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Diffstat (limited to 'ir_function_can_inline.cpp')
| -rw-r--r-- | ir_function_can_inline.cpp | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/ir_function_can_inline.cpp b/ir_function_can_inline.cpp new file mode 100644 index 0000000000..6c96a206a6 --- /dev/null +++ b/ir_function_can_inline.cpp @@ -0,0 +1,227 @@ +/* + * 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_function_can_inline.cpp + * + * Determines if we can inline a function call using ir_function_inlining.cpp. + * + * The primary restriction is that we can't return from the function + * other than as the last instruction. We could potentially work + * around this for some constructs by flattening control flow and + * moving the return to the end, or by using breaks from a do {} while + * (0) loop surrounding the function body. + */ + +#define NULL 0 +#include "ir.h" +#include "ir_visitor.h" +#include "ir_function_inlining.h" +#include "ir_expression_flattening.h" +#include "glsl_types.h" + +class ir_function_can_inline_visitor : public ir_visitor { +public: + ir_function_can_inline_visitor() + { + this->can_inline = true; + this->num_returns = 0; + } + + /** + * \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_label *); + virtual void visit(ir_loop *); + virtual void visit(ir_loop_jump *); + virtual void visit(ir_function_signature *); + virtual void visit(ir_function *); + virtual void visit(ir_expression *); + virtual void visit(ir_swizzle *); + virtual void visit(ir_dereference *); + 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 *); + /*@}*/ + + bool can_inline; + int num_returns; +}; + +void +ir_function_can_inline_visitor::visit(ir_variable *ir) +{ + (void)ir; +} + +void +ir_function_can_inline_visitor::visit(ir_label *ir) +{ + (void)ir; +} + +void +ir_function_can_inline_visitor::visit(ir_loop *ir) +{ + /* FINISHME: Implement loop cloning in ir_function_inlining.cpp */ + this->can_inline = false; + + if (ir->from) + ir->from->accept(this); + if (ir->to) + ir->to->accept(this); + if (ir->increment) + ir->increment->accept(this); + + foreach_iter(exec_list_iterator, iter, ir->body_instructions) { + ir_instruction *inner_ir = (ir_instruction *)iter.get(); + inner_ir->accept(this); + } +} + +void +ir_function_can_inline_visitor::visit(ir_loop_jump *ir) +{ + (void) ir; +} + + +void +ir_function_can_inline_visitor::visit(ir_function_signature *ir) +{ + (void)ir; +} + + +void +ir_function_can_inline_visitor::visit(ir_function *ir) +{ + (void) ir; +} + +void +ir_function_can_inline_visitor::visit(ir_expression *ir) +{ + unsigned int operand; + + for (operand = 0; operand < ir->get_num_operands(); operand++) { + ir->operands[operand]->accept(this); + } +} + + +void +ir_function_can_inline_visitor::visit(ir_swizzle *ir) +{ + ir->val->accept(this); +} + +void +ir_function_can_inline_visitor::visit(ir_dereference *ir) +{ + ir->var->accept(this); + if (ir->mode == ir_dereference::ir_reference_array) + ir->selector.array_index->accept(this); +} + +void +ir_function_can_inline_visitor::visit(ir_assignment *ir) +{ + ir->lhs->accept(this); + ir->rhs->accept(this); + if (ir->condition) + ir->condition->accept(this); +} + + +void +ir_function_can_inline_visitor::visit(ir_constant *ir) +{ + (void)ir; +} + + +void +ir_function_can_inline_visitor::visit(ir_call *ir) +{ + foreach_iter(exec_list_iterator, iter, *ir) { + ir_rvalue *param = (ir_rvalue *)iter.get(); + + param->accept(this); + } +} + + +void +ir_function_can_inline_visitor::visit(ir_return *ir) +{ + ir->get_value()->accept(this); + + this->num_returns++; +} + + +void +ir_function_can_inline_visitor::visit(ir_if *ir) +{ + /* FINISHME: Implement if cloning in ir_function_inlining.cpp. */ + this->can_inline = false; + + ir->condition->accept(this); + + foreach_iter(exec_list_iterator, iter, ir->then_instructions) { + ir_instruction *inner_ir = (ir_instruction *)iter.get(); + inner_ir->accept(this); + } + + foreach_iter(exec_list_iterator, iter, ir->else_instructions) { + ir_instruction *inner_ir = (ir_instruction *)iter.get(); + inner_ir->accept(this); + } +} + +bool +can_inline(ir_call *call) +{ + ir_function_can_inline_visitor v; + const ir_function_signature *callee = call->get_callee(); + + foreach_iter(exec_list_iterator, iter, callee->body) { + ir_instruction *ir = (ir_instruction *)iter.get(); + ir->accept(&v); + } + + ir_instruction *last = (ir_instruction *)callee->body.get_tail(); + if (last && !last->as_return()) + v.num_returns++; + + return v.can_inline && v.num_returns == 1; +} |