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* Copyright © 2013 Intel Corporation
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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#include "ir_builder.h"
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#include "ir_rvalue_visitor.h"
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#include "ir_optimization.h"
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using namespace ir_builder;
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class vector_insert_visitor : public ir_rvalue_visitor {
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vector_insert_visitor(bool lower_nonconstant_index)
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: progress(false), lower_nonconstant_index(lower_nonconstant_index),
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remove_assignment(false)
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factory.instructions = &factory_instructions;
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virtual ~vector_insert_visitor()
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assert(factory_instructions.is_empty());
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virtual void handle_rvalue(ir_rvalue **rv);
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virtual ir_visitor_status visit_leave(ir_assignment *expr);
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exec_list factory_instructions;
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bool lower_nonconstant_index;
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bool remove_assignment;
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} /* anonymous namespace */
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vector_insert_visitor::handle_rvalue(ir_rvalue **rv)
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if (*rv == NULL || (*rv)->ir_type != ir_type_expression)
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ir_expression *const expr = (ir_expression *) *rv;
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if (likely(expr->operation != ir_triop_vector_insert))
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factory.mem_ctx = ralloc_parent(expr);
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ir_constant *const idx =
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expr->operands[2]->constant_expression_value(factory.mem_ctx);
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unsigned index = idx->value.u[0];
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if (index >= expr->operands[0]->type->vector_elements) {
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/* Section 5.11 (Out-of-Bounds Accesses) of the GLSL 4.60 spec says:
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* In the subsections described above for array, vector, matrix and
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* structure accesses, any out-of-bounds access produced undefined
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* behavior.... Out-of-bounds writes may be discarded or overwrite
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* other variables of the active program.
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this->remove_assignment = true;
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this->progress = true;
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/* Replace (vector_insert (vec) (scalar) (index)) with a dereference of
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* a new temporary. The new temporary gets assigned as
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* where mask is the component selected by index.
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ir_variable *const temp =
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factory.make_temp(expr->operands[0]->type, "vec_tmp");
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const int mask = 1 << idx->value.i[0];
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factory.emit(assign(temp, expr->operands[0]));
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factory.emit(assign(temp, expr->operands[1], mask));
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this->progress = true;
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*rv = new(factory.mem_ctx) ir_dereference_variable(temp);
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} else if (this->lower_nonconstant_index) {
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/* Replace (vector_insert (vec) (scalar) (index)) with a dereference of
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* a new temporary. The new temporary gets assigned as
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ir_variable *const temp =
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factory.make_temp(expr->operands[0]->type, "vec_tmp");
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ir_variable *const src_temp =
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factory.make_temp(expr->operands[1]->type, "src_temp");
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factory.emit(assign(temp, expr->operands[0]));
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factory.emit(assign(src_temp, expr->operands[1]));
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assert(expr->operands[2]->type == glsl_type::int_type ||
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expr->operands[2]->type == glsl_type::uint_type);
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for (unsigned i = 0; i < expr->type->vector_elements; i++) {
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ir_constant *const cmp_index =
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ir_constant::zero(factory.mem_ctx, expr->operands[2]->type);
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cmp_index->value.u[0] = i;
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ir_variable *const cmp_result =
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factory.make_temp(glsl_type::bool_type, "index_condition");
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factory.emit(assign(cmp_result,
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equal(expr->operands[2]->clone(factory.mem_ctx,
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factory.emit(if_tree(cmp_result,
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assign(temp, src_temp, WRITEMASK_X << i)));
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this->progress = true;
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*rv = new(factory.mem_ctx) ir_dereference_variable(temp);
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base_ir->insert_before(factory.instructions);
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vector_insert_visitor::visit_leave(ir_assignment *ir)
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ir_rvalue_visitor::visit_leave(ir);
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if (this->remove_assignment) {
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this->remove_assignment = false;
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return visit_continue;
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lower_vector_insert(exec_list *instructions, bool lower_nonconstant_index)
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vector_insert_visitor v(lower_nonconstant_index);
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visit_list_elements(&v, instructions);