Add SystemZ support

This patch then adds all the usual platform-specific pieces for SystemZ:
driver support, basic target info, register names and constraints,
ABI info and vararg support.  It also adds new tests to verify pre-defined
macros and inline asm, and updates a test for the minimum alignment change.

This version of the patch incorporates feedback from reviews by
Eric Christopher and John McCall.  Thanks to all reviewers!

Patch by Richard Sandiford.

llvm-svn: 181211

1 files changed, 102 insertions, 0 deletions

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index cabdffa68c2..96b12bac1f1 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -4315,6 +4315,100 @@ public:
 } // end anonymous namespace.
 
 namespace {
+  class SystemZTargetInfo : public TargetInfo {
+    static const char *const GCCRegNames[];
+
+  public:
+    SystemZTargetInfo(const std::string& triple) : TargetInfo(triple) {
+      TLSSupported = true;
+      IntWidth = IntAlign = 32;
+      LongWidth = LongLongWidth = LongAlign = LongLongAlign = 64;
+      PointerWidth = PointerAlign = 64;
+      LongDoubleWidth = 128;
+      LongDoubleAlign = 64;
+      LongDoubleFormat = &llvm::APFloat::IEEEquad;
+      MinGlobalAlign = 16;
+      DescriptionString = "E-p:64:64:64-i1:8:16-i8:8:16-i16:16-i32:32-i64:64"
+       "-f32:32-f64:64-f128:64-a0:8:16-n32:64";
+      MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 64;
+    }
+    virtual void getTargetDefines(const LangOptions &Opts,
+                                  MacroBuilder &Builder) const {
+      Builder.defineMacro("__s390__");
+      Builder.defineMacro("__s390x__");
+      Builder.defineMacro("__zarch__");
+      Builder.defineMacro("__LONG_DOUBLE_128__");
+    }
+    virtual void getTargetBuiltins(const Builtin::Info *&Records,
+                                   unsigned &NumRecords) const {
+      // FIXME: Implement.
+      Records = 0;
+      NumRecords = 0;
+    }
+
+    virtual void getGCCRegNames(const char *const *&Names,
+                                unsigned &NumNames) const;
+    virtual void getGCCRegAliases(const GCCRegAlias *&Aliases,
+                                  unsigned &NumAliases) const {
+      // No aliases.
+      Aliases = 0;
+      NumAliases = 0;
+    }
+    virtual bool validateAsmConstraint(const char *&Name,
+                                       TargetInfo::ConstraintInfo &info) const;
+    virtual const char *getClobbers() const {
+      // FIXME: Is this really right?
+      return "";
+    }
+    virtual BuiltinVaListKind getBuiltinVaListKind() const {
+      return TargetInfo::SystemZBuiltinVaList;
+    }
+  };
+
+  const char *const SystemZTargetInfo::GCCRegNames[] = {
+    "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
+    "r8",  "r9",  "r10", "r11", "r12", "r13", "r14", "r15",
+    "f0",  "f2",  "f4",  "f6",  "f1",  "f3",  "f5",  "f7",
+    "f8",  "f10", "f12", "f14", "f9",  "f11", "f13", "f15"
+  };
+
+  void SystemZTargetInfo::getGCCRegNames(const char *const *&Names,
+                                         unsigned &NumNames) const {
+    Names = GCCRegNames;
+    NumNames = llvm::array_lengthof(GCCRegNames);
+  }
+
+  bool SystemZTargetInfo::
+  validateAsmConstraint(const char *&Name,
+                        TargetInfo::ConstraintInfo &Info) const {
+    switch (*Name) {
+    default:
+      return false;
+
+    case 'a': // Address register
+    case 'd': // Data register (equivalent to 'r')
+    case 'f': // Floating-point register
+      Info.setAllowsRegister();
+      return true;
+
+    case 'I': // Unsigned 8-bit constant
+    case 'J': // Unsigned 12-bit constant
+    case 'K': // Signed 16-bit constant
+    case 'L': // Signed 20-bit displacement (on all targets we support)
+    case 'M': // 0x7fffffff
+      return true;
+
+    case 'Q': // Memory with base and unsigned 12-bit displacement
+    case 'R': // Likewise, plus an index
+    case 'S': // Memory with base and signed 20-bit displacement
+    case 'T': // Likewise, plus an index
+      Info.setAllowsMemory();
+      return true;
+    }
+  }
+}
+
+namespace {
   class MSP430TargetInfo : public TargetInfo {
     static const char * const GCCRegNames[];
   public:
@@ -5281,6 +5375,14 @@ static TargetInfo *AllocateTarget(const std::string &T) {
       return new SparcV9TargetInfo(T);
     }
 
+  case llvm::Triple::systemz:
+    switch (os) {
+    case llvm::Triple::Linux:
+      return new LinuxTargetInfo<SystemZTargetInfo>(T);
+    default:
+      return new SystemZTargetInfo(T);
+    }
+
   case llvm::Triple::tce:
     return new TCETargetInfo(T);