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4358 | Serge | 1 | /* |
2 | * Copyright © 2010 Intel Corporation |
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3 | * |
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4 | * Permission is hereby granted, free of charge, to any person obtaining a |
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5 | * copy of this software and associated documentation files (the "Software"), |
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6 | * to deal in the Software without restriction, including without limitation |
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7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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8 | * and/or sell copies of the Software, and to permit persons to whom the |
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9 | * Software is furnished to do so, subject to the following conditions: |
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10 | * |
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11 | * The above copyright notice and this permission notice (including the next |
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12 | * paragraph) shall be included in all copies or substantial portions of the |
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13 | * Software. |
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14 | * |
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15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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21 | * DEALINGS IN THE SOFTWARE. |
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22 | */ |
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23 | |||
24 | /** |
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25 | * \file lower_vec_index_to_cond_assign.cpp |
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26 | * |
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27 | * Turns indexing into vector types to a series of conditional moves |
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28 | * of each channel's swizzle into a temporary. |
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29 | * |
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30 | * Most GPUs don't have a native way to do this operation, and this |
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31 | * works around that. For drivers using both this pass and |
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32 | * ir_vec_index_to_swizzle, there's a risk that this pass will happen |
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33 | * before sufficient constant folding to find that the array index is |
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34 | * constant. However, we hope that other optimization passes, |
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35 | * particularly constant folding of assignment conditions and copy |
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36 | * propagation, will result in the same code in the end. |
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37 | */ |
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38 | |||
39 | #include "ir.h" |
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40 | #include "ir_visitor.h" |
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41 | #include "ir_optimization.h" |
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42 | #include "glsl_types.h" |
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43 | |||
44 | /** |
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45 | * Visitor class for replacing expressions with ir_constant values. |
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46 | */ |
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47 | |||
48 | class ir_vec_index_to_cond_assign_visitor : public ir_hierarchical_visitor { |
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49 | public: |
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50 | ir_vec_index_to_cond_assign_visitor() |
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51 | { |
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52 | progress = false; |
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53 | } |
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54 | |||
55 | ir_rvalue *convert_vec_index_to_cond_assign(void *mem_ctx, |
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56 | ir_rvalue *orig_vector, |
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57 | ir_rvalue *orig_index, |
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58 | const glsl_type *type); |
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59 | |||
60 | ir_rvalue *convert_vector_extract_to_cond_assign(ir_rvalue *ir); |
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61 | |||
62 | virtual ir_visitor_status visit_enter(ir_expression *); |
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63 | virtual ir_visitor_status visit_enter(ir_swizzle *); |
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64 | virtual ir_visitor_status visit_leave(ir_assignment *); |
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65 | virtual ir_visitor_status visit_enter(ir_return *); |
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66 | virtual ir_visitor_status visit_enter(ir_call *); |
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67 | virtual ir_visitor_status visit_enter(ir_if *); |
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68 | |||
69 | bool progress; |
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70 | }; |
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71 | |||
72 | ir_rvalue * |
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73 | ir_vec_index_to_cond_assign_visitor::convert_vec_index_to_cond_assign(void *mem_ctx, |
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74 | ir_rvalue *orig_vector, |
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75 | ir_rvalue *orig_index, |
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76 | const glsl_type *type) |
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77 | { |
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78 | ir_assignment *assign, *value_assign; |
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79 | ir_variable *index, *var, *value; |
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80 | ir_dereference *deref, *deref_value; |
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81 | unsigned i; |
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82 | |||
83 | |||
84 | exec_list list; |
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85 | |||
86 | /* Store the index to a temporary to avoid reusing its tree. */ |
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87 | index = new(base_ir) ir_variable(glsl_type::int_type, |
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88 | "vec_index_tmp_i", |
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89 | ir_var_temporary); |
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90 | list.push_tail(index); |
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91 | deref = new(base_ir) ir_dereference_variable(index); |
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92 | assign = new(base_ir) ir_assignment(deref, orig_index, NULL); |
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93 | list.push_tail(assign); |
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94 | |||
95 | /* Store the value inside a temp, thus avoiding matrixes duplication */ |
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96 | value = new(base_ir) ir_variable(orig_vector->type, "vec_value_tmp", |
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97 | ir_var_temporary); |
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98 | list.push_tail(value); |
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99 | deref_value = new(base_ir) ir_dereference_variable(value); |
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100 | value_assign = new(base_ir) ir_assignment(deref_value, orig_vector); |
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101 | list.push_tail(value_assign); |
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102 | |||
103 | /* Temporary where we store whichever value we swizzle out. */ |
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104 | var = new(base_ir) ir_variable(type, "vec_index_tmp_v", |
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105 | ir_var_temporary); |
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106 | list.push_tail(var); |
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107 | |||
108 | /* Generate a single comparison condition "mask" for all of the components |
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109 | * in the vector. |
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110 | */ |
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111 | ir_rvalue *const cond_deref = |
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112 | compare_index_block(&list, index, 0, |
