2 * This file is part of libFirm.
3 * Copyright (C) 2012 University of Karlsruhe.
8 * @brief Data modes of operations.
9 * @author Martin Trapp, Christian Schaefer, Goetz Lindenmaier, Mathias Heil,
12 #ifndef FIRM_IR_IRMODE_H
13 #define FIRM_IR_IRMODE_H
15 #include "firm_types.h"
21 * @defgroup ir_mode Value Modes
22 * This module specifies the modes that type the firm nodes. It defines
23 * a datasturcture that describes a mode and implements constructors and
24 * access routines to this datastructure. Further it defines a set of
28 * UKA tech report 1999-44 for more information about modes.
33 * These values represent the different arithmetic operations possible with a
36 typedef enum ir_mode_arithmetic {
37 irma_none = 1, /**< For modes for which no representation is
38 specified. These are modes of sort auxiliary,
39 internal_boolean and character. */
40 irma_twos_complement = 2, /**< Values of the mode are represented as two's
41 complement. Only legal for modes of sort
42 int_number and reference. */
43 irma_ieee754 = 256, /**< Values of the mode are represented according
44 to ieee754 floating point standard. Only
45 legal for modes of sort float_number. */
46 irma_x86_extended_float, /**< x86 extended floatingpoint values */
47 irma_last = irma_x86_extended_float,
53 * @param name the name of the mode to be created
54 * @param arithmetic arithmetic operations possible with a mode
55 * @param bit_size number of bits this mode allocate
56 * @param sign non-zero if this is a signed mode
57 * @param modulo_shift Is ignored for modes other than integer.
59 * This function constructs a new mode given by the parameters.
60 * If the parameters match an already defined mode, this mode is returned
61 * (including the default modes).
64 * The new mode or NULL on error.
66 FIRM_API ir_mode *new_int_mode(const char *name,
67 ir_mode_arithmetic arithmetic,
68 unsigned bit_size, int sign,
69 unsigned modulo_shift);
72 * Create a new reference mode.
74 * Reference modes are always unsigned.
76 FIRM_API ir_mode *new_reference_mode(const char *name,
77 ir_mode_arithmetic arithmetic,
79 unsigned modulo_shift);
82 * Create a new ieee754 float mode.
84 * float-modes are always signed and have no modulo shift.
85 * @param name the name of the mode to be created
86 * @param arithmetic arithmetic/representation of the mode
87 * @param exponent_size size of exponent in bits
88 * @param mantissa_size size of mantissa in bits (number of bits after the
91 FIRM_API ir_mode *new_float_mode(const char *name,
92 ir_mode_arithmetic arithmetic,
93 unsigned exponent_size,
94 unsigned mantissa_size);
97 * Checks whether a pointer points to a mode.
99 * @param thing an arbitrary pointer
102 * true if the thing is a mode, else false
104 FIRM_API int is_mode(const void *thing);
106 /** Returns the ident* of the mode */
107 FIRM_API ident *get_mode_ident(const ir_mode *mode);
109 /** Returns the null-terminated name of this mode. */
110 FIRM_API const char *get_mode_name(const ir_mode *mode);
112 /** Returns the size of values of the mode in bits. */
113 FIRM_API unsigned get_mode_size_bits(const ir_mode *mode);
115 /** Returns the size of values of the mode in bytes.
116 * If the size is not dividable by 8 returns -1. */
117 FIRM_API unsigned get_mode_size_bytes(const ir_mode *mode);
119 /** Returns the signess of a mode.
121 * Returns the signess of a mode: 1 if mode is signed. */
122 FIRM_API int get_mode_sign(const ir_mode *mode);
124 /** Returns the arithmetic of a mode */
125 FIRM_API ir_mode_arithmetic get_mode_arithmetic(const ir_mode *mode);
127 /** Returns the modulo shift attribute.
129 * Attribute modulo shift specifies for modes of kind irms_int_number
130 * whether shift applies modulo to value of bits to shift. Zero for
131 * modes that are not integer.
