Index: lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp
===================================================================
--- lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp
+++ lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp
@@ -285,9 +285,9 @@
   return CI;
 }
 
-static VectorType *arrayTypeToVecType(Type *ArrayTy) {
-  return VectorType::get(ArrayTy->getArrayElementType(),
-                         ArrayTy->getArrayNumElements());
+static VectorType *arrayTypeToVecType(ArrayType *ArrayTy) {
+  return VectorType::get(ArrayTy->getElementType(),
+                         ArrayTy->getNumElements());
 }
 
 static Value *
@@ -346,10 +346,9 @@
   // FIXME: We also reject alloca's of the form [ 2 x [ 2 x i32 ]] or equivalent. Potentially these
   // could also be promoted but we don't currently handle this case
   if (!AllocaTy ||
-      AllocaTy->getElementType()->isVectorTy() ||
-      AllocaTy->getElementType()->isArrayTy() ||
       AllocaTy->getNumElements() > 4 ||
-      AllocaTy->getNumElements() < 2) {
+      AllocaTy->getNumElements() < 2 ||
+      !VectorType::isValidElementType(AllocaTy->getElementType())) {
     DEBUG(dbgs() << "  Cannot convert type to vector\n");
     return false;
   }
Index: test/CodeGen/AMDGPU/promote-alloca-array-aggregate.ll
===================================================================
--- test/CodeGen/AMDGPU/promote-alloca-array-aggregate.ll
+++ test/CodeGen/AMDGPU/promote-alloca-array-aggregate.ll
@@ -11,6 +11,7 @@
 
 %Block = type { [1 x float], i32 }
 %gl_PerVertex = type { <4 x float>, float, [1 x float], [1 x float] }
+%struct = type { i32, i32 }
 
 @block = external addrspace(1) global %Block
 @pv = external addrspace(1) global %gl_PerVertex
@@ -129,3 +130,11 @@
   store <4 x float> %tmp21, <4 x float> addrspace(1)* @frag_color
   ret void
 }
+
+; Don't crash on a type that isn't a valid vector element.
+; OPT-LABEL: @alloca_struct(
+define amdgpu_kernel void @alloca_struct() #0 {
+entry:
+  %alloca = alloca [2 x %struct], align 4
+  ret void
+}