[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 new test case variant ensures that correct built-in defines for
little-endian code are generated.

llvm-svn: 187180

7 files changed, 71 insertions, 8 deletions

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index 20e504c0be5..596eb8cb168 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -268,6 +268,7 @@ public:
     case llvm::Triple::mipsel:
     case llvm::Triple::ppc:
     case llvm::Triple::ppc64:
+    case llvm::Triple::ppc64le:
       this->MCountName = "_mcount";
       break;
     case llvm::Triple::arm:
@@ -631,6 +632,7 @@ class PPCTargetInfo : public TargetInfo {
   std::string CPU;
 public:
   PPCTargetInfo(const llvm::Triple &Triple) : TargetInfo(Triple) {
+    BigEndian = (Triple.getArch() != llvm::Triple::ppc64le);
     LongDoubleWidth = LongDoubleAlign = 128;
     LongDoubleFormat = &llvm::APFloat::PPCDoubleDouble;
   }
@@ -702,6 +704,8 @@ public:
       .Case("ppc", true)
       .Case("powerpc64", true)
       .Case("ppc64", true)
+      .Case("powerpc64le", true)
+      .Case("ppc64le", true)
       .Default(false);
 
     if (CPUKnown)
@@ -867,10 +871,15 @@ void PPCTargetInfo::getTargetDefines(const LangOptions &Opts,
   }
 
   // Target properties.
-  if (getTriple().getOS() != llvm::Triple::NetBSD &&
-      getTriple().getOS() != llvm::Triple::OpenBSD)
-    Builder.defineMacro("_BIG_ENDIAN");
-  Builder.defineMacro("__BIG_ENDIAN__");
+  if (getTriple().getArch() == llvm::Triple::ppc64le) {
+    Builder.defineMacro("_LITTLE_ENDIAN");
+    Builder.defineMacro("__LITTLE_ENDIAN__");
+  } else {
+    if (getTriple().getOS() != llvm::Triple::NetBSD &&
+        getTriple().getOS() != llvm::Triple::OpenBSD)
+      Builder.defineMacro("_BIG_ENDIAN");
+    Builder.defineMacro("__BIG_ENDIAN__");
+  }
 
   // Subtarget options.
   Builder.defineMacro("__NATURAL_ALIGNMENT__");
@@ -1006,6 +1015,7 @@ void PPCTargetInfo::getDefaultFeatures(llvm::StringMap<bool> &Features) const {
     .Case("pwr6", true)
     .Case("pwr7", true)
     .Case("ppc64", true)
+    .Case("ppc64le", true)
     .Default(false);
 
   Features["qpx"] = (CPU == "a2q");
@@ -1167,6 +1177,8 @@ public:
 };
 } // end anonymous namespace.
 
+// Note: ABI differences may eventually require us to have a separate
+// TargetInfo for little endian.
 namespace {
 class PPC64TargetInfo : public PPCTargetInfo {
 public:
@@ -2967,6 +2979,7 @@ public:
     case llvm::Triple::mipsel:
     case llvm::Triple::ppc:
     case llvm::Triple::ppc64:
+    case llvm::Triple::ppc64le:
       // this->MCountName = "_mcount";
       break;
     case llvm::Triple::arm:
@@ -5236,6 +5249,14 @@ static TargetInfo *AllocateTarget(const llvm::Triple &Triple) {
       return new PPC64TargetInfo(Triple);
     }
 
+  case llvm::Triple::ppc64le:
+    switch (os) {
+    case llvm::Triple::Linux:
+      return new LinuxTargetInfo<PPC64TargetInfo>(Triple);
+    default:
+      return new PPC64TargetInfo(Triple);
+    }
+
   case llvm::Triple::nvptx:
     return new NVPTX32TargetInfo(Triple);
   case llvm::Triple::nvptx64:
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 71664b8d3c0..5b41237585c 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -1590,6 +1590,7 @@ Value *CodeGenFunction::EmitTargetBuiltinExpr(unsigned BuiltinID,
     return EmitX86BuiltinExpr(BuiltinID, E);
   case llvm::Triple::ppc:
   case llvm::Triple::ppc64:
+  case llvm::Triple::ppc64le:
     return EmitPPCBuiltinExpr(BuiltinID, E);
   default:
     return 0;
diff --git a/clang/lib/CodeGen/TargetInfo.cpp b/clang/lib/CodeGen/TargetInfo.cpp
index 5934ff37193..3e7f7fedba6 100644
--- a/clang/lib/CodeGen/TargetInfo.cpp
+++ b/clang/lib/CodeGen/TargetInfo.cpp
@@ -5416,6 +5416,9 @@ const TargetCodeGenInfo &CodeGenModule::getTargetCodeGenInfo() {
       return *(TheTargetCodeGenInfo = new PPC64_SVR4_TargetCodeGenInfo(Types));
     else
       return *(TheTargetCodeGenInfo = new PPC64TargetCodeGenInfo(Types));
+  case llvm::Triple::ppc64le:
+    assert(Triple.isOSBinFormatELF() && "PPC64 LE non-ELF not supported!");
+    return *(TheTargetCodeGenInfo = new PPC64_SVR4_TargetCodeGenInfo(Types));
 
