Add Clang support for -mdirect-move on PPC

[nemanjai]

Summary

This is to complete the changes in review D8928 for supporting FP <-> INT conversions using direct move instructions.

[wschmidt]

This LGTM.

[nemanjai]

Committed revision 234683.

include/clang/Driver/Options.td

 def mpower8_vector : Flag<["-"], "mpower8-vector">,
     Group<m_ppc_Features_Group>;
 def mno_power8_vector : Flag<["-"], "mno-power8-vector">,
     Group<m_ppc_Features_Group>;
 def mpower8_crypto : Flag<["-"], "mcrypto">,
     Group<m_ppc_Features_Group>;
 def mnopower8_crypto : Flag<["-"], "mno-crypto">,
     Group<m_ppc_Features_Group>;
+def mdirect_move : Flag<["-"], "mdirect-move">,
+    Group<m_ppc_Features_Group>;
+def mnodirect_move : Flag<["-"], "mno-direct-move">,
+    Group<m_ppc_Features_Group>;
 def mhtm : Flag<["-"], "mhtm">, Group<m_ppc_Features_Group>;
 def mno_htm : Flag<["-"], "mno-htm">, Group<m_ppc_Features_Group>;
 def mfprnd : Flag<["-"], "mfprnd">, Group<m_ppc_Features_Group>;
 def mno_fprnd : Flag<["-"], "mno-fprnd">, Group<m_ppc_Features_Group>;
 def mcmpb : Flag<["-"], "mcmpb">, Group<m_ppc_Features_Group>;
 def mno_cmpb : Flag<["-"], "mno-cmpb">, Group<m_ppc_Features_Group>;
 def mmfcrf : Flag<["-"], "mmfcrf">, Group<m_ppc_Features_Group>;
 def mno_mfcrf : Flag<["-"], "mno-mfcrf">, Group<m_ppc_Features_Group>;

lib/Basic/Targets.cpp

class PPCTargetInfo : public TargetInfo {
   static const char * const GCCRegNames[];
   static const TargetInfo::GCCRegAlias GCCRegAliases[];
   std::string CPU;
 
   // Target cpu features.
   bool HasVSX;
   bool HasP8Vector;
   bool HasP8Crypto;
+  bool HasDirectMove;
   bool HasQPX;
   bool HasHTM;
 
 protected:
   std::string ABI;
 
 public:
   PPCTargetInfo(const llvm::Triple &Triple)
     : TargetInfo(Triple), HasVSX(false), HasP8Vector(false),
-      HasP8Crypto(false), HasQPX(false), HasHTM(false) {
+      HasP8Crypto(false), HasDirectMove(false), HasQPX(false), HasHTM(false) {
     BigEndian = (Triple.getArch() != llvm::Triple::ppc64le);
     LongDoubleWidth = LongDoubleAlign = 128;
     LongDoubleFormat = &llvm::APFloat::PPCDoubleDouble;
   }
 
   /// \brief Flags for architecture specific defines.
   typedef enum {
     ArchDefineNone  = 0,
if (Feature == "power8-vector") {
       continue;
     }
 
     if (Feature == "crypto") {
       HasP8Crypto = true;
       continue;
     }
 
+    if (Feature == "direct-move") {
+      HasDirectMove = true;
+      continue;
+    }
+
     if (Feature == "qpx") {
       HasQPX = true;
       continue;
     }
 
     if (Feature == "htm") {
       HasHTM = true;
       continue;
void PPCTargetInfo::getDefaultFeatures(llvm::StringMap<bool> &Features) const {
   Features["crypto"] = llvm::StringSwitch<bool>(CPU)
     .Case("ppc64le", true)
     .Case("pwr8", true)
     .Default(false);
   Features["power8-vector"] = llvm::StringSwitch<bool>(CPU)
     .Case("ppc64le", true)
     .Case("pwr8", true)
     .Default(false);
+  Features["direct-move"] = llvm::StringSwitch<bool>(CPU)
+    .Case("ppc64le", true)
+    .Case("pwr8", true)
+    .Default(false);
 }
 
 bool PPCTargetInfo::hasFeature(StringRef Feature) const {
   return llvm::StringSwitch<bool>(Feature)
     .Case("powerpc", true)
     .Case("vsx", HasVSX)
     .Case("power8-vector", HasP8Vector)
     .Case("crypto", HasP8Crypto)
+    .Case("direct-move", HasDirectMove)
     .Case("qpx", HasQPX)
     .Case("htm", HasHTM)
     .Default(false);
 }
 
 const char * const PPCTargetInfo::GCCRegNames[] = {
   "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
   "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",