- Added MCSubtargetInfo to capture subtarget features and scheduling

  itineraries.
- Refactor TargetSubtarget to be based on MCSubtargetInfo.
- Change tablegen generated subtarget info to initialize MCSubtargetInfo
  and hide more details from targets.

llvm-svn: 134257

2 files changed, 16 insertions, 3 deletions

diff --git a/llvm/lib/Target/ARM/ARMSubtarget.cpp b/llvm/lib/Target/ARM/ARMSubtarget.cpp
index 694b31385b2..01acde0ffdb 100644
--- a/llvm/lib/Target/ARM/ARMSubtarget.cpp
+++ b/llvm/lib/Target/ARM/ARMSubtarget.cpp
@@ -12,11 +12,17 @@
 //===----------------------------------------------------------------------===//
 
 #include "ARMSubtarget.h"
-#include "ARMGenSubtarget.inc"
 #include "ARMBaseRegisterInfo.h"
 #include "llvm/GlobalValue.h"
+#include "llvm/Target/TargetSubtarget.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/ADT/SmallVector.h"
+
+#define GET_SUBTARGETINFO_CTOR
+#define GET_SUBTARGETINFO_MC_DESC
+#define GET_SUBTARGETINFO_TARGET_DESC
+#include "ARMGenSubtarget.inc"
+
 using namespace llvm;
 
 static cl::opt<bool>
@@ -32,7 +38,8 @@ StrictAlign("arm-strict-align", cl::Hidden,
 
 ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &CPU,
                            const std::string &FS, bool isT)
-  : ARMArchVersion(V4)
+  : ARMGenSubtargetInfo()
+  , ARMArchVersion(V4)
   , ARMProcFamily(Others)
   , ARMFPUType(None)
   , UseNEONForSinglePrecisionFP(false)
@@ -130,6 +137,9 @@ ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &CPU,
     FSWithArch = FSWithArch + "," + FS;
   ParseSubtargetFeatures(FSWithArch, CPUString);
 
+  // Initialize scheduling itinerary for the specified CPU.
+  InstrItins = getInstrItineraryForCPU(CPUString);
+
   // After parsing Itineraries, set ItinData.IssueWidth.
   computeIssueWidth();
 
diff --git a/llvm/lib/Target/ARM/ARMSubtarget.h b/llvm/lib/Target/ARM/ARMSubtarget.h
index 7c931730615..fbe83227315 100644
--- a/llvm/lib/Target/ARM/ARMSubtarget.h
+++ b/llvm/lib/Target/ARM/ARMSubtarget.h
@@ -19,10 +19,13 @@
 #include "llvm/ADT/Triple.h"
 #include <string>
 
+#define GET_SUBTARGETINFO_HEADER
+#include "ARMGenSubtarget.inc"
+
 namespace llvm {
 class GlobalValue;
 
-class ARMSubtarget : public TargetSubtarget {
+class ARMSubtarget : public ARMGenSubtargetInfo {
 protected:
   enum ARMArchEnum {
     V4, V4T, V5T, V5TE, V6, V6M, V6T2, V7A, V7M