1 //===------ LeonPasses.cpp - Define passes specific to LEON ---------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "LeonPasses.h"
14 #include "llvm/CodeGen/MachineFunction.h"
15 #include "llvm/CodeGen/ISDOpcodes.h"
16 #include "llvm/Support/raw_ostream.h"
17 #include "llvm/IR/LLVMContext.h"
18 #include "llvm/CodeGen/MachineInstrBuilder.h"
19 #include "llvm/CodeGen/MachineInstr.h"
20 #include "llvm/CodeGen/MachineRegisterInfo.h"
21 using namespace llvm;
22 
23 LEONMachineFunctionPass::LEONMachineFunctionPass(TargetMachine &tm, char& ID) :
24   MachineFunctionPass(ID)
25 {
26 }
27 
28 LEONMachineFunctionPass::LEONMachineFunctionPass(char& ID) :
29   MachineFunctionPass(ID)
30 {
31 }
32 
33 //*****************************************************************************
34 //**** InsertNOPLoad pass
35 //*****************************************************************************
36 //This pass inserts a NOP after any LD or LDF instruction.
37 //
38 char InsertNOPLoad::ID = 0;
39 
40 InsertNOPLoad::InsertNOPLoad(TargetMachine &tm) :
41                     LEONMachineFunctionPass(tm, ID)
42 {
43 }
44 
45 bool InsertNOPLoad::runOnMachineFunction(MachineFunction& MF)
46 {
47   Subtarget = &MF.getSubtarget<SparcSubtarget>();
48   const TargetInstrInfo& TII = *Subtarget->getInstrInfo();
49   DebugLoc DL = DebugLoc();
50 
51   bool Modified = false;
52   for (auto MFI = MF.begin(), E = MF.end(); MFI != E; ++MFI) {
53     MachineBasicBlock &MBB = *MFI;
54     for (auto MBBI = MBB.begin(), E = MBB.end(); MBBI != E; ++ MBBI) {
55       MachineInstr &MI = *MBBI;
56       unsigned Opcode = MI.getOpcode();
57       if (Opcode >=  SP::LDDArr && Opcode <= SP::LDrr) {
58         //errs() << "Inserting NOP after LD instruction\n";
59         MachineBasicBlock::iterator NMBBI = std::next(MBBI);
60         BuildMI(MBB, NMBBI, DL, TII.get(SP::NOP));
61         Modified = true;
62       }
63       else if (MI.isInlineAsm()) {
64         // Look for an inline ld or ldf instruction.
65         StringRef AsmString =
66             MI.getOperand(InlineAsm::MIOp_AsmString).getSymbolName();
67         if (AsmString.startswith_lower("ld")) {
68           //errs() << "Inserting NOP after LD instruction\n";
69           MachineBasicBlock::iterator NMBBI = std::next(MBBI);
70           BuildMI(MBB, NMBBI, DL, TII.get(SP::NOP));
71           Modified = true;
72         }
73       }
74     }
75   }
76 
77   return Modified;
78 }
79