diff --git a/llvm/lib/Transforms/Scalar/SROA.cpp b/llvm/lib/Transforms/Scalar/SROA.cpp
--- a/llvm/lib/Transforms/Scalar/SROA.cpp
+++ b/llvm/lib/Transforms/Scalar/SROA.cpp
@@ -121,6 +121,14 @@
 /// Disable running mem2reg during SROA in order to test or debug SROA.
 static cl::opt<bool> SROASkipMem2Reg("sroa-skip-mem2reg", cl::init(false),
                                      cl::Hidden);
+
+/// The maximum number of alloca slices allowed when splitting.
+static cl::opt<int>
+    SROAMaxAllocaSlices("sroa-max-alloca-slices", cl::init(32),
+                        cl::desc("Maximum number of alloca slices allowed "
+                                 "after which splitting is not attempted"),
+                        cl::Hidden);
+
 namespace {
 
 /// Calculate the fragment of a variable to use when slicing a store
@@ -4961,6 +4969,9 @@
   if (AS.isEscaped())
     return {Changed, CFGChanged};
 
+  if (std::distance(AS.begin(), AS.end()) > SROAMaxAllocaSlices)
+    return {Changed, CFGChanged};
+
   // Delete all the dead users of this alloca before splitting and rewriting it.
   for (Instruction *DeadUser : AS.getDeadUsers()) {
     // Free up everything used by this instruction.