Index: llvm/trunk/lib/Target/ARM/ARMParallelDSP.cpp
===================================================================
--- llvm/trunk/lib/Target/ARM/ARMParallelDSP.cpp
+++ llvm/trunk/lib/Target/ARM/ARMParallelDSP.cpp
@@ -68,7 +68,7 @@
     }
 
     LoadInst *getBaseLoad() const {
-      return cast<LoadInst>(LHS);
+      return VecLd.front();
     }
   };
 
@@ -696,13 +696,15 @@
   // Loads[0] needs trunc while Loads[1] needs a lshr and trunc.
   // TODO: Support big-endian as well.
   Value *Bottom = IRB.CreateTrunc(WideLoad, Base->getType());
-  BaseSExt->setOperand(0, Bottom);
+  Value *NewBaseSExt = IRB.CreateSExt(Bottom, BaseSExt->getType());
+  BaseSExt->replaceAllUsesWith(NewBaseSExt);
 
   IntegerType *OffsetTy = cast<IntegerType>(Offset->getType());
   Value *ShiftVal = ConstantInt::get(LoadTy, OffsetTy->getBitWidth());
   Value *Top = IRB.CreateLShr(WideLoad, ShiftVal);
   Value *Trunc = IRB.CreateTrunc(Top, OffsetTy);
-  OffsetSExt->setOperand(0, Trunc);
+  Value *NewOffsetSExt = IRB.CreateSExt(Trunc, OffsetSExt->getType());
+  OffsetSExt->replaceAllUsesWith(NewOffsetSExt);
 
   WideLoads.emplace(std::make_pair(Base,
                                    make_unique<WidenedLoad>(Loads, WideLoad)));
Index: llvm/trunk/test/CodeGen/ARM/ParallelDSP/blocks.ll
===================================================================
--- llvm/trunk/test/CodeGen/ARM/ParallelDSP/blocks.ll
+++ llvm/trunk/test/CodeGen/ARM/ParallelDSP/blocks.ll
@@ -5,7 +5,7 @@
 ; CHECK: [[A:%[^ ]+]] = load i32, i32* [[CAST_A]]
 ; CHECK: [[CAST_B:%[^ ]+]] = bitcast i16* %b to i32*
 ; CHECK: [[B:%[^ ]+]] = load i32, i32* [[CAST_B]]
-; CHECK  call i32 @llvm.arm.smlad(i32 [[A]], i32 [[B]], i32 %acc)
+; CHECK: call i32 @llvm.arm.smlad(i32 [[A]], i32 [[B]], i32 %acc)
 define i32 @single_block(i16* %a, i16* %b, i32 %acc) {
 entry:
   %ld.a.0 = load i16, i16* %a
@@ -30,7 +30,7 @@
 ; CHECK: [[A:%[^ ]+]] = load i32, i32* [[CAST_A]]
 ; CHECK: [[CAST_B:%[^ ]+]] = bitcast i16* %b to i32*
 ; CHECK: [[B:%[^ ]+]] = load i32, i32* [[CAST_B]]
-; CHECK  call i32 @llvm.arm.smlad(i32 [[A]], i32 [[B]], i32 0)
+; CHECK:  call i32 @llvm.arm.smlad(i32 [[A]], i32 [[B]], i32 0)
 define i32 @multi_block(i16* %a, i16* %b, i32 %acc) {
 entry:
   %ld.a.0 = load i16, i16* %a
Index: llvm/trunk/test/CodeGen/ARM/ParallelDSP/exchange.ll
===================================================================
--- llvm/trunk/test/CodeGen/ARM/ParallelDSP/exchange.ll
+++ llvm/trunk/test/CodeGen/ARM/ParallelDSP/exchange.ll
@@ -0,0 +1,329 @@
+; RUN: opt -arm-parallel-dsp -mtriple=armv7-a -S %s -o - | FileCheck %s
+
+; CHECK-LABEL: exchange_1
+; CHECK: [[CAST_A:%[^ ]+]] = bitcast i16* %a to i32*
+; CHECK: [[LD_A:%[^ ]+]] = load i32, i32* [[CAST_A]]
+; CHECK: [[CAST_B:%[^ ]+]] = bitcast i16* %b to i32*
