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//===- RegisterUsageInfo.cpp - Register Usage Information Storage ---------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// This pass is required to take advantage of the interprocedural register
/// allocation infrastructure.
///
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/RegisterUsageInfo.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include <cstdint>
#include <utility>
#include <vector>
using namespace llvm;
static cl::opt<bool> DumpRegUsage(
"print-regusage", cl::init(false), cl::Hidden,
cl::desc("print register usage details collected for analysis."));
INITIALIZE_PASS(PhysicalRegisterUsageInfo, "reg-usage-info",
"Register Usage Information Storage", false, true)
char PhysicalRegisterUsageInfo::ID = 0;
void PhysicalRegisterUsageInfo::setTargetMachine(const LLVMTargetMachine &TM) {
this->TM = &TM;
}
bool PhysicalRegisterUsageInfo::doInitialization(Module &M) {
RegMasks.grow(M.size());
return false;
}
bool PhysicalRegisterUsageInfo::doFinalization(Module &M) {
if (DumpRegUsage)
print(errs());
RegMasks.shrink_and_clear();
return false;
}
void PhysicalRegisterUsageInfo::storeUpdateRegUsageInfo(
const Function &FP, ArrayRef<uint32_t> RegMask) {
RegMasks[&FP] = RegMask;
}
ArrayRef<uint32_t>
PhysicalRegisterUsageInfo::getRegUsageInfo(const Function &FP) {
auto It = RegMasks.find(&FP);
if (It != RegMasks.end())
return ArrayRef<uint32_t>(It->second);
return ArrayRef<uint32_t>();
}
void PhysicalRegisterUsageInfo::print(raw_ostream &OS, const Module *M) const {
using FuncPtrRegMaskPair = std::pair<const Function *, std::vector<uint32_t>>;
SmallVector<const FuncPtrRegMaskPair *, 64> FPRMPairVector;
// Create a vector of pointer to RegMasks entries
for (const auto &RegMask : RegMasks)
FPRMPairVector.push_back(&RegMask);
// sort the vector to print analysis in alphabatic order of function name.
llvm::sort(
FPRMPairVector,
[](const FuncPtrRegMaskPair *A, const FuncPtrRegMaskPair *B) -> bool {
return A->first->getName() < B->first->getName();
});
for (const FuncPtrRegMaskPair *FPRMPair : FPRMPairVector) {
OS << FPRMPair->first->getName() << " "
<< "Clobbered Registers: ";
const TargetRegisterInfo *TRI
= TM->getSubtarget<TargetSubtargetInfo>(*(FPRMPair->first))
.getRegisterInfo();
for (unsigned PReg = 1, PRegE = TRI->getNumRegs(); PReg < PRegE; ++PReg) {
if (MachineOperand::clobbersPhysReg(&(FPRMPair->second[0]), PReg))
OS << printReg(PReg, TRI) << " ";
}
OS << "\n";
}
}
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