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113 | orig_vector->type->vector_elements, |
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114 | mem_ctx); |
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115 | |||
116 | /* Generate a conditional move of each vector element to the temp. */ |
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117 | for (i = 0; i < orig_vector->type->vector_elements; i++) { |
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118 | ir_rvalue *condition_swizzle = |
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119 | new(base_ir) ir_swizzle(cond_deref->clone(mem_ctx, NULL), |
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120 | i, 0, 0, 0, 1); |
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121 | |||
122 | /* Just clone the rest of the deref chain when trying to get at the |
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123 | * underlying variable. |
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124 | */ |
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125 | ir_rvalue *swizzle = |
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126 | new(base_ir) ir_swizzle(deref_value->clone(mem_ctx, NULL), |
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127 | i, 0, 0, 0, 1); |
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128 | |||
129 | deref = new(base_ir) ir_dereference_variable(var); |
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130 | assign = new(base_ir) ir_assignment(deref, swizzle, condition_swizzle); |
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131 | list.push_tail(assign); |
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132 | } |
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133 | |||
134 | /* Put all of the new instructions in the IR stream before the old |
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135 | * instruction. |
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136 | */ |
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137 | base_ir->insert_before(&list); |
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138 | |||
139 | this->progress = true; |
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140 | return new(base_ir) ir_dereference_variable(var); |
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141 | } |
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142 | |||
143 | ir_rvalue * |
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144 | ir_vec_index_to_cond_assign_visitor::convert_vector_extract_to_cond_assign(ir_rvalue *ir) |
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145 | { |
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146 | ir_expression *const expr = ir->as_expression(); |
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147 | |||
148 | if (expr == NULL || expr->operation != ir_binop_vector_extract) |
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149 | return ir; |
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150 | |||
151 | return convert_vec_index_to_cond_assign(ralloc_parent(ir), |
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152 | expr->operands[0], |
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153 | expr->operands[1], |
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154 | ir->type); |
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155 | } |
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156 | |||
157 | ir_visitor_status |
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158 | ir_vec_index_to_cond_assign_visitor::visit_enter(ir_expression *ir) |
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159 | { |
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160 | unsigned int i; |
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161 | |||
162 | for (i = 0; i < ir->get_num_operands(); i++) { |
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163 | ir->operands[i] = convert_vector_extract_to_cond_assign(ir->operands[i]); |
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164 | } |
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165 | |||
166 | return visit_continue; |
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167 | } |
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168 | |||
169 | ir_visitor_status |
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170 | ir_vec_index_to_cond_assign_visitor::visit_enter(ir_swizzle *ir) |
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171 | { |
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172 | /* Can't be hit from normal GLSL, since you can't swizzle a scalar (which |
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173 | * the result of indexing a vector is. But maybe at some point we'll end up |
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174 | * using swizzling of scalars for vector construction. |
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175 | */ |
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176 | ir->val = convert_vector_extract_to_cond_assign(ir->val); |
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177 | |||
178 | return visit_continue; |
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179 | } |
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180 | |||
181 | ir_visitor_status |
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182 | ir_vec_index_to_cond_assign_visitor::visit_leave(ir_assignment *ir) |
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183 | { |
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184 | ir->rhs = convert_vector_extract_to_cond_assign(ir->rhs); |
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185 | |||
186 | if (ir->condition) { |
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187 | ir->condition = convert_vector_extract_to_cond_assign(ir->condition); |
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188 | } |
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189 | |||
190 | return visit_continue; |
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191 | } |
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192 | |||
193 | ir_visitor_status |
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194 | ir_vec_index_to_cond_assign_visitor::visit_enter(ir_call *ir) |
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195 | { |
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196 | foreach_iter(exec_list_iterator, iter, *ir) { |
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197 | ir_rvalue *param = (ir_rvalue *)iter.get(); |
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198 | ir_rvalue *new_param = convert_vector_extract_to_cond_assign(param); |
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199 | |||
200 | if (new_param != param) { |
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201 | param->replace_with(new_param); |
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202 | } |
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203 | } |
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204 | |||
205 | return visit_continue; |
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206 | } |
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207 | |||
208 | ir_visitor_status |
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209 | ir_vec_index_to_cond_assign_visitor::visit_enter(ir_return *ir) |
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210 | { |
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211 | if (ir->value) { |
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212 | ir->value = convert_vector_extract_to_cond_assign(ir->value); |
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213 | } |
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214 | |||
215 | return visit_continue; |
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216 | } |
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217 | |||
218 | ir_visitor_status |
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219 | ir_vec_index_to_cond_assign_visitor::visit_enter(ir_if *ir) |
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220 | { |
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221 | ir->condition = convert_vector_extract_to_cond_assign(ir->condition); |
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222 | |||
223 | return visit_continue; |
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224 | } |
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225 | |||
226 | bool |
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227 | do_vec_index_to_cond_assign(exec_list *instructions) |
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228 | { |
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229 | ir_vec_index_to_cond_assign_visitor v; |
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230 | |||
231 | visit_list_elements(&v, instructions); |
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232 | |||
233 | return v.progress; |
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234 | }>> |