[PowerPC] Support powerpc64le as a syntax-checking target.

This patch provides basic support for powerpc64le as an LLVM target.
However, use of this target will not actually generate little-endian
code.  Instead, use of the target will cause the correct little-endian
built-in defines to be generated, so that code that tests for
__LITTLE_ENDIAN__, for example, will be correctly parsed for
syntax-only testing.  Code generation will otherwise be the same as
powerpc64 (big-endian), for now.

The patch leaves open the possibility of creating a little-endian
PowerPC64 back end, but there is no immediate intent to create such a
thing.

The LLVM portions of this patch simply add ppc64le coverage everywhere
that ppc64 coverage currently exists.  There is nothing of any import
worth testing until such time as little-endian code generation is
implemented.  In the corresponding Clang patch, there is a new test
case variant to ensure that correct built-in defines for little-endian
code are generated.

llvm-svn: 187179

autoconf/config.guess

@@ -965,6 +965,9 @@ EOF
     ppc64:Linux:*:*)
 	echo powerpc64-unknown-linux-gnu
 	exit ;;
+    ppc64le:Linux:*:*)
+	echo powerpc64le-unknown-linux-gnu
+	exit ;;
     ppc:Linux:*:*)
 	echo powerpc-unknown-linux-gnu
 	exit ;;

autoconf/m4/libtool.m4

@@ -530,7 +530,7 @@ x86_64-*linux*|ppc*-*linux*|powerpc*-*linux*|s390*-*linux*|sparc*-*linux*)
         x86_64-*linux*)
           LD="${LD-ld} -m elf_i386"
           ;;
-        ppc64-*linux*|powerpc64-*linux*)
+        ppc64-*linux*|powerpc64-*linux*|ppc64le-*linux*|powerpc64le-*linux*)
           LD="${LD-ld} -m elf32ppclinux"
           ;;
         s390x-*linux*)

include/llvm/ADT/Triple.h

@@ -55,6 +55,7 @@ public:
     msp430,  // MSP430: msp430
     ppc,     // PPC: powerpc
     ppc64,   // PPC64: powerpc64, ppu
+    ppc64le, // PPC64LE: powerpc64le
     r600,    // R600: AMD GPUs HD2XXX - HD6XXX
     sparc,   // Sparc: sparc
     sparcv9, // Sparcv9: Sparcv9

include/llvm/Object/ELF.h

@@ -2796,7 +2796,8 @@ unsigned ELFObjectFile<ELFT>::getArch() const {
     return (ELFT::TargetEndianness == support::little) ?
            Triple::mipsel : Triple::mips;
   case ELF::EM_PPC64:
-    return Triple::ppc64;
+    return (ELFT::TargetEndianness == support::little) ?
+           Triple::ppc64le : Triple::ppc64;
   case ELF::EM_S390:
     return Triple::systemz;
   default:

lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp

@@ -396,7 +396,7 @@ uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr) {
     StubAddr++;
     *StubAddr = NopInstr;
     return Addr;
-  } else if (Arch == Triple::ppc64) {
+  } else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) {
     // PowerPC64 stub: the address points to a function descriptor
     // instead of the function itself. Load the function address
     // on r11 and sets it to control register. Also loads the function

lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp

@@ -770,7 +770,8 @@ void RuntimeDyldELF::resolveRelocation(const SectionEntry &Section,
                           (uint32_t)(Value & 0xffffffffL), Type,
                           (uint32_t)(Addend & 0xffffffffL));
     break;
-  case Triple::ppc64:
+  case Triple::ppc64:   // Fall through.
+  case Triple::ppc64le:
     resolvePPC64Relocation(Section, Offset, Value, Type, Addend);
     break;
   case Triple::systemz:
@@ -985,7 +986,7 @@ void RuntimeDyldELF::processRelocationRef(unsigned SectionID,
                         RelType, 0);
       Section.StubOffset += getMaxStubSize();
     }
-  } else if (Arch == Triple::ppc64) {
+  } else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) {
     if (RelType == ELF::R_PPC64_REL24) {
       // A PPC branch relocation will need a stub function if the target is
       // an external symbol (Symbol::ST_Unknown) or if the target address

lib/ExecutionEngine/RuntimeDyld/RuntimeDyldImpl.h

@@ -172,7 +172,7 @@ protected:
       return 8; // 32-bit instruction and 32-bit address
     else if (Arch == Triple::mipsel || Arch == Triple::mips)
       return 16;
-    else if (Arch == Triple::ppc64)
+    else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le)
       return 44;
     else if (Arch == Triple::x86_64)
       return 8; // GOT

