diff --git a/lib/Target/ARM/ARMLoadStoreOptimizer.cpp b/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
index e4e683c2a02..c8ed5760f93 100644
--- a/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
+++ b/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
@@ -1258,6 +1258,22 @@ bool ARMLoadStoreOpt::LoadStoreMultipleOpti(MachineBasicBlock &MBB) {
       // merge the ldr's so far, including this one. But don't try to
       // combine the following ldr(s).
       Clobber = (isi32Load(Opcode) && Base == MBBI->getOperand(0).getReg());
+
+      // Watch out for:
+      // r4 := ldr [r0, #8]
+      // r4 := ldr [r0, #4]
+      //
+      // The optimization may reorder the second ldr in front of the first
+      // ldr, which violates write after write(WAW) dependence. The same as
+      // str. Try to merge inst(s) already in MemOps.
+      bool Overlap = false;
+      for (MemOpQueueIter I = MemOps.begin(), E = MemOps.end(); I != E; ++I) {
+        if (TRI->regsOverlap(Reg, I->MBBI->getOperand(0).getReg())) {
+          Overlap = true;
+          break;
+        }
+      }
+
       if (CurrBase == 0 && !Clobber) {
         // Start of a new chain.
         CurrBase = Base;
@@ -1268,7 +1284,7 @@ bool ARMLoadStoreOpt::LoadStoreMultipleOpti(MachineBasicBlock &MBB) {
         MemOps.push_back(MemOpQueueEntry(Offset, Reg, isKill, Position, MBBI));
         ++NumMemOps;
         Advance = true;
-      } else {
+      } else if (!Overlap) {
         if (Clobber) {
           TryMerge = true;
           Advance = true;
diff --git a/test/CodeGen/ARM/2013-04-18-load-overlap-PR14824.ll b/test/CodeGen/ARM/2013-04-18-load-overlap-PR14824.ll
new file mode 100644
index 00000000000..45999281874
--- /dev/null
+++ b/test/CodeGen/ARM/2013-04-18-load-overlap-PR14824.ll
@@ -0,0 +1,82 @@
+; RUN: llc < %s -mtriple=thumbv7-none-linux-gnueabi -mcpu=cortex-a9 -mattr=+neon,+neonfp | FileCheck %s
+; PR14824. The test is presented by Jiangning Liu. If the ld/st optimization algorithm is changed, this test case may fail.
+; Also if the machine code for ld/st optimizor is changed, this test case may fail. If so, remove this test.
+
+define void @sample_test(<8 x i64> * %secondSource, <8 x i64> * %source, <8 x i64> * %dest) nounwind {
+; CHECK: sample_test
+; CHECK-NOT: vldmia
+; CHECK: add
+entry:
+
+; Load %source
+  %s0 = load <8 x i64> * %source, align 64
+  %arrayidx64 = getelementptr inbounds <8 x i64> * %source, i32 6
+  %s120 = load <8 x i64> * %arrayidx64, align 64
+  %s122 = bitcast <8 x i64> %s120 to i512
+  %data.i.i677.48.extract.shift = lshr i512 %s122, 384
+  %data.i.i677.48.extract.trunc = trunc i512 %data.i.i677.48.extract.shift to i64
+  %s123 = insertelement <8 x i64> undef, i64 %data.i.i677.48.extract.trunc, i32 0
+  %data.i.i677.32.extract.shift = lshr i512 %s122, 256
+  %data.i.i677.32.extract.trunc = trunc i512 %data.i.i677.32.extract.shift to i64
+  %s124 = insertelement <8 x i64> %s123, i64 %data.i.i677.32.extract.trunc, i32 1
+  %data.i.i677.16.extract.shift = lshr i512 %s122, 128
+  %data.i.i677.16.extract.trunc = trunc i512 %data.i.i677.16.extract.shift to i64
+  %s125 = insertelement <8 x i64> %s124, i64 %data.i.i677.16.extract.trunc, i32 2
+  %data.i.i677.56.extract.shift = lshr i512 %s122, 448
+  %data.i.i677.56.extract.trunc = trunc i512 %data.i.i677.56.extract.shift to i64
+  %s126 = insertelement <8 x i64> %s125, i64 %data.i.i677.56.extract.trunc, i32 3
+  %data.i.i677.24.extract.shift = lshr i512 %s122, 192
+  %data.i.i677.24.extract.trunc = trunc i512 %data.i.i677.24.extract.shift to i64
+  %s127 = insertelement <8 x i64> %s126, i64 %data.i.i677.24.extract.trunc, i32 4
+  %s128 = insertelement <8 x i64> %s127, i64 %data.i.i677.32.extract.trunc, i32 5
