From: Eric Anholt Date: Tue, 4 May 2010 20:04:40 +0000 (-0700) Subject: ir_copy_propagation: New pass to rewrite dereferences to avoid copies. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=5c89f0ecb9581cbe83442ab3f41f2f3701fffab0;p=mesa.git ir_copy_propagation: New pass to rewrite dereferences to avoid copies. This is pretty basic. Right now it only handles pure assignments -- same type on each side, no swizzling, and only within basic blocks. --- diff --git a/Makefile.am b/Makefile.am index 4044cc076d7..49c3f4d7b27 100644 --- a/Makefile.am +++ b/Makefile.am @@ -30,14 +30,20 @@ glsl_SOURCES = \ ast_expr.cpp ast_to_hir.cpp ast_function.cpp ast_type.cpp \ ir.cpp hir_field_selection.cpp builtin_function.cpp \ ir_print_visitor.cpp ir_variable.cpp ir_function.cpp \ + ir_basic_block.cpp \ + ir_basic_block.h \ ir_constant_expression.cpp \ ir_constant_folding.cpp \ + ir_copy_propagation.cpp \ + ir_copy_propagation.h \ ir_dead_code.cpp \ ir_expression_flattening.cpp \ ir_function_can_inline.cpp \ ir_function_inlining.cpp \ ir_if_simplification.cpp \ - ir_reader.cpp s_expression.cpp + ir_reader.cpp s_expression.cpp \ + ir_visit_tree.cpp \ + ir_visit_tree.h BUILT_SOURCES = glsl_parser.h glsl_parser.cpp glsl_lexer.cpp CLEANFILES = $(BUILT_SOURCES) diff --git a/glsl_parser_extras.cpp b/glsl_parser_extras.cpp index 88767af2049..31fa5e6c7d0 100644 --- a/glsl_parser_extras.cpp +++ b/glsl_parser_extras.cpp @@ -35,6 +35,7 @@ #include "glsl_parser_extras.h" #include "glsl_parser.h" #include "ir_constant_folding.h" +#include "ir_copy_propagation.h" #include "ir_dead_code.h" #include "ir_function_inlining.h" #include "ir_if_simplification.h" @@ -786,6 +787,7 @@ main(int argc, char **argv) progress = do_function_inlining(&instructions) || progress; progress = do_if_simplification(&instructions) || progress; + progress = do_copy_propagation(&instructions) || progress; progress = do_dead_code_unlinked(&instructions) || progress; /* Constant folding */ diff --git a/ir.h b/ir.h index ce924206f8a..d8568a8dae7 100644 --- a/ir.h +++ b/ir.h @@ -62,6 +62,7 @@ public: virtual class ir_return * as_return() { return NULL; } virtual class ir_if * as_if() { return NULL; } virtual class ir_swizzle * as_swizzle() { return NULL; } + virtual class ir_constant * as_constant() { return NULL; } /*@}*/ protected: @@ -787,6 +788,11 @@ public: ir_constant(int i); ir_constant(float f); + virtual ir_constant *as_constant() + { + return this; + } + virtual void accept(ir_visitor *v) { v->visit(this); diff --git a/ir_basic_block.cpp b/ir_basic_block.cpp new file mode 100644 index 00000000000..b10a25c5353 --- /dev/null +++ b/ir_basic_block.cpp @@ -0,0 +1,136 @@ +/* + * Copyright © 2010 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + +/** + * \file ir_basic_block.cpp + * + * Basic block analysis of instruction streams. + */ + +#include +#include "ir.h" +#include "ir_visitor.h" +#include "ir_visit_tree.h" +#include "ir_basic_block.h" +#include "glsl_types.h" + +static void +has_call_callback(ir_instruction *ir, void *data) +{ + bool *has_call = (bool *)data; + + *has_call = *has_call || ir->as_call(); +} + +/** + * Calls a user function for every basic block in the instruction stream. + * + * Basic block analysis is pretty easy in our IR thanks to the lack of + * unstructured control flow. We've got: + * + * ir_loop (for () {}, while () {}, do {} while ()) + * ir_loop_jump ( + * ir_if () {} + * ir_return + * ir_call() + * + * Note that the basic blocks returned by this don't encompass all + * operations performed by the program -- for example, if conditions + * don't get returned, nor do the assignments that will be generated + * for ir_call parameters. + */ +void call_for_basic_blocks(exec_list *instructions, + void (*callback)(ir_instruction *first, + ir_instruction *last)) +{ + ir_instruction *leader = NULL; + ir_instruction *last = NULL; + + foreach_iter(exec_list_iterator, iter, *instructions) { + ir_instruction *ir = (ir_instruction *)iter.get(); + ir_if *ir_if; + ir_loop *ir_loop; + ir_function *ir_function; + + if (!leader) + leader = ir; + + if ((ir_if = ir->as_if())) { + callback(leader, ir); + leader = NULL; + + call_for_basic_blocks(&ir_if->then_instructions, callback); + call_for_basic_blocks(&ir_if->else_instructions, callback); + } else if ((ir_loop = ir->as_loop())) { + callback(leader, ir); + leader = NULL; + call_for_basic_blocks(&ir_loop->body_instructions, callback); + } else if (ir->as_return() || ir->as_call()) { + callback(leader, ir); + leader = NULL; + } else if ((ir_function = ir->as_function())) { + /* A function definition doesn't interrupt our basic block + * since execution doesn't go into it. We should process the + * bodies of its signatures for BBs, though. + * + * Note that we miss an opportunity for producing more + * maximal BBs between the instructions that precede main() + * and the body of main(). Perhaps those instructions ought + * to live inside of main(). + */ + foreach_iter(exec_list_iterator, fun_iter, *ir_function) { + ir_function_signature *ir_sig; + + ir_sig = (ir_function_signature *)fun_iter.get(); + + call_for_basic_blocks(&ir_sig->body, callback); + } + } else if (ir->as_assignment()) { + bool has_call = false; + + /* If there's a call in the expression tree being assigned, + * then that ends the BB too. + * + * The assumption is that any consumer of the basic block + * walker is fine with the fact that the call is somewhere in + * the tree even if portions of the tree may be evaluated + * after the call. + * + * A consumer that has an issue with this could not process + * the last instruction of the basic block. If doing so, + * expression flattener may be useful before using the basic + * block finder to get more maximal basic blocks out. + */ + ir_visit_tree(ir, has_call_callback, &has_call); + + if (has_call) { + callback(leader, ir); + leader = NULL; + } + } + last = ir; + } + if (leader) { + callback(leader, last); + } +} diff --git a/ir_basic_block.h b/ir_basic_block.h new file mode 100644 index 00000000000..e7993b3b04a --- /dev/null +++ b/ir_basic_block.h @@ -0,0 +1,26 @@ +/* + * Copyright © 2010 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + +void call_for_basic_blocks(exec_list *instructions, + void (*callback)(ir_instruction *first, + ir_instruction *last)); diff --git a/ir_copy_propagation.cpp b/ir_copy_propagation.cpp new file mode 100644 index 00000000000..8eb1ebde38c --- /dev/null +++ b/ir_copy_propagation.cpp @@ -0,0 +1,313 @@ +/* + * Copyright © 2010 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + +/** + * \file ir_dead_code.cpp + * + * Eliminates dead assignments and variable declarations from the code. + */ + +#include +#include "ir.h" +#include "ir_visitor.h" +#include "ir_basic_block.h" +#include "ir_copy_propagation.h" +#include "glsl_types.h" + +class acp_entry : public exec_node +{ +public: + acp_entry(ir_variable *lhs, ir_variable *rhs) + { + assert(lhs); + assert(rhs); + this->lhs = lhs; + this->rhs = rhs; + } + + ir_variable *lhs; + ir_variable *rhs; +}; + +class ir_copy_propagation_visitor : public ir_visitor { +public: + ir_copy_propagation_visitor(exec_list *acp) + { + progress = false; + this->acp = acp; + } + + /** + * \name Visit methods + * + * As typical for the visitor pattern, there must be one \c visit method for + * each concrete subclass of \c ir_instruction. Virtual base classes within + * the hierarchy should not have \c visit methods. + */ + /*@{*/ + virtual void visit(ir_variable *); + virtual void visit(ir_loop *); + virtual void visit(ir_loop_jump *); + virtual void visit(ir_function_signature *); + virtual void visit(ir_function *); + virtual void visit(ir_expression *); + virtual void visit(ir_swizzle *); + virtual void visit(ir_dereference *); + virtual void visit(ir_assignment *); + virtual void visit(ir_constant *); + virtual void visit(ir_call *); + virtual void visit(ir_return *); + virtual void visit(ir_if *); + /*@}*/ + + /** List of acp_entry */ + exec_list *acp; + bool progress; +}; + + +void +ir_copy_propagation_visitor::visit(ir_variable *ir) +{ + (void)ir; +} + + +void +ir_copy_propagation_visitor::visit(ir_loop *ir) +{ + (void)ir; +} + +void +ir_copy_propagation_visitor::visit(ir_loop_jump *ir) +{ + (void) ir; +} + + +void +ir_copy_propagation_visitor::visit(ir_function_signature *ir) +{ + (void)ir; +} + +void +ir_copy_propagation_visitor::visit(ir_function *ir) +{ + (void) ir; +} + +void +ir_copy_propagation_visitor::visit(ir_expression *ir) +{ + unsigned int operand; + + for (operand = 0; operand < ir->get_num_operands(); operand++) { + ir->operands[operand]->accept(this); + } +} + + +void +ir_copy_propagation_visitor::visit(ir_swizzle *ir) +{ + ir->val->accept(this); +} + +/** + * Replaces dereferences of ACP RHS variables with ACP LHS variables. + * + * This is where the actual copy propagation occurs. Note that the + * rewriting of ir_dereference means that the ir_dereference instance + * must not be shared by multiple IR operations! + */ +void +ir_copy_propagation_visitor::visit(ir_dereference *ir) +{ + ir_variable *var; + + if (ir->mode == ir_dereference::ir_reference_array) { + ir->selector.array_index->accept(this); + } + + var = ir->var->as_variable(); + if (var) { + foreach_iter(exec_list_iterator, iter, *this->acp) { + acp_entry *entry = (acp_entry *)iter.get(); + + if (var == entry->lhs) { + ir->var = entry->rhs; + this->progress = true; + break; + } + } + } else { + ir->var->accept(this); + } +} + +void +ir_copy_propagation_visitor::visit(ir_assignment *ir) +{ + if (ir->condition) + ir->condition->accept(this); + + /* Ignores the LHS. Don't want to rewrite the LHS to point at some + * other storage! + */ + + ir->rhs->accept(this); +} + + +void +ir_copy_propagation_visitor::visit(ir_constant *ir) +{ + (void) ir; +} + + +void +ir_copy_propagation_visitor::visit(ir_call *ir) +{ + (void)ir; + + /* Note, if we were to do copy propagation to parameters of calls, we'd + * have to be careful about out params. + */ +} + + +void +ir_copy_propagation_visitor::visit(ir_return *ir) +{ + ir_rvalue *val = ir->get_value(); + + if (val) + val->accept(this); +} + + +void +ir_copy_propagation_visitor::visit(ir_if *ir) +{ + ir->condition->accept(this); +} + +static void +propagate_copies(ir_instruction *ir, exec_list *acp) +{ + ir_copy_propagation_visitor v(acp); + + ir->accept(&v); +} + +static void +kill_invalidated_copies(ir_assignment *ir, exec_list *acp) +{ + ir_dereference *lhs_deref = ir->lhs->as_dereference(); + + /* Only handle simple dereferences for now. */ + if (lhs_deref && + lhs_deref->mode == ir_dereference::ir_reference_variable) { + ir_variable *var = lhs_deref->var->as_variable(); + + foreach_iter(exec_list_iterator, iter, *acp) { + acp_entry *entry = (acp_entry *)iter.get(); + + if (entry->lhs == var || entry->rhs == var) { + entry->remove(); + } + } + } else { + /* FINISHME: Only clear out the entries we overwrote here. */ + acp->make_empty(); + } +} + +/** + * Adds an entry to the available copy list if it's a plain assignment + * of a variable to a variable. + */ +static void +add_copy(ir_assignment *ir, exec_list *acp) +{ + acp_entry *entry; + + if (ir->condition) { + ir_constant *condition = ir->condition->as_constant(); + if (!condition || !condition->value.b[0]) + return; + } + + ir_dereference *lhs_deref = ir->lhs->as_dereference(); + if (!lhs_deref || lhs_deref->mode != ir_dereference::ir_reference_variable) + return; + ir_variable *lhs_var = lhs_deref->var->as_variable(); + + ir_dereference *rhs_deref = ir->rhs->as_dereference(); + if (!rhs_deref || rhs_deref->mode != ir_dereference::ir_reference_variable) + return; + ir_variable *rhs_var = rhs_deref->var->as_variable(); + + entry = new acp_entry(lhs_var, rhs_var); + acp->push_tail(entry); +} + +static void +copy_propagation_basic_block(ir_instruction *first, + ir_instruction *last) +{ + ir_instruction *ir; + /* List of avaialble_copy */ + exec_list acp; + + for (ir = first;; ir = (ir_instruction *)ir->next) { + ir_assignment *ir_assign = ir->as_assignment(); + + propagate_copies(ir, &acp); + + if (ir_assign) { + kill_invalidated_copies(ir_assign, &acp); + + add_copy(ir_assign, &acp); + } + if (ir == last) + break; + } +} + +/** + * Does a copy propagation pass on the code present in the instruction stream. + */ +bool +do_copy_propagation(exec_list *instructions) +{ + bool progress = false; + + call_for_basic_blocks(instructions, copy_propagation_basic_block); + + /* FINISHME: Return a legit progress value. */ + return progress; +} diff --git a/ir_copy_propagation.h b/ir_copy_propagation.h new file mode 100644 index 00000000000..cfb0f63250a --- /dev/null +++ b/ir_copy_propagation.h @@ -0,0 +1,24 @@ +/* + * Copyright © 2010 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + +bool do_copy_propagation(exec_list *instructions); diff --git a/ir_visit_tree.cpp b/ir_visit_tree.cpp new file mode 100644 index 00000000000..89def6a9205 --- /dev/null +++ b/ir_visit_tree.cpp @@ -0,0 +1,207 @@ +/* + * Copyright © 2010 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + +/** + * \file ir_dead_code.cpp + * + * Eliminates dead assignments and variable declarations from the code. + */ + +#define NULL 0 +#include "ir.h" +#include "ir_visitor.h" +#include "ir_visit_tree.h" + +class ir_tree_visitor : public ir_visitor { +public: + + /** + * \name Visit methods + * + * As typical for the visitor pattern, there must be one \c visit method for + * each concrete subclass of \c ir_instruction. Virtual base classes within + * the hierarchy should not have \c visit methods. + */ + /*@{*/ + virtual void visit(ir_variable *); + virtual void visit(ir_loop *); + virtual void visit(ir_loop_jump *); + virtual void visit(ir_function_signature *); + virtual void visit(ir_function *); + virtual void visit(ir_expression *); + virtual void visit(ir_swizzle *); + virtual void visit(ir_dereference *); + virtual void visit(ir_assignment *); + virtual void visit(ir_constant *); + virtual void visit(ir_call *); + virtual void visit(ir_return *); + virtual void visit(ir_if *); + /*@}*/ + + void (*callback)(ir_instruction *ir, void *data); + void *data; +}; + +void +ir_tree_visitor::visit(ir_variable *ir) +{ + this->callback(ir, this->data); +} + + +void +ir_tree_visitor::visit(ir_loop *ir) +{ + this->callback(ir, this->data); + + visit_exec_list(&ir->body_instructions, this); + if (ir->from) + ir->from->accept(this); + if (ir->to) + ir->to->accept(this); + if (ir->increment) + ir->increment->accept(this); +} + +void +ir_tree_visitor::visit(ir_loop_jump *ir) +{ + this->callback(ir, this->data); +} + + +void +ir_tree_visitor::visit(ir_function_signature *ir) +{ + this->callback(ir, this->data); + + visit_exec_list(&ir->body, this); +} + +void +ir_tree_visitor::visit(ir_function *ir) +{ + this->callback(ir, this->data); + + /* FINISHME: Do we want to walk into functions? */ +} + +void +ir_tree_visitor::visit(ir_expression *ir) +{ + unsigned int operand; + + this->callback(ir, this->data); + + for (operand = 0; operand < ir->get_num_operands(); operand++) { + ir->operands[operand]->accept(this); + } +} + + +void +ir_tree_visitor::visit(ir_swizzle *ir) +{ + this->callback(ir, this->data); + + ir->val->accept(this); +} + + +void +ir_tree_visitor::visit(ir_dereference *ir) +{ + this->callback(ir, this->data); + + if (ir->mode == ir_dereference::ir_reference_array) { + ir->selector.array_index->accept(this); + } +} + +void +ir_tree_visitor::visit(ir_assignment *ir) +{ + this->callback(ir, this->data); + + ir->lhs->accept(this); + ir->rhs->accept(this); + if (ir->condition) + ir->condition->accept(this); +} + + +void +ir_tree_visitor::visit(ir_constant *ir) +{ + this->callback(ir, this->data); +} + + +void +ir_tree_visitor::visit(ir_call *ir) +{ + this->callback(ir, this->data); + + foreach_iter(exec_list_iterator, iter, *ir) { + ir_rvalue *param = (ir_rvalue *)iter.get(); + + param->accept(this); + } +} + + +void +ir_tree_visitor::visit(ir_return *ir) +{ + ir_rvalue *val = ir->get_value(); + + this->callback(ir, this->data); + + if (val) + val->accept(this); +} + + +void +ir_tree_visitor::visit(ir_if *ir) +{ + this->callback(ir, this->data); + + ir->condition->accept(this); + + visit_exec_list(&ir->then_instructions, this); + visit_exec_list(&ir->else_instructions, this); +} + +void ir_visit_tree(ir_instruction *ir, + void (*callback)(ir_instruction *ir, + void *data), + void *data) +{ + ir_tree_visitor v; + v.callback = callback; + v.data = data; + + ir->accept(&v); +} + diff --git a/ir_visit_tree.h b/ir_visit_tree.h new file mode 100644 index 00000000000..24672783ef7 --- /dev/null +++ b/ir_visit_tree.h @@ -0,0 +1,27 @@ +/* + * Copyright © 2010 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + +void ir_visit_tree(ir_instruction *ir, + void (*callback)(ir_instruction *ir, + void *data), + void *data);