Index: lib/CodeGen/SelectionDAG/DAGCombiner.cpp
===================================================================
--- lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -2414,8 +2414,6 @@
   SDValue N0 = N->getOperand(0);
   SDValue N1 = N->getOperand(1);
   EVT VT = N0.getValueType();
-  if (VT.isVector())
-    return SDValue();
 
   EVT CarryVT = N->getValueType(1);
   SDLoc DL(N);
@@ -2426,13 +2424,12 @@
                      DAG.getUNDEF(CarryVT));
 
   // canonicalize constant to RHS.
-  ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
-  ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
-  if (N0C && !N1C)
+  if (DAG.isConstantIntBuildVectorOrConstantInt(N0) &&
+      !DAG.isConstantIntBuildVectorOrConstantInt(N1))
     return DAG.getNode(ISD::UADDO, DL, N->getVTList(), N1, N0);
 
   // fold (uaddo x, 0) -> x + no carry out
-  if (isNullConstant(N1))
+  if (isNullOrNullSplat(N1))
     return CombineTo(N, N0, DAG.getConstant(0, DL, CarryVT));
 
   // If it cannot overflow, transform into an add.
@@ -2898,8 +2895,6 @@
   SDValue N0 = N->getOperand(0);
   SDValue N1 = N->getOperand(1);
   EVT VT = N0.getValueType();
-  if (VT.isVector())
-    return SDValue();
 
   EVT CarryVT = N->getValueType(1);
   SDLoc DL(N);
@@ -2915,11 +2910,11 @@
                      DAG.getConstant(0, DL, CarryVT));
 
   // fold (usubo x, 0) -> x + no borrow
-  if (isNullConstant(N1))
+  if (isNullOrNullSplat(N1))
     return CombineTo(N, N0, DAG.getConstant(0, DL, CarryVT));
 
   // Canonicalize (usubo -1, x) -> ~x, i.e. (xor x, -1) + no borrow
-  if (isAllOnesConstant(N0))
+  if (isAllOnesOrAllOnesSplat(N0))
     return CombineTo(N, DAG.getNode(ISD::XOR, DL, VT, N1, N0),
                      DAG.getConstant(0, DL, CarryVT));
 
