1 //===- RegisterUsageInfo.cpp - Register Usage Informartion Storage --------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 /// This pass is required to take advantage of the interprocedural register
11 /// allocation infrastructure.
13 //===----------------------------------------------------------------------===//
15 #include "llvm/CodeGen/RegisterUsageInfo.h"
16 #include "llvm/CodeGen/MachineOperand.h"
17 #include "llvm/IR/Module.h"
18 #include "llvm/Support/Debug.h"
19 #include "llvm/Support/raw_ostream.h"
23 #define DEBUG_TYPE "ip-regalloc"
25 static cl::opt<bool> DumpRegUsage(
26 "print-regusage", cl::init(false), cl::Hidden,
27 cl::desc("print register usage details collected for analysis."));
29 INITIALIZE_PASS(PhysicalRegisterUsageInfo, "reg-usage-info",
30 "Register Usage Informartion Stroage", false, true)
32 char PhysicalRegisterUsageInfo::ID = 0;
34 void PhysicalRegisterUsageInfo::anchor() {}
36 bool PhysicalRegisterUsageInfo::doInitialization(Module &M) {
37 RegMasks.grow(M.size());
41 bool PhysicalRegisterUsageInfo::doFinalization(Module &M) {
45 RegMasks.shrink_and_clear();
49 void PhysicalRegisterUsageInfo::storeUpdateRegUsageInfo(
50 const Function *FP, std::vector<uint32_t> RegMask) {
51 assert(FP != nullptr && "Function * can't be nullptr.");
52 RegMasks[FP] = std::move(RegMask);
55 const std::vector<uint32_t> *
56 PhysicalRegisterUsageInfo::getRegUsageInfo(const Function *FP) {
57 auto It = RegMasks.find(FP);
58 if (It != RegMasks.end())
63 void PhysicalRegisterUsageInfo::print(raw_ostream &OS, const Module *M) const {
64 const TargetRegisterInfo *TRI;
66 typedef std::pair<const Function *, std::vector<uint32_t>> FuncPtrRegMaskPair;
68 SmallVector<const FuncPtrRegMaskPair *, 64> FPRMPairVector;
70 // Create a vector of pointer to RegMasks entries
71 for (const auto &RegMask : RegMasks)
72 FPRMPairVector.push_back(&RegMask);
74 // sort the vector to print analysis in alphabatic order of function name.
76 FPRMPairVector.begin(), FPRMPairVector.end(),
77 [](const FuncPtrRegMaskPair *A, const FuncPtrRegMaskPair *B) -> bool {
78 return A->first->getName() < B->first->getName();
81 for (const FuncPtrRegMaskPair *FPRMPair : FPRMPairVector) {
82 OS << FPRMPair->first->getName() << " "
83 << "Clobbered Registers: ";
84 TRI = TM->getSubtarget<TargetSubtargetInfo>(*(FPRMPair->first))
87 for (unsigned PReg = 1, PRegE = TRI->getNumRegs(); PReg < PRegE; ++PReg) {
88 if (MachineOperand::clobbersPhysReg(&(FPRMPair->second[0]), PReg))
89 OS << TRI->getName(PReg) << " ";