Use the target options specified on a function to reset the back-end.

During LTO, the target options on functions within the same Module may
change. This would necessitate resetting some of the back-end. Do this for X86,
because it's a Friday afternoon.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178917 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 16 insertions, 3 deletions

diff --git a/include/llvm/Target/TargetLowering.h b/include/llvm/Target/TargetLowering.h
index 1786bd28f3..cb62ed33a1 100644
--- a/include/llvm/Target/TargetLowering.h
+++ b/include/llvm/Target/TargetLowering.h
@@ -135,6 +135,11 @@ public:
                               const TargetLoweringObjectFile *TLOF);
   virtual ~TargetLoweringBase();
 
+protected:
+  /// \brief Initialize all of the actions to default values.
+  void initActions();
+
+public:
   const TargetMachine &getTargetMachine() const { return TM; }
   const DataLayout *getDataLayout() const { return TD; }
   const TargetLoweringObjectFile &getObjFileLowering() const { return TLOF; }
@@ -851,6 +856,9 @@ public:
   // the derived class constructor to configure this object for the target.
   //
 
+  /// \brief Reset the operation actions based on target options.
+  virtual void resetOperationActions() {}
+
 protected:
   /// setBooleanContents - Specify how the target extends the result of a
   /// boolean value from i1 to a wider type.  See getBooleanContents.
@@ -951,13 +959,17 @@ protected:
     RegClassForVT[VT.SimpleTy] = RC;
   }
 
-  /// clearRegisterClasses - remove all register classes
+  /// clearRegisterClasses - Remove all register classes.
   void clearRegisterClasses() {
-    for (unsigned i = 0 ; i<array_lengthof(RegClassForVT); i++)
-      RegClassForVT[i] = 0;
+    memset(RegClassForVT, 0,MVT::LAST_VALUETYPE * sizeof(TargetRegisterClass*));
+
     AvailableRegClasses.clear();
   }
 
+  /// \brief Remove all operation actions.
+  void clearOperationActions() {
+  }
+
   /// findRepresentativeClass - Return the largest legal super-reg register class
   /// of the register class for the specified type and its associated "cost".
   virtual std::pair<const TargetRegisterClass*, uint8_t>
diff --git a/include/llvm/Target/TargetOptions.h b/include/llvm/Target/TargetOptions.h
index c31db24490..c763a595dd 100644
--- a/include/llvm/Target/TargetOptions.h
+++ b/include/llvm/Target/TargetOptions.h
@@ -208,6 +208,7 @@ namespace llvm {
     /// the value of this option.
     FPOpFusion::FPOpFusionMode AllowFPOpFusion;
 
+    bool operator==(const TargetOptions &);
   };
 } // End llvm namespace