1 files changed, 23 insertions, 5 deletions
diff --git a/lib/Target/X86/X86Subtarget.h b/lib/Target/X86/X86Subtarget.h
index 423e2cb743..c52979711d 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/GlobalValue.h"
 #include "llvm/Target/TargetSubtarget.h"
 
 #include <string>
@@ -64,7 +65,7 @@ public:
   enum {
     isELF, isCygwin, isDarwin, isWindows
   } TargetType;
-    
+
   /// This constructor initializes the data members to match that
   /// of the specified module.
   ///
@@ -80,8 +81,8 @@ public:
   /// instruction. This is only used if the src / dst alignment is not DWORD
   /// aligned.
   unsigned getMinRepStrSizeThreshold() const { return MinRepStrSizeThreshold; }
- 
-  /// ParseSubtargetFeatures - Parses features string setting specified 
+
+  /// ParseSubtargetFeatures - Parses features string setting specified
   /// subtarget options.  Definition of function is auto generated by tblgen.
   void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);
 
@@ -97,14 +98,31 @@ public:
   bool hasSSE3() const { return X86SSELevel >= SSE3; }
   bool has3DNow() const { return X863DNowLevel >= ThreeDNow; }
   bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; }
-  
+
   bool isFlavorAtt() const { return AsmFlavor == att; }
   bool isFlavorIntel() const { return AsmFlavor == intel; }
 
   bool isTargetDarwin() const { return TargetType == isDarwin; }
   bool isTargetELF() const { return TargetType == isELF; }
   bool isTargetWindows() const { return TargetType == isWindows; }
-  bool isTargetCygwin() const { return TargetType == isCygwin; }  
+  bool isTargetCygwin() const { return TargetType == isCygwin; }
+
+  /// True if accessing the GV requires an extra load. For Windows, dllimported
+  /// symbols are indirect, loading the value at address GV rather then the
+  /// value of GV itself. This means that the GlobalAddress must be in the base
+  /// or index register of the address, not the GV offset field.
+  bool GVRequiresExtraLoad(const GlobalValue* GV, bool isDirectCall) const
+  {
+    if (isTargetDarwin()) {
+      return (!isDirectCall &&
+              (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
+               (GV->isExternal() && !GV->hasNotBeenReadFromBytecode())));
+    } else if (isTargetCygwin() || isTargetWindows()) {
+      return (GV->hasDLLImportLinkage());
+    }
+
+    return false;
+  }
 };
 
 namespace X86 {