133 FIRM_API unsigned int get_mode_modulo_shift(const ir_mode *mode);
135 /** Returns the stored intermediate information. */
136 FIRM_API void *get_mode_link(const ir_mode *mode);
138 /** Stores new intermediate information. */
139 FIRM_API void set_mode_link(ir_mode *mode, void *l);
142 * Returns the smallest representable value of a given mode.
144 * For modes of the sort float_number this is the most negative value
145 * bigger than -infinite.
147 FIRM_API ir_tarval *get_mode_min(ir_mode *mode);
150 * Returns the biggest representable value o f a given mode.
152 * For modes of the sort float_number this is the largest value lower
155 FIRM_API ir_tarval *get_mode_max(ir_mode *mode);
158 * Returns the value Zero represented in this mode.
160 * Zero is the additive neutral element and as such
161 * is defined only for modes allowing addition, i.e.
162 * op_pin_state_floats and ints, and references (NULL-Pointer)
163 * else returns tarval_bad.
165 FIRM_API ir_tarval *get_mode_null(ir_mode *mode);
168 * Returns the value One, represented in this mode.
170 * One, being the multiplicative neutral element,
171 * is defined only for modes allowing multiplication,
172 * i.e. ints and floats.
174 FIRM_API ir_tarval *get_mode_one(ir_mode *mode);
177 * Returns the value Minus One, represented in this mode.
179 * Minus One is defined only for modes allowing
180 * multiplication with signed values, i.e. signed ints and floats.
182 FIRM_API ir_tarval *get_mode_minus_one(ir_mode *mode);
185 * Returns the value where all bits are One, represented in this mode.
187 * All One is defined only for modes integer, reference and boolean modes
189 FIRM_API ir_tarval *get_mode_all_one(ir_mode *mode);
192 * Returns the positive infinite value of a mode.
194 * This is only valid for float_numbers, other modes
195 * will result in tarval_bad.
197 FIRM_API ir_tarval *get_mode_infinite(ir_mode *mode);
200 * Returns the NAN value of a given mode.
202 * This is only valid for float_numbers, other modes
203 * will result in tarval_bad.
205 FIRM_API ir_tarval *get_mode_NAN(ir_mode *mode);
207 FIRM_API ir_mode *mode_M; /**< memory */
209 FIRM_API ir_mode *mode_F; /**< ieee754 binary32 float (single precision) */
210 FIRM_API ir_mode *mode_D; /**< ieee754 binary64 float (double precision) */
211 FIRM_API ir_mode *mode_Q; /**< ieee754 binary128 float (quadruple precision)*/
212 FIRM_API ir_mode *mode_Bs; /**< int8 */
213 FIRM_API ir_mode *mode_Bu; /**< uint8 */
214 FIRM_API ir_mode *mode_Hs; /**< int16 */
215 FIRM_API ir_mode *mode_Hu; /**< uint16 */
216 FIRM_API ir_mode *mode_Is; /**< int32 */
217 FIRM_API ir_mode *mode_Iu; /**< uint32 */
218 FIRM_API ir_mode *mode_Ls; /**< int64 */
219 FIRM_API ir_mode *mode_Lu; /**< uint64 */
220 FIRM_API ir_mode *mode_LLs; /**< int128 */
221 FIRM_API ir_mode *mode_LLu; /**< uint128 */
223 FIRM_API ir_mode *mode_P; /**< pointer */
224 FIRM_API ir_mode *mode_P_code; /**< A pointer mode that is set by the client of libfirm. This mode
225 represents the pointer size of the target machine code addresses. Is initialized
227 FIRM_API ir_mode *mode_P_data; /**< A pointer mode that is set by the client of libfirm. This mode
228 represents the pointer size of the target machine data addresses. Is initialized
231 FIRM_API ir_mode *mode_b; /**< internal boolean */
233 FIRM_API ir_mode *mode_X; /**< execution */
234 FIRM_API ir_mode *mode_BB; /**< block */
236 FIRM_API ir_mode *mode_T; /**< tuple (none) */
237 FIRM_API ir_mode *mode_ANY;/**< undefined mode */
238 FIRM_API ir_mode *mode_BAD;/**< bad mode */
