2 * This file is part of libFirm.
3 * Copyright (C) 2012 University of Karlsruhe.
8 * @brief Lowering of high level constructs.
11 #ifndef FIRM_LOWERING_H
12 #define FIRM_LOWERING_H
16 #include "firm_types.h"
21 * @defgroup ir_lowering Lowering
23 * Lowering is the process of transforming a highlevel representation
24 * (a representation closer to the sourcecode) into a lower-level representation
25 * (something closer to the target machine).
31 * Lower small CopyB nodes to Load/Store nodes, preserve medium-sized CopyB
32 * nodes and replace large CopyBs by a call to memcpy, depending on the given
35 * Small CopyB nodes (size <= max_small_size) are turned into a series of
37 * Medium-sized CopyB nodes (max_small_size < size < min_large_size) are
39 * Large CopyB nodes (size >= min_large_size) are turned into a memcpy call.
41 * @param irg The graph to be lowered.
42 * @param max_small_size The maximum number of bytes for a CopyB node so
43 * that it is still considered 'small'.
44 * @param min_large_size The minimum number of bytes for a CopyB node so
45 * that it is regarded as 'large'.
46 * @param allow_misalignments Backend can handle misaligned loads and stores.
48 FIRM_API void lower_CopyB(ir_graph *irg, unsigned max_small_size,
49 unsigned min_large_size, int allow_misalignments);
52 * Lowers all Switches (Cond nodes with non-boolean mode) depending on spare_size.
53 * They will either remain the same or be converted into if-cascades.
55 * @param irg The ir graph to be lowered.
56 * @param small_switch If switch has <= cases then change it to an if-cascade.
57 * @param spare_size Allowed spare size for table switches in machine words.
58 * (Default in edgfe: 128)
59 * @param selector_mode mode which must be used for Switch selector
61 FIRM_API void lower_switch(ir_graph *irg, unsigned small_switch,
62 unsigned spare_size, ir_mode *selector_mode);
65 * Replaces SymConsts by a real constant if possible.
66 * Replaces Sel nodes by address computation. Also resolves array access.
67 * Handle bit fields by added And/Or calculations.
69 * @param irg the graph to lower
71 * @note: There is NO lowering ob objects oriented types. This is highly compiler
72 * and ABI specific and should be placed directly in the compiler.
74 FIRM_API void lower_highlevel_graph(ir_graph *irg);
77 * Creates an ir_graph pass for lower_highlevel_graph().
79 * @param name the name of this pass or NULL
81 * @return the newly created ir_graph pass
83 FIRM_API ir_graph_pass_t *lower_highlevel_graph_pass(const char *name);
86 * Replaces SymConsts by a real constant if possible.
87 * Replaces Sel nodes by address computation. Also resolves array access.
88 * Handle bit fields by added And/Or calculations.
91 * @note There is NO lowering of objects oriented types. This is highly compiler
92 * and ABI specific and should be placed directly in the compiler.
94 FIRM_API void lower_highlevel(void);
97 * does the same as lower_highlevel for all nodes on the const code irg
99 FIRM_API void lower_const_code(void);
102 * Creates an ir_prog pass for lower_const_code().
104 * @param name the name of this pass or NULL
106 * @return the newly created ir_prog pass
108 FIRM_API ir_prog_pass_t *lower_const_code_pass(const char *name);
111 * Used as callback, whenever a lowerable mux is found. The return value
112 * indicates, whether the mux should be lowered. This may be used, to lower
113 * floating point muxes, while keeping mux nodes for integers, for example.
115 * @param mux The mux node that may be lowered.
116 * @return A non-zero value indicates that the mux should be lowered.
118 typedef int lower_mux_callback(ir_node* mux);
121 * Lowers all mux nodes in the given graph. A callback function may be
122 * given, to select the mux nodes to lower.
124 * @param irg The graph to lower mux nodes in.
125 * @param cb_func The callback function for mux selection. Can be NULL,
126 * to lower all mux nodes.
128 FIRM_API void lower_mux(ir_graph *irg, lower_mux_callback *cb_func);
131 * Creates an ir_graph pass for lower_mux().
133 * @param name the name of this pass or NULL
134 * @param cb_func The callback function for mux selection. Can be NULL,
135 * to lower all mux nodes.
137 * @return the newly created ir_graph pass
139 FIRM_API ir_graph_pass_t *lower_mux_pass(const char *name,
140 lower_mux_callback *cb_func);
143 * An intrinsic mapper function.
145 * @param node the IR-node that will be mapped
146 * @param ctx a context
148 * @return non-zero if the call was mapped
150 typedef int (*i_mapper_func)(ir_node *node, void *ctx);
152 /** kind of an instruction record
155 INTRINSIC_CALL = 0, /**< the record represents an intrinsic call */
156 INTRINSIC_INSTR /**< the record represents an intrinsic instruction */
160 * An intrinsic call record.
