diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 955cdce5508..1c629ed3164 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -15456,8 +15456,11 @@ SDValue X86TargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const {
       cast<ConstantSDNode>(Op1)->isNullValue() &&
       (CC == ISD::SETEQ || CC == ISD::SETNE)) {
     SDValue NewSetCC = LowerToBT(Op0, CC, dl, DAG);
-    if (NewSetCC.getNode())
+    if (NewSetCC.getNode()) {
+      if (VT == MVT::i1)
+        return DAG.getNode(ISD::TRUNCATE, dl, MVT::i1, NewSetCC);
       return NewSetCC;
+    }
   }
 
   // Look for X == 0, X == 1, X != 0, or X != 1.  We can simplify some forms of
diff --git a/test/CodeGen/X86/avx512-i1test.ll b/test/CodeGen/X86/avx512-i1test.ll
new file mode 100755
index 00000000000..4814314a644
--- /dev/null
+++ b/test/CodeGen/X86/avx512-i1test.ll
@@ -0,0 +1,45 @@
+; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=knl | FileCheck %s
+
+; ModuleID = 'bugpoint-reduced-simplified.bc'
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+; CHECK-LABEL: func
+; CHECK: kortestw
+; CHECK: kortestw
+define void @func() {
+bb1:
+  br i1 undef, label %L_10, label %L_10
+
+L_10:                                             ; preds = %bb1, %bb1
+  br i1 undef, label %L_30, label %bb56
+
+bb56:                                             ; preds = %L_10
+  br label %bb33
+
+bb33:                                             ; preds = %bb51, %bb56
+  %r111 = load i64* undef, align 8
+  br i1 undef, label %bb51, label %bb35
+
+bb35:                                             ; preds = %bb33
+  br i1 undef, label %L_19, label %bb37
+
+bb37:                                             ; preds = %bb35
+  %r128 = and i64 %r111, 576460752303423488
+  %phitmp = icmp eq i64 %r128, 0
+  br label %L_19
+
+L_19:                                             ; preds = %bb37, %bb35
+  %"$V_S25.0" = phi i1 [ %phitmp, %bb37 ], [ true, %bb35 ]
+  br i1 undef, label %bb51, label %bb42
+
+bb42:                                             ; preds = %L_19
+  %r136 = select i1 %"$V_S25.0", i32* undef, i32* undef
+  br label %bb51
+
+bb51:                                             ; preds = %bb42, %L_19, %bb33
+  br i1 false, label %L_30, label %bb33
+
+L_30:                                             ; preds = %bb51, %L_10
+  ret void
+}