lib/MC/MCObjectFileInfo.cpp

@@ -79,7 +79,8 @@ void MCObjectFileInfo::InitMachOMCObjectFileInfo(Triple T) {
   // to using it in -static mode.
   SixteenByteConstantSection = 0;
   if (RelocM != Reloc::Static &&
-      T.getArch() != Triple::x86_64 && T.getArch() != Triple::ppc64)
+      T.getArch() != Triple::x86_64 && T.getArch() != Triple::ppc64 &&
+      T.getArch() != Triple::ppc64le)
     SixteenByteConstantSection =   // .literal16
       Ctx->getMachOSection("__TEXT", "__literal16",
                            MCSectionMachO::S_16BYTE_LITERALS,
@@ -288,7 +289,7 @@ void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
       FDEEncoding = dwarf::DW_EH_PE_udata4;
       TTypeEncoding = dwarf::DW_EH_PE_absptr;
     }
-  } else if (T.getArch() == Triple::ppc64) {
+  } else if (T.getArch() == Triple::ppc64 || T.getArch() == Triple::ppc64le) {
     PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
       dwarf::DW_EH_PE_udata8;
     LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;

lib/Support/Triple.cpp

@@ -28,6 +28,7 @@ const char *Triple::getArchTypeName(ArchType Kind) {
   case mips64el:return "mips64el";
   case msp430:  return "msp430";
   case ppc64:   return "powerpc64";
+  case ppc64le: return "powerpc64le";
   case ppc:     return "powerpc";
   case r600:    return "r600";
   case sparc:   return "sparc";
@@ -60,6 +61,7 @@ const char *Triple::getArchTypePrefix(ArchType Kind) {
   case thumb:   return "arm";
 
   case ppc64:
+  case ppc64le:
   case ppc:     return "ppc";
 
   case mips:
@@ -168,6 +170,7 @@ Triple::ArchType Triple::getArchTypeForLLVMName(StringRef Name) {
     .Case("ppc64", ppc64)
     .Case("ppc32", ppc)
     .Case("ppc", ppc)
+    .Case("ppc64le", ppc64le)
     .Case("r600", r600)
     .Case("hexagon", hexagon)
     .Case("sparc", sparc)
@@ -197,6 +200,7 @@ const char *Triple::getArchNameForAssembler() {
     .Case("x86_64", "x86_64")
     .Case("powerpc", "ppc")
     .Case("powerpc64", "ppc64")
+    .Case("powerpc64le", "ppc64le")
     .Case("arm", "arm")
     .Cases("armv4t", "thumbv4t", "armv4t")
     .Cases("armv5", "armv5e", "thumbv5", "thumbv5e", "armv5")
@@ -220,6 +224,7 @@ static Triple::ArchType parseArch(StringRef ArchName) {
     .Cases("amd64", "x86_64", Triple::x86_64)
     .Case("powerpc", Triple::ppc)
     .Cases("powerpc64", "ppu", Triple::ppc64)
+    .Case("powerpc64le", Triple::ppc64le)
     .Case("aarch64", Triple::aarch64)
     .Cases("arm", "xscale", Triple::arm)
     // FIXME: It would be good to replace these with explicit names for all the
@@ -690,6 +695,7 @@ static unsigned getArchPointerBitWidth(llvm::Triple::ArchType Arch) {
   case llvm::Triple::mips64el:
   case llvm::Triple::nvptx64:
   case llvm::Triple::ppc64:
+  case llvm::Triple::ppc64le:
   case llvm::Triple::sparcv9:
   case llvm::Triple::systemz:
   case llvm::Triple::x86_64:
@@ -718,6 +724,7 @@ Triple Triple::get32BitArchVariant() const {
   case Triple::aarch64:
   case Triple::msp430:
   case Triple::systemz:
+  case Triple::ppc64le:
     T.setArch(UnknownArch);
     break;
 
