src/compiler/glsl/lower_builtins.cpp

   1 /*
   2  * Copyright © 2019 Google, Inc.
   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 lower_builtins.cpp
  26  *
  27  * Inline calls to builtin functions.
  28  */
  29
  30 #include "ir.h"
  31 #include "ir_optimization.h"
  32
  33 namespace {
  34
  35 class lower_builtins_visitor : public ir_hierarchical_visitor {
  36 public:
  37    lower_builtins_visitor() : progress(false) { }
  38    ir_visitor_status visit_leave(ir_call *);
  39    bool progress;
  40 };
  41
  42 }
  43
  44 bool
  45 lower_builtins(exec_list *instructions)
  46 {
  47    lower_builtins_visitor v;
  48    visit_list_elements(&v, instructions);
  49    return v.progress;
  50 }
  51
  52 ir_visitor_status
  53 lower_builtins_visitor::visit_leave(ir_call *ir)
  54 {
  55    /* lower_precision() also inlines some intrinsics, which can't be inlined
  56     * further.
  57     */
  58    if (!ir->callee->is_builtin() || ir->callee->is_intrinsic())
  59       return visit_continue;
  60
  61    ir->generate_inline(ir);
  62    ir->remove();
  63
  64    this->progress = true;
  65
  66    return visit_continue;
  67 }