[OPENMP]Target region: emit const firstprivates as globals with constant

memory.

If the variable with the constant non-scalar type is firstprivatized in
the target region, the local copy is created with the data copying.
Instead, we allocate the copy in the constant memory and avoid extra
copying in the outlined target regions. This global copy is used in the
target regions without loss of the performance.

llvm-svn: 355418

1 files changed, 11 insertions, 1 deletions

diff --git a/clang/lib/CodeGen/CGOpenMPRuntime.h b/clang/lib/CodeGen/CGOpenMPRuntime.h
index cbac691d528..58a2358e754 100644
--- a/clang/lib/CodeGen/CGOpenMPRuntime.h
+++ b/clang/lib/CodeGen/CGOpenMPRuntime.h
@@ -708,7 +708,8 @@ private:
   /// must be the same.
   /// \param Name Name of the variable.
   llvm::Constant *getOrCreateInternalVariable(llvm::Type *Ty,
-                                              const llvm::Twine &Name);
+                                              const llvm::Twine &Name,
+                                              unsigned AddressSpace = 0);
 
   /// Set of threadprivate variables with the generated initializer.
   llvm::StringSet<> ThreadPrivateWithDefinition;
@@ -761,6 +762,10 @@ private:
                             llvm::Function *TaskFunction, QualType SharedsTy,
                             Address Shareds, const OMPTaskDataTy &Data);
 
+  /// Returns default address space for the constant firstprivates, 0 by
+  /// default.
+  virtual unsigned getDefaultFirstprivateAddressSpace() const { return 0; }
+
 public:
   explicit CGOpenMPRuntime(CodeGenModule &CGM)
       : CGOpenMPRuntime(CGM, ".", ".") {}
@@ -1414,6 +1419,11 @@ public:
   virtual void registerTargetGlobalVariable(const VarDecl *VD,
                                             llvm::Constant *Addr);
 
+  /// Registers provided target firstprivate variable as global on the
+  /// target.
+  llvm::Constant *registerTargetFirstprivateCopy(CodeGenFunction &CGF,
+                                                 const VarDecl *VD);
+
   /// Emit the global \a GD if it is meaningful for the target. Returns
   /// if it was emitted successfully.
   /// \param GD Global to scan.