@@ -772,6 +779,7 @@ Triple Triple::get64BitArchVariant() const {
   case Triple::mips64el:
   case Triple::nvptx64:
   case Triple::ppc64:
+  case Triple::ppc64le:
   case Triple::sparcv9:
   case Triple::systemz:
   case Triple::x86_64:

lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp

@@ -222,7 +222,8 @@ public:
     : MCTargetAsmParser(), STI(_STI), Parser(_Parser) {
     // Check for 64-bit vs. 32-bit pointer mode.
     Triple TheTriple(STI.getTargetTriple());
-    IsPPC64 = TheTriple.getArch() == Triple::ppc64;
+    IsPPC64 = (TheTriple.getArch() == Triple::ppc64 ||
+               TheTriple.getArch() == Triple::ppc64le);
     // Initialize the set of available features.
     setAvailableFeatures(ComputeAvailableFeatures(STI.getFeatureBits()));
   }
@@ -1313,6 +1314,7 @@ bool PPCAsmParser::ParseDirectiveMachine(SMLoc L) {
 extern "C" void LLVMInitializePowerPCAsmParser() {
   RegisterMCAsmParser<PPCAsmParser> A(ThePPC32Target);
   RegisterMCAsmParser<PPCAsmParser> B(ThePPC64Target);
+  RegisterMCAsmParser<PPCAsmParser> C(ThePPC64LETarget);
 }
 
 #define GET_REGISTER_MATCHER

lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp

@@ -158,7 +158,7 @@ public:
 
   unsigned getPointerSize() const {
     StringRef Name = TheTarget.getName();
-    if (Name == "ppc64") return 8;
+    if (Name == "ppc64" || Name == "ppc64le") return 8;
     assert(Name == "ppc32" && "Unknown target name!");
     return 4;
   }

lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp

@@ -42,7 +42,8 @@ static MCInstrInfo *createPPCMCInstrInfo() {
 
 static MCRegisterInfo *createPPCMCRegisterInfo(StringRef TT) {
   Triple TheTriple(TT);
-  bool isPPC64 = (TheTriple.getArch() == Triple::ppc64);
+  bool isPPC64 = (TheTriple.getArch() == Triple::ppc64 ||
+                  TheTriple.getArch() == Triple::ppc64le);
   unsigned Flavour = isPPC64 ? 0 : 1;
   unsigned RA = isPPC64 ? PPC::LR8 : PPC::LR;
 
@@ -60,7 +61,8 @@ static MCSubtargetInfo *createPPCMCSubtargetInfo(StringRef TT, StringRef CPU,
 
 static MCAsmInfo *createPPCMCAsmInfo(const MCRegisterInfo &MRI, StringRef TT) {
   Triple TheTriple(TT);
-  bool isPPC64 = TheTriple.getArch() == Triple::ppc64;
+  bool isPPC64 = (TheTriple.getArch() == Triple::ppc64 ||
+                  TheTriple.getArch() == Triple::ppc64le);
 
   MCAsmInfo *MAI;
   if (TheTriple.isOSDarwin())
@@ -91,7 +93,8 @@ static MCCodeGenInfo *createPPCMCCodeGenInfo(StringRef TT, Reloc::Model RM,
   }
   if (CM == CodeModel::Default) {
     Triple T(TT);
-    if (!T.isOSDarwin() && T.getArch() == Triple::ppc64)
+    if (!T.isOSDarwin() &&
+        (T.getArch() == Triple::ppc64 || T.getArch() == Triple::ppc64le))
       CM = CodeModel::Medium;
   }
   X->InitMCCodeGenInfo(RM, CM, OL);
@@ -125,38 +128,52 @@ extern "C" void LLVMInitializePowerPCTargetMC() {
   // Register the MC asm info.
   RegisterMCAsmInfoFn C(ThePPC32Target, createPPCMCAsmInfo);
   RegisterMCAsmInfoFn D(ThePPC64Target, createPPCMCAsmInfo);  
+  RegisterMCAsmInfoFn E(ThePPC64LETarget, createPPCMCAsmInfo);  
 
   // Register the MC codegen info.
   TargetRegistry::RegisterMCCodeGenInfo(ThePPC32Target, createPPCMCCodeGenInfo);
   TargetRegistry::RegisterMCCodeGenInfo(ThePPC64Target, createPPCMCCodeGenInfo);
+  TargetRegistry::RegisterMCCodeGenInfo(ThePPC64LETarget,
+                                        createPPCMCCodeGenInfo);
 
   // Register the MC instruction info.
   TargetRegistry::RegisterMCInstrInfo(ThePPC32Target, createPPCMCInstrInfo);
   TargetRegistry::RegisterMCInstrInfo(ThePPC64Target, createPPCMCInstrInfo);
+  TargetRegistry::RegisterMCInstrInfo(ThePPC64LETarget,
+                                      createPPCMCInstrInfo);
 
