Index: lib/CodeGen/SelectionDAG/SelectionDAG.cpp
===================================================================
--- lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -4145,6 +4145,13 @@
     break;
   case ISD::VECTOR_SHUFFLE:
     llvm_unreachable("should use getVectorShuffle constructor!");
+  case ISD::INSERT_VECTOR_ELT: {
+    ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N3);
+    // INSERT_VECTOR_ELT into out-of-bounds element is an UNDEF
+    if (N3C && N3C->getZExtValue() >= N1.getValueType().getVectorNumElements())
+      return getUNDEF(VT);
+    break;
+  }
   case ISD::INSERT_SUBVECTOR: {
     SDValue Index = N3;
     if (VT.isSimple() && N1.getValueType().isSimple()
Index: test/CodeGen/PowerPC/vec_add_sub_quadword.ll
===================================================================
--- test/CodeGen/PowerPC/vec_add_sub_quadword.ll
+++ test/CodeGen/PowerPC/vec_add_sub_quadword.ll
@@ -19,11 +19,13 @@
 
 define <1 x i128> @increment_by_val(<1 x i128> %x, i128 %val) nounwind {
        %tmpvec = insertelement <1 x i128> <i128 0>, i128 %val, i32 0
+        ; undef
        %tmpvec2 = insertelement <1 x i128> %tmpvec, i128 %val, i32 1
        %result = add <1 x i128> %x, %tmpvec2
        ret <1 x i128> %result
 ; CHECK-LABEL: @increment_by_val
-; CHECK: vadduqm 2, 2, 3
+; CHECK: # BB#0:
+; CHECK-NEXT: blr
 }
 
 define <1 x i128> @test_sub(<1 x i128> %x, <1 x i128> %y) nounwind {
@@ -42,32 +44,34 @@
 
 define <1 x i128> @decrement_by_val(<1 x i128> %x, i128 %val) nounwind {
        %tmpvec = insertelement <1 x i128> <i128 0>, i128 %val, i32 0
+       ; undef
        %tmpvec2 = insertelement <1 x i128> %tmpvec, i128 %val, i32 1
        %result = sub <1 x i128> %x, %tmpvec2
        ret <1 x i128> %result
 ; CHECK-LABEL: @decrement_by_val
-; CHECK: vsubuqm   2, 2, 3
+; CHECK: # BB#0:
+; CHECK-NEXT: blr
 }
 
-declare <1 x i128> @llvm.ppc.altivec.vaddeuqm(<1 x i128> %x, 
-                                              <1 x i128> %y, 
+declare <1 x i128> @llvm.ppc.altivec.vaddeuqm(<1 x i128> %x,
+                                              <1 x i128> %y,
                                               <1 x i128> %z) nounwind readnone
-declare <1 x i128> @llvm.ppc.altivec.vaddcuq(<1 x i128> %x, 
+declare <1 x i128> @llvm.ppc.altivec.vaddcuq(<1 x i128> %x,
                                              <1 x i128> %y) nounwind readnone
-declare <1 x i128> @llvm.ppc.altivec.vaddecuq(<1 x i128> %x, 
-                                              <1 x i128> %y, 
+declare <1 x i128> @llvm.ppc.altivec.vaddecuq(<1 x i128> %x,
+                                              <1 x i128> %y,
                                               <1 x i128> %z) nounwind readnone
-declare <1 x i128> @llvm.ppc.altivec.vsubeuqm(<1 x i128> %x, 
-                                              <1 x i128> %y, 
+declare <1 x i128> @llvm.ppc.altivec.vsubeuqm(<1 x i128> %x,
+                                              <1 x i128> %y,
                                               <1 x i128> %z) nounwind readnone
-declare <1 x i128> @llvm.ppc.altivec.vsubcuq(<1 x i128> %x, 
+declare <1 x i128> @llvm.ppc.altivec.vsubcuq(<1 x i128> %x,
                                              <1 x i128> %y) nounwind readnone
-declare <1 x i128> @llvm.ppc.altivec.vsubecuq(<1 x i128> %x, 
-                                              <1 x i128> %y, 
+declare <1 x i128> @llvm.ppc.altivec.vsubecuq(<1 x i128> %x,
+                                              <1 x i128> %y,
                                               <1 x i128> %z) nounwind readnone
 
