| /* |
| * 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_function_inlining.cpp |
| * |
| * Moves constant branches of if statements out to the surrounding |
| * instruction stream. |
| */ |
| |
| #include "ir.h" |
| |
| class ir_if_simplification_visitor : public ir_hierarchical_visitor { |
| public: |
| ir_if_simplification_visitor() |
| { |
| this->made_progress = false; |
| } |
| |
| ir_visitor_status visit_leave(ir_if *); |
| |
| bool made_progress; |
| }; |
| |
| bool |
| do_if_simplification(exec_list *instructions) |
| { |
| ir_if_simplification_visitor v; |
| |
| v.run(instructions); |
| return v.made_progress; |
| } |
| |
| |
| ir_visitor_status |
| ir_if_simplification_visitor::visit_leave(ir_if *ir) |
| { |
| /* FINISHME: Ideally there would be a way to note that the condition results |
| * FINISHME: in a constant before processing both of the other subtrees. |
| * FINISHME: This can probably be done with some flags, but it would take |
| * FINISHME: some work to get right. |
| */ |
| ir_constant *condition_constant = ir->condition->constant_expression_value(); |
| if (condition_constant) { |
| /* Move the contents of the one branch of the conditional |
| * that matters out. |
| */ |
| if (condition_constant->value.b[0]) { |
| foreach_iter(exec_list_iterator, then_iter, ir->then_instructions) { |
| ir_instruction *then_ir = (ir_instruction *)then_iter.get(); |
| ir->insert_before(then_ir); |
| } |
| } else { |
| foreach_iter(exec_list_iterator, else_iter, ir->else_instructions) { |
| ir_instruction *else_ir = (ir_instruction *)else_iter.get(); |
| ir->insert_before(else_ir); |
| } |
| } |
| ir->remove(); |
| this->made_progress = true; |
| } |
| |
| return visit_continue; |
| } |