240 /** Returns float mode */
241 FIRM_API ir_mode *get_modeF(void);
242 /** Returns double mode */
243 FIRM_API ir_mode *get_modeD(void);
244 /** Returns quadruple prevision mode */
245 FIRM_API ir_mode *get_modeQ(void);
246 /** Returns byte signed mode */
247 FIRM_API ir_mode *get_modeBs(void);
248 /** Returns byte unsigned mode */
249 FIRM_API ir_mode *get_modeBu(void);
250 /** Returns halfword signed mode */
251 FIRM_API ir_mode *get_modeHs(void);
252 /** Returns halfword unsigned mode */
253 FIRM_API ir_mode *get_modeHu(void);
254 /** Returns integer signed mode */
255 FIRM_API ir_mode *get_modeIs(void);
256 /** Returns integer unsigned mode */
257 FIRM_API ir_mode *get_modeIu(void);
258 /** Returns long signed mode */
259 FIRM_API ir_mode *get_modeLs(void);
260 /** Returns long unsigned mode */
261 FIRM_API ir_mode *get_modeLu(void);
262 /** Returns long long signed mode */
263 FIRM_API ir_mode *get_modeLLs(void);
264 /** Returns long long unsigned mode */
265 FIRM_API ir_mode *get_modeLLu(void);
266 /** Returns pointer mode */
267 FIRM_API ir_mode *get_modeP(void);
268 /** Returns internal boolean mode */
269 FIRM_API ir_mode *get_modeb(void);
270 /** Returns control-flow mode */
271 FIRM_API ir_mode *get_modeX(void);
272 /** Returns Basic-Block mode */
273 FIRM_API ir_mode *get_modeBB(void);
274 /** Returns memory mode */
275 FIRM_API ir_mode *get_modeM(void);
276 /** Returns tuple mode */
277 FIRM_API ir_mode *get_modeT(void);
278 /** Returns ANY mode */
279 FIRM_API ir_mode *get_modeANY(void);
280 /** Returns BAD mode */
281 FIRM_API ir_mode *get_modeBAD(void);
283 /** Returns the machine specific pointer mode for code addresses. */
284 FIRM_API ir_mode *get_modeP_code(void);
286 /** Returns the machine specific pointer mode for data addresses. */
287 FIRM_API ir_mode *get_modeP_data(void);
290 * Sets the machine specific pointer mode for code addresses.
291 * If not set, the predefined mode mode_P will be used.
293 FIRM_API void set_modeP_code(ir_mode *p);
296 * Sets the machine specific pointer mode for data addresses.
297 * If not set, the predefined mode mode_P will be used.
299 FIRM_API void set_modeP_data(ir_mode *p);
301 /** Returns 1 if @p mode is signed, 0 otherwise */
302 FIRM_API int mode_is_signed (const ir_mode *mode);
303 /** Returns 1 if @p mode is for floatingpoint numbers, 0 otherwise */
304 FIRM_API int mode_is_float (const ir_mode *mode);
305 /** Returns 1 if @p mode is for integer numbers, 0 otherwise */
306 FIRM_API int mode_is_int (const ir_mode *mode);
307 /** Returns 1 if @p mode is for references/pointers, 0 otherwise */
308 FIRM_API int mode_is_reference (const ir_mode *mode);
309 /** Returns 1 if @p mode is for numeric values, 0 otherwise */
310 FIRM_API int mode_is_num (const ir_mode *mode);
311 /** Returns 1 if @p mode is for data values, 0 otherwise */
312 FIRM_API int mode_is_data (const ir_mode *mode);
313 /** Returns 1 if @p mode is for data values or internal booleans, 0 otherwise */
314 FIRM_API int mode_is_datab (const ir_mode *mode);
315 /** Returns 1 if @p mode is for data values or memory, 0 otherwise */
316 FIRM_API int mode_is_dataM (const ir_mode *mode);
319 * Returns true if a value of mode @p sm can be converted to mode @p lm without
322 * That is the interpretation of the numbers does not changes, so you a signed
323 * integer mode is never smaller than an unsigned integer mode since the
324 * unsigned mode can't represent negative numbers in a way that they are
325 * interpreted as negative numbers.
