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/*========================== begin_copyright_notice ============================
Copyright (C) 2018-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#pragma once
#include "Compiler/MetaDataUtilsWrapper.h"
#include "Compiler/CodeGenContextWrapper.hpp"
#include "common/LLVMWarningsPush.hpp"
#include <llvm/Pass.h>
#include "llvm/IR/Instructions.h"
#include <llvm/IR/Function.h>
#include "llvm/IR/Module.h"
#include <llvm/Analysis/AssumptionCache.h>
#include "common/LLVMWarningsPop.hpp"
namespace IGC {
// forward decl
namespace IGCMD {
class MetaDataUtils;
}
//
// CodeAssumption inserts llvm.assume to make sure some of code's
// attributes holds. For example, OCL's get_global_id() will be
// always positive, so we insert llvm.assume for its return value.
// This llvm.assume will help value tracking (verifying whether an
// value is positive or not). Currently, value tracking is used
// by StatelessToStateful optimization.
//
class CodeAssumption : public llvm::ModulePass {
public:
static char ID;
CodeAssumption() : ModulePass(ID), m_changed(false) {}
llvm::StringRef getPassName() const override { return "CodeAssumption"; }
bool runOnModule(llvm::Module &) override;
void getAnalysisUsage(llvm::AnalysisUsage &AU) const override {
AU.setPreservesCFG();
AU.addRequired<MetaDataUtilsWrapper>();
AU.addRequired<CodeGenContextWrapper>();
}
// APIs used directly
static bool addAssumption(llvm::Function *F, llvm::AssumptionCache *AC);
static bool IsSGIdUniform(IGCMD::MetaDataUtils *pMDU, ModuleMetaData *modMD, llvm::Function *F);
private:
bool m_changed{};
IGCMD::MetaDataUtils *m_pMDUtils = nullptr;
// Simple change to help uniform analysis (later).
void uniformHelper(llvm::Module *M);
// Add llvm.assume to assist other optimization such statelessToStateful
void addAssumption(llvm::Module *M);
// helpers
static bool isPositiveIndVar(llvm::PHINode *PN, const llvm::DataLayout *DL, llvm::AssumptionCache *AC);
};
} // namespace IGC
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