yaxunl added inline comments.

================
Comment at: lib/CodeGen/CGBlocks.cpp:726
+                                   CGM.getNSConcreteStackBlock()->getType()),
+                               QualType());
   isa = llvm::ConstantExpr::getBitCast(isa, VoidPtrTy);
----------------
The QualType needs to be the real QualType corresponding to the LLVM type, 
otherwise it won't work on targets with non-zero null pointer.


================
Comment at: lib/CodeGen/CGBlocks.cpp:1129
+                                   CGM.getNSConcreteGlobalBlock()->getType()),
+                               QualType()));
 
----------------
same issue as above.


================
Comment at: test/CodeGenOpenCL/cl20-device-side-enqueue.cl:3
 // RUN: %clang_cc1 %s -cl-std=CL2.0 -ffake-address-space-map -O0 -emit-llvm -o 
- -triple "spir64-unknown-unknown" | FileCheck %s --check-prefix=COMMON 
--check-prefix=B64
 
 typedef void (^bl_t)(local void *);
----------------
Can we add a run line for triple amdgcn-amd-amdhsa-opencl to make sure the null 
pointer is generated correctly?


https://reviews.llvm.org/D28814



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