   case llvm::Triple::nvptx:
   case llvm::Triple::nvptx64:
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 91b6bc148f5..028ba623c4f 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -736,6 +736,10 @@ bool Driver::HandleImmediateArgs(const Compilation &C) {
     case llvm::Triple::ppc64:
       llvm::outs() << "ppc64;@m64" << "\n";
       break;
+
+    case llvm::Triple::ppc64le:
+      llvm::outs() << "ppc64le;@m64" << "\n";
+      break;
     }
     return false;
   }
@@ -758,6 +762,10 @@ bool Driver::HandleImmediateArgs(const Compilation &C) {
     case llvm::Triple::ppc64:
       llvm::outs() << "ppc64" << "\n";
       break;
+
+    case llvm::Triple::ppc64le:
+      llvm::outs() << "ppc64le" << "\n";
+      break;
     }
     return false;
   }
diff --git a/clang/lib/Driver/ToolChain.cpp b/clang/lib/Driver/ToolChain.cpp
index 8676f7f8df4..4fe35609767 100644
--- a/clang/lib/Driver/ToolChain.cpp
+++ b/clang/lib/Driver/ToolChain.cpp
@@ -52,6 +52,8 @@ std::string ToolChain::getDefaultUniversalArchName() const {
     return "ppc";
   case llvm::Triple::ppc64:
     return "ppc64";
+  case llvm::Triple::ppc64le:
+    return "ppc64le";
   default:
     return Triple.getArchName();
   }
diff --git a/clang/lib/Driver/ToolChains.cpp b/clang/lib/Driver/ToolChains.cpp
index 90851b49ad0..090181b4826 100644
--- a/clang/lib/Driver/ToolChains.cpp
+++ b/clang/lib/Driver/ToolChains.cpp
@@ -752,7 +752,7 @@ DerivedArgList *Darwin::TranslateArgs(const DerivedArgList &Args,
     else if (Name == "ppc970")
       DAL->AddJoinedArg(0, MCpu, "970");
 
-    else if (Name == "ppc64")
+    else if (Name == "ppc64" || Name == "ppc64le")
       DAL->AddFlagArg(0, Opts.getOption(options::OPT_m64));
 
     else if (Name == "i386")
@@ -1104,6 +1104,11 @@ Generic_GCC::GCCInstallationDetector::GCCInstallationDetector(
                                               "powerpc64-unknown-linux-gnu",
                                               "powerpc64-suse-linux",
                                               "ppc64-redhat-linux" };
+  static const char *const PPC64LELibDirs[] = { "/lib64", "/lib" };
+  static const char *const PPC64LETriples[] = { "powerpc64le-linux-gnu",
+                                                "powerpc64le-unknown-linux-gnu",
+                                                "powerpc64le-suse-linux",
+                                                "ppc64le-redhat-linux" };
 
   static const char *const SystemZLibDirs[] = { "/lib64", "/lib" };
   static const char *const SystemZTriples[] = {
@@ -1214,6 +1219,12 @@ Generic_GCC::GCCInstallationDetector::GCCInstallationDetector(
     BiarchTripleAliases.append(PPCTriples,
                                PPCTriples + llvm::array_lengthof(PPCTriples));
     break;
+  case llvm::Triple::ppc64le:
+    LibDirs.append(PPC64LELibDirs,
+                   PPC64LELibDirs + llvm::array_lengthof(PPC64LELibDirs));
+    TripleAliases.append(PPC64LETriples,
+                         PPC64LETriples + llvm::array_lengthof(PPC64LETriples));
+    break;
   case llvm::Triple::systemz:
     LibDirs.append(SystemZLibDirs,
                    SystemZLibDirs + llvm::array_lengthof(SystemZLibDirs));
@@ -2124,6 +2135,9 @@ static std::string getMultiarchTriple(const llvm::Triple TargetTriple,
   case llvm::Triple::ppc64:
     if (llvm::sys::fs::exists(SysRoot + "/lib/powerpc64-linux-gnu"))
       return "powerpc64-linux-gnu";
+  case llvm::Triple::ppc64le:
+    if (llvm::sys::fs::exists(SysRoot + "/lib/powerpc64le-linux-gnu"))
+      return "powerpc64le-linux-gnu";
     return TargetTriple.str();
   }
 }
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 82bd872df84..eb3c4f8569e 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -550,6 +550,7 @@ static bool isSignedCharDefault(const llvm::Triple &Triple) {
       return true;
     return false;
 
