Index: lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp
===================================================================
--- lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp
+++ lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp
@@ -70,6 +70,11 @@
   cl::desc("Disable promote alloca to vector"),
   cl::init(false));
 
+static cl::opt<bool> DisablePromoteAllocaToLDS(
+  "disable-promote-alloca-to-lds",
+  cl::desc("Disable promote alloca to LDS"),
+  cl::init(false));
+
 // FIXME: This can create globals so should be a module pass.
 class AMDGPUPromoteAlloca : public FunctionPass {
 private:
@@ -706,6 +711,9 @@
   if (tryPromoteAllocaToVector(&I))
     return true; // Promoted to vector.
 
+  if (DisablePromoteAllocaToLDS)
+    return false;
+
   const Function &ContainingFunction = *I.getParent()->getParent();
   CallingConv::ID CC = ContainingFunction.getCallingConv();