[OpenCL] Fix code generation of function-scope constant samplers.

Summary:
Constant samplers are handled as static variables and clang's code generation
library, which leads to llvm::unreachable. We bypass emitting sampler variable
as static since it's translated to a function call later.

Reviewers: yaxunl, Anastasia

Reviewed By: yaxunl, Anastasia

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D34342

llvm-svn: 318290

1 files changed, 4 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CGDecl.cpp b/clang/lib/CodeGen/CGDecl.cpp
index 44a6db4750f..e9f58cfac68 100644
--- a/clang/lib/CodeGen/CGDecl.cpp
+++ b/clang/lib/CodeGen/CGDecl.cpp
@@ -162,6 +162,10 @@ void CodeGenFunction::EmitVarDecl(const VarDecl &D) {
   // needs to be emitted like a static variable, e.g. a function-scope
   // variable in constant address space in OpenCL.
   if (D.getStorageDuration() != SD_Automatic) {
+    // Static sampler variables translated to function calls.
+    if (D.getType()->isSamplerT())
+      return;
+
     llvm::GlobalValue::LinkageTypes Linkage =
         CGM.getLLVMLinkageVarDefinition(&D, /*isConstant=*/false);