327 * @see values_in_mode()
329 FIRM_API int smaller_mode(const ir_mode *sm, const ir_mode *lm);
332 * Returns true if no information is lost when converting a value of mode @p sm
333 * into mode @p lm (and back to mode @p sm).
335 * So the interpretation of the values may change in the intermediate mode @p sm
336 * (for example when converting negative signed integer numbers into unsigned
337 * integers) but after a conversion back they are exactly the same value.
339 * @see smaller_mode()
341 FIRM_API int values_in_mode(const ir_mode *sm, const ir_mode *lm);
344 * Returns a matching unsigned mode for a given integer signed mode.
345 * Returns NULL if no matching mode exists.
347 FIRM_API ir_mode *find_unsigned_mode(const ir_mode *mode);
350 * Returns a matching signed mode for a given integer unsigned mode.
351 * Returns NULL if no matching mode exists.
353 FIRM_API ir_mode *find_signed_mode(const ir_mode *mode);
356 * Returns an integer mode with 2*n bits for a given integer mode with n bits.
357 * Returns NULL if no matching mode exists.
359 FIRM_API ir_mode *find_double_bits_int_mode(const ir_mode *mode);
362 * Returns non-zero if the given mode honors signed zero's, i.e.,
363 * a +0 and a -0 exists and handled differently.
365 FIRM_API int mode_honor_signed_zeros(const ir_mode *mode);
368 * Returns non-zero if the given mode might overflow on unary Minus.
370 FIRM_API int mode_overflow_on_unary_Minus(const ir_mode *mode);
373 * Returns non-zero if the mode has a reversed wrap-around
374 * logic, especially (a + x) - x == a.
375 * This is normally true for integer modes, not for floating
378 FIRM_API int mode_wrap_around(const ir_mode *mode);
381 * Returns the signed integer equivalent mode for an reference mode.
383 FIRM_API ir_mode *get_reference_mode_signed_eq(ir_mode *mode);
386 * Sets the signed integer equivalent mode for an reference mode.
388 FIRM_API void set_reference_mode_signed_eq(ir_mode *ref_mode, ir_mode *int_mode);
391 * Returns the unsigned integer equivalent mode for an reference mode.
393 FIRM_API ir_mode *get_reference_mode_unsigned_eq(ir_mode *mode);
396 * Sets the unsigned integer equivalent mode for an reference mode.
398 FIRM_API void set_reference_mode_unsigned_eq(ir_mode *ref_mode, ir_mode *int_mode);
401 * Returns size of mantissa in bits (for float modes).
402 * Note: This is the number of bits used after the leading one. So the actual
403 * accuracy of the significand is get_mode_mantissa_size()+1. The number of bits
404 * used in the encoding depends on whether the floatingpoint mode has an implicit
405 * (ieee754) or explicit (x86_extended) encoding of the leading one.
407 FIRM_API unsigned get_mode_mantissa_size(const ir_mode *mode);
410 * Returns size of exponent in bits (for float modes)
412 FIRM_API unsigned get_mode_exponent_size(const ir_mode *mode);
415 * Returns non-zero if the cast from mode src to mode dst is a
416 * reinterpret cast (i.e. only the bit pattern is reinterpreted,
417 * no conversion is done)
419 FIRM_API int is_reinterpret_cast(const ir_mode *src, const ir_mode *dst);
422 * Returns the primitive type matching the given mode
424 FIRM_API ir_type *get_type_for_mode(const ir_mode *mode);
426 /** Returns number of known modes. */
427 FIRM_API size_t ir_get_n_modes(void);
429 /** Returns known mode number @p num. */
430 FIRM_API ir_mode *ir_get_mode(size_t num);