Index: test/CodeGen/X86/combine-addo.ll
===================================================================
--- test/CodeGen/X86/combine-addo.ll
+++ test/CodeGen/X86/combine-addo.ll
@@ -84,22 +84,10 @@
 define <4 x i32> @combine_vec_uadd_zero(<4 x i32> %a0, <4 x i32> %a1) {
 ; SSE-LABEL: combine_vec_uadd_zero:
 ; SSE:       # %bb.0:
-; SSE-NEXT:    movdqa %xmm0, %xmm2
-; SSE-NEXT:    pmaxud %xmm0, %xmm0
-; SSE-NEXT:    pcmpeqd %xmm2, %xmm0
-; SSE-NEXT:    pcmpeqd %xmm3, %xmm3
-; SSE-NEXT:    pxor %xmm3, %xmm0
-; SSE-NEXT:    blendvps %xmm0, %xmm1, %xmm2
-; SSE-NEXT:    movaps %xmm2, %xmm0
 ; SSE-NEXT:    retq
 ;
 ; AVX-LABEL: combine_vec_uadd_zero:
 ; AVX:       # %bb.0:
-; AVX-NEXT:    vpmaxud %xmm0, %xmm0, %xmm2
-; AVX-NEXT:    vpcmpeqd %xmm2, %xmm0, %xmm2
-; AVX-NEXT:    vpcmpeqd %xmm3, %xmm3, %xmm3
-; AVX-NEXT:    vpxor %xmm3, %xmm2, %xmm2
-; AVX-NEXT:    vblendvps %xmm2, %xmm1, %xmm0, %xmm0
 ; AVX-NEXT:    retq
   %1 = call {<4 x i32>, <4 x i1>} @llvm.uadd.with.overflow.v4i32(<4 x i32> %a0, <4 x i32> zeroinitializer)
   %2 = extractvalue {<4 x i32>, <4 x i1>} %1, 0
@@ -134,12 +122,12 @@
 define <4 x i32> @combine_vec_uadd_not(<4 x i32> %a0, <4 x i32> %a1) {
 ; SSE-LABEL: combine_vec_uadd_not:
 ; SSE:       # %bb.0:
-; SSE-NEXT:    pcmpeqd %xmm3, %xmm3
-; SSE-NEXT:    pxor %xmm3, %xmm0
-; SSE-NEXT:    movdqa %xmm0, %xmm2
-; SSE-NEXT:    psubd %xmm3, %xmm2
-; SSE-NEXT:    pmaxud %xmm2, %xmm0
-; SSE-NEXT:    pcmpeqd %xmm2, %xmm0
+; SSE-NEXT:    pxor %xmm2, %xmm2
+; SSE-NEXT:    psubd %xmm0, %xmm2
+; SSE-NEXT:    movdqa {{.*#+}} xmm3 = [1,1,1,1]
+; SSE-NEXT:    pmaxud %xmm2, %xmm3
+; SSE-NEXT:    pcmpeqd %xmm2, %xmm3
+; SSE-NEXT:    pcmpeqd %xmm0, %xmm0
 ; SSE-NEXT:    pxor %xmm3, %xmm0
 ; SSE-NEXT:    blendvps %xmm0, %xmm1, %xmm2
 ; SSE-NEXT:    movaps %xmm2, %xmm0
@@ -147,13 +135,14 @@
 ;
 ; AVX-LABEL: combine_vec_uadd_not:
 ; AVX:       # %bb.0:
-; AVX-NEXT:    vpcmpeqd %xmm2, %xmm2, %xmm2
-; AVX-NEXT:    vpxor %xmm2, %xmm0, %xmm0
-; AVX-NEXT:    vpsubd %xmm2, %xmm0, %xmm3
-; AVX-NEXT:    vpmaxud %xmm0, %xmm3, %xmm0
-; AVX-NEXT:    vpcmpeqd %xmm0, %xmm3, %xmm0
-; AVX-NEXT:    vpxor %xmm2, %xmm0, %xmm0
-; AVX-NEXT:    vblendvps %xmm0, %xmm1, %xmm3, %xmm0
+; AVX-NEXT:    vpxor %xmm2, %xmm2, %xmm2
+; AVX-NEXT:    vpsubd %xmm0, %xmm2, %xmm0
+; AVX-NEXT:    vpbroadcastd {{.*#+}} xmm2 = [1,1,1,1]
+; AVX-NEXT:    vpmaxud %xmm2, %xmm0, %xmm2
+; AVX-NEXT:    vpcmpeqd %xmm2, %xmm0, %xmm2
+; AVX-NEXT:    vpcmpeqd %xmm3, %xmm3, %xmm3
+; AVX-NEXT:    vpxor %xmm3, %xmm2, %xmm2
+; AVX-NEXT:    vblendvps %xmm2, %xmm1, %xmm0, %xmm0
 ; AVX-NEXT:    retq
   %1 = xor <4 x i32> %a0, <i32 -1, i32 -1, i32 -1, i32 -1>
   %2 = call {<4 x i32>, <4 x i1>} @llvm.uadd.with.overflow.v4i32(<4 x i32> %1, <4 x i32> <i32 1, i32 1, i32 1, i32 1>)
Index: test/CodeGen/X86/combine-subo.ll
===================================================================
--- test/CodeGen/X86/combine-subo.ll
+++ test/CodeGen/X86/combine-subo.ll
@@ -87,22 +87,10 @@
 define <4 x i32> @combine_vec_usub_zero(<4 x i32> %a0, <4 x i32> %a1) {
