[Hexagon] Implement HexagonSubtarget::useAA()

llvm-svn: 319477

2 files changed, 14 insertions, 1 deletions

diff --git a/llvm/lib/Target/Hexagon/HexagonSubtarget.cpp b/llvm/lib/Target/Hexagon/HexagonSubtarget.cpp
index 7596bb5a435..37f1e455b23 100644
--- a/llvm/lib/Target/Hexagon/HexagonSubtarget.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonSubtarget.cpp
@@ -92,7 +92,7 @@ static cl::opt<bool> EnableCheckBankConflict("hexagon-check-bank-conflict",
 
 HexagonSubtarget::HexagonSubtarget(const Triple &TT, StringRef CPU,
                                    StringRef FS, const TargetMachine &TM)
-    : HexagonGenSubtargetInfo(TT, CPU, FS),
+    : HexagonGenSubtargetInfo(TT, CPU, FS), OptLevel(TM.getOptLevel()),
       CPUString(Hexagon_MC::selectHexagonCPU(TT, CPU)),
       InstrInfo(initializeSubtargetDependencies(CPU, FS)),
       RegInfo(getHwMode()), TLInfo(TM, *this),
@@ -294,6 +294,14 @@ void HexagonSubtarget::BankConflictMutation::apply(ScheduleDAGInstrs *DAG) {
   }
 }
 
+/// \brief Enable use of alias analysis during code generation (during MI
+/// scheduling, DAGCombine, etc.).
+bool HexagonSubtarget::useAA() const {
+  if (OptLevel != CodeGenOpt::None)
+    return true;
+  return false;
+}
+
 /// \brief Perform target specific adjustments to the latency of a schedule
 /// dependency.
 void HexagonSubtarget::adjustSchedDependency(SUnit *Src, SUnit *Dst,
diff --git a/llvm/lib/Target/Hexagon/HexagonSubtarget.h b/llvm/lib/Target/Hexagon/HexagonSubtarget.h
index 76892454d8a..ea69bd34192 100644
--- a/llvm/lib/Target/Hexagon/HexagonSubtarget.h
+++ b/llvm/lib/Target/Hexagon/HexagonSubtarget.h
@@ -53,6 +53,7 @@ class HexagonSubtarget : public HexagonGenSubtargetInfo {
 public:
   Hexagon::ArchEnum HexagonArchVersion;
   Hexagon::ArchEnum HexagonHVXVersion = Hexagon::ArchEnum::V4;
+  CodeGenOpt::Level OptLevel;
   /// True if the target should use Back-Skip-Back scheduling. This is the
   /// default for V60.
   bool UseBSBScheduling;
@@ -177,6 +178,10 @@ public:
       std::vector<std::unique_ptr<ScheduleDAGMutation>> &Mutations)
       const override;
 
+  /// \brief Enable use of alias analysis during code generation (during MI
+  /// scheduling, DAGCombine, etc.).
+  bool useAA() const override;
+
   /// \brief Perform target specific adjustments to the latency of a schedule
   /// dependency.
   void adjustSchedDependency(SUnit *def, SUnit *use, SDep& dep) const override;