Have the X86 backend use Triple instead of a string and some enums.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107625 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 38 insertions, 64 deletions

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 1671760472..423a076e7d 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -62,21 +62,19 @@ static SDValue getMOVL(SelectionDAG &DAG, DebugLoc dl, EVT VT, SDValue V1,
                        SDValue V2);
 
 static TargetLoweringObjectFile *createTLOF(X86TargetMachine &TM) {
-  switch (TM.getSubtarget<X86Subtarget>().TargetType) {
-  default: llvm_unreachable("unknown subtarget type");
-  case X86Subtarget::isDarwin:
-    if (TM.getSubtarget<X86Subtarget>().is64Bit())
-      return new X8664_MachoTargetObjectFile();
+  
+  bool is64Bit = TM.getSubtarget<X86Subtarget>().is64Bit();
+  
+  if (TM.getSubtarget<X86Subtarget>().isTargetDarwin()) {
+    if (is64Bit) return new X8664_MachoTargetObjectFile();
     return new TargetLoweringObjectFileMachO();
-  case X86Subtarget::isELF:
-   if (TM.getSubtarget<X86Subtarget>().is64Bit())
-     return new X8664_ELFTargetObjectFile(TM);
+  } else if (TM.getSubtarget<X86Subtarget>().isTargetELF() ){
+    if (is64Bit) return new X8664_ELFTargetObjectFile(TM);
     return new X8632_ELFTargetObjectFile(TM);
-  case X86Subtarget::isMingw:
-  case X86Subtarget::isCygwin:
-  case X86Subtarget::isWindows:
+  } else if (TM.getSubtarget<X86Subtarget>().isTargetCOFF()) {
     return new TargetLoweringObjectFileCOFF();
-  }
+  }  
+  llvm_unreachable("unknown subtarget type");
 }
 
 X86TargetLowering::X86TargetLowering(X86TargetMachine &TM)
diff --git a/lib/Target/X86/X86Subtarget.cpp b/lib/Target/X86/X86Subtarget.cpp
index 6eda20dd0c..4a10be518f 100644
--- a/lib/Target/X86/X86Subtarget.cpp
+++ b/lib/Target/X86/X86Subtarget.cpp
@@ -296,12 +296,11 @@ X86Subtarget::X86Subtarget(const std::string &TT, const std::string &FS,
   , IsBTMemSlow(false)
   , IsUAMemFast(false)
   , HasVectorUAMem(false)
-  , DarwinVers(0)
   , stackAlignment(8)
   // FIXME: this is a known good value for Yonah. How about others?
   , MaxInlineSizeThreshold(128)
-  , Is64Bit(is64Bit)
-  , TargetType(isELF) { // Default to ELF unless otherwise specified.
+  , TargetTriple(TT)
+  , Is64Bit(is64Bit) {
 
   // default to hard float ABI
   if (FloatABIType == FloatABI::Default)
@@ -331,45 +330,15 @@ X86Subtarget::X86Subtarget(const std::string &TT, const std::string &FS,
     HasCMov = true;
   }
     
-
   DEBUG(dbgs() << "Subtarget features: SSELevel " << X86SSELevel
                << ", 3DNowLevel " << X863DNowLevel
                << ", 64bit " << HasX86_64 << "\n");
   assert((!Is64Bit || HasX86_64) &&
          "64-bit code requested on a subtarget that doesn't support it!");
 
-  // Set the boolean corresponding to the current target triple, or the default
-  // if one cannot be determined, to true.
-  if (TT.length() > 5) {
-    size_t Pos;
-    if ((Pos = TT.find("-darwin")) != std::string::npos) {
-      TargetType = isDarwin;
-      
-      // Compute the darwin version number.
-      if (isdigit(TT[Pos+7]))
-        DarwinVers = atoi(&TT[Pos+7]);
-      else
-        DarwinVers = 8;  // Minimum supported darwin is Tiger.
-    } else if (TT.find("linux") != std::string::npos) {
-      // Linux doesn't imply ELF, but we don't currently support anything else.
-      TargetType = isELF;
-    } else if (TT.find("cygwin") != std::string::npos) {
-      TargetType = isCygwin;
-    } else if (TT.find("mingw") != std::string::npos) {
-      TargetType = isMingw;
-    } else if (TT.find("win32") != std::string::npos) {
-      TargetType = isWindows;
-    } else if (TT.find("windows") != std::string::npos) {
-      TargetType = isWindows;
-    } else if (TT.find("-cl") != std::string::npos) {
-      TargetType = isDarwin;
-      DarwinVers = 9;
-    }
-  }
-
   // Stack alignment is 16 bytes on Darwin (both 32 and 64 bit) and for all 64
   // bit targets.
-  if (TargetType == isDarwin || Is64Bit)
+  if (isTargetDarwin() || Is64Bit)
     stackAlignment = 16;
 
   if (StackAlignment)
diff --git a/lib/Target/X86/X86Subtarget.h b/lib/Target/X86/X86Subtarget.h
index 8ad55b159d..486dbc4e2e 100644
--- a/lib/Target/X86/X86Subtarget.h
+++ b/lib/Target/X86/X86Subtarget.h
@@ -14,6 +14,7 @@
 #ifndef X86SUBTARGET_H
 #define X86SUBTARGET_H
 
