Index: lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
===================================================================
--- lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
+++ lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
@@ -52,7 +52,7 @@
                                      cl::Hidden);
 
 static cl::opt<bool> EnableNarrowLdMerge("enable-narrow-ld-merge", cl::Hidden,
-                                         cl::init(true),
+                                         cl::init(false),
                                          cl::desc("Enable narrow load merge"));
 
 namespace llvm {
Index: test/CodeGen/AArch64/arm64-narrow-ldst-merge.ll
===================================================================
--- test/CodeGen/AArch64/arm64-narrow-ldst-merge.ll
+++ test/CodeGen/AArch64/arm64-narrow-ldst-merge.ll
@@ -1,6 +1,6 @@
-; RUN: llc < %s -mtriple aarch64--none-eabi -mcpu=cortex-a57 -verify-machineinstrs | FileCheck %s --check-prefix=CHECK --check-prefix=LE
-; RUN: llc < %s -mtriple aarch64_be--none-eabi -mcpu=cortex-a57 -verify-machineinstrs | FileCheck %s --check-prefix=CHECK --check-prefix=BE
-; RUN: llc < %s -mtriple aarch64--none-eabi -mcpu=kryo -verify-machineinstrs | FileCheck %s --check-prefix=CHECK --check-prefix=LE
+; RUN: llc < %s -mtriple aarch64--none-eabi -mcpu=cortex-a57 -verify-machineinstrs -enable-narrow-ld-merge=true | FileCheck %s --check-prefix=CHECK --check-prefix=LE
+; RUN: llc < %s -mtriple aarch64_be--none-eabi -mcpu=cortex-a57 -verify-machineinstrs -enable-narrow-ld-merge=true | FileCheck %s --check-prefix=CHECK --check-prefix=BE
+; RUN: llc < %s -mtriple aarch64--none-eabi -mcpu=kryo -verify-machineinstrs -enable-narrow-ld-merge=true | FileCheck %s --check-prefix=CHECK --check-prefix=LE
 
 ; CHECK-LABEL: Ldrh_merge
 ; CHECK-NOT: ldrh