mirror of https://gitlab.freedesktop.org/mesa/mesa
159 lines
4.4 KiB
C++
159 lines
4.4 KiB
C++
/*
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* Copyright © 2010 Intel Corporation
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*
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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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*
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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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* Software.
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*
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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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*/
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/**
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* \file ir_vec_index_to_swizzle.cpp
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*
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* Turns constant indexing into vector types to swizzles. This will
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* let other swizzle-aware optimization passes catch these constructs,
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* and codegen backends not have to worry about this case.
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*/
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#include <stdio.h>
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#include "ir.h"
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#include "ir_visitor.h"
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#include "ir_optimization.h"
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#include "ir_print_visitor.h"
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#include "glsl_types.h"
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/**
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* Visitor class for replacing expressions with ir_constant values.
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*/
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class ir_vec_index_to_swizzle_visitor : public ir_hierarchical_visitor {
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public:
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ir_vec_index_to_swizzle_visitor()
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{
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progress = false;
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}
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ir_rvalue *convert_vec_index_to_swizzle(ir_rvalue *val);
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virtual ir_visitor_status visit_enter(ir_expression *);
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virtual ir_visitor_status visit_enter(ir_swizzle *);
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virtual ir_visitor_status visit_enter(ir_assignment *);
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virtual ir_visitor_status visit_enter(ir_return *);
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virtual ir_visitor_status visit_enter(ir_call *);
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virtual ir_visitor_status visit_enter(ir_if *);
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bool progress;
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};
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ir_rvalue *
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ir_vec_index_to_swizzle_visitor::convert_vec_index_to_swizzle(ir_rvalue *ir)
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{
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ir_dereference_array *deref = ir->as_dereference_array();
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ir_constant *ir_constant;
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if (!deref)
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return ir;
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if (deref->array->type->is_matrix() || deref->array->type->is_array())
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return ir;
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assert(deref->array_index->type->base_type == GLSL_TYPE_INT);
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ir_constant = deref->array_index->constant_expression_value();
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if (!ir_constant)
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return ir;
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this->progress = true;
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return new ir_swizzle(deref->array, ir_constant->value.i[0], 0, 0, 0, 1);
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}
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ir_visitor_status
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ir_vec_index_to_swizzle_visitor::visit_enter(ir_expression *ir)
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{
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unsigned int i;
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for (i = 0; i < ir->get_num_operands(); i++) {
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ir->operands[i] = convert_vec_index_to_swizzle(ir->operands[i]);
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}
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return visit_continue;
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}
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ir_visitor_status
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ir_vec_index_to_swizzle_visitor::visit_enter(ir_swizzle *ir)
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{
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/* Can't be hit from normal GLSL, since you can't swizzle a scalar (which
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* the result of indexing a vector is. But maybe at some point we'll end up
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* using swizzling of scalars for vector construction.
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*/
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ir->val = convert_vec_index_to_swizzle(ir->val);
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return visit_continue;
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}
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ir_visitor_status
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ir_vec_index_to_swizzle_visitor::visit_enter(ir_assignment *ir)
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{
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ir->lhs = convert_vec_index_to_swizzle(ir->lhs);
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ir->rhs = convert_vec_index_to_swizzle(ir->rhs);
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return visit_continue;
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}
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ir_visitor_status
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ir_vec_index_to_swizzle_visitor::visit_enter(ir_call *ir)
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{
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foreach_iter(exec_list_iterator, iter, *ir) {
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ir_rvalue *param = (ir_rvalue *)iter.get();
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ir_rvalue *new_param = convert_vec_index_to_swizzle(param);
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if (new_param != param) {
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param->insert_before(new_param);
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param->remove();
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}
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}
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return visit_continue;
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}
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ir_visitor_status
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ir_vec_index_to_swizzle_visitor::visit_enter(ir_return *ir)
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{
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if (ir->value) {
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ir->value = convert_vec_index_to_swizzle(ir->value);
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}
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return visit_continue;
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}
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ir_visitor_status
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ir_vec_index_to_swizzle_visitor::visit_enter(ir_if *ir)
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{
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ir->condition = convert_vec_index_to_swizzle(ir->condition);
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return visit_continue;
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}
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bool
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do_vec_index_to_swizzle(exec_list *instructions)
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{
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ir_vec_index_to_swizzle_visitor v;
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v.run(instructions);
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return false;
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}
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