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5854d4583c
All the current HW backends transform subtract to adding the negation, so I haven't bothered peepholing it back out in Mesa IR. This allows some subtract of subtract to get removed in ir_algebraic.
76 lines
2.3 KiB
C++
76 lines
2.3 KiB
C++
/*
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* Copyright © 2010 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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/**
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* \file ir_sub_to_add_neg.cpp
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*
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* Breaks an ir_binop_sub expression down to add(op0, neg(op1))
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*
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* This simplifies expression reassociation, and for many backends
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* there is no subtract operation separate from adding the negation.
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* For backends with native subtract operations, they will probably
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* want to recognize add(op0, neg(op1)) or the other way around to
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* produce a subtract anyway.
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*/
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#include "ir.h"
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class ir_sub_to_add_neg_visitor : public ir_hierarchical_visitor {
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public:
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ir_sub_to_add_neg_visitor()
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{
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this->progress = false;
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}
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ir_visitor_status visit_leave(ir_expression *);
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bool progress;
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};
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bool
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do_sub_to_add_neg(exec_list *instructions)
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{
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ir_sub_to_add_neg_visitor v;
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visit_list_elements(&v, instructions);
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return v.progress;
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}
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ir_visitor_status
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ir_sub_to_add_neg_visitor::visit_leave(ir_expression *ir)
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{
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if (ir->operation != ir_binop_sub)
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return visit_continue;
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void *mem_ctx = talloc_parent(ir);
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ir->operation = ir_binop_add;
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ir->operands[1] = new(mem_ctx) ir_expression(ir_unop_neg,
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ir->operands[1]->type,
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ir->operands[1],
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NULL);
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this->progress = true;
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return visit_continue;
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}
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