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Member "mesa-20.1.8/src/compiler/glsl/ir_expression_flattening.cpp" (16 Sep 2020, 2704 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_expression_flattening.cpp
   26  *
   27  * Takes the leaves of expression trees and makes them dereferences of
   28  * assignments of the leaves to temporaries, according to a predicate.
   29  *
   30  * This is used for breaking down matrix operations, where it's easier to
   31  * create a temporary and work on each of its vector components individually.
   32  */
   33 
   34 #include "ir.h"
   35 #include "ir_rvalue_visitor.h"
   36 #include "ir_expression_flattening.h"
   37 
   38 class ir_expression_flattening_visitor : public ir_rvalue_visitor {
   39 public:
   40    ir_expression_flattening_visitor(bool (*predicate)(ir_instruction *ir))
   41    {
   42       this->predicate = predicate;
   43    }
   44 
   45    virtual ~ir_expression_flattening_visitor()
   46    {
   47       /* empty */
   48    }
   49 
   50    void handle_rvalue(ir_rvalue **rvalue);
   51    bool (*predicate)(ir_instruction *ir);
   52 };
   53 
   54 void
   55 do_expression_flattening(exec_list *instructions,
   56              bool (*predicate)(ir_instruction *ir))
   57 {
   58    ir_expression_flattening_visitor v(predicate);
   59 
   60    foreach_in_list(ir_instruction, ir, instructions) {
   61       ir->accept(&v);
   62    }
   63 }
   64 
   65 void
   66 ir_expression_flattening_visitor::handle_rvalue(ir_rvalue **rvalue)
   67 {
   68    ir_variable *var;
   69    ir_assignment *assign;
   70    ir_rvalue *ir = *rvalue;
   71 
   72    if (!ir || !this->predicate(ir))
   73       return;
   74 
   75    void *ctx = ralloc_parent(ir);
   76 
   77    var = new(ctx) ir_variable(ir->type, "flattening_tmp", ir_var_temporary);
   78    base_ir->insert_before(var);
   79 
   80    assign = new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var), ir);
   81    base_ir->insert_before(assign);
   82 
   83    *rvalue = new(ctx) ir_dereference_variable(var);
   84 }