+; CHECK: [[LD_B:%[^ ]+]] = load i32, i32* [[CAST_B]]
+; CHECK: call i32 @llvm.arm.smladx(i32 [[LD_A]], i32 [[LD_B]]
+define i32 @exchange_1(i16* %a, i16* %b, i32 %acc) {
+entry:
+  %addr.a.1 = getelementptr i16, i16* %a, i32 1
+  %addr.b.1 = getelementptr i16, i16* %b, i32 1
+  %ld.a.0 = load i16, i16* %a
+  %sext.a.0 = sext i16 %ld.a.0 to i32
+  %ld.b.0 = load i16, i16* %b
+  %ld.a.1 = load i16, i16* %addr.a.1
+  %ld.b.1 = load i16, i16* %addr.b.1
+  %sext.a.1 = sext i16 %ld.a.1 to i32
+  %sext.b.1 = sext i16 %ld.b.1 to i32
+  %sext.b.0 = sext i16 %ld.b.0 to i32
+  %mul.0 = mul i32 %sext.a.0, %sext.b.1
+  %mul.1 = mul i32 %sext.a.1, %sext.b.0
+  %add = add i32 %mul.0, %mul.1
+  %res = add i32 %add, %acc
+  ret i32 %res
+}
+
+; CHECK-LABEL: exchange_2
+; CHECK: [[CAST_A:%[^ ]+]] = bitcast i16* %a to i32*
+; CHECK: [[LD_A:%[^ ]+]] = load i32, i32* [[CAST_A]]
+; CHECK: [[CAST_B:%[^ ]+]] = bitcast i16* %b to i32*
+; CHECK: [[LD_B:%[^ ]+]] = load i32, i32* [[CAST_B]]
+; CHECK: call i32 @llvm.arm.smladx(i32 [[LD_A]], i32 [[LD_B]]
+define i32 @exchange_2(i16* %a, i16* %b, i32 %acc) {
+entry:
+  %addr.a.1 = getelementptr i16, i16* %a, i32 1
+  %addr.b.1 = getelementptr i16, i16* %b, i32 1
+  %ld.a.0 = load i16, i16* %a
+  %sext.a.0 = sext i16 %ld.a.0 to i32
+  %ld.b.0 = load i16, i16* %b
+  %ld.a.1 = load i16, i16* %addr.a.1
+  %ld.b.1 = load i16, i16* %addr.b.1
+  %sext.a.1 = sext i16 %ld.a.1 to i32
+  %sext.b.1 = sext i16 %ld.b.1 to i32
+  %sext.b.0 = sext i16 %ld.b.0 to i32
+  %mul.0 = mul i32 %sext.b.1, %sext.a.0
+  %mul.1 = mul i32 %sext.b.0, %sext.a.1
+  %add = add i32 %mul.0, %mul.1
+  %res = add i32 %add, %acc
+  ret i32 %res
+}
+
+; CHECK-LABEL: exchange_3
+; CHECK: [[CAST_A:%[^ ]+]] = bitcast i16* %a to i32*
+; CHECK: [[LD_A:%[^ ]+]] = load i32, i32* [[CAST_A]]
+; CHECK: [[CAST_B:%[^ ]+]] = bitcast i16* %b to i32*
+; CHECK: [[LD_B:%[^ ]+]] = load i32, i32* [[CAST_B]]
+; CHECK: call i32 @llvm.arm.smladx(i32 [[LD_B]], i32 [[LD_A]]
+define i32 @exchange_3(i16* %a, i16* %b, i32 %acc) {
+entry:
+  %addr.a.1 = getelementptr i16, i16* %a, i32 1
+  %addr.b.1 = getelementptr i16, i16* %b, i32 1
+  %ld.a.0 = load i16, i16* %a
+  %sext.a.0 = sext i16 %ld.a.0 to i32
+  %ld.b.0 = load i16, i16* %b
+  %ld.a.1 = load i16, i16* %addr.a.1
+  %ld.b.1 = load i16, i16* %addr.b.1
+  %sext.a.1 = sext i16 %ld.a.1 to i32
+  %sext.b.1 = sext i16 %ld.b.1 to i32
+  %sext.b.0 = sext i16 %ld.b.0 to i32
+  %mul.0 = mul i32 %sext.a.0, %sext.b.1
+  %mul.1 = mul i32 %sext.a.1, %sext.b.0
+  %add = add i32 %mul.1, %mul.0
+  %res = add i32 %add, %acc
+  ret i32 %res
+}
+
+; CHECK-LABEL: exchange_4
+; CHECK: [[CAST_A:%[^ ]+]] = bitcast i16* %a to i32*
+; CHECK: [[LD_A:%[^ ]+]] = load i32, i32* [[CAST_A]]
+; CHECK: [[CAST_B:%[^ ]+]] = bitcast i16* %b to i32*
