commit 8521ff6ec4138e9c88cb29d719a9115dabb670a9
author Alexey Bataev <a.bataev@hotmail.com> Wed Jul 25 20:03:01 2018 +0000
committer Alexey Bataev <a.bataev@hotmail.com> Wed Jul 25 20:03:01 2018 +0000
tree 225de136e511037d0e052a4485b2db95c0ee95e7
parent b6613ac665cfad86260a3ab61b8eb43c61c5a0fe

[OPENMP] ThreadId in serialized parallel regions is 0.

The first argument for the parallel outlined functions, called as
serialized parallel regions, should be a pointer to the global thread id
that always is 0.

llvm-svn: 337957

clang/lib/CodeGen/CGOpenMPRuntime.cpp

diff --git a/clang/lib/CodeGen/CGOpenMPRuntime.cpp b/clang/lib/CodeGen/CGOpenMPRuntime.cpp
index 478fda7..3730b9a 100644
--- a/clang/lib/CodeGen/CGOpenMPRuntime.cpp
+++ b/clang/lib/CodeGen/CGOpenMPRuntime.cpp
@@ -2839,12 +2839,12 @@
         RT.createRuntimeFunction(OMPRTL__kmpc_serialized_parallel), Args);
 
     // OutlinedFn(&GTid, &zero, CapturedStruct);
-    Address ThreadIDAddr = RT.emitThreadIDAddress(CGF, Loc);
     Address ZeroAddr = CGF.CreateDefaultAlignTempAlloca(CGF.Int32Ty,
                                                         /*Name*/ ".zero.addr");
     CGF.InitTempAlloca(ZeroAddr, CGF.Builder.getInt32(/*C*/ 0));
     llvm::SmallVector<llvm::Value *, 16> OutlinedFnArgs;
-    OutlinedFnArgs.push_back(ThreadIDAddr.getPointer());
+    // ThreadId for serialized parallels is 0.
+    OutlinedFnArgs.push_back(ZeroAddr.getPointer());
     OutlinedFnArgs.push_back(ZeroAddr.getPointer());
     OutlinedFnArgs.append(CapturedVars.begin(), CapturedVars.end());
     RT.emitOutlinedFunctionCall(CGF, Loc, OutlinedFn, OutlinedFnArgs);