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4 * This file is part of libFirm.
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15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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22 * @brief Lowering of high level constructs.
23 * @author Michael Beck
25 #ifndef FIRM_LOWERING_H
26 #define FIRM_LOWERING_H
30 #include "firm_types.h"
35 * @defgroup ir_lowering Lowering
37 * Lowering is the process of transforming a highlevel representation
38 * (a representation closer to the sourcecode) into a lower-level representation
39 * (something closer to the target machine).
45 * Lower small CopyB nodes to Load/Store nodes, preserve medium-sized CopyB
46 * nodes and replace large CopyBs by a call to memcpy, depending on the given
49 * Small CopyB nodes (size <= max_small_size) are turned into a series of
51 * Medium-sized CopyB nodes (max_small_size < size < min_large_size) are
53 * Large CopyB nodes (size >= min_large_size) are turned into a memcpy call.
55 * @param irg The graph to be lowered.
56 * @param max_small_size The maximum number of bytes for a CopyB node so
57 * that it is still considered 'small'.
58 * @param min_large_size The minimum number of bytes for a CopyB node so
59 * that it is regarded as 'large'.
60 * @param allow_misalignments Backend can handle misaligned loads and stores.
62 FIRM_API void lower_CopyB(ir_graph *irg, unsigned max_small_size,
63 unsigned min_large_size, int allow_misalignments);
66 * Lowers all Switches (Cond nodes with non-boolean mode) depending on spare_size.
67 * They will either remain the same or be converted into if-cascades.
69 * @param irg The ir graph to be lowered.
70 * @param small_switch If switch has <= cases then change it to an if-cascade.
71 * @param spare_size Allowed spare size for table switches in machine words.
72 * (Default in edgfe: 128)
73 * @param selector_mode mode which must be used for Switch selector
75 FIRM_API void lower_switch(ir_graph *irg, unsigned small_switch,
76 unsigned spare_size, ir_mode *selector_mode);
79 * Replaces SymConsts by a real constant if possible.
80 * Replaces Sel nodes by address computation. Also resolves array access.
81 * Handle bit fields by added And/Or calculations.
83 * @param irg the graph to lower
85 * @note: There is NO lowering ob objects oriented types. This is highly compiler
86 * and ABI specific and should be placed directly in the compiler.
88 FIRM_API void lower_highlevel_graph(ir_graph *irg);
91 * Creates an ir_graph pass for lower_highlevel_graph().
93 * @param name the name of this pass or NULL
95 * @return the newly created ir_graph pass
97 FIRM_API ir_graph_pass_t *lower_highlevel_graph_pass(const char *name);
100 * Replaces SymConsts by a real constant if possible.
101 * Replaces Sel nodes by address computation. Also resolves array access.
102 * Handle bit fields by added And/Or calculations.
105 * @note There is NO lowering of objects oriented types. This is highly compiler
106 * and ABI specific and should be placed directly in the compiler.
108 FIRM_API void lower_highlevel(void);
111 * does the same as lower_highlevel for all nodes on the const code irg
113 FIRM_API void lower_const_code(void);
116 * Creates an ir_prog pass for lower_const_code().
118 * @param name the name of this pass or NULL
120 * @return the newly created ir_prog pass
122 FIRM_API ir_prog_pass_t *lower_const_code_pass(const char *name);
125 * Used as callback, whenever a lowerable mux is found. The return value
126 * indicates, whether the mux should be lowered. This may be used, to lower
127 * floating point muxes, while keeping mux nodes for integers, for example.
129 * @param mux The mux node that may be lowered.
130 * @return A non-zero value indicates that the mux should be lowered.
132 typedef int lower_mux_callback(ir_node* mux);
135 * Lowers all mux nodes in the given graph. A callback function may be
136 * given, to select the mux nodes to lower.
138 * @param irg The graph to lower mux nodes in.
139 * @param cb_func The callback function for mux selection. Can be NULL,
140 * to lower all mux nodes.
142 FIRM_API void lower_mux(ir_graph *irg, lower_mux_callback *cb_func);
145 * Creates an ir_graph pass for lower_mux().
147 * @param name the name of this pass or NULL
148 * @param cb_func The callback function for mux selection. Can be NULL,
149 * to lower all mux nodes.
151 * @return the newly created ir_graph pass
153 FIRM_API ir_graph_pass_t *lower_mux_pass(const char *name,
154 lower_mux_callback *cb_func);
157 * An intrinsic mapper function.
159 * @param node the IR-node that will be mapped
160 * @param ctx a context
162 * @return non-zero if the call was mapped
164 typedef int (*i_mapper_func)(ir_node *node, void *ctx);
166 /** kind of an instruction record
169 INTRINSIC_CALL = 0, /**< the record represents an intrinsic call */
170 INTRINSIC_INSTR /**< the record represents an intrinsic instruction */
174 * An intrinsic call record.
176 typedef struct i_call_record {
177 enum ikind kind; /**< must be INTRINSIC_CALL */
178 ir_entity *i_ent; /**< the entity representing an intrinsic call */
179 i_mapper_func i_mapper; /**< the mapper function to call */
180 void *ctx; /**< mapper context */
181 void *link; /**< used in the construction algorithm, must be NULL */
185 * An intrinsic instruction record.
