| /* |
| * Copyright © 2016 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. |
| */ |
| |
| #ifndef OPT_ADD_NEG_TO_SUB_H |
| #define OPT_ADD_NEG_TO_SUB_H |
| |
| #include "ir.h" |
| #include "ir_hierarchical_visitor.h" |
| |
| class add_neg_to_sub_visitor : public ir_hierarchical_visitor { |
| public: |
| add_neg_to_sub_visitor() |
| { |
| /* empty */ |
| } |
| |
| ir_visitor_status visit_leave(ir_expression *ir) |
| { |
| if (ir->operation != ir_binop_add) |
| return visit_continue; |
| |
| for (unsigned i = 0; i < 2; i++) { |
| ir_expression *const op = ir->operands[i]->as_expression(); |
| |
| if (op != NULL && op->operation == ir_unop_neg) { |
| ir->operation = ir_binop_sub; |
| |
| /* This ensures that -a + b becomes b - a. */ |
| if (i == 0) |
| ir->operands[0] = ir->operands[1]; |
| |
| ir->operands[1] = op->operands[0]; |
| break; |
| } |
| } |
| |
| return visit_continue; |
| } |
| }; |
| |
| #endif /* OPT_ADD_NEG_TO_SUB_H */ |