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/*========================== begin_copyright_notice ============================
Copyright (C) 2017-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#pragma once
#include "Compiler/CodeGenContextWrapper.hpp"
#include "common/LLVMWarningsPush.hpp"
#include <llvm/Pass.h>
#include "common/LLVMWarningsPop.hpp"
namespace llvm
{
class Constant;
class ConstantExpr;
class ConstantVector;
class Instruction;
class ConstantStruct;
}
namespace IGC
{
/// @brief This pass breaks constant expressions appearing
/// in instructions into instruction sequences.
class BreakConstantExpr : public llvm::FunctionPass
{
public:
// Pass identification, replacement for typeid
static char ID;
/// @brief Constructor
BreakConstantExpr();
/// @brief Destructor
~BreakConstantExpr() {}
/// @brief Provides name of pass
virtual llvm::StringRef getPassName() const override
{
return "BreakConstantExprPass";
}
/// @brief Main entry point.
/// @param F The destination function.
virtual bool runOnFunction(llvm::Function& F) override;
virtual void getAnalysisUsage(llvm::AnalysisUsage& AU) const override
{
AU.setPreservesCFG();
}
protected:
/// @brief Recursively break up a constant expression by creating instructions
/// for each sub-expression.
/// The newly created instructions are placed before the user, and
/// replace the constantexprs.
/// @param expr The expression to break up.
/// @param user The original user of the expression.
void breakExpressions(llvm::ConstantExpr* expr, int operandIndex, llvm::Instruction* user);
/// @brief Break up constant expressions in a ConstantVector elements by creating instructions
/// for each sub-expression.
/// The newly created instructions are placed before the user, and replace all constant
/// expressions and the constant vector.
/// @param cvec Constant vector with expressions to break up.
/// @param operandIndex Index of the constant vector operand in the parent instruction
/// @param user The original user of the expression.
bool breakExpressionsInVector(llvm::ConstantVector* cvec, int operandIndex, llvm::Instruction* user);
/// @brief Break up constant structure by creating a non constant
/// structure and replacing all its constant operands by instructions.
/// @param cs Constant structure to break up
/// @param operandIndex Index of the constant vector operand in the parent instruction
/// @param user The original user of the expression.
void breakConstantStruct(llvm::ConstantStruct* cs, int operandIndex, llvm::Instruction* user);
/// @brief Replaces input constant expression or constant vector with a new instruction.
/// @param exprOrVec Constant vector or expressions to replace.
/// @param newInst Instruction to replace the constant with
/// @param operandIndex Index of the constant vector operand in the parent instruction
/// @param user The original user of the expression.
void replaceConstantWith(llvm::Constant* exprOrVec, llvm::Instruction* newInst, int operandIndex, llvm::Instruction* user);
};
} // namespace IGC
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