[OpenMP] Codegen for target update directive.

Summary: This patch implements the code generation for the `target update` directive. The implemntation relies on the logic already in place for target data standalone directives, i.e. target enter/exit data.

Reviewers: hfinkel, carlo.bertolli, arpith-jacob, kkwli0, ABataev

Subscribers: caomhin, cfe-commits

Differential Revision: http://reviews.llvm.org/D20650

llvm-svn: 270886

1 files changed, 18 insertions, 5 deletions

diff --git a/clang/lib/CodeGen/CGStmtOpenMP.cpp b/clang/lib/CodeGen/CGStmtOpenMP.cpp
index e20ac0aebc0..2f4a2c7f7b6 100644
--- a/clang/lib/CodeGen/CGStmtOpenMP.cpp
+++ b/clang/lib/CodeGen/CGStmtOpenMP.cpp
@@ -3366,8 +3366,7 @@ void CodeGenFunction::EmitOMPTargetEnterDataDirective(
   if (auto *C = S.getSingleClause<OMPDeviceClause>())
     Device = C->getDevice();
 
-  CGM.getOpenMPRuntime().emitTargetEnterOrExitDataCall(*this, S, IfCond,
-                                                       Device);
+  CGM.getOpenMPRuntime().emitTargetDataStandAloneCall(*this, S, IfCond, Device);
 }
 
 void CodeGenFunction::EmitOMPTargetExitDataDirective(
@@ -3387,8 +3386,7 @@ void CodeGenFunction::EmitOMPTargetExitDataDirective(
   if (auto *C = S.getSingleClause<OMPDeviceClause>())
     Device = C->getDevice();
 
-  CGM.getOpenMPRuntime().emitTargetEnterOrExitDataCall(*this, S, IfCond,
-                                                       Device);
+  CGM.getOpenMPRuntime().emitTargetDataStandAloneCall(*this, S, IfCond, Device);
 }
 
 void CodeGenFunction::EmitOMPTargetParallelDirective(
@@ -3550,5 +3548,20 @@ void CodeGenFunction::EmitOMPTaskLoopSimdDirective(
 // Generate the instructions for '#pragma omp target update' directive.
 void CodeGenFunction::EmitOMPTargetUpdateDirective(
     const OMPTargetUpdateDirective &S) {
-  // TODO: codegen for target update
+  // If we don't have target devices, don't bother emitting the data mapping
+  // code.
+  if (CGM.getLangOpts().OMPTargetTriples.empty())
+    return;
+
+  // Check if we have any if clause associated with the directive.
+  const Expr *IfCond = nullptr;
+  if (auto *C = S.getSingleClause<OMPIfClause>())
+    IfCond = C->getCondition();
+
+  // Check if we have any device clause associated with the directive.
+  const Expr *Device = nullptr;
+  if (auto *C = S.getSingleClause<OMPDeviceClause>())
+    Device = C->getDevice();
+
+  CGM.getOpenMPRuntime().emitTargetDataStandAloneCall(*this, S, IfCond, Device);
 }