+#include "llvm/ADT/Triple.h"
 #include "llvm/Target/TargetSubtarget.h"
 #include "llvm/CallingConv.h"
 #include <string>
@@ -89,10 +90,6 @@ protected:
   /// operands. This may require setting a feature bit in the processor.
   bool HasVectorUAMem;
 
-  /// DarwinVers - Nonzero if this is a darwin platform: the numeric
-  /// version of the platform, e.g. 8 = 10.4 (Tiger), 9 = 10.5 (Leopard), etc.
-  unsigned char DarwinVers; // Is any darwin-x86 platform.
-
   /// stackAlignment - The minimum alignment known to hold of the stack frame on
   /// entry to the function and which must be maintained by every function.
   unsigned stackAlignment;
@@ -100,6 +97,9 @@ protected:
   /// Max. memset / memcpy size that is turned into rep/movs, rep/stos ops.
   ///
   unsigned MaxInlineSizeThreshold;
+  
+  /// TargetTriple - What processor and OS we're targeting.
+  Triple TargetTriple;
 
 private:
   /// Is64Bit - True if the processor supports 64-bit instructions and
@@ -107,9 +107,6 @@ private:
   bool Is64Bit;
 
 public:
-  enum {
-    isELF, isCygwin, isDarwin, isWindows, isMingw
-  } TargetType;
 
   /// This constructor initializes the data members to match that
   /// of the specified triple.
@@ -158,24 +155,31 @@ public:
   bool isUnalignedMemAccessFast() const { return IsUAMemFast; }
   bool hasVectorUAMem() const { return HasVectorUAMem; }
 
-  bool isTargetDarwin() const { return TargetType == isDarwin; }
-  bool isTargetELF() const { return TargetType == isELF; }
+  bool isTargetDarwin() const { return TargetTriple.getOS() == Triple::Darwin; }
+  
+  // ELF is a reasonably sane default and the only other X86 targets we
+  // support are Darwin and Windows. Just use "not those".
+  bool isTargetELF() const { 
+    return !isTargetDarwin() && !isTargetWindows() && !isTargetCygMing();
+  }
+  bool isTargetLinux() const { return TargetTriple.getOS() == Triple::Linux; }
 
-  bool isTargetWindows() const { return TargetType == isWindows; }
-  bool isTargetMingw() const { return TargetType == isMingw; }
-  bool isTargetCygwin() const { return TargetType == isCygwin; }
+  bool isTargetWindows() const { return TargetTriple.getOS() == Triple::Win32; }
+  bool isTargetMingw() const { 
+    return TargetTriple.getOS() == Triple::MinGW32 ||
+           TargetTriple.getOS() == Triple::MinGW64; }
+  bool isTargetCygwin() const { return TargetTriple.getOS() == Triple::Cygwin; }
   bool isTargetCygMing() const {
-    return TargetType == isMingw || TargetType == isCygwin;
+    return isTargetMingw() || isTargetCygwin();
   }
-
+  
   /// isTargetCOFF - Return true if this is any COFF/Windows target variant.
   bool isTargetCOFF() const {
-    return TargetType == isMingw || TargetType == isCygwin ||
-           TargetType == isWindows;
+    return isTargetMingw() || isTargetCygwin() || isTargetWindows();
   }
 
   bool isTargetWin64() const {
-    return Is64Bit && (TargetType == isMingw || TargetType == isWindows);
+    return Is64Bit && (isTargetMingw() || isTargetWindows());
   }
 
   std::string getDataLayout() const {
@@ -209,7 +213,10 @@ public:
 
   /// getDarwinVers - Return the darwin version number, 8 = Tiger, 9 = Leopard,
   /// 10 = Snow Leopard, etc.
-  unsigned getDarwinVers() const { return DarwinVers; }
+  unsigned getDarwinVers() const {
+    if (isTargetDarwin()) return TargetTriple.getDarwinMajorNumber();
+    return 0;
+  }
 
   /// ClassifyGlobalReference - Classify a global variable reference for the
   /// current subtarget according to how we should reference it in a non-pcrel