1 //===----------------------------------------------------------------------===//
2 // Instruction Selector Subtarget Control
3 //===----------------------------------------------------------------------===//
4 
5 //===----------------------------------------------------------------------===//
6 // This file defines a pass used to change the subtarget for the
7 // Mips Instruction selector.
8 //
9 //===----------------------------------------------------------------------===//
10 
11 #include "Mips.h"
12 #include "MipsTargetMachine.h"
13 #include "llvm/CodeGen/TargetPassConfig.h"
14 #include "llvm/Support/Debug.h"
15 #include "llvm/Support/raw_ostream.h"
16 
17 using namespace llvm;
18 
19 #define DEBUG_TYPE "mips-isel"
20 
21 namespace {
22   class MipsModuleDAGToDAGISel : public MachineFunctionPass {
23   public:
24     static char ID;
25 
26     MipsModuleDAGToDAGISel() : MachineFunctionPass(ID) {}
27 
28     // Pass Name
29     StringRef getPassName() const override {
30       return "MIPS DAG->DAG Pattern Instruction Selection";
31     }
32 
33     void getAnalysisUsage(AnalysisUsage &AU) const override {
34       AU.addRequired<TargetPassConfig>();
35       MachineFunctionPass::getAnalysisUsage(AU);
36     }
37 
38     bool runOnMachineFunction(MachineFunction &MF) override;
39   };
40 
41   char MipsModuleDAGToDAGISel::ID = 0;
42 }
43 
44 bool MipsModuleDAGToDAGISel::runOnMachineFunction(MachineFunction &MF) {
45   DEBUG(errs() << "In MipsModuleDAGToDAGISel::runMachineFunction\n");
46   auto &TPC = getAnalysis<TargetPassConfig>();
47   auto &TM = TPC.getTM<MipsTargetMachine>();
48   TM.resetSubtarget(&MF);
49   return false;
50 }
51 
52 llvm::FunctionPass *llvm::createMipsModuleISelDagPass() {
53   return new MipsModuleDAGToDAGISel();
54 }
55