30f51f1a1a
st_glsl_to_tgsi and ir_to_mesa have handled conditional discards for a long time; the previous patch added that capability to i965. i965 (Haswell) shader-db stats: Without NIR: total instructions in shared programs: 5792133 -> 5776360 (-0.27%) instructions in affected programs: 737585 -> 721812 (-2.14%) helped: 6300 HURT: 68 GAINED: 2 With NIR: total instructions in shared programs: 5787538 -> 5769569 (-0.31%) instructions in affected programs: 767843 -> 749874 (-2.34%) helped: 6522 HURT: 35 GAINED: 6 Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Connor Abbott <cwabbott0@gmail.com> Reviewed-by: Matt Turner <mattst88@gmail.com> Reviewed-by: Eric Anholt <eric@anholt.net>
82 lines
2.3 KiB
C++
82 lines
2.3 KiB
C++
/*
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* Copyright © 2014 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_conditional_discard.cpp
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*
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* Replace
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*
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* if (cond) discard;
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*
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* with
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*
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* (discard <condition>)
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*/
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#include "glsl_types.h"
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#include "ir.h"
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namespace {
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class opt_conditional_discard_visitor : public ir_hierarchical_visitor {
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public:
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opt_conditional_discard_visitor()
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{
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progress = false;
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}
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ir_visitor_status visit_leave(ir_if *);
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bool progress;
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};
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} /* anonymous namespace */
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bool
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opt_conditional_discard(exec_list *instructions)
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{
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opt_conditional_discard_visitor v;
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v.run(instructions);
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return v.progress;
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}
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ir_visitor_status
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opt_conditional_discard_visitor::visit_leave(ir_if *ir)
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{
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/* Look for "if (...) discard" with no else clause or extra statements. */
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if (ir->then_instructions.is_empty() ||
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!ir->then_instructions.head->next->is_tail_sentinel() ||
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!((ir_instruction *) ir->then_instructions.head)->as_discard() ||
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!ir->else_instructions.is_empty())
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return visit_continue;
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/* Move the condition and replace the ir_if with the ir_discard. */
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ir_discard *discard = (ir_discard *) ir->then_instructions.head;
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discard->condition = ir->condition;
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ir->replace_with(discard);
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progress = true;
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return visit_continue;
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}
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