| 0,0 → 1,81 |
|---|
| /* |
| * Copyright © 2014 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 opt_conditional_discard.cpp |
| * |
| * Replace |
| * |
| * if (cond) discard; |
| * |
| * with |
| * |
| * (discard <condition>) |
| */ |
| |
| #include "glsl_types.h" |
| #include "ir.h" |
| |
| namespace { |
| |
| class opt_conditional_discard_visitor : public ir_hierarchical_visitor { |
| public: |
| opt_conditional_discard_visitor() |
| { |
| progress = false; |
| } |
| |
| ir_visitor_status visit_leave(ir_if *); |
| |
| bool progress; |
| }; |
| |
| } /* anonymous namespace */ |
| |
| bool |
| opt_conditional_discard(exec_list *instructions) |
| { |
| opt_conditional_discard_visitor v; |
| v.run(instructions); |
| return v.progress; |
| } |
| |
| ir_visitor_status |
| opt_conditional_discard_visitor::visit_leave(ir_if *ir) |
| { |
| /* Look for "if (...) discard" with no else clause or extra statements. */ |
| if (ir->then_instructions.is_empty() || |
| !ir->then_instructions.head->next->is_tail_sentinel() || |
| !((ir_instruction *) ir->then_instructions.head)->as_discard() || |
| !ir->else_instructions.is_empty()) |
| return visit_continue; |
| |
| /* Move the condition and replace the ir_if with the ir_discard. */ |
| ir_discard *discard = (ir_discard *) ir->then_instructions.head; |
| discard->condition = ir->condition; |
| ir->replace_with(discard); |
| |
| progress = true; |
| |
| return visit_continue; |
| } |