mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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214 lines
8.1 KiB
C++
214 lines
8.1 KiB
C++
// 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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#ifndef LIBSPIRV_OPT_INLINE_PASS_H_
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#define LIBSPIRV_OPT_INLINE_PASS_H_
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#include <algorithm>
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#include <memory>
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#include <unordered_map>
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#include <vector>
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#include <list>
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#include "def_use_manager.h"
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#include "module.h"
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#include "pass.h"
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namespace spvtools {
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namespace opt {
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// See optimizer.hpp for documentation.
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class InlinePass : public Pass {
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using cbb_ptr = const ir::BasicBlock*;
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public:
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using GetBlocksFunction =
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std::function<std::vector<ir::BasicBlock*>*(const ir::BasicBlock*)>;
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InlinePass();
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Status Process(ir::Module*) override;
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const char* name() const override { return "inline"; }
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private:
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// Return the next available Id and increment it.
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inline uint32_t TakeNextId() { return next_id_++; }
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// Write the next available Id back to the module.
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inline void FinalizeNextId(ir::Module* module) {
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module->SetIdBound(next_id_);
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}
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// Find pointer to type and storage in module, return its resultId,
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// 0 if not found. TODO(greg-lunarg): Move this into type manager.
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uint32_t FindPointerToType(uint32_t type_id, SpvStorageClass storage_class);
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// Add pointer to type to module and return resultId.
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uint32_t AddPointerToType(uint32_t type_id, SpvStorageClass storage_class);
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// Add unconditional branch to labelId to end of block block_ptr.
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void AddBranch(uint32_t labelId, std::unique_ptr<ir::BasicBlock>* block_ptr);
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// Add conditional branch to end of block |block_ptr|.
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void AddBranchCond(uint32_t cond_id, uint32_t true_id,
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uint32_t false_id, std::unique_ptr<ir::BasicBlock>* block_ptr);
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// Add unconditional branch to labelId to end of block block_ptr.
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void AddLoopMerge(uint32_t merge_id, uint32_t continue_id,
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std::unique_ptr<ir::BasicBlock>* block_ptr);
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// Add store of valId to ptrId to end of block block_ptr.
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void AddStore(uint32_t ptrId, uint32_t valId,
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std::unique_ptr<ir::BasicBlock>* block_ptr);
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// Add load of ptrId into resultId to end of block block_ptr.
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void AddLoad(uint32_t typeId, uint32_t resultId, uint32_t ptrId,
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std::unique_ptr<ir::BasicBlock>* block_ptr);
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// Return new label.
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std::unique_ptr<ir::Instruction> NewLabel(uint32_t label_id);
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// Returns the id for the boolean false value. Looks in the module first
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// and creates it if not found. Remembers it for future calls.
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uint32_t GetFalseId();
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// Map callee params to caller args
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void MapParams(ir::Function* calleeFn,
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ir::UptrVectorIterator<ir::Instruction> call_inst_itr,
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std::unordered_map<uint32_t, uint32_t>* callee2caller);
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// Clone and map callee locals
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void CloneAndMapLocals(
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ir::Function* calleeFn,
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std::vector<std::unique_ptr<ir::Instruction>>* new_vars,
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std::unordered_map<uint32_t, uint32_t>* callee2caller);
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// Create return variable for callee clone code if needed. Return id
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// if created, otherwise 0.
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uint32_t CreateReturnVar(
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ir::Function* calleeFn,
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std::vector<std::unique_ptr<ir::Instruction>>* new_vars);
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// Return true if instruction must be in the same block that its result
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// is used.
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bool IsSameBlockOp(const ir::Instruction* inst) const;
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// Clone operands which must be in same block as consumer instructions.
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// Look in preCallSB for instructions that need cloning. Look in
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// postCallSB for instructions already cloned. Add cloned instruction
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// to postCallSB.
