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f45a2a93ae
This just makes the output of the standalone compiler a little more compact. v2: Fix indexing typo noticed by Iago. Move the add_neg_to_sub_visitor to it's own header file. Add a unit test that exercises the visitor. Both the neg_a_plus_b and neg_a_plus_neg_b tests reproduced the bug that Iago discovered. Signed-off-by: Ian Romanick <ian.d.romanick@intel.com> Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
61 lines
2 KiB
C++
61 lines
2 KiB
C++
/*
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* Copyright © 2016 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef OPT_ADD_NEG_TO_SUB_H
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#define OPT_ADD_NEG_TO_SUB_H
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#include "ir.h"
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#include "ir_hierarchical_visitor.h"
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class add_neg_to_sub_visitor : public ir_hierarchical_visitor {
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public:
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add_neg_to_sub_visitor()
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{
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/* empty */
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}
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ir_visitor_status visit_leave(ir_expression *ir)
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{
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if (ir->operation != ir_binop_add)
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return visit_continue;
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for (unsigned i = 0; i < 2; i++) {
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ir_expression *const op = ir->operands[i]->as_expression();
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if (op != NULL && op->operation == ir_unop_neg) {
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ir->operation = ir_binop_sub;
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/* This ensures that -a + b becomes b - a. */
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if (i == 0)
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ir->operands[0] = ir->operands[1];
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ir->operands[1] = op->operands[0];
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break;
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}
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}
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return visit_continue;
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}
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};
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#endif /* OPT_ADD_NEG_TO_SUB_H */
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