4 files changed, 40 insertions, 5 deletions

diff --git a/include/llvm/CodeGen/AsmPrinter.h b/include/llvm/CodeGen/AsmPrinter.h
index 59d14cc..5462212 100644
--- a/include/llvm/CodeGen/AsmPrinter.h
+++ b/include/llvm/CodeGen/AsmPrinter.h
@@ -41,6 +41,7 @@ namespace llvm {
   class MCAsmInfo;
   class MCCFIInstruction;
   class MCContext;
+  class MCInstrInfo;
   class MCSection;
   class MCStreamer;
   class MCSymbol;
@@ -64,6 +65,7 @@ namespace llvm {
     ///
     const MCAsmInfo *MAI;
 
+    const MCInstrInfo *MII;
     /// OutContext - This is the context for the output file that we are
     /// streaming.  This owns all of the global MC-related objects for the
     /// generated translation unit.
diff --git a/include/llvm/MC/MCInstrDesc.h b/include/llvm/MC/MCInstrDesc.h
index 310f706..84d6380 100644
--- a/include/llvm/MC/MCInstrDesc.h
+++ b/include/llvm/MC/MCInstrDesc.h
@@ -17,6 +17,7 @@
 
 #include "llvm/MC/MCInst.h"
 #include "llvm/MC/MCRegisterInfo.h"
+#include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/Support/DataTypes.h"
 
 namespace llvm {
@@ -145,6 +146,10 @@ public:
   const uint16_t *ImplicitUses;  // Registers implicitly read by this instr
   const uint16_t *ImplicitDefs;  // Registers implicitly defined by this instr
   const MCOperandInfo *OpInfo;   // 'NumOperands' entries about operands
+  uint64_t DeprecatedFeatureMask;// Feature bits that this is deprecated on, if any
+  // A complex method to determine is a certain is deprecated or not, and return
+  // the reason for deprecation.
+  bool (*ComplexDeprecationInfo)(MCInst &, MCSubtargetInfo &, std::string &);
 
   /// \brief Returns the value of the specific constraint if
   /// it is set. Returns -1 if it is not set.
@@ -158,6 +163,20 @@ public:
     return -1;
   }
 
+  /// \brief Returns true if a certain instruction is deprecated and if so
+  /// returns the reason in \p Info.
+  bool getDeprecatedInfo(MCInst &MI, MCSubtargetInfo &STI,
+                         std::string &Info) const {
+    if (ComplexDeprecationInfo)
+      return ComplexDeprecationInfo(MI, STI, Info);
+    if (DeprecatedFeatureMask != 0) {
+      // FIXME: it would be nice to include the subtarget feature here.
+      Info = "deprecated";
+      return true;
+    }
+    return false;
+  }
+
   /// \brief Return the opcode number for this descriptor.
   unsigned getOpcode() const {
     return Opcode;
diff --git a/include/llvm/Support/TargetRegistry.h b/include/llvm/Support/TargetRegistry.h
index 9282853..05f7cf2 100644
--- a/include/llvm/Support/TargetRegistry.h
+++ b/include/llvm/Support/TargetRegistry.h
@@ -108,7 +108,8 @@ namespace llvm {
                                                 StringRef TT,
                                                 StringRef CPU);
     typedef MCTargetAsmParser *(*MCAsmParserCtorTy)(MCSubtargetInfo &STI,
-                                                    MCAsmParser &P);
+                                                    MCAsmParser &P,
+                                                    const MCInstrInfo &MII);
     typedef MCDisassembler *(*MCDisassemblerCtorTy)(const Target &T,
                                                     const MCSubtargetInfo &STI);
     typedef MCInstPrinter *(*MCInstPrinterCtorTy)(const Target &T,
@@ -386,10 +387,11 @@ namespace llvm {
     /// \param Parser The target independent parser implementation to use for
     /// parsing and lexing.
     MCTargetAsmParser *createMCAsmParser(MCSubtargetInfo &STI,
-                                         MCAsmParser &Parser) const {
+                                         MCAsmParser &Parser,
+                                         const MCInstrInfo &MII) const {
       if (!MCAsmParserCtorFn)
         return 0;
-      return MCAsmParserCtorFn(STI, Parser);
+      return MCAsmParserCtorFn(STI, Parser, MII);
     }
 
     /// createAsmPrinter - Create a target specific assembly printer pass.  This
@@ -1142,8 +1144,9 @@ namespace llvm {
     }
 
   private:
-    static MCTargetAsmParser *Allocator(MCSubtargetInfo &STI, MCAsmParser &P) {
-      return new MCAsmParserImpl(STI, P);
+    static MCTargetAsmParser *Allocator(MCSubtargetInfo &STI, MCAsmParser &P,
+                                        const MCInstrInfo &MII) {
+      return new MCAsmParserImpl(STI, P, MII);
     }
   };
 
diff --git a/include/llvm/Target/Target.td b/include/llvm/Target/Target.td
index b7f3693..c15a4ab 100644
--- a/include/llvm/Target/Target.td
+++ b/include/llvm/Target/Target.td
@@ -1010,6 +1010,17 @@ class SubtargetFeature<string n, string a,  string v, string d,
   list<SubtargetFeature> Implies = i;
 }
 
+/// Specifies a Subtarget feature that this instruction is deprecated on.
+class Deprecated<SubtargetFeature dep> {
+  SubtargetFeature DeprecatedFeatureMask = dep;
+}
+
+/// A custom predicate used to determine if an instruction is
+/// deprecated or not.
+class ComplexDeprecationPredicate<string dep> {
+  string ComplexDeprecationPredicate = dep;
+}
+
 //===----------------------------------------------------------------------===//
 // Processor chip sets - These values represent each of the chip sets supported
 // by the scheduler.  Each Processor definition requires corresponding