--- /dev/null
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+define i1 @eq_zero(i4 %x, i4 %y) {
+; CHECK-LABEL: @eq_zero(
+; CHECK-NEXT: [[I0:%.*]] = icmp eq i4 [[X:%.*]], 0
+; CHECK-NEXT: [[I1:%.*]] = icmp eq i4 [[Y:%.*]], 0
+; CHECK-NEXT: [[R:%.*]] = xor i1 [[I0]], [[I1]]
+; CHECK-NEXT: ret i1 [[R]]
+;
+ %i0 = icmp eq i4 %x, 0
+ %i1 = icmp eq i4 %y, 0
+ %r = xor i1 %i0, %i1
+ ret i1 %r
+}
+
+define i1 @ne_zero(i4 %x, i4 %y) {
+; CHECK-LABEL: @ne_zero(
+; CHECK-NEXT: [[I0:%.*]] = icmp ne i4 [[X:%.*]], 0
+; CHECK-NEXT: [[I1:%.*]] = icmp ne i4 [[Y:%.*]], 0
+; CHECK-NEXT: [[R:%.*]] = xor i1 [[I0]], [[I1]]
+; CHECK-NEXT: ret i1 [[R]]
+;
+ %i0 = icmp ne i4 %x, 0
+ %i1 = icmp ne i4 %y, 0
+ %r = xor i1 %i0, %i1
+ ret i1 %r
+}
+
+define i1 @eq_ne_zero(i4 %x, i4 %y) {
+; CHECK-LABEL: @eq_ne_zero(
+; CHECK-NEXT: [[I0:%.*]] = icmp eq i4 [[X:%.*]], 0
+; CHECK-NEXT: [[I1:%.*]] = icmp ne i4 [[Y:%.*]], 0
+; CHECK-NEXT: [[R:%.*]] = xor i1 [[I0]], [[I1]]
+; CHECK-NEXT: ret i1 [[R]]
+;
+ %i0 = icmp eq i4 %x, 0
+ %i1 = icmp ne i4 %y, 0
+ %r = xor i1 %i0, %i1
+ ret i1 %r
+}
+
+define i1 @slt_zero(i4 %x, i4 %y) {
+; CHECK-LABEL: @slt_zero(
+; CHECK-NEXT: [[I0:%.*]] = icmp slt i4 [[X:%.*]], 0
+; CHECK-NEXT: [[I1:%.*]] = icmp slt i4 [[Y:%.*]], 0
+; CHECK-NEXT: [[R:%.*]] = xor i1 [[I0]], [[I1]]
+; CHECK-NEXT: ret i1 [[R]]
+;
+ %i0 = icmp slt i4 %x, 0
+ %i1 = icmp slt i4 %y, 0
+ %r = xor i1 %i0, %i1
+ ret i1 %r
+}
+
+define i1 @sgt_zero(i4 %x, i4 %y) {
+; CHECK-LABEL: @sgt_zero(
+; CHECK-NEXT: [[I0:%.*]] = icmp sgt i4 [[X:%.*]], 0
+; CHECK-NEXT: [[I1:%.*]] = icmp sgt i4 [[Y:%.*]], 0
+; CHECK-NEXT: [[R:%.*]] = xor i1 [[I0]], [[I1]]
+; CHECK-NEXT: ret i1 [[R]]
+;
+ %i0 = icmp sgt i4 %x, 0
+ %i1 = icmp sgt i4 %y, 0
+ %r = xor i1 %i0, %i1
+ ret i1 %r
+}
+
+define i1 @sgt_minus1(i4 %x, i4 %y) {
+; CHECK-LABEL: @sgt_minus1(
+; CHECK-NEXT: [[I0:%.*]] = icmp sgt i4 [[X:%.*]], -1
+; CHECK-NEXT: [[I1:%.*]] = icmp sgt i4 [[Y:%.*]], -1
+; CHECK-NEXT: [[R:%.*]] = xor i1 [[I0]], [[I1]]
+; CHECK-NEXT: ret i1 [[R]]
+;
+ %i0 = icmp sgt i4 %x, -1
+ %i1 = icmp sgt i4 %y, -1
+ %r = xor i1 %i0, %i1
+ ret i1 %r
+}
+
+define i1 @slt_zero_sgt_minus1(i4 %x, i4 %y) {
+; CHECK-LABEL: @slt_zero_sgt_minus1(
+; CHECK-NEXT: [[I0:%.*]] = icmp slt i4 [[X:%.*]], 0
+; CHECK-NEXT: [[I1:%.*]] = icmp sgt i4 [[Y:%.*]], -1
+; CHECK-NEXT: [[R:%.*]] = xor i1 [[I0]], [[I1]]
+; CHECK-NEXT: ret i1 [[R]]
+;
+ %i0 = icmp slt i4 %x, 0
+ %i1 = icmp sgt i4 %y, -1
+ %r = xor i1 %i0, %i1
+ ret i1 %r
+}
+
+define <2 x i1> @sgt_minus1_slt_zero_sgt(<2 x i4> %x, <2 x i4> %y) {
+; CHECK-LABEL: @sgt_minus1_slt_zero_sgt(
+; CHECK-NEXT: [[I1:%.*]] = icmp sgt <2 x i4> [[X:%.*]], <i4 -1, i4 -1>
+; CHECK-NEXT: [[I0:%.*]] = icmp slt <2 x i4> [[Y:%.*]], zeroinitializer
+; CHECK-NEXT: [[R:%.*]] = xor <2 x i1> [[I0]], [[I1]]
+; CHECK-NEXT: ret <2 x i1> [[R]]
+;
+ %i1 = icmp sgt <2 x i4> %x, <i4 -1, i4 -1>
+ %i0 = icmp slt <2 x i4> %y, zeroinitializer
+ %r = xor <2 x i1> %i0, %i1
+ ret <2 x i1> %r
+}
+
+define i1 @test13(i8 %A, i8 %B) {
+; CHECK-LABEL: @test13(
+; CHECK-NEXT: [[TMP1:%.*]] = icmp ne i8 [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT: ret i1 [[TMP1]]
+;
+ %C = icmp ult i8 %A, %B
+ %D = icmp ugt i8 %A, %B
+ %E = xor i1 %C, %D
+ ret i1 %E
+}
+
+define i1 @test14(i8 %A, i8 %B) {
+; CHECK-LABEL: @test14(
+; CHECK-NEXT: ret i1 true
+;
+ %C = icmp eq i8 %A, %B
+ %D = icmp ne i8 %B, %A
+ %E = xor i1 %C, %D
+ ret i1 %E
+}
+