+; CHECK: [[LD_B:%[^ ]+]] = load i32, i32* [[CAST_B]]
+; CHECK: call i32 @llvm.arm.smladx(i32 [[LD_B]], i32 [[LD_A]]
+define i32 @exchange_4(i16* %a, i16* %b, i32 %acc) {
+entry:
+  %addr.a.1 = getelementptr i16, i16* %a, i32 1
+  %addr.b.1 = getelementptr i16, i16* %b, i32 1
+  %ld.a.0 = load i16, i16* %a
+  %sext.a.0 = sext i16 %ld.a.0 to i32
+  %ld.b.0 = load i16, i16* %b
+  %ld.a.1 = load i16, i16* %addr.a.1
+  %ld.b.1 = load i16, i16* %addr.b.1
+  %sext.a.1 = sext i16 %ld.a.1 to i32
+  %sext.b.1 = sext i16 %ld.b.1 to i32
+  %sext.b.0 = sext i16 %ld.b.0 to i32
+  %mul.0 = mul i32 %sext.b.1, %sext.a.0
+  %mul.1 = mul i32 %sext.b.0, %sext.a.1
+  %add = add i32 %mul.1, %mul.0
+  %res = add i32 %add, %acc
+  ret i32 %res
+}
+
+; CHECK-LABEL: exchange_multi_use_1
+; CHECK: [[CAST_A:%[^ ]+]] = bitcast i16* %a to i32*
+; CHECK: [[LD_A:%[^ ]+]] = load i32, i32* [[CAST_A]]
+; CHECK: [[CAST_B:%[^ ]+]] = bitcast i16* %b to i32*
+; CHECK: [[LD_B:%[^ ]+]] = load i32, i32* [[CAST_B]]
+; CHECK: [[GEP:%[^ ]+]] = getelementptr i16, i16* %a, i32 2
+; CHECK: [[CAST_A_2:%[^ ]+]] = bitcast i16* [[GEP]] to i32*
+; CHECK: [[LD_A_2:%[^ ]+]] = load i32, i32* [[CAST_A_2]]
+; CHECK: [[X:%[^ ]+]] = call i32 @llvm.arm.smladx(i32 [[LD_A]], i32 [[LD_B]], i32 %acc
+; CHECK: call i32 @llvm.arm.smlad(i32 [[LD_A_2]], i32 [[LD_B]], i32 [[X]])
+define i32 @exchange_multi_use_1(i16* %a, i16* %b, i32 %acc) {
+entry:
+  %addr.a.1 = getelementptr i16, i16* %a, i32 1
+  %addr.b.1 = getelementptr i16, i16* %b, i32 1
+  %ld.a.0 = load i16, i16* %a
+  %sext.a.0 = sext i16 %ld.a.0 to i32
+  %ld.b.0 = load i16, i16* %b
+  %ld.a.1 = load i16, i16* %addr.a.1
+  %ld.b.1 = load i16, i16* %addr.b.1
+  %sext.a.1 = sext i16 %ld.a.1 to i32
+  %sext.b.1 = sext i16 %ld.b.1 to i32
+  %sext.b.0 = sext i16 %ld.b.0 to i32
+  %mul.0 = mul i32 %sext.a.0, %sext.b.1
+  %mul.1 = mul i32 %sext.a.1, %sext.b.0
+  %add = add i32 %mul.0, %mul.1
+  %addr.a.2 = getelementptr i16, i16* %a, i32 2
+  %addr.a.3 = getelementptr i16, i16* %a, i32 3
+  %ld.a.2 = load i16, i16* %addr.a.2
+  %ld.a.3 = load i16, i16* %addr.a.3
+  %sext.a.2 = sext i16 %ld.a.2 to i32
+  %sext.a.3 = sext i16 %ld.a.3 to i32
+  %mul.2 = mul i32 %sext.a.3, %sext.b.1
+  %mul.3 = mul i32 %sext.a.2, %sext.b.0
+  %add.1 = add i32 %mul.2, %mul.3
+  %add.2 = add i32 %add, %add.1
+  %res = add i32 %add.2, %acc
+  ret i32 %res
+}
+
+; CHECK-LABEL: exchange_multi_use_2
+; CHECK: [[CAST_A:%[^ ]+]] = bitcast i16* %a to i32*
+; CHECK: [[LD_A:%[^ ]+]] = load i32, i32* [[CAST_A]]
+; CHECK: [[CAST_B:%[^ ]+]] = bitcast i16* %b to i32*
+; CHECK: [[LD_B:%[^ ]+]] = load i32, i32* [[CAST_B]]
+; CHECK: [[GEP:%[^ ]+]] = getelementptr i16, i16* %a, i32 2
+; CHECK: [[CAST_A_2:%[^ ]+]] = bitcast i16* [[GEP]] to i32*
+; CHECK: [[LD_A_2:%[^ ]+]] = load i32, i32* [[CAST_A_2]]