162 typedef struct i_call_record {
163 enum ikind kind; /**< must be INTRINSIC_CALL */
164 ir_entity *i_ent; /**< the entity representing an intrinsic call */
165 i_mapper_func i_mapper; /**< the mapper function to call */
166 void *ctx; /**< mapper context */
167 void *link; /**< used in the construction algorithm, must be NULL */
171 * An intrinsic instruction record.
173 typedef struct i_instr_record {
174 enum ikind kind; /**< must be INTRINSIC_INSTR */
175 ir_op *op; /**< the opcode that must be mapped. */
176 i_mapper_func i_mapper; /**< the mapper function to call */
177 void *ctx; /**< mapper context */
178 void *link; /**< used in the construction algorithm, must be NULL */
182 * An intrinsic record.
184 typedef union i_record {
185 enum ikind kind; /**< kind of record */
186 i_call_record i_call; /**< used for call records */
187 i_instr_record i_instr; /**< used for isnstruction records */
191 * Go through all graphs and map calls to intrinsic functions and instructions.
193 * Every call or instruction is reported to its mapper function,
194 * which is responsible for rebuilding the graph.
196 * @param list an array of intrinsic map records
197 * @param length the length of the array
198 * @param part_block_used set to true if part_block() must be using during lowering
200 * @return number of found intrinsics.
202 FIRM_API size_t lower_intrinsics(i_record *list, size_t length,
203 int part_block_used);
206 * Creates an irprog pass for lower_intrinsics.
208 * @param name the name of this pass or NULL
209 * @param list an array of intrinsic map records
210 * @param length the length of the array
211 * @param part_block_used set to true if part_block() must be using during lowering
213 FIRM_API ir_prog_pass_t *lower_intrinsics_pass(const char *name, i_record *list,
214 size_t length, int part_block_used);
217 * A mapper for the integer/float absolute value: type abs(type v).
218 * Replaces the call by a Abs node.
222 FIRM_API int i_mapper_abs(ir_node *call, void *ctx);
225 * A mapper for the integer byte swap value: type bswap(type v).
226 * Replaces the call by a builtin[ir_bk_bswap] node.
230 FIRM_API int i_mapper_bswap(ir_node *call, void *ctx);
233 * A mapper for the floating point sqrt(v): floattype sqrt(floattype v);
235 * @return 1 if the sqrt call was removed, 0 else.
237 FIRM_API int i_mapper_sqrt(ir_node *call, void *ctx);
240 * A mapper for the floating point cbrt(v): floattype sqrt(floattype v);
242 * @return 1 if the cbrt call was removed, 0 else.
244 FIRM_API int i_mapper_cbrt(ir_node *call, void *ctx);
247 * A mapper for the floating point pow(a, b): floattype pow(floattype a, floattype b);
249 * @return 1 if the pow call was removed, 0 else.
251 FIRM_API int i_mapper_pow(ir_node *call, void *ctx);
254 * A mapper for the floating point exp(a): floattype exp(floattype a);
256 * @return 1 if the exp call was removed, 0 else.
258 FIRM_API int i_mapper_exp(ir_node *call, void *ctx);
261 * A mapper for the floating point exp2(a): floattype exp2(floattype a);
263 * @return 1 if the exp call was removed, 0 else.
265 FIRM_API int i_mapper_exp2(ir_node *call, void *ctx);
268 * A mapper for the floating point exp10(a): floattype exp10(floattype a);
270 * @return 1 if the exp call was removed, 0 else.
272 FIRM_API int i_mapper_exp10(ir_node *call, void *ctx);
275 * A mapper for the floating point log(a): floattype log(floattype a);
277 * @return 1 if the log call was removed, 0 else.
279 FIRM_API int i_mapper_log(ir_node *call, void *ctx);
282 * A mapper for the floating point log(a): floattype log(floattype a);
284 * @return 1 if the log call was removed, 0 else.
286 FIRM_API int i_mapper_log2(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_log10(ir_node *call, void *ctx);
296 * A mapper for the floating point sin(a): floattype sin(floattype a);
298 * @return 1 if the sin call was removed, 0 else.
300 FIRM_API int i_mapper_sin(ir_node *call, void *ctx);
303 * A mapper for the floating point sin(a): floattype cos(floattype a);
305 * @return 1 if the cos call was removed, 0 else.
307 FIRM_API int i_mapper_cos(ir_node *call, void *ctx);
310 * A mapper for the floating point tan(a): floattype tan(floattype a);
312 * @return 1 if the tan call was removed, 0 else.
314 FIRM_API int i_mapper_tan(ir_node *call, void *ctx);
317 * A mapper for the floating point asin(a): floattype asin(floattype a);
319 * @return 1 if the asin call was removed, 0 else.
321 FIRM_API int i_mapper_asin(ir_node *call, void *ctx);
324 * A mapper for the floating point acos(a): floattype acos(floattype a);
326 * @return 1 if the tan call was removed, 0 else.
328 FIRM_API int i_mapper_acos(ir_node *call, void *ctx);
331 * A mapper for the floating point atan(a): floattype atan(floattype a);
333 * @return 1 if the atan call was removed, 0 else.