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void CloneSameBlockOps(
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std::unique_ptr<ir::Instruction>* inst,
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std::unordered_map<uint32_t, uint32_t>* postCallSB,
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std::unordered_map<uint32_t, ir::Instruction*>* preCallSB,
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std::unique_ptr<ir::BasicBlock>* block_ptr);
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// Return in new_blocks the result of inlining the call at call_inst_itr
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// within its block at call_block_itr. The block at call_block_itr can
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// just be replaced with the blocks in new_blocks. Any additional branches
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// are avoided. Debug instructions are cloned along with their callee
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// instructions. Early returns are replaced by a store to a local return
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// variable and a branch to a (created) exit block where the local variable
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// is returned. Formal parameters are trivially mapped to their actual
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// parameters. Note that the first block in new_blocks retains the label
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// of the original calling block. Also note that if an exit block is
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// created, it is the last block of new_blocks.
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//
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// Also return in new_vars additional OpVariable instructions required by
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// and to be inserted into the caller function after the block at
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// call_block_itr is replaced with new_blocks.
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void GenInlineCode(std::vector<std::unique_ptr<ir::BasicBlock>>* new_blocks,
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std::vector<std::unique_ptr<ir::Instruction>>* new_vars,
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ir::UptrVectorIterator<ir::Instruction> call_inst_itr,
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ir::UptrVectorIterator<ir::BasicBlock> call_block_itr);
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// Return true if |inst| is a function call that can be inlined.
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bool IsInlinableFunctionCall(const ir::Instruction* inst);
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// Returns the id of the merge block declared by a merge instruction in
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// this block, if any. If none, returns zero.
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uint32_t MergeBlockIdIfAny(const ir::BasicBlock& blk);
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// Compute structured successors for function |func|.
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// A block's structured successors are the blocks it branches to
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// together with its declared merge block if it has one.
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// When order matters, the merge block always appears first.
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// This assures correct depth first search in the presence of early
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// returns and kills. If the successor vector contain duplicates
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// if the merge block, they are safely ignored by DFS.
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void ComputeStructuredSuccessors(ir::Function* func);
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// Return function to return ordered structure successors for a given block
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// Assumes ComputeStructuredSuccessors() has been called.
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GetBlocksFunction StructuredSuccessorsFunction();
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// Return true if |func| has multiple returns
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bool HasMultipleReturns(ir::Function* func);
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// Return true if |func| has no return in a loop. The current analysis
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// requires structured control flow, so return false if control flow not
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// structured ie. module is not a shader.
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bool HasNoReturnInLoop(ir::Function* func);
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// Find all functions with multiple returns and no returns in loops
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void AnalyzeReturns(ir::Function* func);
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// Return true if |func| is a function that can be inlined.
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bool IsInlinableFunction(ir::Function* func);
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// Exhaustively inline all function calls in func as well as in
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// all code that is inlined into func. Return true if func is modified.
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bool Inline(ir::Function* func);
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void Initialize(ir::Module* module);
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Pass::Status ProcessImpl();
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ir::Module* module_;
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std::unique_ptr<analysis::DefUseManager> def_use_mgr_;
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// Map from function's result id to function.
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std::unordered_map<uint32_t, ir::Function*> id2function_;
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// Map from block's label id to block.
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std::unordered_map<uint32_t, ir::BasicBlock*> id2block_;
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// Set of ids of functions with early returns
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std::set<uint32_t> early_return_;
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// Set of ids of functions with no returns in loop
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std::set<uint32_t> no_return_in_loop_;
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// Set of ids of inlinable functions
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std::set<uint32_t> inlinable_;
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// Map from block to its structured successor blocks. See
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// ComputeStructuredSuccessors() for definition.
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std::unordered_map<const ir::BasicBlock*, std::vector<ir::BasicBlock*>>
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block2structured_succs_;
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// result id for OpConstantFalse
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uint32_t false_id_;
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// Next unused ID
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uint32_t next_id_;
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};
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} // namespace opt
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} // namespace spvtools
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#endif // LIBSPIRV_OPT_INLINE_PASS_H_
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