+; CHECK: [[X:%[^ ]+]] = call i32 @llvm.arm.smlad(i32 [[LD_A]], i32 [[LD_B]], i32 %acc
+; CHECK: call i32 @llvm.arm.smladx(i32 [[LD_B]], i32 [[LD_A_2]], i32 [[X]])
+define i32 @exchange_multi_use_2(i16* %a, i16* %b, i32 %acc) {
+entry:
+  %addr.a.1 = getelementptr i16, i16* %a, i32 1
+  %addr.b.1 = getelementptr i16, i16* %b, i32 1
+  %ld.a.0 = load i16, i16* %a
+  %sext.a.0 = sext i16 %ld.a.0 to i32
+  %ld.b.0 = load i16, i16* %b
+  %ld.a.1 = load i16, i16* %addr.a.1
+  %ld.b.1 = load i16, i16* %addr.b.1
+  %sext.a.1 = sext i16 %ld.a.1 to i32
+  %sext.b.1 = sext i16 %ld.b.1 to i32
+  %sext.b.0 = sext i16 %ld.b.0 to i32
+  %mul.0 = mul i32 %sext.a.0, %sext.b.0
+  %mul.1 = mul i32 %sext.a.1, %sext.b.1
+  %add = add i32 %mul.0, %mul.1
+  %addr.a.2 = getelementptr i16, i16* %a, i32 2
+  %addr.a.3 = getelementptr i16, i16* %a, i32 3
+  %ld.a.2 = load i16, i16* %addr.a.2
+  %ld.a.3 = load i16, i16* %addr.a.3
+  %sext.a.2 = sext i16 %ld.a.2 to i32
+  %sext.a.3 = sext i16 %ld.a.3 to i32
+  %mul.2 = mul i32 %sext.b.0, %sext.a.3
+  %mul.3 = mul i32 %sext.b.1, %sext.a.2
+  %add.1 = add i32 %mul.2, %mul.3
+  %add.2 = add i32 %add, %add.1
+  %res = add i32 %add.2, %acc
+  ret i32 %res
+}
+
+; TODO: Why aren't two intrinsics generated?
+; CHECK-LABEL: exchange_multi_use_3
+; CHECK: [[CAST_B:%[^ ]+]] = bitcast i16* %b to i32*
+; CHECK: [[LD_B:%[^ ]+]] = load i32, i32* [[CAST_B]]
+; CHECK: [[GEP:%[^ ]+]] = getelementptr i16, i16* %a, i32 2
+; CHECK: [[CAST_A_2:%[^ ]+]] = bitcast i16* [[GEP]] to i32*
+; CHECK: [[LD_A_2:%[^ ]+]] = load i32, i32* [[CAST_A_2]]
+; CHECK-NOT: call i32 @llvm.arm.smlad
+; CHECK: [[X:%[^ ]+]] = call i32 @llvm.arm.smladx(i32 [[LD_B]], i32 [[LD_A_2]], i32 0
+define i32 @exchange_multi_use_3(i16* %a, i16* %b, i32 %acc) {
+entry:
+  %addr.a.1 = getelementptr i16, i16* %a, i32 1
+  %addr.b.1 = getelementptr i16, i16* %b, i32 1
+  %ld.a.0 = load i16, i16* %a
+  %sext.a.0 = sext i16 %ld.a.0 to i32
+  %ld.b.0 = load i16, i16* %b
+  %ld.a.1 = load i16, i16* %addr.a.1
+  %ld.b.1 = load i16, i16* %addr.b.1
+  %sext.a.1 = sext i16 %ld.a.1 to i32
+  %sext.b.1 = sext i16 %ld.b.1 to i32
+  %sext.b.0 = sext i16 %ld.b.0 to i32
+  %addr.a.2 = getelementptr i16, i16* %a, i32 2
+  %addr.a.3 = getelementptr i16, i16* %a, i32 3
+  %ld.a.2 = load i16, i16* %addr.a.2
+  %ld.a.3 = load i16, i16* %addr.a.3
+  %sext.a.2 = sext i16 %ld.a.2 to i32
+  %sext.a.3 = sext i16 %ld.a.3 to i32
+  %mul.2 = mul i32 %sext.b.0, %sext.a.3
+  %mul.3 = mul i32 %sext.b.1, %sext.a.2
+  %mul.0 = mul i32 %sext.a.0, %sext.b.0
+  %mul.1 = mul i32 %sext.a.1, %sext.b.1
+  %add = add i32 %mul.0, %mul.1
+  %add.1 = add i32 %mul.2, %mul.3
+  %sub = sub i32 %add, %add.1
+  %res = add i32 %acc, %sub
+  ret i32 %res
+}
+
+; TODO: Why isn't smladx generated too?