335 FIRM_API int i_mapper_atan(ir_node *call, void *ctx);
338 * A mapper for the floating point sinh(a): floattype sinh(floattype a);
340 * @return 1 if the sinh call was removed, 0 else.
342 FIRM_API int i_mapper_sinh(ir_node *call, void *ctx);
345 * A mapper for the floating point cosh(a): floattype cosh(floattype a);
347 * @return 1 if the cosh call was removed, 0 else.
349 FIRM_API int i_mapper_cosh(ir_node *call, void *ctx);
352 * A mapper for the floating point tanh(a): floattype tanh(floattype a);
354 * @return 1 if the tanh call was removed, 0 else.
356 FIRM_API int i_mapper_tanh(ir_node *call, void *ctx);
359 * A mapper for the strcmp-Function: inttype strcmp(char pointer a, char pointer b);
361 * @return 1 if the strcmp call was removed, 0 else.
363 FIRM_API int i_mapper_strcmp(ir_node *call, void *ctx);
366 * A mapper for the strncmp-Function: inttype strncmp(char pointer a, char pointer b, inttype len);
368 * @return 1 if the strncmp call was removed, 0 else.
370 FIRM_API int i_mapper_strncmp(ir_node *call, void *ctx);
373 * A mapper for the strcpy-Function: char pointer strcpy(char pointer a, char pointer b);
375 * @return 1 if the strcpy call was removed, 0 else.
377 FIRM_API int i_mapper_strcpy(ir_node *call, void *ctx);
380 * A mapper for the strlen-Function: inttype strlen(char pointer a);
382 * @return 1 if the strlen call was removed, 0 else.
384 FIRM_API int i_mapper_strlen(ir_node *call, void *ctx);
387 * A mapper for the memcpy-Function: void pointer memcpy(void pointer d, void pointer s, inttype c);
389 * @return 1 if the memcpy call was removed, 0 else.
391 FIRM_API int i_mapper_memcpy(ir_node *call, void *ctx);
394 * A mapper for the mempcpy-Function: void pointer mempcpy(void pointer d, void pointer s, inttype c);
396 * @return 1 if the mempcpy call was removed, 0 else.
398 FIRM_API int i_mapper_mempcpy(ir_node *call, void *ctx);
401 * A mapper for the memmove-Function: void pointer memmove(void pointer d, void pointer s, inttype c);
403 * @return 1 if the memmove call was removed, 0 else.
405 FIRM_API int i_mapper_memmove(ir_node *call, void *ctx);
408 * A mapper for the memset-Function: void pointer memset(void pointer d, inttype C, inttype len);
410 * @return 1 if the memset call was removed, 0 else.
412 FIRM_API int i_mapper_memset(ir_node *call, void *ctx);
415 * A mapper for the strncmp-Function: inttype memcmp(void pointer a, void pointer b, inttype len);
417 * @return 1 if the strncmp call was removed, 0 else.
419 FIRM_API int i_mapper_memcmp(ir_node *call, void *ctx);
422 * A mapper for the alloca() function: pointer alloca(inttype size)
423 * Replaces the call by a Alloca(stack_alloc) node.
427 FIRM_API int i_mapper_alloca(ir_node *call, void *ctx);
430 * A runtime routine description.
432 typedef struct runtime_rt {
433 ir_entity *ent; /**< The entity representing the runtime routine. */
434 ir_mode *mode; /**< The operation mode of the mapped instruction. */
435 ir_mode *res_mode; /**< The result mode of the mapped instruction or NULL. */
436 long mem_proj_nr; /**< if >= 0, create a memory ProjM() */
437 long regular_proj_nr; /**< if >= 0, create a regular ProjX() */
438 long exc_proj_nr; /**< if >= 0, create a exception ProjX() */
439 long res_proj_nr; /**< if >= 0, first result projection number */
443 * A mapper for mapping unsupported instructions to runtime calls.
444 * Maps a op(arg_0, ..., arg_n) into a call to a runtime function
445 * rt(arg_0, ..., arg_n).
447 * The mapping is only done, if the modes of all arguments matches the
448 * modes of rt's argument.
449 * Further, if op has a memory input, the generated Call uses it, else
451 * The pinned state of the Call will be set to the pinned state of op.
453 * Note that i_mapper_RuntimeCall() must be used with a i_instr_record.
455 * @return 1 if an op was mapped, 0 else
459 * - Maps signed Div nodes to calls to rt_Div():
461 runtime_rt rt_Div = {
462 ent("int rt_Div(int, int)"),
471 i_instr_record map_Div = {
474 i_mapper_RuntimeCall,
480 * - Maps ConvD(F) to calls to rt_Float2Div():
482 runtime_rt rt_Float2Double = {
483 ent("double rt_Float2Div(float)"),
484 get_type_mode("double"),
492 i_instr_record map_Float2Double = {
495 i_mapper_RuntimeCall,
501 FIRM_API int i_mapper_RuntimeCall(ir_node *node, runtime_rt *rt);