Index: lib/Target/X86/X86ISelLowering.cpp
===================================================================
--- lib/Target/X86/X86ISelLowering.cpp
+++ lib/Target/X86/X86ISelLowering.cpp
@@ -31828,9 +31828,10 @@
         // Check all uses of the condition operand to check whether it will be
         // consumed by non-BLEND instructions. Those may require that all bits
         // are set properly.
-        for (SDNode *U : Cond->uses()) {
+        for (SDNode::use_iterator UI = Cond->use_begin(), UE = Cond->use_end();
+             UI != UE; ++UI) {
           // TODO: Add other opcodes eventually lowered into BLEND.
-          if (U->getOpcode() != ISD::VSELECT)
+          if (UI->getOpcode() != ISD::VSELECT || UI.getOperandNo() != 0)
             return SDValue();
         }
 
Index: test/CodeGen/X86/pr34592.ll
===================================================================
--- /dev/null
+++ test/CodeGen/X86/pr34592.ll
@@ -0,0 +1,71 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=avx2 -O0 | FileCheck %s
+
+define <16 x i64> @pluto(<16 x i64> %arg, <16 x i64> %arg1, <16 x i64> %arg2, <16 x i64> %arg3, <16 x i64> %arg4) {
+; CHECK-LABEL: pluto:
+; CHECK:       # %bb.0: # %bb
+; CHECK-NEXT:    pushq %rbp
+; CHECK-NEXT:    .cfi_def_cfa_offset 16
+; CHECK-NEXT:    .cfi_offset %rbp, -16
+; CHECK-NEXT:    movq %rsp, %rbp
+; CHECK-NEXT:    .cfi_def_cfa_register %rbp
+; CHECK-NEXT:    andq $-32, %rsp
+; CHECK-NEXT:    subq $288, %rsp # imm = 0x120
+; CHECK-NEXT:    vmovaps 240(%rbp), %ymm8
+; CHECK-NEXT:    vmovaps 208(%rbp), %ymm9
+; CHECK-NEXT:    vmovaps 176(%rbp), %ymm10
+; CHECK-NEXT:    vmovaps 144(%rbp), %ymm11
+; CHECK-NEXT:    vmovaps 112(%rbp), %ymm12
+; CHECK-NEXT:    vmovaps 80(%rbp), %ymm13
+; CHECK-NEXT:    vmovaps 48(%rbp), %ymm14
+; CHECK-NEXT:    vmovaps 16(%rbp), %ymm15
+; CHECK-NEXT:    vmovaps %ymm0, {{[0-9]+}}(%rsp) # 32-byte Spill
+; CHECK-NEXT:    vmovaps {{.*#+}} ymm0 = [0,0,18446744071562067968,18446744071562067968]
+; CHECK-NEXT:    vblendvpd %ymm0, %ymm2, %ymm6, %ymm0
+; CHECK-NEXT:    vxorps %xmm2, %xmm2, %xmm2
+; CHECK-NEXT:    vpblendd {{.*#+}} ymm6 = ymm2[0,1],ymm13[2,3],ymm2[4,5,6,7]
+; CHECK-NEXT:    vpblendd {{.*#+}} ymm2 = ymm2[0,1],ymm8[2,3,4,5,6,7]
+; CHECK-NEXT:    vmovaps {{.*#+}} ymm8 = [18446744071562067968,18446744071562067968,0,0]
+; CHECK-NEXT:    vblendvpd %ymm8, %ymm9, %ymm6, %ymm6
+; CHECK-NEXT:    vpblendd {{.*#+}} ymm8 = ymm15[0,1],ymm11[2,3,4,5,6,7]
+; CHECK-NEXT:    vpalignr {{.*#+}} ymm8 = ymm0[8,9,10,11,12,13,14,15],ymm8[0,1,2,3,4,5,6,7],ymm0[24,25,26,27,28,29,30,31],ymm8[16,17,18,19,20,21,22,23]
+; CHECK-NEXT:    vpermq {{.*#+}} ymm8 = ymm8[2,3,2,0]
+; CHECK-NEXT:    vmovaps %xmm6, %xmm9
+; CHECK-NEXT:    # implicit-def: %ymm11
+; CHECK-NEXT:    vinserti128 $1, %xmm9, %ymm11, %ymm11
