forked from KolibriOS/kolibrios
72 lines
2.1 KiB
C++
72 lines
2.1 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 lower_noise.cpp
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* IR lower pass to remove noise opcodes.
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*
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* \author Ian Romanick <ian.d.romanick@intel.com>
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*/
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#include "ir.h"
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#include "ir_rvalue_visitor.h"
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class lower_noise_visitor : public ir_rvalue_visitor {
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public:
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lower_noise_visitor() : progress(false)
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{
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/* empty */
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}
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void handle_rvalue(ir_rvalue **rvalue)
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{
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if (!*rvalue)
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return;
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ir_expression *expr = (*rvalue)->as_expression();
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if (!expr)
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return;
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/* In the future, ir_unop_noise may be replaced by a call to a function
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* that implements noise. No hardware has a noise instruction.
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*/
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if (expr->operation == ir_unop_noise) {
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*rvalue = ir_constant::zero(ralloc_parent(expr), expr->type);
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this->progress = true;
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}
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}
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bool progress;
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};
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bool
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lower_noise(exec_list *instructions)
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{
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lower_noise_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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