[llvm-exegesis] Implements a cache of Instruction objects.

llvm-svn: 345130

1 files changed, 15 insertions, 4 deletions

diff --git a/llvm/tools/llvm-exegesis/lib/MCInstrDescView.cpp b/llvm/tools/llvm-exegesis/lib/MCInstrDescView.cpp
index 2b4624b9b64..e0521af4d19 100644
--- a/llvm/tools/llvm-exegesis/lib/MCInstrDescView.cpp
+++ b/llvm/tools/llvm-exegesis/lib/MCInstrDescView.cpp
@@ -95,10 +95,10 @@ const llvm::MCOperandInfo &Operand::getExplicitOperandInfo() const {
   return *Info;
 }
 
-Instruction::Instruction(const LLVMState &State, unsigned Opcode)
-    : Description(&State.getInstrInfo().get(Opcode)),
-      Name(State.getInstrInfo().getName(Opcode)) {
-  const auto &RATC = State.getRATC();
+Instruction::Instruction(const llvm::MCInstrInfo &InstrInfo,
+                         const RegisterAliasingTrackerCache &RATC,
+                         unsigned Opcode)
+    : Description(&InstrInfo.get(Opcode)), Name(InstrInfo.getName(Opcode)) {
   unsigned OpIndex = 0;
   for (; OpIndex < Description->getNumOperands(); ++OpIndex) {
     const auto &OpInfo = Description->opInfo_begin()[OpIndex];
@@ -262,6 +262,17 @@ void Instruction::dump(const llvm::MCRegisterInfo &RegInfo,
     Stream << "- hasAliasingRegisters\n";
 }
 
+InstructionsCache::InstructionsCache(const llvm::MCInstrInfo &InstrInfo,
+                                     const RegisterAliasingTrackerCache &RATC)
+    : InstrInfo(InstrInfo), RATC(RATC) {}
+
+const Instruction &InstructionsCache::getInstr(unsigned Opcode) const {
+  auto &Found = Instructions[Opcode];
+  if (!Found)
+    Found.reset(new Instruction(InstrInfo, RATC, Opcode));
+  return *Found;
+}
+
 bool RegisterOperandAssignment::
 operator==(const RegisterOperandAssignment &Other) const {
   return std::tie(Op, Reg) == std::tie(Other.Op, Other.Reg);