+; CHECK-NEXT:    vpblendd {{.*#+}} ymm8 = ymm8[0,1,2,3],ymm11[4,5],ymm8[6,7]
+; CHECK-NEXT:    vmovaps %xmm0, %xmm9
+; CHECK-NEXT:    # implicit-def: %ymm0
+; CHECK-NEXT:    vinserti128 $1, %xmm9, %ymm0, %ymm0
+; CHECK-NEXT:    vpunpcklqdq {{.*#+}} ymm11 = ymm7[0],ymm2[0],ymm7[2],ymm2[2]
+; CHECK-NEXT:    vpermq {{.*#+}} ymm11 = ymm11[2,1,2,3]
+; CHECK-NEXT:    vpblendd {{.*#+}} ymm0 = ymm11[0,1,2,3],ymm0[4,5,6,7]
+; CHECK-NEXT:    vpblendd {{.*#+}} ymm2 = ymm7[0,1],ymm2[2,3],ymm7[4,5,6,7]
+; CHECK-NEXT:    vpermq {{.*#+}} ymm2 = ymm2[2,1,1,3]
+; CHECK-NEXT:    vpshufd {{.*#+}} ymm11 = ymm5[0,1,0,1,4,5,4,5]
+; CHECK-NEXT:    vpblendd {{.*#+}} ymm2 = ymm2[0,1,2,3,4,5],ymm11[6,7]
+; CHECK-NEXT:    vpalignr {{.*#+}} ymm5 = ymm6[8,9,10,11,12,13,14,15],ymm5[0,1,2,3,4,5,6,7],ymm6[24,25,26,27,28,29,30,31],ymm5[16,17,18,19,20,21,22,23]
+; CHECK-NEXT:    vpermq {{.*#+}} ymm5 = ymm5[0,1,0,3]
+; CHECK-NEXT:    vpslldq {{.*#+}} ymm6 = zero,zero,zero,zero,zero,zero,zero,zero,ymm7[0,1,2,3,4,5,6,7],zero,zero,zero,zero,zero,zero,zero,zero,ymm7[16,17,18,19,20,21,22,23]
+; CHECK-NEXT:    vpblendd {{.*#+}} ymm5 = ymm6[0,1,2,3],ymm5[4,5,6,7]
+; CHECK-NEXT:    vmovaps %ymm0, {{[0-9]+}}(%rsp) # 32-byte Spill
+; CHECK-NEXT:    vmovaps %ymm8, %ymm0
+; CHECK-NEXT:    vmovaps %ymm1, {{[0-9]+}}(%rsp) # 32-byte Spill
+; CHECK-NEXT:    vmovaps %ymm2, %ymm1
+; CHECK-NEXT:    vmovaps {{[0-9]+}}(%rsp), %ymm2 # 32-byte Reload
+; CHECK-NEXT:    vmovaps %ymm3, {{[0-9]+}}(%rsp) # 32-byte Spill
+; CHECK-NEXT:    vmovaps %ymm5, %ymm3
+; CHECK-NEXT:    vmovaps %ymm10, {{[0-9]+}}(%rsp) # 32-byte Spill
+; CHECK-NEXT:    vmovaps %ymm12, {{[0-9]+}}(%rsp) # 32-byte Spill
+; CHECK-NEXT:    vmovaps %ymm4, {{[0-9]+}}(%rsp) # 32-byte Spill
+; CHECK-NEXT:    vmovaps %ymm14, (%rsp) # 32-byte Spill
+; CHECK-NEXT:    movq %rbp, %rsp
+; CHECK-NEXT:    popq %rbp
+; CHECK-NEXT:    retq
+bb:
+  %tmp = select <16 x i1> <i1 false, i1 false, i1 false, i1 false, i1 false, i1 false, i1 false, i1 false, i1 false, i1 false, i1 true, i1 true, i1 false, i1 false, i1 false, i1 false>, <16 x i64> %arg, <16 x i64> %arg1
+  %tmp5 = select <16 x i1> <i1 true, i1 false, i1 false, i1 true, i1 true, i1 false, i1 false, i1 true, i1 false, i1 true, i1 false, i1 false, i1 false, i1 false, i1 false, i1 false>, <16 x i64> %arg2, <16 x i64> zeroinitializer
+  %tmp6 = select <16 x i1> <i1 false, i1 true, i1 true, i1 true, i1 false, i1 false, i1 false, i1 false, i1 true, i1 true, i1 false, i1 false, i1 false, i1 true, i1 true, i1 true>, <16 x i64> %arg3, <16 x i64> %tmp5
+  %tmp7 = shufflevector <16 x i64> %tmp, <16 x i64> %tmp6, <16 x i32> <i32 11, i32 18, i32 24, i32 9, i32 14, i32 29, i32 29, i32 6, i32 14, i32 28, i32 8, i32 9, i32 22, i32 12, i32 25, i32 6>
+  ret <16 x i64> %tmp7
+}