AMDGPU: Error on LDS global address in functions

These won't work as expected now, so error on them to avoid
wasting time debugging this in the future.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334269 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/AMDGPU/AMDGPUISelLowering.cpp

@@ -1272,7 +1272,15 @@ SDValue AMDGPUTargetLowering::LowerGlobalAddress(AMDGPUMachineFunction* MFI,
   GlobalAddressSDNode *G = cast<GlobalAddressSDNode>(Op);
   const GlobalValue *GV = G->getGlobal();
 
-  if  (G->getAddressSpace() == AMDGPUASI.LOCAL_ADDRESS) {
+  if (G->getAddressSpace() == AMDGPUASI.LOCAL_ADDRESS ||
+      G->getAddressSpace() == AMDGPUASI.REGION_ADDRESS) {
+    if (!MFI->isEntryFunction()) {
+      const Function &Fn = DAG.getMachineFunction().getFunction();
+      DiagnosticInfoUnsupported BadLDSDecl(
+        Fn, "local memory global used by non-kernel function", SDLoc(Op).getDebugLoc());
+      DAG.getContext()->diagnose(BadLDSDecl);
+    }
+
     // XXX: What does the value of G->getOffset() mean?
     assert(G->getOffset() == 0 &&
          "Do not know what to do with an non-zero offset");

test/CodeGen/AMDGPU/lds-global-non-entry-func.ll

@@ -0,0 +1,9 @@
+; RUN: not llc -mtriple=amdgcn-amd-amdhsa -o /dev/null %s 2>&1 | FileCheck %s
+
+@lds = internal addrspace(3) global float undef, align 4
+
+; CHECK: error: <unknown>:0:0: in function func_use_lds_global void (): local memory global used by non-kernel function
+define void @func_use_lds_global() {
+  store float 0.0, float addrspace(3)* @lds, align 4
+  ret void
+}