+; CHECK-LABEL: exchange_multi_use_4
+; CHECK: [[CAST_A:%[^ ]+]] = bitcast i16* %a to i32*
+; CHECK: [[LD_A:%[^ ]+]] = load i32, i32* [[CAST_A]]
+; CHECK: [[CAST_B:%[^ ]+]] = bitcast i16* %b to i32*
+; CHECK: [[LD_B:%[^ ]+]] = load i32, i32* [[CAST_B]]
+; CHECK: [[X:%[^ ]+]] = call i32 @llvm.arm.smlad(i32 [[LD_A]], i32 [[LD_B]], i32 0
+; CHECK-NOT: call i32 @llvm.arm.smlad
+define i32 @exchange_multi_use_4(i16* %a, i16* %b, i32 %acc) {
+entry:
+  %addr.a.1 = getelementptr i16, i16* %a, i32 1
+  %addr.b.1 = getelementptr i16, i16* %b, i32 1
+  %ld.a.0 = load i16, i16* %a
+  %sext.a.0 = sext i16 %ld.a.0 to i32
+  %ld.b.0 = load i16, i16* %b
+  %ld.a.1 = load i16, i16* %addr.a.1
+  %ld.b.1 = load i16, i16* %addr.b.1
+  %sext.a.1 = sext i16 %ld.a.1 to i32
+  %sext.b.1 = sext i16 %ld.b.1 to i32
+  %sext.b.0 = sext i16 %ld.b.0 to i32
+  %addr.a.2 = getelementptr i16, i16* %a, i32 2
+  %addr.a.3 = getelementptr i16, i16* %a, i32 3
+  %ld.a.2 = load i16, i16* %addr.a.2
+  %ld.a.3 = load i16, i16* %addr.a.3
+  %sext.a.2 = sext i16 %ld.a.2 to i32
+  %sext.a.3 = sext i16 %ld.a.3 to i32
+  %mul.2 = mul i32 %sext.b.0, %sext.a.3
+  %mul.3 = mul i32 %sext.b.1, %sext.a.2
+  %mul.0 = mul i32 %sext.a.0, %sext.b.0
+  %mul.1 = mul i32 %sext.a.1, %sext.b.1
+  %add.1 = add i32 %mul.2, %mul.3
+  %add = add i32 %mul.0, %mul.1
+  %sub = sub i32 %add, %add.1
+  %res = add i32 %acc, %sub
+  ret i32 %res
+}
+
+; CHECK-LABEL: exchange_swap
+; CHECK: [[CAST_A:%[^ ]+]] = bitcast i16* %a to i32*
+; CHECK: [[LD_A:%[^ ]+]] = load i32, i32* [[CAST_A]]
+; CHECK: [[CAST_B:%[^ ]+]] = bitcast i16* %b to i32*
+; CHECK: [[LD_B:%[^ ]+]] = load i32, i32* [[CAST_B]]
+; CHECK: call i32 @llvm.arm.smladx(i32 [[LD_B]], i32 [[LD_A]]
+define i32 @exchange_swap(i16* %a, i16* %b, i32 %acc) {
+entry:
+  %addr.a.1 = getelementptr i16, i16* %a, i32 1
+  %addr.b.1 = getelementptr i16, i16* %b, i32 1
+  %ld.a.0 = load i16, i16* %a
+  %sext.a.0 = sext i16 %ld.a.0 to i32
+  %ld.b.0 = load i16, i16* %b
+  %ld.a.1 = load i16, i16* %addr.a.1
+  %ld.b.1 = load i16, i16* %addr.b.1
+  %sext.a.1 = sext i16 %ld.a.1 to i32
+  %sext.b.1 = sext i16 %ld.b.1 to i32
+  %sext.b.0 = sext i16 %ld.b.0 to i32
+  %mul.0 = mul i32 %sext.a.1, %sext.b.0
+  %mul.1 = mul i32 %sext.a.0, %sext.b.1
+  %add = add i32 %mul.0, %mul.1
+  %res = add i32 %add, %acc
+  ret i32 %res
+}
+
+; CHECK-LABEL: exchange_swap_2
+; CHECK: [[CAST_A:%[^ ]+]] = bitcast i16* %a to i32*
+; CHECK: [[LD_A:%[^ ]+]] = load i32, i32* [[CAST_A]]
+; CHECK: [[CAST_B:%[^ ]+]] = bitcast i16* %b to i32*
+; CHECK: [[LD_B:%[^ ]+]] = load i32, i32* [[CAST_B]]
+; CHECK: call i32 @llvm.arm.smladx(i32 [[LD_A]], i32 [[LD_B]]
+define i32 @exchange_swap_2(i16* %a, i16* %b, i32 %acc) {
+entry:
+  %addr.a.1 = getelementptr i16, i16* %a, i32 1