187 typedef struct i_instr_record {
188 enum ikind kind; /**< must be INTRINSIC_INSTR */
189 ir_op *op; /**< the opcode that must be mapped. */
190 i_mapper_func i_mapper; /**< the mapper function to call */
191 void *ctx; /**< mapper context */
192 void *link; /**< used in the construction algorithm, must be NULL */
196 * An intrinsic record.
198 typedef union i_record {
199 enum ikind kind; /**< kind of record */
200 i_call_record i_call; /**< used for call records */
201 i_instr_record i_instr; /**< used for isnstruction records */
205 * Go through all graphs and map calls to intrinsic functions and instructions.
207 * Every call or instruction is reported to its mapper function,
208 * which is responsible for rebuilding the graph.
210 * @param list an array of intrinsic map records
211 * @param length the length of the array
212 * @param part_block_used set to true if part_block() must be using during lowering
214 * @return number of found intrinsics.
216 FIRM_API size_t lower_intrinsics(i_record *list, size_t length,
217 int part_block_used);
220 * Creates an irprog pass for lower_intrinsics.
222 * @param name the name of this pass or NULL
223 * @param list an array of intrinsic map records
224 * @param length the length of the array
225 * @param part_block_used set to true if part_block() must be using during lowering
227 FIRM_API ir_prog_pass_t *lower_intrinsics_pass(const char *name, i_record *list,
228 size_t length, int part_block_used);
231 * A mapper for the integer/float absolute value: type abs(type v).
232 * Replaces the call by a Abs node.
236 FIRM_API int i_mapper_abs(ir_node *call, void *ctx);
239 * A mapper for the integer byte swap value: type bswap(type v).
240 * Replaces the call by a builtin[ir_bk_bswap] node.
244 FIRM_API int i_mapper_bswap(ir_node *call, void *ctx);
247 * A mapper for the floating point sqrt(v): floattype sqrt(floattype v);
249 * @return 1 if the sqrt call was removed, 0 else.
251 FIRM_API int i_mapper_sqrt(ir_node *call, void *ctx);
254 * A mapper for the floating point cbrt(v): floattype sqrt(floattype v);
256 * @return 1 if the cbrt call was removed, 0 else.
258 FIRM_API int i_mapper_cbrt(ir_node *call, void *ctx);
261 * A mapper for the floating point pow(a, b): floattype pow(floattype a, floattype b);
263 * @return 1 if the pow call was removed, 0 else.
265 FIRM_API int i_mapper_pow(ir_node *call, void *ctx);
268 * A mapper for the floating point exp(a): floattype exp(floattype a);
270 * @return 1 if the exp call was removed, 0 else.
272 FIRM_API int i_mapper_exp(ir_node *call, void *ctx);
275 * A mapper for the floating point exp2(a): floattype exp2(floattype a);
277 * @return 1 if the exp call was removed, 0 else.
279 FIRM_API int i_mapper_exp2(ir_node *call, void *ctx);
282 * A mapper for the floating point exp10(a): floattype exp10(floattype a);
284 * @return 1 if the exp call was removed, 0 else.
286 FIRM_API int i_mapper_exp10(ir_node *call, void *ctx);
289 * A mapper for the floating point log(a): floattype log(floattype a);
291 * @return 1 if the log call was removed, 0 else.
293 FIRM_API int i_mapper_log(ir_node *call, void *ctx);
296 * A mapper for the floating point log(a): floattype log(floattype a);
298 * @return 1 if the log call was removed, 0 else.
300 FIRM_API int i_mapper_log2(ir_node *call, void *ctx);
303 * A mapper for the floating point log(a): floattype log(floattype a);
305 * @return 1 if the log call was removed, 0 else.
307 FIRM_API int i_mapper_log10(ir_node *call, void *ctx);
310 * A mapper for the floating point sin(a): floattype sin(floattype a);
312 * @return 1 if the sin call was removed, 0 else.
314 FIRM_API int i_mapper_sin(ir_node *call, void *ctx);
317 * A mapper for the floating point sin(a): floattype cos(floattype a);
319 * @return 1 if the cos call was removed, 0 else.
321 FIRM_API int i_mapper_cos(ir_node *call, void *ctx);
324 * A mapper for the floating point tan(a): floattype tan(floattype a);
326 * @return 1 if the tan call was removed, 0 else.
328 FIRM_API int i_mapper_tan(ir_node *call, void *ctx);
331 * A mapper for the floating point asin(a): floattype asin(floattype a);
333 * @return 1 if the asin call was removed, 0 else.
335 FIRM_API int i_mapper_asin(ir_node *call, void *ctx);
338 * A mapper for the floating point acos(a): floattype acos(floattype a);
340 * @return 1 if the tan call was removed, 0 else.
342 FIRM_API int i_mapper_acos(ir_node *call, void *ctx);
345 * A mapper for the floating point atan(a): floattype atan(floattype a);
347 * @return 1 if the atan call was removed, 0 else.
