PPC: Refactoring to support subtarget feature changing

This change mirrors the changes that were made to the X86 and ARM targets to
support subtarget feature changing. As indicated in r182899, the mechanism is
still undergoing revision, and so as with the X86 and ARM targets, there is no
test case yet (there is no effective functionality change).

llvm-svn: 186357

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCSubtarget.h b/llvm/lib/Target/PowerPC/PPCSubtarget.h
index 097f2bc75ce..50af75d13f4 100644
--- a/llvm/lib/Target/PowerPC/PPCSubtarget.h
+++ b/llvm/lib/Target/PowerPC/PPCSubtarget.h
@@ -137,6 +137,13 @@ public:
                      : "E-p:32:32-f64:64:64-i64:64:64-f128:64:128-n32";
   }
 
+  /// \brief Reset the features for the PowerPC target.
+  virtual void resetSubtargetFeatures(const MachineFunction *MF);
+private:
+  void initializeEnvironment();
+  void resetSubtargetFeatures(StringRef CPU, StringRef FS);
+
+public:
   /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
   ///
   bool isPPC64() const { return IsPPC64; }