+  %addr.b.1 = getelementptr i16, i16* %b, i32 1
+  %ld.a.0 = load i16, i16* %a
+  %sext.a.0 = sext i16 %ld.a.0 to i32
+  %ld.b.0 = load i16, i16* %b
+  %ld.a.1 = load i16, i16* %addr.a.1
+  %ld.b.1 = load i16, i16* %addr.b.1
+  %sext.a.1 = sext i16 %ld.a.1 to i32
+  %sext.b.1 = sext i16 %ld.b.1 to i32
+  %sext.b.0 = sext i16 %ld.b.0 to i32
+  %mul.0 = mul i32 %sext.a.1, %sext.b.0
+  %mul.1 = mul i32 %sext.a.0, %sext.b.1
+  %add = add i32 %mul.1, %mul.0
+  %res = add i32 %add, %acc
+  ret i32 %res
+}
+
+; CHECK-LABEL: exchange_swap_3
+; CHECK: [[CAST_A:%[^ ]+]] = bitcast i16* %a to i32*
+; CHECK: [[LD_A:%[^ ]+]] = load i32, i32* [[CAST_A]]
+; CHECK: [[CAST_B:%[^ ]+]] = bitcast i16* %b to i32*
+; CHECK: [[LD_B:%[^ ]+]] = load i32, i32* [[CAST_B]]
+; CHECK: call i32 @llvm.arm.smladx(i32 [[LD_A]], i32 [[LD_B]]
+define i32 @exchange_swap_3(i16* %a, i16* %b, i32 %acc) {
+entry:
+  %addr.a.1 = getelementptr i16, i16* %a, i32 1
+  %addr.b.1 = getelementptr i16, i16* %b, i32 1
+  %ld.a.0 = load i16, i16* %a
+  %sext.a.0 = sext i16 %ld.a.0 to i32
+  %ld.b.0 = load i16, i16* %b
+  %ld.a.1 = load i16, i16* %addr.a.1
+  %ld.b.1 = load i16, i16* %addr.b.1
+  %sext.a.1 = sext i16 %ld.a.1 to i32
+  %sext.b.1 = sext i16 %ld.b.1 to i32
+  %sext.b.0 = sext i16 %ld.b.0 to i32
+  %mul.0 = mul i32 %sext.b.0, %sext.a.1
+  %mul.1 = mul i32 %sext.b.1, %sext.a.0
+  %add = add i32 %mul.1, %mul.0
+  %res = add i32 %add, %acc
+  ret i32 %res
+}
Index: llvm/trunk/test/CodeGen/ARM/ParallelDSP/overlapping.ll
===================================================================
--- llvm/trunk/test/CodeGen/ARM/ParallelDSP/overlapping.ll
+++ llvm/trunk/test/CodeGen/ARM/ParallelDSP/overlapping.ll
@@ -0,0 +1,161 @@
+; RUN: opt -arm-parallel-dsp -mtriple=armv7-a -S %s -o - | FileCheck %s
+
+; CHECK-LABEL: overlap_1
+; CHECK: [[GEP_A:%[^ ]+]] = getelementptr i16, i16* %a, i32 1
+; CHECK: [[GEP_B:%[^ ]+]] = getelementptr i16, i16* %b, i32 1
+; CHECK: [[CAST_A:%[^ ]+]] = bitcast i16* [[GEP_A]] to i32*
+; CHECK: [[LD_A:%[^ ]+]] = load i32, i32* [[CAST_A]]
+; CHECK: [[CAST_B:%[^ ]+]] = bitcast i16* [[GEP_B]] to i32*
+; CHECK: [[LD_B:%[^ ]+]] = load i32, i32* [[CAST_B]]
+; CHECK: call i32 @llvm.arm.smlad(i32 [[LD_A]], i32 [[LD_B]], i32 %acc
+define i32 @overlap_1(i16* %a, i16* %b, i32 %acc) {
+entry:
+  %addr.a.1 = getelementptr i16, i16* %a, i32 1
+  %addr.b.1 = getelementptr i16, i16* %b, i32 1
+  %ld.a.0 = load i16, i16* %a
+  %sext.a.0 = sext i16 %ld.a.0 to i32
+  %ld.b.0 = load i16, i16* %b
+  %ld.a.1 = load i16, i16* %addr.a.1
+  %ld.b.1 = load i16, i16* %addr.b.1
+  %sext.a.1 = sext i16 %ld.a.1 to i32
+  %sext.b.1 = sext i16 %ld.b.1 to i32
+  %sext.b.0 = sext i16 %ld.b.0 to i32
+  %mul.0 = mul i32 %sext.a.0, %sext.b.0
+  %mul.1 = mul i32 %sext.a.1, %sext.b.1
+  %addr.a.2 = getelementptr i16, i16* %a, i32 2
