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Diffstat (limited to 'src/glsl/opt_function_inlining.cpp')
| -rw-r--r-- | src/glsl/opt_function_inlining.cpp | 424 |
1 files changed, 424 insertions, 0 deletions
diff --git a/src/glsl/opt_function_inlining.cpp b/src/glsl/opt_function_inlining.cpp new file mode 100644 index 00000000000..169fd826882 --- /dev/null +++ b/src/glsl/opt_function_inlining.cpp @@ -0,0 +1,424 @@ +/* + * 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 opt_function_inlining.cpp + * + * Replaces calls to functions with the body of the function. + */ + +#include <inttypes.h> +#include "ir.h" +#include "ir_visitor.h" +#include "ir_function_inlining.h" +#include "ir_expression_flattening.h" +#include "glsl_types.h" +#include "program/hash_table.h" + +static void +do_sampler_replacement(exec_list *instructions, + ir_variable *sampler, + ir_dereference *deref); + +class ir_function_inlining_visitor : public ir_hierarchical_visitor { +public: + ir_function_inlining_visitor() + { + progress = false; + } + + virtual ~ir_function_inlining_visitor() + { + /* empty */ + } + + virtual ir_visitor_status visit_enter(ir_expression *); + virtual ir_visitor_status visit_enter(ir_call *); + virtual ir_visitor_status visit_enter(ir_assignment *); + virtual ir_visitor_status visit_enter(ir_return *); + virtual ir_visitor_status visit_enter(ir_texture *); + virtual ir_visitor_status visit_enter(ir_swizzle *); + + bool progress; +}; + + +bool +automatic_inlining_predicate(ir_instruction *ir) +{ + ir_call *call = ir->as_call(); + + if (call && can_inline(call)) + return true; + + return false; +} + +bool +do_function_inlining(exec_list *instructions) +{ + ir_function_inlining_visitor v; + + do_expression_flattening(instructions, automatic_inlining_predicate); + + v.run(instructions); + + return v.progress; +} + +static void +replace_return_with_assignment(ir_instruction *ir, void *data) +{ + void *ctx = talloc_parent(ir); + ir_variable *retval = (ir_variable *)data; + ir_return *ret = ir->as_return(); + + if (ret) { + if (ret->value) { + ir_rvalue *lhs = new(ctx) ir_dereference_variable(retval); + ret->replace_with(new(ctx) ir_assignment(lhs, ret->value, NULL)); + } else { + /* un-valued return has to be the last return, or we shouldn't + * have reached here. (see can_inline()). + */ + assert(ret->next->is_tail_sentinel()); + ret->remove(); + } + } +} + +ir_rvalue * +ir_call::generate_inline(ir_instruction *next_ir) +{ + void *ctx = talloc_parent(this); + ir_variable **parameters; + int num_parameters; + int i; + ir_variable *retval = NULL; + struct hash_table *ht; + + ht = hash_table_ctor(0, hash_table_pointer_hash, hash_table_pointer_compare); + + num_parameters = 0; + foreach_iter(exec_list_iterator, iter_sig, this->callee->parameters) + num_parameters++; + + parameters = new ir_variable *[num_parameters]; + + /* Generate storage for the return value. */ + if (this->callee->return_type) { + retval = new(ctx) ir_variable(this->callee->return_type, "_ret_val", + ir_var_auto); + next_ir->insert_before(retval); + } + + /* Generate the declarations for the parameters to our inlined code, + * and set up the mapping of real function body variables to ours. + */ + i = 0; + exec_list_iterator sig_param_iter = this->callee->parameters.iterator(); + exec_list_iterator param_iter = this->actual_parameters.iterator(); + for (i = 0; i < num_parameters; i++) { + ir_variable *sig_param = (ir_variable *) sig_param_iter.get(); + ir_rvalue *param = (ir_rvalue *) param_iter.get(); + + /* Generate a new variable for the parameter. */ + if (sig_param->type->base_type == GLSL_TYPE_SAMPLER) { + /* For samplers, we want the inlined sampler references + * referencing the passed in sampler variable, since that + * will have the location information, which an assignment of + * a sampler wouldn't. Fix it up below. + */ + parameters[i] = NULL; + } else { + parameters[i] = sig_param->clone(ctx, ht); + parameters[i]->mode = ir_var_auto; + + /* Remove the read-only decoration becuase we're going to write + * directly to this variable. If the cloned variable is left + * read-only and the inlined function is inside a loop, the loop + * analysis code will get confused. + */ + parameters[i]->read_only = false; + next_ir->insert_before(parameters[i]); + } + + /* Move the actual param into our param variable if it's an 'in' type. */ + if (parameters[i] && (sig_param->mode == ir_var_in || + sig_param->mode == ir_var_inout)) { + ir_assignment *assign; + + assign = new(ctx) ir_assignment(new(ctx) ir_dereference_variable(parameters[i]), + param, NULL); + next_ir->insert_before(assign); + } + + sig_param_iter.next(); + param_iter.next(); + } + + exec_list new_instructions; + + /* Generate the inlined body of the function to a new list */ + foreach_iter(exec_list_iterator, iter, callee->body) { + ir_instruction *ir = (ir_instruction *)iter.get(); + ir_instruction *new_ir = ir->clone(ctx, ht); + + new_instructions.push_tail(new_ir); + visit_tree(new_ir, replace_return_with_assignment, retval); + } + + /* If any samplers were passed in, replace any deref of the sampler + * with a deref of the sampler argument. + */ + param_iter = this->actual_parameters.iterator(); + sig_param_iter = this->callee->parameters.iterator(); + for (i = 0; i < num_parameters; i++) { + ir_instruction *const param = (ir_instruction *) param_iter.get(); + ir_variable *sig_param = (ir_variable *) sig_param_iter.get(); + + if (sig_param->type->base_type == GLSL_TYPE_SAMPLER) { + ir_dereference *deref = param->as_dereference(); + + assert(deref); + do_sampler_replacement(&new_instructions, sig_param, deref); + } + param_iter.next(); + sig_param_iter.next(); + } + + /* Now push those new instructions in. */ + foreach_iter(exec_list_iterator, iter, new_instructions) { + ir_instruction *ir = (ir_instruction *)iter.get(); + next_ir->insert_before(ir); + } + + /* Copy back the value of any 'out' parameters from the function body + * variables to our own. + */ + i = 0; + param_iter = this->actual_parameters.iterator(); + sig_param_iter = this->callee->parameters.iterator(); + for (i = 0; i < num_parameters; i++) { + ir_instruction *const param = (ir_instruction *) param_iter.get(); + const ir_variable *const sig_param = (ir_variable *) sig_param_iter.get(); + + /* Move our param variable into the actual param if it's an 'out' type. */ + if (parameters[i] && (sig_param->mode == ir_var_out || + sig_param->mode == ir_var_inout)) { + ir_assignment *assign; + + assign = new(ctx) ir_assignment(param->clone(ctx, NULL)->as_rvalue(), + new(ctx) ir_dereference_variable(parameters[i]), + NULL); + next_ir->insert_before(assign); + } + + param_iter.next(); + sig_param_iter.next(); + } + + delete [] parameters; + + hash_table_dtor(ht); + + if (retval) + return new(ctx) ir_dereference_variable(retval); + else + return NULL; +} + + +ir_visitor_status +ir_function_inlining_visitor::visit_enter(ir_expression *ir) +{ + (void) ir; + return visit_continue_with_parent; +} + + +ir_visitor_status +ir_function_inlining_visitor::visit_enter(ir_return *ir) +{ + (void) ir; + return visit_continue_with_parent; +} + + +ir_visitor_status +ir_function_inlining_visitor::visit_enter(ir_texture *ir) +{ + (void) ir; + return visit_continue_with_parent; +} + + +ir_visitor_status +ir_function_inlining_visitor::visit_enter(ir_swizzle *ir) +{ + (void) ir; + return visit_continue_with_parent; +} + + +ir_visitor_status +ir_function_inlining_visitor::visit_enter(ir_call *ir) +{ + if (can_inline(ir)) { + /* If the call was part of some tree, then it should have been + * flattened out or we shouldn't have seen it because of a + * visit_continue_with_parent in this visitor. + */ + assert(ir == base_ir); + + (void) ir->generate_inline(ir); + ir->remove(); + this->progress = true; + } + + return visit_continue; +} + + +ir_visitor_status +ir_function_inlining_visitor::visit_enter(ir_assignment *ir) +{ + ir_call *call = ir->rhs->as_call(); + if (!call || !can_inline(call)) + return visit_continue; + + /* generates the parameter setup, function body, and returns the return + * value of the function + */ + ir_rvalue *rhs = call->generate_inline(ir); + assert(rhs); + + ir->rhs = rhs; + this->progress = true; + + return visit_continue; +} + +/** + * Replaces references to the "sampler" variable with a clone of "deref." + * + * From the spec, samplers can appear in the tree as function + * (non-out) parameters and as the result of array indexing and + * structure field selection. In our builtin implementation, they + * also appear in the sampler field of an ir_tex instruction. + */ + +class ir_sampler_replacement_visitor : public ir_hierarchical_visitor { +public: + ir_sampler_replacement_visitor(ir_variable *sampler, ir_dereference *deref) + { + this->sampler = sampler; + this->deref = deref; + } + + virtual ~ir_sampler_replacement_visitor() + { + } + + virtual ir_visitor_status visit_leave(ir_call *); + virtual ir_visitor_status visit_leave(ir_dereference_array *); + virtual ir_visitor_status visit_leave(ir_dereference_record *); + virtual ir_visitor_status visit_leave(ir_texture *); + + void replace_deref(ir_dereference **deref); + void replace_rvalue(ir_rvalue **rvalue); + + ir_variable *sampler; + ir_dereference *deref; +}; + +void +ir_sampler_replacement_visitor::replace_deref(ir_dereference **deref) +{ + ir_dereference_variable *deref_var = (*deref)->as_dereference_variable(); + if (deref_var && deref_var->var == this->sampler) { + *deref = this->deref->clone(talloc_parent(*deref), NULL); + } +} + +void +ir_sampler_replacement_visitor::replace_rvalue(ir_rvalue **rvalue) +{ + if (!*rvalue) + return; + + ir_dereference *deref = (*rvalue)->as_dereference(); + + if (!deref) + return; + + replace_deref(&deref); + *rvalue = deref; +} + +ir_visitor_status +ir_sampler_replacement_visitor::visit_leave(ir_texture *ir) +{ + replace_deref(&ir->sampler); + + return visit_continue; +} + +ir_visitor_status +ir_sampler_replacement_visitor::visit_leave(ir_dereference_array *ir) +{ + replace_rvalue(&ir->array); + return visit_continue; +} + +ir_visitor_status +ir_sampler_replacement_visitor::visit_leave(ir_dereference_record *ir) +{ + replace_rvalue(&ir->record); + return visit_continue; +} + +ir_visitor_status +ir_sampler_replacement_visitor::visit_leave(ir_call *ir) +{ + foreach_iter(exec_list_iterator, iter, *ir) { + ir_rvalue *param = (ir_rvalue *)iter.get(); + ir_rvalue *new_param = param; + replace_rvalue(&new_param); + + if (new_param != param) { + param->replace_with(new_param); + } + } + return visit_continue; +} + +static void +do_sampler_replacement(exec_list *instructions, + ir_variable *sampler, + ir_dereference *deref) +{ + ir_sampler_replacement_visitor v(sampler, deref); + + visit_list_elements(&v, instructions); +} |