+  %s129 = insertelement <8 x i64> %s128, i64 %data.i.i677.16.extract.trunc, i32 6
+  %s130 = insertelement <8 x i64> %s129, i64 %data.i.i677.56.extract.trunc, i32 7
+
+; Load %secondSource
+  %s1 = load <8 x i64> * %secondSource, align 64
+  %arrayidx67 = getelementptr inbounds <8 x i64> * %secondSource, i32 6
+  %s121 = load <8 x i64> * %arrayidx67, align 64
+  %s131 = bitcast <8 x i64> %s121 to i512
+  %data.i1.i676.48.extract.shift = lshr i512 %s131, 384
+  %data.i1.i676.48.extract.trunc = trunc i512 %data.i1.i676.48.extract.shift to i64
+  %s132 = insertelement <8 x i64> undef, i64 %data.i1.i676.48.extract.trunc, i32 0
+  %data.i1.i676.32.extract.shift = lshr i512 %s131, 256
+  %data.i1.i676.32.extract.trunc = trunc i512 %data.i1.i676.32.extract.shift to i64
+  %s133 = insertelement <8 x i64> %s132, i64 %data.i1.i676.32.extract.trunc, i32 1
+  %data.i1.i676.16.extract.shift = lshr i512 %s131, 128
+  %data.i1.i676.16.extract.trunc = trunc i512 %data.i1.i676.16.extract.shift to i64
+  %s134 = insertelement <8 x i64> %s133, i64 %data.i1.i676.16.extract.trunc, i32 2
+  %data.i1.i676.56.extract.shift = lshr i512 %s131, 448
+  %data.i1.i676.56.extract.trunc = trunc i512 %data.i1.i676.56.extract.shift to i64
+  %s135 = insertelement <8 x i64> %s134, i64 %data.i1.i676.56.extract.trunc, i32 3
+  %data.i1.i676.24.extract.shift = lshr i512 %s131, 192
+  %data.i1.i676.24.extract.trunc = trunc i512 %data.i1.i676.24.extract.shift to i64
+  %s136 = insertelement <8 x i64> %s135, i64 %data.i1.i676.24.extract.trunc, i32 4
+  %s137 = insertelement <8 x i64> %s136, i64 %data.i1.i676.32.extract.trunc, i32 5
+  %s138 = insertelement <8 x i64> %s137, i64 %data.i1.i676.16.extract.trunc, i32 6
+  %s139 = insertelement <8 x i64> %s138, i64 %data.i1.i676.56.extract.trunc, i32 7
+
+; Operations about %Source and %secondSource
+  %vecinit28.i.i699 = shufflevector <8 x i64> %s139, <8 x i64> %s130, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 12, i32 undef, i32 undef, i32 undef>
+  %vecinit35.i.i700 = shufflevector <8 x i64> %vecinit28.i.i699, <8 x i64> %s139, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 13, i32 undef, i32 undef>
+  %vecinit42.i.i701 = shufflevector <8 x i64> %vecinit35.i.i700, <8 x i64> %s139, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 14, i32 undef>
+  %vecinit49.i.i702 = shufflevector <8 x i64> %vecinit42.i.i701, <8 x i64> %s130, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 15>
+  %arrayidx72 = getelementptr inbounds <8 x i64> * %dest, i32 6
+  store <8 x i64> %vecinit49.i.i702, <8 x i64> * %arrayidx72, align 64
+  %arrayidx78 = getelementptr inbounds <8 x i64> * %secondSource, i32 7
+  %s141 = load <8 x i64> * %arrayidx78, align 64
+  %s151 = bitcast <8 x i64> %s141 to i512
+  %data.i1.i649.32.extract.shift = lshr i512 %s151, 256
+  %data.i1.i649.32.extract.trunc = trunc i512 %data.i1.i649.32.extract.shift to i64
+  %s152 = insertelement <8 x i64> undef, i64 %data.i1.i649.32.extract.trunc, i32 0
+  %s153 = insertelement <8 x i64> %s152, i64 %data.i1.i649.32.extract.trunc, i32 1
+  %data.i1.i649.16.extract.shift = lshr i512 %s151, 128
+  %data.i1.i649.16.extract.trunc = trunc i512 %data.i1.i649.16.extract.shift to i64
+  %s154 = insertelement <8 x i64> %s153, i64 %data.i1.i649.16.extract.trunc, i32 2
+  %data.i1.i649.8.extract.shift = lshr i512 %s151, 64
+  %data.i1.i649.8.extract.trunc = trunc i512 %data.i1.i649.8.extract.shift to i64
+  %s155 = insertelement <8 x i64> %s154, i64 %data.i1.i649.8.extract.trunc, i32 3
+  %arrayidx83 = getelementptr inbounds <8 x i64> * %dest, i32 7
+  store <8 x i64> %s155, <8 x i64> * %arrayidx83, align 64
+  ret void
+}