349 FIRM_API int i_mapper_atan(ir_node *call, void *ctx);
352 * A mapper for the floating point sinh(a): floattype sinh(floattype a);
354 * @return 1 if the sinh call was removed, 0 else.
356 FIRM_API int i_mapper_sinh(ir_node *call, void *ctx);
359 * A mapper for the floating point cosh(a): floattype cosh(floattype a);
361 * @return 1 if the cosh call was removed, 0 else.
363 FIRM_API int i_mapper_cosh(ir_node *call, void *ctx);
366 * A mapper for the floating point tanh(a): floattype tanh(floattype a);
368 * @return 1 if the tanh call was removed, 0 else.
370 FIRM_API int i_mapper_tanh(ir_node *call, void *ctx);
373 * A mapper for the strcmp-Function: inttype strcmp(char pointer a, char pointer b);
375 * @return 1 if the strcmp call was removed, 0 else.
377 FIRM_API int i_mapper_strcmp(ir_node *call, void *ctx);
380 * A mapper for the strncmp-Function: inttype strncmp(char pointer a, char pointer b, inttype len);
382 * @return 1 if the strncmp call was removed, 0 else.
384 FIRM_API int i_mapper_strncmp(ir_node *call, void *ctx);
387 * A mapper for the strcpy-Function: char pointer strcpy(char pointer a, char pointer b);
389 * @return 1 if the strcpy call was removed, 0 else.
391 FIRM_API int i_mapper_strcpy(ir_node *call, void *ctx);
394 * A mapper for the strlen-Function: inttype strlen(char pointer a);
396 * @return 1 if the strlen call was removed, 0 else.
398 FIRM_API int i_mapper_strlen(ir_node *call, void *ctx);
401 * A mapper for the memcpy-Function: void pointer memcpy(void pointer d, void pointer s, inttype c);
403 * @return 1 if the memcpy call was removed, 0 else.
405 FIRM_API int i_mapper_memcpy(ir_node *call, void *ctx);
408 * A mapper for the mempcpy-Function: void pointer mempcpy(void pointer d, void pointer s, inttype c);
410 * @return 1 if the mempcpy call was removed, 0 else.
412 FIRM_API int i_mapper_mempcpy(ir_node *call, void *ctx);
415 * A mapper for the memmove-Function: void pointer memmove(void pointer d, void pointer s, inttype c);
417 * @return 1 if the memmove call was removed, 0 else.
419 FIRM_API int i_mapper_memmove(ir_node *call, void *ctx);
422 * A mapper for the memset-Function: void pointer memset(void pointer d, inttype C, inttype len);
424 * @return 1 if the memset call was removed, 0 else.
426 FIRM_API int i_mapper_memset(ir_node *call, void *ctx);
429 * A mapper for the strncmp-Function: inttype memcmp(void pointer a, void pointer b, inttype len);
431 * @return 1 if the strncmp call was removed, 0 else.
433 FIRM_API int i_mapper_memcmp(ir_node *call, void *ctx);
436 * A mapper for the alloca() function: pointer alloca(inttype size)
437 * Replaces the call by a Alloca(stack_alloc) node.
441 FIRM_API int i_mapper_alloca(ir_node *call, void *ctx);
444 * A runtime routine description.
446 typedef struct runtime_rt {
447 ir_entity *ent; /**< The entity representing the runtime routine. */
448 ir_mode *mode; /**< The operation mode of the mapped instruction. */
449 ir_mode *res_mode; /**< The result mode of the mapped instruction or NULL. */
450 long mem_proj_nr; /**< if >= 0, create a memory ProjM() */
451 long regular_proj_nr; /**< if >= 0, create a regular ProjX() */
452 long exc_proj_nr; /**< if >= 0, create a exception ProjX() */
453 long res_proj_nr; /**< if >= 0, first result projection number */
457 * A mapper for mapping unsupported instructions to runtime calls.
458 * Maps a op(arg_0, ..., arg_n) into a call to a runtime function
459 * rt(arg_0, ..., arg_n).
461 * The mapping is only done, if the modes of all arguments matches the
462 * modes of rt's argument.
463 * Further, if op has a memory input, the generated Call uses it, else
465 * The pinned state of the Call will be set to the pinned state of op.
467 * Note that i_mapper_RuntimeCall() must be used with a i_instr_record.
469 * @return 1 if an op was mapped, 0 else
473 * - Maps signed Div nodes to calls to rt_Div():
475 runtime_rt rt_Div = {
476 ent("int rt_Div(int, int)"),
485 i_instr_record map_Div = {
488 i_mapper_RuntimeCall,
494 * - Maps ConvD(F) to calls to rt_Float2Div():
496 runtime_rt rt_Float2Double = {
497 ent("double rt_Float2Div(float)"),
498 get_type_mode("double"),
506 i_instr_record map_Float2Double = {
509 i_mapper_RuntimeCall,
515 FIRM_API int i_mapper_RuntimeCall(ir_node *node, runtime_rt *rt);