Index: llvm/lib/Analysis/InlineCost.cpp
===================================================================
--- llvm/lib/Analysis/InlineCost.cpp
+++ llvm/lib/Analysis/InlineCost.cpp
@@ -852,6 +852,10 @@
 }
 
 bool CallAnalyzer::visitAlloca(AllocaInst &I) {
+  // FIXME: Support scalable vector types.
+  if (isa<ScalableVectorType>(I.getAllocatedType()))
+    return false;
+
   // Check whether inlining will turn a dynamic alloca into a static
   // alloca and handle that case.
   if (I.isArrayAllocation()) {
Index: llvm/test/Transforms/Inline/inline-scalable.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/Inline/inline-scalable.ll
@@ -0,0 +1,12 @@
+; RUN: opt -S -inline < %s | FileCheck %s
+
+; Test we bail out for scalable vectors.
+define void @func() {
+; CHECK-LABEL: func
+; CHECK-NEXT:    [[VEC_ADDR:%.*]] = alloca <vscale x 4 x i32>
+; CHECK-NEXT:    call void @func()
+; CHECK-NEXT:    ret void
+  %vec.addr = alloca <vscale x 4 x i32>
+  call void @func();
+  ret void
+}