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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 opt_noop_swizzle.cpp
  26.  *
  27.  * If a swizzle doesn't change the order or count of components, then
  28.  * remove the swizzle so that other optimization passes see the value
  29.  * behind it.
  30.  */
  31.  
  32. #include "ir.h"
  33. #include "ir_visitor.h"
  34. #include "ir_rvalue_visitor.h"
  35. #include "glsl_types.h"
  36.  
  37. namespace {
  38.  
  39. class ir_noop_swizzle_visitor : public ir_rvalue_visitor {
  40. public:
  41.    ir_noop_swizzle_visitor()
  42.    {
  43.       this->progress = false;
  44.    }
  45.  
  46.    void handle_rvalue(ir_rvalue **rvalue);
  47.    bool progress;
  48. };
  49.  
  50. } /* unnamed namespace */
  51.  
  52. void
  53. ir_noop_swizzle_visitor::handle_rvalue(ir_rvalue **rvalue)
  54. {
  55.    if (!*rvalue)
  56.       return;
  57.  
  58.    ir_swizzle *swiz = (*rvalue)->as_swizzle();
  59.    if (!swiz || swiz->type != swiz->val->type)
  60.       return;
  61.  
  62.    int elems = swiz->val->type->vector_elements;
  63.    if (swiz->mask.x != 0)
  64.       return;
  65.    if (elems >= 2 && swiz->mask.y != 1)
  66.       return;
  67.    if (elems >= 3 && swiz->mask.z != 2)
  68.       return;
  69.    if (elems >= 4 && swiz->mask.w != 3)
  70.       return;
  71.  
  72.    this->progress = true;
  73.    *rvalue = swiz->val;
  74. }
  75.  
  76. bool
  77. do_noop_swizzle(exec_list *instructions)
  78. {
  79.    ir_noop_swizzle_visitor v;
  80.    visit_list_elements(&v, instructions);
  81.  
  82.    return v.progress;
  83. }
  84.