   // Register the MC register info.
   TargetRegistry::RegisterMCRegInfo(ThePPC32Target, createPPCMCRegisterInfo);
   TargetRegistry::RegisterMCRegInfo(ThePPC64Target, createPPCMCRegisterInfo);
+  TargetRegistry::RegisterMCRegInfo(ThePPC64LETarget, createPPCMCRegisterInfo);
 
   // Register the MC subtarget info.
   TargetRegistry::RegisterMCSubtargetInfo(ThePPC32Target,
                                           createPPCMCSubtargetInfo);
   TargetRegistry::RegisterMCSubtargetInfo(ThePPC64Target,
                                           createPPCMCSubtargetInfo);
+  TargetRegistry::RegisterMCSubtargetInfo(ThePPC64LETarget,
+                                          createPPCMCSubtargetInfo);
 
   // Register the MC Code Emitter
   TargetRegistry::RegisterMCCodeEmitter(ThePPC32Target, createPPCMCCodeEmitter);
   TargetRegistry::RegisterMCCodeEmitter(ThePPC64Target, createPPCMCCodeEmitter);
+  TargetRegistry::RegisterMCCodeEmitter(ThePPC64LETarget,
+                                        createPPCMCCodeEmitter);
   
     // Register the asm backend.
   TargetRegistry::RegisterMCAsmBackend(ThePPC32Target, createPPCAsmBackend);
   TargetRegistry::RegisterMCAsmBackend(ThePPC64Target, createPPCAsmBackend);
+  TargetRegistry::RegisterMCAsmBackend(ThePPC64LETarget, createPPCAsmBackend);
   
   // Register the object streamer.
   TargetRegistry::RegisterMCObjectStreamer(ThePPC32Target, createMCStreamer);
   TargetRegistry::RegisterMCObjectStreamer(ThePPC64Target, createMCStreamer);
+  TargetRegistry::RegisterMCObjectStreamer(ThePPC64LETarget, createMCStreamer);
 
   // Register the MCInstPrinter.
   TargetRegistry::RegisterMCInstPrinter(ThePPC32Target, createPPCMCInstPrinter);
   TargetRegistry::RegisterMCInstPrinter(ThePPC64Target, createPPCMCInstPrinter);
+  TargetRegistry::RegisterMCInstPrinter(ThePPC64LETarget,
+                                        createPPCMCInstPrinter);
 }

lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.h

@@ -33,6 +33,7 @@ class raw_ostream;
 
 extern Target ThePPC32Target;
 extern Target ThePPC64Target;
+extern Target ThePPC64LETarget;
   
 MCCodeEmitter *createPPCMCCodeEmitter(const MCInstrInfo &MCII,
                                       const MCRegisterInfo &MRI,

lib/Target/PowerPC/PPC.td

@@ -252,6 +252,11 @@ def : ProcessorModel<"ppc64", G5Model,
                    FeatureMFOCRF, FeatureFSqrt, FeatureFRES,
                    FeatureFRSQRTE, FeatureSTFIWX,
                    Feature64Bit /*, Feature64BitRegs */]>;
+def : ProcessorModel<"ppc64le", G5Model,
+                  [Directive64, FeatureAltivec,
+                   FeatureMFOCRF, FeatureFSqrt, FeatureFRES,
+                   FeatureFRSQRTE, FeatureSTFIWX,
+                   Feature64Bit /*, Feature64BitRegs */]>;
 
 //===----------------------------------------------------------------------===//
 // Calling Conventions

lib/Target/PowerPC/PPCAsmPrinter.cpp

@@ -839,7 +839,8 @@ void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
     "power6",
     "power6x",
     "power7",
-    "ppc64"
+    "ppc64",
+    "ppc64le"
   };
 
   unsigned Directive = Subtarget.getDarwinDirective();

lib/Target/PowerPC/PPCSubtarget.cpp

@@ -137,6 +137,9 @@ void PPCSubtarget::resetSubtargetFeatures(StringRef CPU, StringRef FS) {
   // is enabled because external functions will assume this alignment.
   if (hasQPX() || isBGQ())
     StackAlignment = 32;
+
+  // Determine endianness.
+  IsLittleEndian = (TargetTriple.getArch() == Triple::ppc64le);
 }
 
