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Diffstat (limited to 'src/glsl/ir_constant_folding.cpp')
| -rw-r--r-- | src/glsl/ir_constant_folding.cpp | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/src/glsl/ir_constant_folding.cpp b/src/glsl/ir_constant_folding.cpp new file mode 100644 index 0000000000..342d027bbe --- /dev/null +++ b/src/glsl/ir_constant_folding.cpp @@ -0,0 +1,229 @@ +/* + * Copyright © 2010 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + +/** + * \file ir_constant_folding.cpp + * Replace constant-valued expressions with references to constant values. + */ + +#include "ir.h" +#include "ir_visitor.h" +#include "ir_optimization.h" +#include "glsl_types.h" + +/** + * Visitor class for replacing expressions with ir_constant values. + */ + +class ir_constant_folding_visitor : public ir_visitor { +public: + ir_constant_folding_visitor() + { + /* empty */ + } + + virtual ~ir_constant_folding_visitor() + { + /* empty */ + } + + /** + * \name Visit methods + * + * As typical for the visitor pattern, there must be one \c visit method for + * each concrete subclass of \c ir_instruction. Virtual base classes within + * the hierarchy should not have \c visit methods. + */ + /*@{*/ + virtual void visit(ir_variable *); + virtual void visit(ir_function_signature *); + virtual void visit(ir_function *); + virtual void visit(ir_expression *); + virtual void visit(ir_texture *); + virtual void visit(ir_swizzle *); + virtual void visit(ir_dereference_variable *); + virtual void visit(ir_dereference_array *); + virtual void visit(ir_dereference_record *); + virtual void visit(ir_assignment *); + virtual void visit(ir_constant *); + virtual void visit(ir_call *); + virtual void visit(ir_return *); + virtual void visit(ir_if *); + virtual void visit(ir_loop *); + virtual void visit(ir_loop_jump *); + /*@}*/ +}; + +void +ir_constant_folding_visitor::visit(ir_variable *ir) +{ + (void) ir; +} + + +void +ir_constant_folding_visitor::visit(ir_function_signature *ir) +{ + visit_exec_list(&ir->body, this); +} + + +void +ir_constant_folding_visitor::visit(ir_function *ir) +{ + foreach_iter(exec_list_iterator, iter, *ir) { + ir_function_signature *const sig = (ir_function_signature *) iter.get(); + sig->accept(this); + } +} + +void +ir_constant_folding_visitor::visit(ir_expression *ir) +{ + ir_constant *op[2]; + unsigned int operand; + + for (operand = 0; operand < ir->get_num_operands(); operand++) { + op[operand] = ir->operands[operand]->constant_expression_value(); + if (op[operand]) { + ir->operands[operand] = op[operand]; + } else { + ir->operands[operand]->accept(this); + } + } +} + + +void +ir_constant_folding_visitor::visit(ir_texture *ir) +{ + // FINISHME: Do stuff with texture lookups + (void) ir; +} + + +void +ir_constant_folding_visitor::visit(ir_swizzle *ir) +{ + ir->val->accept(this); +} + + +void +ir_constant_folding_visitor::visit(ir_dereference_variable *ir) +{ + (void) ir; +} + + +void +ir_constant_folding_visitor::visit(ir_dereference_array *ir) +{ + ir_constant *const_val = + ir->array_index->constant_expression_value(); + + if (const_val) + ir->array_index = const_val; + else + ir->array_index->accept(this); + + ir->array->accept(this); +} + + +void +ir_constant_folding_visitor::visit(ir_dereference_record *ir) +{ + ir->record->accept(this); +} + + +void +ir_constant_folding_visitor::visit(ir_assignment *ir) +{ + ir_constant *const_val = ir->rhs->constant_expression_value(); + if (const_val) + ir->rhs = const_val; + else + ir->rhs->accept(this); +} + + +void +ir_constant_folding_visitor::visit(ir_constant *ir) +{ + (void) ir; +} + + +void +ir_constant_folding_visitor::visit(ir_call *ir) +{ + (void) ir; +} + + +void +ir_constant_folding_visitor::visit(ir_return *ir) +{ + (void) ir; +} + + +void +ir_constant_folding_visitor::visit(ir_if *ir) +{ + ir_constant *const_val = ir->condition->constant_expression_value(); + if (const_val) + ir->condition = const_val; + else + ir->condition->accept(this); + + visit_exec_list(&ir->then_instructions, this); + visit_exec_list(&ir->else_instructions, this); +} + + +void +ir_constant_folding_visitor::visit(ir_loop *ir) +{ + (void) ir; +} + + +void +ir_constant_folding_visitor::visit(ir_loop_jump *ir) +{ + (void) ir; +} + +bool +do_constant_folding(exec_list *instructions) +{ + ir_constant_folding_visitor constant_folding; + + visit_exec_list(instructions, &constant_folding); + + /* FINISHME: Return real progress. */ + return false; +} |