-define <1 x i128> @test_vaddeuqm(<1 x i128> %x, 
-       	    	                 <1 x i128> %y, 
+define <1 x i128> @test_vaddeuqm(<1 x i128> %x,
+       	    	                 <1 x i128> %y,
                                  <1 x i128> %z) nounwind {
   %tmp = tail call <1 x i128> @llvm.ppc.altivec.vaddeuqm(<1 x i128> %x,
                                                          <1 x i128> %y,
@@ -77,7 +81,7 @@
 ; CHECK: vaddeuqm 2, 2, 3, 4
 }
 
-define <1 x i128> @test_vaddcuq(<1 x i128> %x, 
+define <1 x i128> @test_vaddcuq(<1 x i128> %x,
        	    	                <1 x i128> %y) nounwind {
   %tmp = tail call <1 x i128> @llvm.ppc.altivec.vaddcuq(<1 x i128> %x,
                                                         <1 x i128> %y)
@@ -86,8 +90,8 @@
 ; CHECK: vaddcuq 2, 2, 3
 }
 
-define <1 x i128> @test_vaddecuq(<1 x i128> %x, 
-       	    	                 <1 x i128> %y, 
+define <1 x i128> @test_vaddecuq(<1 x i128> %x,
+       	    	                 <1 x i128> %y,
                                  <1 x i128> %z) nounwind {
   %tmp = tail call <1 x i128> @llvm.ppc.altivec.vaddecuq(<1 x i128> %x,
                                                          <1 x i128> %y,
@@ -97,8 +101,8 @@
 ; CHECK: vaddecuq 2, 2, 3, 4
 }
 
-define <1 x i128> @test_vsubeuqm(<1 x i128> %x, 
-       	    	                 <1 x i128> %y, 
+define <1 x i128> @test_vsubeuqm(<1 x i128> %x,
+       	    	                 <1 x i128> %y,
                                  <1 x i128> %z) nounwind {
   %tmp = tail call <1 x i128> @llvm.ppc.altivec.vsubeuqm(<1 x i128> %x,
                                                          <1 x i128> %y,
@@ -108,7 +112,7 @@
 ; CHECK: vsubeuqm 2, 2, 3, 4
 }
 
-define <1 x i128> @test_vsubcuq(<1 x i128> %x, 
+define <1 x i128> @test_vsubcuq(<1 x i128> %x,
        	    	                <1 x i128> %y) nounwind {
   %tmp = tail call <1 x i128> @llvm.ppc.altivec.vsubcuq(<1 x i128> %x,
                                                         <1 x i128> %y)
@@ -117,8 +121,8 @@
 ; CHECK: vsubcuq 2, 2, 3
 }
 
-define <1 x i128> @test_vsubecuq(<1 x i128> %x, 
-       	    	                 <1 x i128> %y, 
+define <1 x i128> @test_vsubecuq(<1 x i128> %x,
+       	    	                 <1 x i128> %y,
                                  <1 x i128> %z) nounwind {
   %tmp = tail call <1 x i128> @llvm.ppc.altivec.vsubecuq(<1 x i128> %x,
                                                          <1 x i128> %y,
Index: test/CodeGen/X86/avx512-insert-extract.ll
===================================================================
--- test/CodeGen/X86/avx512-insert-extract.ll
+++ test/CodeGen/X86/avx512-insert-extract.ll
@@ -727,18 +727,18 @@
 define <2 x i64> @insert_v2i64(<2 x i64> %x, i64 %y , i64* %ptr) {
 ; KNL-LABEL: insert_v2i64:
 ; KNL:       ## BB#0:
+; KNL-NEXT:    vpinsrq $0, %rdi, %xmm0, %xmm0
 ; KNL-NEXT:    vpinsrq $1, (%rsi), %xmm0, %xmm0
-; KNL-NEXT:    vpinsrq $3, %rdi, %xmm0, %xmm0
 ; KNL-NEXT:    retq
 ;
 ; SKX-LABEL: insert_v2i64:
 ; SKX:       ## BB#0:
+; SKX-NEXT:    vpinsrq $0, %rdi, %xmm0, %xmm0
 ; SKX-NEXT:    vpinsrq $1, (%rsi), %xmm0, %xmm0
-; SKX-NEXT:    vpinsrq $3, %rdi, %xmm0, %xmm0
 ; SKX-NEXT:    retq
   %val = load i64, i64* %ptr
   %r1 = insertelement <2 x i64> %x, i64 %val, i32 1
-  %r2 = insertelement <2 x i64> %r1, i64 %y, i32 3
+  %r2 = insertelement <2 x i64> %r1, i64 %y, i32 0
   ret <2 x i64> %r2
 }