1/* 2 * Copyright © 2010 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 21 * DEALINGS IN THE SOFTWARE. 22 */ 23 24/** 25 * \file ir_expression_flattening.cpp 26 * 27 * Takes the leaves of expression trees and makes them dereferences of 28 * assignments of the leaves to temporaries, according to a predicate. 29 * 30 * This is used for automatic function inlining, where we want to take 31 * an expression containing a call and move the call out to its own 32 * assignment so that we can inline it at the appropriate place in the 33 * instruction stream. 34 */ 35 36#include "ir.h" 37#include "ir_visitor.h" 38#include "ir_rvalue_visitor.h" 39#include "ir_expression_flattening.h" 40#include "glsl_types.h" 41 42class ir_expression_flattening_visitor : public ir_rvalue_visitor { 43public: 44 ir_expression_flattening_visitor(bool (*predicate)(ir_instruction *ir)) 45 { 46 this->predicate = predicate; 47 } 48 49 virtual ~ir_expression_flattening_visitor() 50 { 51 /* empty */ 52 } 53 54 void handle_rvalue(ir_rvalue **rvalue); 55 bool (*predicate)(ir_instruction *ir); 56}; 57 58void 59do_expression_flattening(exec_list *instructions, 60 bool (*predicate)(ir_instruction *ir)) 61{ 62 ir_expression_flattening_visitor v(predicate); 63 64 foreach_iter(exec_list_iterator, iter, *instructions) { 65 ir_instruction *ir = (ir_instruction *)iter.get(); 66 67 ir->accept(&v); 68 } 69} 70 71void 72ir_expression_flattening_visitor::handle_rvalue(ir_rvalue **rvalue) 73{ 74 ir_variable *var; 75 ir_assignment *assign; 76 ir_rvalue *ir = *rvalue; 77 78 if (!ir || !this->predicate(ir)) 79 return; 80 81 void *ctx = hieralloc_parent(ir); 82 83 var = new(ctx) ir_variable(ir->type, "flattening_tmp", ir_var_temporary); 84 base_ir->insert_before(var); 85 86 assign = new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var), 87 ir, 88 NULL); 89 base_ir->insert_before(assign); 90 91 *rvalue = new(ctx) ir_dereference_variable(var); 92} 93