+  %addr.b.2 = getelementptr i16, i16* %b, i32 2
+  %ld.a.2 = load i16, i16* %addr.a.2
+  %ld.b.2 = load i16, i16* %addr.b.2
+  %sext.a.2 = sext i16 %ld.a.2 to i32
+  %sext.b.2 = sext i16 %ld.b.2 to i32
+  %mul.2 = mul i32 %sext.a.2, %sext.b.2
+  %add = add i32 %mul.0, %mul.1
+  %add.1 = add i32 %mul.1, %mul.2
+  %add.2 = add i32 %add.1, %add
+  %res = add i32 %add.2, %acc
+  ret i32 %res
+}
+
+; CHECK-LABEL: overlap_2
+; CHECK: [[CAST_A:%[^ ]+]] = bitcast i16* %a to i32*
+; CHECK: [[LD_A:%[^ ]+]] = load i32, i32* [[CAST_A]]
+; CHECK: [[CAST_B:%[^ ]+]] = bitcast i16* %b to i32*
+; CHECK: [[LD_B:%[^ ]+]] = load i32, i32* [[CAST_B]]
+; CHECK: call i32 @llvm.arm.smlad(i32 [[LD_A]], i32 [[LD_B]], i32 %acc
+define i32 @overlap_2(i16* %a, i16* %b, i32 %acc) {
+entry:
+  %addr.a.1 = getelementptr i16, i16* %a, i32 1
+  %addr.b.1 = getelementptr i16, i16* %b, i32 1
+  %ld.a.0 = load i16, i16* %a
+  %sext.a.0 = sext i16 %ld.a.0 to i32
+  %ld.b.0 = load i16, i16* %b
+  %ld.a.1 = load i16, i16* %addr.a.1
+  %ld.b.1 = load i16, i16* %addr.b.1
+  %sext.a.1 = sext i16 %ld.a.1 to i32
+  %sext.b.1 = sext i16 %ld.b.1 to i32
+  %sext.b.0 = sext i16 %ld.b.0 to i32
+  %mul.0 = mul i32 %sext.a.0, %sext.b.0
+  %mul.1 = mul i32 %sext.a.1, %sext.b.1
+  %addr.a.2 = getelementptr i16, i16* %a, i32 2
+  %addr.b.2 = getelementptr i16, i16* %b, i32 2
+  %ld.a.2 = load i16, i16* %addr.a.2
+  %ld.b.2 = load i16, i16* %addr.b.2
+  %sext.a.2 = sext i16 %ld.a.2 to i32
+  %sext.b.2 = sext i16 %ld.b.2 to i32
+  %mul.2 = mul i32 %sext.b.2, %sext.a.2
+  %add = add i32 %mul.0, %mul.1
+  %add.1 = add i32 %mul.1, %mul.2
+  %add.2 = add i32 %add, %add.1
+  %res = add i32 %add.2, %acc
+  ret i32 %res
+}
+
+; CHECK-LABEL: overlap_3
+; CHECK: [[GEP_B:%[^ ]+]] = getelementptr i16, i16* %b, i32 1
+; CHECK: [[CAST_A:%[^ ]+]] = bitcast i16* %a to i32*
+; CHECK: [[LD_A:%[^ ]+]] = load i32, i32* [[CAST_A]]
+; CHECK: [[CAST_B:%[^ ]+]] = bitcast i16* %b to i32*
+; CHECK: [[LD_B:%[^ ]+]] = load i32, i32* [[CAST_B]]
+; CHECK: [[CAST_B_1:%[^ ]+]] = bitcast i16* [[GEP_B]] to i32*
+; CHECK: [[LD_B_1:%[^ ]+]] = load i32, i32* [[CAST_B_1]]
+; CHECK: [[GEP_A:%[^ ]+]] = getelementptr i16, i16* %a, i32 2
+; CHECK: [[CAST_A_2:%[^ ]+]] = bitcast i16* [[GEP_A]] to i32*
+; CHECK: [[LD_A_2:%[^ ]+]] = load i32, i32* [[CAST_A_2]]
+; CHECK: [[SMLAD:%[^ ]+]] = call i32 @llvm.arm.smlad(i32 [[LD_A_2]], i32 [[LD_B_1]], i32 %acc)
+; CHECK: call i32 @llvm.arm.smlad(i32 [[LD_A]], i32 [[LD_B]], i32 [[SMLAD]])
+define i32 @overlap_3(i16* %a, i16* %b, i32 %acc) {
+entry:
+  %addr.a.1 = getelementptr i16, i16* %a, i32 1
+  %addr.b.1 = getelementptr i16, i16* %b, i32 1
+  %ld.a.0 = load i16, i16* %a
+  %sext.a.0 = sext i16 %ld.a.0 to i32
+  %ld.b.0 = load i16, i16* %b
+  %ld.a.1 = load i16, i16* %addr.a.1
