mirror of https://gitlab.freedesktop.org/mesa/mesa
97 lines
2.9 KiB
C++
97 lines
2.9 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_function_can_inline.cpp
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*
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* Determines if we can inline a function call using ir_function_inlining.cpp.
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*
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* The primary restriction is that we can't return from the function
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* other than as the last instruction. We could potentially work
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* around this for some constructs by flattening control flow and
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* moving the return to the end, or by using breaks from a do {} while
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* (0) loop surrounding the function body.
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*/
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#define NULL 0
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#include "ir.h"
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class ir_function_can_inline_visitor : public ir_hierarchical_visitor {
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public:
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ir_function_can_inline_visitor()
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{
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this->can_inline = true;
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this->num_returns = 0;
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}
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virtual ir_visitor_status visit_enter(ir_loop *);
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virtual ir_visitor_status visit_enter(ir_return *);
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virtual ir_visitor_status visit_enter(ir_if *);
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bool can_inline;
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int num_returns;
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};
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ir_visitor_status
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ir_function_can_inline_visitor::visit_enter(ir_loop *ir)
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{
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/* FINISHME: Implement loop cloning in ir_function_inlining.cpp */
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(void) ir;
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this->can_inline = false;
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return visit_stop;
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}
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ir_visitor_status
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ir_function_can_inline_visitor::visit_enter(ir_return *ir)
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{
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(void) ir;
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this->num_returns++;
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return visit_continue;
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}
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ir_visitor_status
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ir_function_can_inline_visitor::visit_enter(ir_if *ir)
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{
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/* FINISHME: Implement if cloning in ir_function_inlining.cpp. */
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(void) ir;
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this->can_inline = false;
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return visit_stop;
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}
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bool
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can_inline(ir_call *call)
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{
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ir_function_can_inline_visitor v;
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const ir_function_signature *callee = call->get_callee();
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v.run((exec_list *) &callee->body);
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ir_instruction *last = (ir_instruction *)callee->body.get_tail();
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if (last && !last->as_return())
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v.num_returns++;
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return v.can_inline && v.num_returns == 1;
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}
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