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/*========================== begin_copyright_notice ============================
Copyright (C) 2017-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#pragma once
#include "Compiler/MetaDataUtilsWrapper.h"
#include "common/LLVMWarningsPush.hpp"
#include <llvm/Pass.h>
#include <llvm/IR/Operator.h>
#include "common/LLVMWarningsPop.hpp"
namespace IGC
{
/// @brief This pass sets llvm fast math flags to relevant instructions, according
/// to the present compiler options.
/// -no-signed-zeros and -unsafe-math-optimizations sets nsz flag
/// -finite-math-only sets nnan and ninf flags
/// -fast-relaxed-math sets fast flag which implies all others (including arcp)
class SetFastMathFlags : public llvm::ModulePass
{
public:
/// @brief Pass identification.
static char ID;
SetFastMathFlags();
SetFastMathFlags(llvm::FastMathFlags Mask);
SetFastMathFlags(llvm::FastMathFlags Mask, bool skipUnsafeFpMathAttr);
~SetFastMathFlags() {}
virtual llvm::StringRef getPassName() const override
{
return "SetFastMathFlags";
}
virtual bool runOnModule(llvm::Module& M) override;
virtual void getAnalysisUsage(llvm::AnalysisUsage& AU) const override
{
AU.setPreservesCFG();
AU.addRequired<MetaDataUtilsWrapper>();
}
private:
/// @brief sets the given flags to all instruction supporting fast math flags in the given module.
/// @param F - the function
/// @param fmfs - the fast math flags
/// @return true if made any changes to the module.
static bool setFlags(llvm::Function& F, llvm::FastMathFlags fmfs);
llvm::FastMathFlags m_Mask;
// We need to distinguish between when the compiler uses the FastRelaxedMath flag alone
// and when uses the FastRelaxedMath flag with unsafe-fp-math attribute.
// For the option one, we set the new bool variable to true (we skip unsafe-fp-math attribute)
bool m_skipUnsafeFpMathAttr = false;
};
} // namespace IGC
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