {irm_Bs, irm_Bu, irm_Hs, irm_Hu, irm_Is, irm_Iu, irm_Ls, irm_Lu}
306 The set of "reference" is defined as:
309 The set of "num" is defined as:
312 The set of "data" is defined as:
313 data = {num || reference}
315 The set of "datab" is defined as:
316 datab = {data || irm_b }
318 The set of "dataM" is defined as:
319 dataM = {data || irm_M}
322 FIRM_API int mode_is_signed (const ir_mode *mode);
323 FIRM_API int mode_is_float (const ir_mode *mode);
324 FIRM_API int mode_is_int (const ir_mode *mode);
325 FIRM_API int mode_is_reference (const ir_mode *mode);
326 FIRM_API int mode_is_num (const ir_mode *mode);
327 FIRM_API int mode_is_data (const ir_mode *mode);
328 FIRM_API int mode_is_datab (const ir_mode *mode);
329 FIRM_API int mode_is_dataM (const ir_mode *mode);
333 * Returns true if sm can be converted to lm without loss
334 * according to firm definition.
336 * Note that mode_Iu is NOT smaller than mode_Is here.
338 * @see values_in_mode()
340 FIRM_API int smaller_mode(const ir_mode *sm, const ir_mode *lm);
343 * Returns true if a value of mode sm can be converted into mode lm
344 * and backwards without loss.
346 * Note that mode_Iu values CAN be converted in mode_Is and back.
348 * @see smaller_mode()
350 FIRM_API int values_in_mode(const ir_mode *sm, const ir_mode *lm);
353 * Returns a matching unsigned mode for a given integer signed mode.
354 * Returns NULL if no matching mode exists.
356 FIRM_API ir_mode *find_unsigned_mode(const ir_mode *mode);
359 * Returns a matching signed mode for a given integer unsigned mode.
360 * Returns NULL if no matching mode exists.
362 FIRM_API ir_mode *find_signed_mode(const ir_mode *mode);
365 * Returns an integer mode with 2*n bits for a given integer mode with n bits.
366 * Returns NULL if no matching mode exists.
368 FIRM_API ir_mode *find_double_bits_int_mode(const ir_mode *mode);
371 * Returns non-zero if the given mode honors signed zero's, i.e.,
372 * a +0 and a -0 exists and handled differently.
374 FIRM_API int mode_honor_signed_zeros(const ir_mode *mode);
377 * Returns non-zero if the given mode might overflow on unary Minus.
379 FIRM_API int mode_overflow_on_unary_Minus(const ir_mode *mode);
382 * Returns non-zero if the mode has a reversed wrap-around
383 * logic, especially (a + x) - x == a.
384 * This is normally true for integer modes, not for floating
387 FIRM_API int mode_wrap_around(const ir_mode *mode);
390 * Return the signed integer equivalent mode for an reference mode.
392 FIRM_API ir_mode *get_reference_mode_signed_eq(ir_mode *mode);
395 * Sets the signed integer equivalent mode for an reference mode.
397 FIRM_API void set_reference_mode_signed_eq(ir_mode *ref_mode, ir_mode *int_mode);
400 * Return the unsigned integer equivalent mode for an reference mode.
402 FIRM_API ir_mode *get_reference_mode_unsigned_eq(ir_mode *mode);
405 * Sets the unsigned integer equivalent mode for an reference mode.
407 FIRM_API void set_reference_mode_unsigned_eq(ir_mode *ref_mode, ir_mode *int_mode);
410 * Return size of mantissa in bits (for float modes)
412 FIRM_API unsigned get_mode_mantissa_size(const ir_mode *mode);
415 * Return size of exponent in bits (for float modes)
417 FIRM_API unsigned get_mode_exponent_size(const ir_mode *mode);
420 * Returns non-zero if the cast from mode src to mode dst is a
421 * reinterpret cast (ie. only the bit pattern is reinterpreted,
422 * no conversion is done)
424 FIRM_API int is_reinterpret_cast(const ir_mode *src, const ir_mode *dst);
427 * Returns the primitive type matching the given mode
429 FIRM_API ir_type *get_type_for_mode(const ir_mode *mode);