+  %ld.b.1 = load i16, i16* %addr.b.1
+  %sext.a.1 = sext i16 %ld.a.1 to i32
+  %sext.b.1 = sext i16 %ld.b.1 to i32
+  %sext.b.0 = sext i16 %ld.b.0 to i32
+  %mul.0 = mul i32 %sext.a.0, %sext.b.0
+  %mul.1 = mul i32 %sext.a.1, %sext.b.1
+  %addr.a.2 = getelementptr i16, i16* %a, i32 2
+  %addr.b.2 = getelementptr i16, i16* %b, i32 2
+  %addr.a.3 = getelementptr i16, i16* %a, i32 3
+  %ld.a.2 = load i16, i16* %addr.a.2
+  %ld.b.2 = load i16, i16* %addr.b.2
+  %ld.a.3 = load i16, i16* %addr.a.3
+  %sext.a.2 = sext i16 %ld.a.2 to i32
+  %sext.b.2 = sext i16 %ld.b.2 to i32
+  %sext.a.3 = sext i16 %ld.a.3 to i32
+  %mul.2 = mul i32 %sext.a.2, %sext.b.1
+  %mul.3 = mul i32 %sext.a.3, %sext.b.2
+  %add = add i32 %mul.0, %mul.1
+  %add.1 = add i32 %mul.2, %mul.3
+  %add.2 = add i32 %add.1, %add
+  %res = add i32 %add.2, %acc
+  ret i32 %res
+}
+
+; CHECK-LABEL: overlap_4
+; CHECK: [[GEP_B:%[^ ]+]] = getelementptr i16, i16* %b, i32 1
+; CHECK: [[CAST_A:%[^ ]+]] = bitcast i16* %a to i32*
+; CHECK: [[LD_A:%[^ ]+]] = load i32, i32* [[CAST_A]]
+; CHECK: [[CAST_B:%[^ ]+]] = bitcast i16* %b to i32*
+; CHECK: [[LD_B:%[^ ]+]] = load i32, i32* [[CAST_B]]
+; CHECK: [[CAST_B_1:%[^ ]+]] = bitcast i16* [[GEP_B]] to i32*
+; CHECK: [[LD_B_1:%[^ ]+]] = load i32, i32* [[CAST_B_1]]
+; CHECK: [[GEP_A:%[^ ]+]] = getelementptr i16, i16* %a, i32 2
+; CHECK: [[CAST_A_2:%[^ ]+]] = bitcast i16* [[GEP_A]] to i32*
+; CHECK: [[LD_A_2:%[^ ]+]] = load i32, i32* [[CAST_A_2]]
+; CHECK: [[SMLAD:%[^ ]+]] = call i32 @llvm.arm.smladx(i32 [[LD_A_2]], i32 [[LD_B_1]], i32 %acc)
+; CHECK: call i32 @llvm.arm.smlad(i32 [[LD_A]], i32 [[LD_B]], i32 [[SMLAD]])
+define i32 @overlap_4(i16* %a, i16* %b, i32 %acc) {
+entry:
+  %addr.a.1 = getelementptr i16, i16* %a, i32 1
+  %addr.b.1 = getelementptr i16, i16* %b, i32 1
+  %ld.a.0 = load i16, i16* %a
+  %sext.a.0 = sext i16 %ld.a.0 to i32
+  %ld.b.0 = load i16, i16* %b
+  %ld.a.1 = load i16, i16* %addr.a.1
+  %ld.b.1 = load i16, i16* %addr.b.1
+  %sext.a.1 = sext i16 %ld.a.1 to i32
+  %sext.b.1 = sext i16 %ld.b.1 to i32
+  %sext.b.0 = sext i16 %ld.b.0 to i32
+  %mul.0 = mul i32 %sext.a.0, %sext.b.0
+  %mul.1 = mul i32 %sext.a.1, %sext.b.1
+  %addr.a.2 = getelementptr i16, i16* %a, i32 2
+  %addr.b.2 = getelementptr i16, i16* %b, i32 2
+  %addr.a.3 = getelementptr i16, i16* %a, i32 3
+  %ld.a.2 = load i16, i16* %addr.a.2
+  %ld.b.2 = load i16, i16* %addr.b.2
+  %ld.a.3 = load i16, i16* %addr.a.3
+  %sext.a.2 = sext i16 %ld.a.2 to i32
+  %sext.b.2 = sext i16 %ld.b.2 to i32
+  %sext.a.3 = sext i16 %ld.a.3 to i32
+  %mul.2 = mul i32 %sext.b.2, %sext.a.2
+  %mul.3 = mul i32 %sext.b.1, %sext.a.3
+  %add = add i32 %mul.0, %mul.1
+  %add.1 = add i32 %mul.2, %mul.3
+  %add.2 = add i32 %add.1, %add
+  %res = add i32 %add.2, %acc
+  ret i32 %res
+}