MIPS: Define __mips16 macro if -mips16 option is provided.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159753 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 713396c..3eaa651 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -3599,6 +3599,7 @@
 class MipsTargetInfoBase : public TargetInfo {
   static const Builtin::Info BuiltinInfo[];
   std::string CPU;
+  bool IsMips16;
   enum MipsFloatABI {
     HardFloat, SingleFloat, SoftFloat
   } FloatABI;
@@ -3612,6 +3613,7 @@
                      const std::string& CPUStr)
     : TargetInfo(triple),
       CPU(CPUStr),
+      IsMips16(false),
       FloatABI(HardFloat),
       ABI(ABIStr)
   {}
@@ -3643,6 +3645,9 @@
       break;
     }
 
+    if (IsMips16)
+      Builder.defineMacro("__mips16", Twine(1));
+
     Builder.defineMacro("_MIPS_SZPTR", Twine(getPointerWidth(0)));
     Builder.defineMacro("_MIPS_SZINT", Twine(getIntWidth()));
     Builder.defineMacro("_MIPS_SZLONG", Twine(getLongWidth()));
@@ -3722,6 +3727,7 @@
   }
 
   virtual void HandleTargetFeatures(std::vector<std::string> &Features) {
+    IsMips16 = false;
     FloatABI = HardFloat;
 
     for (std::vector<std::string>::iterator it = Features.begin(),
@@ -3730,6 +3736,8 @@
         FloatABI = SingleFloat;
       else if (*it == "+soft-float")
         FloatABI = SoftFloat;
+      else if (*it == "+mips16")
+        IsMips16 = true;
     }
 
     // Remove front-end specific option.