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/*========================== begin_copyright_notice ============================
Copyright (C) 2022 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "Compiler/Optimizer/OpenCLPasses/RegPressureLoopControl/RegPressureLoopControl.hpp"
#include "Compiler/IGCPassSupport.h"
#include "GenISAIntrinsics/GenIntrinsicInst.h"
#include "common/LLVMWarningsPush.hpp"
#include <llvm/IR/BasicBlock.h>
#include "common/LLVMWarningsPop.hpp"
using namespace IGC;
using namespace llvm;
// Register pass to igc-opt
#define PASS_FLAG "igc-register-pressure-loop-control"
#define PASS_DESCRIPTION "Controls the register pressure for given loop"
#define PASS_CFG_ONLY false
#define PASS_ANALYSIS false
IGC_INITIALIZE_PASS_BEGIN(RegPressureLoopControl, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
IGC_INITIALIZE_PASS_DEPENDENCY(CodeGenContextWrapper)
IGC_INITIALIZE_PASS_DEPENDENCY(RegisterPressureEstimate)
IGC_INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
IGC_INITIALIZE_PASS_END(RegPressureLoopControl, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
char RegPressureLoopControl::ID = 0;
const int RegPressureLoopControl::MaxRegPressureLoopHdr = 2000;
RegPressureLoopControl::RegPressureLoopControl() : llvm::FunctionPass(ID) {
initializeRegPressureLoopControlPass(*PassRegistry::getPassRegistry());
}
bool RegPressureLoopControl::runOnFunction(llvm::Function &pFunc) {
LoopInfo &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
m_pRegisterPressureEstimate = &getAnalysis<RegisterPressureEstimate>();
IGC::CodeGenContext *pCtx =
getAnalysis<CodeGenContextWrapper>().getCodeGenContext();
pCtx->m_FuncHasExpensiveLoops[&pFunc] = false;
for (auto LI_i : LI) {
llvm::Loop *L = LI_i;
IGC_ASSERT(nullptr != m_pRegisterPressureEstimate);
// if no live range info
if (!m_pRegisterPressureEstimate->isAvailable()) {
continue;
}
m_pRegisterPressureEstimate->buildRPMapPerInstruction();
llvm::BasicBlock *Header = L->getLoopPreheader();
int hdrRegPressure =
m_pRegisterPressureEstimate->getMaxRegisterPressure(Header);
if (hdrRegPressure > MaxRegPressureLoopHdr) {
pCtx->m_FuncHasExpensiveLoops[&pFunc] = true;
return false;
}
}
return false;
}
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