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337d9c955b
Because these classes are used entirely from their own source files and not from separate DSOs, the linker gets to produce massively less code. This cuts about 13k of text in the libdricore case. In the non-libdricore case, the additional linkage information allows the compiler to inline some code, so libglsl.a size actually increases by about 300 bytes. For a dricore build, improves shader_runner runtime on glsl-fs-copy-propagation-texcoords-1 by 0.21% +/- 0.03% (n=353574, outliers removed). No statistically significant difference with n=322 on glslparsertest on a yofrankie shader intended to test compiler performance. Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
124 lines
3.6 KiB
C++
124 lines
3.6 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 opt_redundant_jumps.cpp
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* Remove certain types of redundant jumps
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*/
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#include "ir.h"
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namespace {
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class redundant_jumps_visitor : public ir_hierarchical_visitor {
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public:
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redundant_jumps_visitor()
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{
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this->progress = false;
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}
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virtual ir_visitor_status visit_leave(ir_if *);
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virtual ir_visitor_status visit_leave(ir_loop *);
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virtual ir_visitor_status visit_enter(ir_assignment *);
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bool progress;
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};
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} /* unnamed namespace */
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/* We only care about the top level instructions, so don't descend
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* into expressions.
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*/
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ir_visitor_status
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redundant_jumps_visitor::visit_enter(ir_assignment *ir)
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{
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return visit_continue_with_parent;
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}
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ir_visitor_status
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redundant_jumps_visitor::visit_leave(ir_if *ir)
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{
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/* If the last instruction in both branches is a 'break' or a 'continue',
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* pull it out of the branches and insert it after the if-statment. Note
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* that both must be the same type (either 'break' or 'continue').
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*/
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ir_instruction *const last_then =
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(ir_instruction *) ir->then_instructions.get_tail();
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ir_instruction *const last_else =
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(ir_instruction *) ir->else_instructions.get_tail();
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if ((last_then == NULL) || (last_else == NULL))
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return visit_continue;
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if ((last_then->ir_type != ir_type_loop_jump)
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|| (last_else->ir_type != ir_type_loop_jump))
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return visit_continue;
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ir_loop_jump *const then_jump = (ir_loop_jump *) last_then;
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ir_loop_jump *const else_jump = (ir_loop_jump *) last_else;
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if (then_jump->mode != else_jump->mode)
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return visit_continue;
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then_jump->remove();
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else_jump->remove();
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this->progress = true;
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ir->insert_after(then_jump);
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/* If both branchs of the if-statement are now empty, remove the
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* if-statement.
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*/
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if (ir->then_instructions.is_empty() && ir->else_instructions.is_empty())
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ir->remove();
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return visit_continue;
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}
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ir_visitor_status
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redundant_jumps_visitor::visit_leave(ir_loop *ir)
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{
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/* If the last instruction of a loop body is a 'continue', remove it.
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*/
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ir_instruction *const last =
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(ir_instruction *) ir->body_instructions.get_tail();
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if (last && (last->ir_type == ir_type_loop_jump)
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&& (((ir_loop_jump *) last)->mode == ir_loop_jump::jump_continue)) {
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last->remove();
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this->progress = true;
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}
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return visit_continue;
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}
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bool
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optimize_redundant_jumps(exec_list *instructions)
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{
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redundant_jumps_visitor v;
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v.run(instructions);
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return v.progress;
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}
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