tra added inline comments.
================
Comment at: lib/CodeGen/CodeGenModule.cpp:2334
@@ -2339,1 +2333,3 @@
+ D->hasAttr<CUDASharedAttr>())
Init = llvm::UndefValue::get(getTypes().ConvertType(ASTTy));
+ else if (!InitExpr) {
----------------
rsmith wrote:
> As this is a global variable, it should presumably still be statically
> zero-initialized.
There is no way to initialize __shared__ variables. They are rough equivalent
of local variables, only in this case CUDA allocates them per kernel invocation
from a shared buffer with no guarantees regarding its contents.
They used to be zero-initialized by compiler, but that was intentionally
changed to undef in r245786 / http://reviews.llvm.org/D12241
http://reviews.llvm.org/D15305
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