2017-06-16 21:37:31 +00:00
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// Copyright (c) 2017 The Khronos Group Inc.
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// Copyright (c) 2017 Valve Corporation
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// Copyright (c) 2017 LunarG Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "local_ssa_elim_pass.h"
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#include "cfa.h"
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2017-11-08 17:40:02 +00:00
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#include "iterator.h"
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2017-06-16 21:37:31 +00:00
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namespace spvtools {
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namespace opt {
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2017-10-25 17:26:25 +00:00
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bool LocalMultiStoreElimPass::EliminateMultiStoreLocal(ir::Function* func) {
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// Add Phi instructions to the function.
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2017-11-08 17:40:02 +00:00
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if (InsertPhiInstructions(func) == Status::SuccessWithoutChange) return false;
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2017-09-20 15:07:55 +00:00
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2017-06-16 21:37:31 +00:00
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// Remove all target variable stores.
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2017-10-25 17:26:25 +00:00
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bool modified = false;
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2017-06-16 21:37:31 +00:00
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for (auto bi = func->begin(); bi != func->end(); ++bi) {
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for (auto ii = bi->begin(); ii != bi->end(); ++ii) {
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2017-11-08 17:40:02 +00:00
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if (ii->opcode() != SpvOpStore) continue;
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2017-06-16 21:37:31 +00:00
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uint32_t varId;
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(void)GetPtr(&*ii, &varId);
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if (!IsTargetVar(varId)) continue;
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2017-06-16 21:37:31 +00:00
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assert(!HasLoads(varId));
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DCEInst(&*ii);
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modified = true;
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}
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}
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2017-10-25 17:26:25 +00:00
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2017-06-16 21:37:31 +00:00
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return modified;
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}
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2017-10-30 15:13:24 +00:00
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void LocalMultiStoreElimPass::Initialize(ir::IRContext* c) {
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InitializeProcessing(c);
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2017-07-19 00:57:26 +00:00
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// Initialize extension whitelist
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InitExtensions();
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2017-06-16 21:37:31 +00:00
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};
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bool LocalMultiStoreElimPass::AllExtensionsSupported() const {
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2017-07-19 00:57:26 +00:00
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// If any extension not in whitelist, return false
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2017-10-25 17:26:25 +00:00
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for (auto& ei : get_module()->extensions()) {
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2017-11-08 17:40:02 +00:00
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const char* extName =
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reinterpret_cast<const char*>(&ei.GetInOperand(0).words[0]);
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2017-07-19 00:57:26 +00:00
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if (extensions_whitelist_.find(extName) == extensions_whitelist_.end())
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return false;
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2017-06-16 21:37:31 +00:00
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}
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return true;
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}
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Pass::Status LocalMultiStoreElimPass::ProcessImpl() {
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// Assumes all control flow structured.
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// TODO(greg-lunarg): Do SSA rewrite for non-structured control flow
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2017-10-25 17:26:25 +00:00
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if (!get_module()->HasCapability(SpvCapabilityShader))
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2017-06-16 21:37:31 +00:00
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return Status::SuccessWithoutChange;
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// Assumes logical addressing only
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// TODO(greg-lunarg): Add support for physical addressing
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2017-10-25 17:26:25 +00:00
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if (get_module()->HasCapability(SpvCapabilityAddresses))
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2017-06-16 21:37:31 +00:00
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return Status::SuccessWithoutChange;
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// Do not process if module contains OpGroupDecorate. Additional
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// support required in KillNamesAndDecorates().
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// TODO(greg-lunarg): Add support for OpGroupDecorate
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2017-11-08 17:40:02 +00:00
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for (auto& ai : get_module()->annotations())
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if (ai.opcode() == SpvOpGroupDecorate) return Status::SuccessWithoutChange;
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2017-06-16 21:37:31 +00:00
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// Do not process if any disallowed extensions are enabled
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2017-11-08 17:40:02 +00:00
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if (!AllExtensionsSupported()) return Status::SuccessWithoutChange;
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2017-06-16 21:37:31 +00:00
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// Process functions
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2017-08-10 22:42:16 +00:00
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ProcessFunction pfn = [this](ir::Function* fp) {
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return EliminateMultiStoreLocal(fp);
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};
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2017-10-25 17:26:25 +00:00
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bool modified = ProcessEntryPointCallTree(pfn, get_module());
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2017-06-16 21:37:31 +00:00
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return modified ? Status::SuccessWithChange : Status::SuccessWithoutChange;
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}
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2017-10-25 17:26:25 +00:00
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LocalMultiStoreElimPass::LocalMultiStoreElimPass() {}
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2017-06-16 21:37:31 +00:00
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2017-10-30 15:13:24 +00:00
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Pass::Status LocalMultiStoreElimPass::Process(ir::IRContext* c) {
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Initialize(c);
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2017-06-16 21:37:31 +00:00
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return ProcessImpl();
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}
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2017-07-19 00:57:26 +00:00
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void LocalMultiStoreElimPass::InitExtensions() {
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extensions_whitelist_.clear();
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extensions_whitelist_.insert({
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2017-11-08 17:40:02 +00:00
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"SPV_AMD_shader_explicit_vertex_parameter",
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"SPV_AMD_shader_trinary_minmax", "SPV_AMD_gcn_shader",
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"SPV_KHR_shader_ballot", "SPV_AMD_shader_ballot",
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"SPV_AMD_gpu_shader_half_float", "SPV_KHR_shader_draw_parameters",
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"SPV_KHR_subgroup_vote", "SPV_KHR_16bit_storage", "SPV_KHR_device_group",
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"SPV_KHR_multiview", "SPV_NVX_multiview_per_view_attributes",
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"SPV_NV_viewport_array2", "SPV_NV_stereo_view_rendering",
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"SPV_NV_sample_mask_override_coverage",
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"SPV_NV_geometry_shader_passthrough", "SPV_AMD_texture_gather_bias_lod",
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"SPV_KHR_storage_buffer_storage_class",
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// SPV_KHR_variable_pointers
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// Currently do not support extended pointer expressions
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"SPV_AMD_gpu_shader_int16", "SPV_KHR_post_depth_coverage",
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"SPV_KHR_shader_atomic_counter_ops",
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2017-07-19 00:57:26 +00:00
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});
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}
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2017-06-16 21:37:31 +00:00
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} // namespace opt
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} // namespace spvtools
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