+  case llvm::Triple::ppc64le:
   case llvm::Triple::systemz:
     return false;
   }
@@ -1109,6 +1110,7 @@ static std::string getPPCTargetCPU(const ArgList &Args) {
       .Case("pwr7", "pwr7")
       .Case("powerpc", "ppc")
       .Case("powerpc64", "ppc64")
+      .Case("powerpc64le", "ppc64le")
       .Default("");
   }
 
@@ -1126,6 +1128,8 @@ void Clang::AddPPCTargetArgs(const ArgList &Args,
   if (TargetCPUName.empty() && !Triple.isOSDarwin()) {
     if (Triple.getArch() == llvm::Triple::ppc64)
       TargetCPUName = "ppc64";
+    else if (Triple.getArch() == llvm::Triple::ppc64le)
+      TargetCPUName = "ppc64le";
     else
       TargetCPUName = "ppc";
   }
@@ -2470,6 +2474,7 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
 
   case llvm::Triple::ppc:
   case llvm::Triple::ppc64:
+  case llvm::Triple::ppc64le:
     AddPPCTargetArgs(Args, CmdArgs);
     break;
 
@@ -2913,9 +2918,10 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   // Report an error for -faltivec on anything other than PowerPC.
   if (const Arg *A = Args.getLastArg(options::OPT_faltivec))
     if (!(getToolChain().getArch() == llvm::Triple::ppc ||
-          getToolChain().getArch() == llvm::Triple::ppc64))
+          getToolChain().getArch() == llvm::Triple::ppc64 ||
+          getToolChain().getArch() == llvm::Triple::ppc64le))
       D.Diag(diag::err_drv_argument_only_allowed_with)
-        << A->getAsString(Args) << "ppc/ppc64";
+        << A->getAsString(Args) << "ppc/ppc64/ppc64le";
 
   if (getToolChain().SupportsProfiling())
     Args.AddLastArg(CmdArgs, options::OPT_pg);
@@ -3949,6 +3955,8 @@ void gcc::Common::ConstructJob(Compilation &C, const JobAction &JA,
       CmdArgs.push_back("ppc");
     else if (Arch == llvm::Triple::ppc64)
       CmdArgs.push_back("ppc64");
+    else if (Arch == llvm::Triple::ppc64le)
+      CmdArgs.push_back("ppc64le");
     else
       CmdArgs.push_back(Args.MakeArgString(getToolChain().getArchName()));
   }
@@ -3960,7 +3968,8 @@ void gcc::Common::ConstructJob(Compilation &C, const JobAction &JA,
   // here.
   if (Arch == llvm::Triple::x86 || Arch == llvm::Triple::ppc)
     CmdArgs.push_back("-m32");
-  else if (Arch == llvm::Triple::x86_64 || Arch == llvm::Triple::ppc64)
+  else if (Arch == llvm::Triple::x86_64 || Arch == llvm::Triple::ppc64 ||
+           Arch == llvm::Triple::ppc64le)
     CmdArgs.push_back("-m64");
 
   if (Output.isFilename()) {
@@ -5912,6 +5921,10 @@ void gnutools::Assemble::ConstructJob(Compilation &C, const JobAction &JA,
     CmdArgs.push_back("-a64");
     CmdArgs.push_back("-mppc64");
     CmdArgs.push_back("-many");
+  } else if (getToolChain().getArch() == llvm::Triple::ppc64le) {
+    CmdArgs.push_back("-a64");
+    CmdArgs.push_back("-mppc64le");
+    CmdArgs.push_back("-many");
   } else if (getToolChain().getArch() == llvm::Triple::arm) {
     StringRef MArch = getToolChain().getArchName();
     if (MArch == "armv7" || MArch == "armv7a" || MArch == "armv7-a")
@@ -6057,6 +6070,7 @@ static StringRef getLinuxDynamicLinker(const ArgList &Args,
   } else if (ToolChain.getArch() == llvm::Triple::ppc)
     return "/lib/ld.so.1";
   else if (ToolChain.getArch() == llvm::Triple::ppc64 ||
+           ToolChain.getArch() == llvm::Triple::ppc64le ||
            ToolChain.getArch() == llvm::Triple::systemz)
     return "/lib64/ld64.so.1";
   else