 /// hasLazyResolverStub - Return true if accesses to the specified global have

lib/Target/PowerPC/PPCSubtarget.h

@@ -89,6 +89,7 @@ protected:
   bool IsBookE;
   bool HasLazyResolverStubs;
   bool IsJITCodeModel;
+  bool IsLittleEndian;
 
   /// TargetTriple - What processor and OS we're targeting.
   Triple TargetTriple;
@@ -166,6 +167,9 @@ public:
   // isJITCodeModel - True if we're generating code for the JIT
   bool isJITCodeModel() const { return IsJITCodeModel; }
 
+  // isLittleEndian - True if generating little-endian code
+  bool isLittleEndian() const { return IsLittleEndian; }
+
   // Specific obvious features.
   bool hasFSQRT() const { return HasFSQRT; }
   bool hasFRE() const { return HasFRE; }

lib/Target/PowerPC/PPCTargetMachine.cpp

@@ -30,6 +30,7 @@ extern "C" void LLVMInitializePowerPCTarget() {
   // Register the targets
   RegisterTargetMachine<PPC32TargetMachine> A(ThePPC32Target);
   RegisterTargetMachine<PPC64TargetMachine> B(ThePPC64Target);
+  RegisterTargetMachine<PPC64TargetMachine> C(ThePPC64LETarget);
 }
 
 PPCTargetMachine::PPCTargetMachine(const Target &T, StringRef TT,

lib/Target/PowerPC/TargetInfo/PowerPCTargetInfo.cpp

@@ -12,7 +12,7 @@
 #include "llvm/Support/TargetRegistry.h"
 using namespace llvm;
 
-Target llvm::ThePPC32Target, llvm::ThePPC64Target;
+Target llvm::ThePPC32Target, llvm::ThePPC64Target, llvm::ThePPC64LETarget;
 
 extern "C" void LLVMInitializePowerPCTargetInfo() { 
   RegisterTarget<Triple::ppc, /*HasJIT=*/true>
@@ -20,4 +20,7 @@ extern "C" void LLVMInitializePowerPCTargetInfo() {
 
   RegisterTarget<Triple::ppc64, /*HasJIT=*/true>
     Y(ThePPC64Target, "ppc64", "PowerPC 64");
+
+  RegisterTarget<Triple::ppc64le, /*HasJIT=*/true>
+    Z(ThePPC64LETarget, "ppc64le", "PowerPC 64 LE");
 }

lib/Transforms/Instrumentation/AddressSanitizer.cpp

@@ -222,7 +222,8 @@ static ShadowMapping getShadowMapping(const Module &M, int LongSize,
   llvm::Triple TargetTriple(M.getTargetTriple());
   bool IsAndroid = TargetTriple.getEnvironment() == llvm::Triple::Android;
   bool IsMacOSX = TargetTriple.getOS() == llvm::Triple::MacOSX;
-  bool IsPPC64 = TargetTriple.getArch() == llvm::Triple::ppc64;
+  bool IsPPC64 = TargetTriple.getArch() == llvm::Triple::ppc64 ||
+                 TargetTriple.getArch() == llvm::Triple::ppc64le;
   bool IsX86_64 = TargetTriple.getArch() == llvm::Triple::x86_64;
   bool IsMIPS32 = TargetTriple.getArch() == llvm::Triple::mips ||
                   TargetTriple.getArch() == llvm::Triple::mipsel;

projects/sample/autoconf/config.guess

@@ -961,6 +961,9 @@ EOF
     ppc64:Linux:*:*)
 	echo powerpc64-unknown-linux-gnu
 	exit ;;
+    ppc64le:Linux:*:*)
+	echo powerpc64le-unknown-linux-gnu
+	exit ;;
     ppc:Linux:*:*)
 	echo powerpc-unknown-linux-gnu
 	exit ;;

projects/sample/autoconf/m4/libtool.m4

@@ -530,7 +530,7 @@ x86_64-*linux*|ppc*-*linux*|powerpc*-*linux*|s390*-*linux*|sparc*-*linux*)
         x86_64-*linux*)
           LD="${LD-ld} -m elf_i386"
           ;;
-        ppc64-*linux*|powerpc64-*linux*)
+        ppc64-*linux*|powerpc64-*linux*|ppc64le-$linux*|powerpc64le-*linux*)
           LD="${LD-ld} -m elf32ppclinux"
           ;;
         s390x-*linux*)