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Member "mesa-20.1.8/src/compiler/glsl/ir_function_can_inline.cpp" (16 Sep 2020, 2472 Bytes) of package /linux/misc/mesa-20.1.8.tar.xz:


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    1 /*
    2  * Copyright © 2010 Intel Corporation
    3  *
    4  * Permission is hereby granted, free of charge, to any person obtaining a
    5  * copy of this software and associated documentation files (the "Software"),
    6  * to deal in the Software without restriction, including without limitation
    7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
    8  * and/or sell copies of the Software, and to permit persons to whom the
    9  * Software is furnished to do so, subject to the following conditions:
   10  *
   11  * The above copyright notice and this permission notice (including the next
   12  * paragraph) shall be included in all copies or substantial portions of the
   13  * Software.
   14  *
   15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   21  * DEALINGS IN THE SOFTWARE.
   22  */
   23 
   24 /**
   25  * \file ir_function_can_inline.cpp
   26  *
   27  * Determines if we can inline a function call using ir_function_inlining.cpp.
   28  *
   29  * The primary restriction is that we can't return from the function other
   30  * than as the last instruction.  In lower_jumps.cpp, we can lower return
   31  * statements not at the end of the function to other control flow in order to
   32  * deal with this restriction.
   33  */
   34 
   35 #include "ir.h"
   36 
   37 class ir_function_can_inline_visitor : public ir_hierarchical_visitor {
   38 public:
   39    ir_function_can_inline_visitor()
   40    {
   41       this->num_returns = 0;
   42    }
   43 
   44    virtual ir_visitor_status visit_enter(ir_return *);
   45 
   46    int num_returns;
   47 };
   48 
   49 ir_visitor_status
   50 ir_function_can_inline_visitor::visit_enter(ir_return *ir)
   51 {
   52    (void) ir;
   53    this->num_returns++;
   54    return visit_continue;
   55 }
   56 
   57 bool
   58 can_inline(ir_call *call)
   59 {
   60    ir_function_can_inline_visitor v;
   61    const ir_function_signature *callee = call->callee;
   62    if (!callee->is_defined)
   63       return false;
   64 
   65    v.run((exec_list *) &callee->body);
   66 
   67    /* If the function is empty (no last instruction) or does not end with a
   68     * return statement, we need to count the implicit return.
   69     */
   70    ir_instruction *last = (ir_instruction *)callee->body.get_tail();
   71    if (last == NULL || !last->as_return())
   72       v.num_returns++;
   73 
   74    return v.num_returns == 1;
   75 }