 ; SSE-LABEL: combine_vec_usub_zero:
 ; SSE:       # %bb.0:
-; SSE-NEXT:    movdqa %xmm0, %xmm2
-; SSE-NEXT:    pminud %xmm0, %xmm0
-; SSE-NEXT:    pcmpeqd %xmm2, %xmm0
-; SSE-NEXT:    pcmpeqd %xmm3, %xmm3
-; SSE-NEXT:    pxor %xmm3, %xmm0
-; SSE-NEXT:    blendvps %xmm0, %xmm1, %xmm2
-; SSE-NEXT:    movaps %xmm2, %xmm0
 ; SSE-NEXT:    retq
 ;
 ; AVX-LABEL: combine_vec_usub_zero:
 ; AVX:       # %bb.0:
-; AVX-NEXT:    vpminud %xmm0, %xmm0, %xmm2
-; AVX-NEXT:    vpcmpeqd %xmm2, %xmm0, %xmm2
-; AVX-NEXT:    vpcmpeqd %xmm3, %xmm3, %xmm3
-; AVX-NEXT:    vpxor %xmm3, %xmm2, %xmm2
-; AVX-NEXT:    vblendvps %xmm2, %xmm1, %xmm0, %xmm0
 ; AVX-NEXT:    retq
   %1 = call {<4 x i32>, <4 x i1>} @llvm.usub.with.overflow.v4i32(<4 x i32> %a0, <4 x i32> zeroinitializer)
   %2 = extractvalue {<4 x i32>, <4 x i1>} %1, 0
@@ -171,24 +159,12 @@
 define <4 x i32> @combine_vec_usub_self(<4 x i32> %a0, <4 x i32> %a1) {
 ; SSE-LABEL: combine_vec_usub_self:
 ; SSE:       # %bb.0:
-; SSE-NEXT:    movdqa %xmm0, %xmm2
-; SSE-NEXT:    psubd %xmm0, %xmm2
-; SSE-NEXT:    pminud %xmm2, %xmm0
-; SSE-NEXT:    pcmpeqd %xmm2, %xmm0
-; SSE-NEXT:    pcmpeqd %xmm3, %xmm3
-; SSE-NEXT:    pxor %xmm3, %xmm0
-; SSE-NEXT:    blendvps %xmm0, %xmm1, %xmm2
-; SSE-NEXT:    movaps %xmm2, %xmm0
+; SSE-NEXT:    xorps %xmm0, %xmm0
 ; SSE-NEXT:    retq
 ;
 ; AVX-LABEL: combine_vec_usub_self:
 ; AVX:       # %bb.0:
-; AVX-NEXT:    vpsubd %xmm0, %xmm0, %xmm2
-; AVX-NEXT:    vpminud %xmm0, %xmm2, %xmm0
-; AVX-NEXT:    vpcmpeqd %xmm0, %xmm2, %xmm0
-; AVX-NEXT:    vpcmpeqd %xmm3, %xmm3, %xmm3
-; AVX-NEXT:    vpxor %xmm3, %xmm0, %xmm0
-; AVX-NEXT:    vblendvps %xmm0, %xmm1, %xmm2, %xmm0
+; AVX-NEXT:    vxorps %xmm0, %xmm0, %xmm0
 ; AVX-NEXT:    retq
   %1 = call {<4 x i32>, <4 x i1>} @llvm.usub.with.overflow.v4i32(<4 x i32> %a0, <4 x i32> %a0)
   %2 = extractvalue {<4 x i32>, <4 x i1>} %1, 0
@@ -220,25 +196,14 @@
 define <4 x i32> @combine_vec_usub_negone(<4 x i32> %a0, <4 x i32> %a1) {
 ; SSE-LABEL: combine_vec_usub_negone:
 ; SSE:       # %bb.0:
-; SSE-NEXT:    movdqa %xmm0, %xmm2
-; SSE-NEXT:    pcmpeqd %xmm3, %xmm3
-; SSE-NEXT:    pxor %xmm3, %xmm2
-; SSE-NEXT:    movdqa %xmm2, %xmm0
-; SSE-NEXT:    pminud %xmm3, %xmm0
-; SSE-NEXT:    pcmpeqd %xmm2, %xmm0
-; SSE-NEXT:    pxor %xmm3, %xmm0
-; SSE-NEXT:    blendvps %xmm0, %xmm1, %xmm2
-; SSE-NEXT:    movaps %xmm2, %xmm0
+; SSE-NEXT:    pcmpeqd %xmm1, %xmm1
+; SSE-NEXT:    pxor %xmm1, %xmm0
 ; SSE-NEXT:    retq
 ;
 ; AVX-LABEL: combine_vec_usub_negone:
 ; AVX:       # %bb.0:
-; AVX-NEXT:    vpcmpeqd %xmm2, %xmm2, %xmm2
-; AVX-NEXT:    vpxor %xmm2, %xmm0, %xmm0
-; AVX-NEXT:    vpminud %xmm2, %xmm0, %xmm3
-; AVX-NEXT:    vpcmpeqd %xmm3, %xmm0, %xmm3
-; AVX-NEXT:    vpxor %xmm2, %xmm3, %xmm2
-; AVX-NEXT:    vblendvps %xmm2, %xmm1, %xmm0, %xmm0
+; AVX-NEXT:    vpcmpeqd %xmm1, %xmm1, %xmm1
+; AVX-NEXT:    vpxor %xmm1, %xmm0, %xmm0
 ; AVX-NEXT:    retq
   %1 = call {<4 x i32>, <4 x i1>} @llvm.usub.with.overflow.v4i32(<4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>, <4 x i32> %a0)
   %2 = extractvalue {<4 x i32>, <4 x i1>} %1, 0