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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/InstVisitor.h>
#include "common/LLVMWarningsPop.hpp"
namespace IGC {
/// @brief if the proper compiler option is present, makes sure usages of single precision floating point
/// sqrt and divide are IEEE compliant, otherwise does nothing.
/// Achieved by replacing div and sqrt with calls to compliant versions.
class CorrectlyRoundedDivSqrt : public llvm::ModulePass, public llvm::InstVisitor<CorrectlyRoundedDivSqrt> {
public:
/// @brief Pass identification.
static char ID;
CorrectlyRoundedDivSqrt();
CorrectlyRoundedDivSqrt(bool forceCR, bool HasHalf);
~CorrectlyRoundedDivSqrt() {}
virtual llvm::StringRef getPassName() const override { return "CorrectlyRoundedDivSqrt"; }
virtual bool runOnModule(llvm::Module &M) override;
virtual void getAnalysisUsage(llvm::AnalysisUsage &AU) const override {
AU.setPreservesCFG();
AU.addRequired<MetaDataUtilsWrapper>();
}
/// @brief replace given divide instruction with a call to a correctly rounded version.
/// @param I - the fdiv instruction.
void visitFDiv(llvm::BinaryOperator &I);
private:
/// @brief if the given function is a sqrt function, replace the declaration with a correctly rounded version.
/// @param F - the function.
/// @return true if the function was changed.
static bool processDeclaration(llvm::Function &F);
llvm::Value *emitIEEEDivide(llvm::BinaryOperator *I, llvm::Value *Op0, llvm::Value *Op1);
/// @brief Indicates if the pass changed the processed function
bool m_changed = false;
/// @brief Indicates that correctly rounded sqrt/div should be used even
/// when the option is not present in the module metadata.
bool m_forceCR;
bool m_hasHalfTy;
bool m_IsCorrectlyRounded;
llvm::Module *m_module = nullptr;
};
} // namespace IGC
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