xref: /llvm-project/llvm/test/Transforms/InstCombine/select-with-extreme-eq-cond.ll (revision 6f8afafd308d37d9abc4af0801dd5a4451c13718)

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt < %s -passes=instcombine -S | FileCheck %s

define i1 @compare_unsigned_min(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @compare_unsigned_min(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[TMP2:%.*]] = icmp ult i8 [[X]], [[Y]]
; CHECK-NEXT:    ret i1 [[TMP2]]
;
start:
  %cmp1 = icmp eq i8 %x, 0
  %cmp2 = icmp ne i8 %y, 0
  %cmp3 = icmp ult i8 %x, %y
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @compare_signed_min(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @compare_signed_min(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[TMP4:%.*]] = icmp slt i8 [[X]], [[Y]]
; CHECK-NEXT:    ret i1 [[TMP4]]
;
start:
  %cmp1 = icmp eq i8 %x, -128
  %cmp2 = icmp ne i8 %y, -128
  %cmp3 = icmp slt i8 %x, %y
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @compare_unsigned_max(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @compare_unsigned_max(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[TMP4:%.*]] = icmp ugt i8 [[X]], [[Y]]
; CHECK-NEXT:    ret i1 [[TMP4]]
;
start:
  %cmp1 = icmp eq i8 %x, 255
  %cmp2 = icmp ne i8 %y, 255
  %cmp3 = icmp ugt i8 %x, %y
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @compare_signed_max(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @compare_signed_max(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[TMP4:%.*]] = icmp sgt i8 [[X]], [[Y]]
; CHECK-NEXT:    ret i1 [[TMP4]]
;
start:
  %cmp1 = icmp eq i8 %x, 127
  %cmp2 = icmp ne i8 %y, 127
  %cmp3 = icmp sgt i8 %x, %y
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @relational_cmp_unsigned_min(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @relational_cmp_unsigned_min(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[TMP4:%.*]] = icmp ult i8 [[X]], [[Y]]
; CHECK-NEXT:    ret i1 [[TMP4]]
;
start:
  %cmp1 = icmp ule i8 %x, 0
  %cmp2 = icmp ugt i8 %y, 0
  %cmp3 = icmp ult i8 %x, %y
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @relational_cmp_signed_min(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @relational_cmp_signed_min(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[TMP4:%.*]] = icmp slt i8 [[X]], [[Y]]
; CHECK-NEXT:    ret i1 [[TMP4]]
;
start:
  %cmp1 = icmp sle i8 %x, -128
  %cmp2 = icmp sgt i8 %y, -128
  %cmp3 = icmp slt i8 %x, %y
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @relational_cmp_unsigned_max(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @relational_cmp_unsigned_max(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[TMP4:%.*]] = icmp ugt i8 [[X]], [[Y]]
; CHECK-NEXT:    ret i1 [[TMP4]]
;
start:
  %cmp1 = icmp uge i8 %x, 255
  %cmp2 = icmp ult i8 %y, 255
  %cmp3 = icmp ugt i8 %x, %y
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @relational_cmp_signed_max(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @relational_cmp_signed_max(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[TMP4:%.*]] = icmp sgt i8 [[X]], [[Y]]
; CHECK-NEXT:    ret i1 [[TMP4]]
;
start:
  %cmp1 = icmp sge i8 %x, 127
  %cmp2 = icmp slt i8 %y, 127
  %cmp3 = icmp sgt i8 %x, %y
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

declare void @use(i1)

define i1 @compare_signed_max_multiuse(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @compare_signed_max_multiuse(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[TMP4:%.*]] = icmp sgt i8 [[X]], [[Y]]
; CHECK-NEXT:    call void @use(i1 [[TMP4]])
; CHECK-NEXT:    [[RESULT:%.*]] = icmp sgt i8 [[X]], [[Y]]
; CHECK-NEXT:    ret i1 [[RESULT]]
;
start:
  %cmp1 = icmp eq i8 %x, 127
  %cmp2 = icmp ne i8 %y, 127
  %cmp3 = icmp sgt i8 %x, %y
  call void @use(i1 %cmp3)
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @compare_signed_min_samesign(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @compare_signed_min_samesign(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[RESULT:%.*]] = icmp slt i8 [[X]], [[Y]]
; CHECK-NEXT:    ret i1 [[RESULT]]
;
start:
  %cmp1 = icmp eq i8 %x, -128
  %cmp2 = icmp ne i8 %y, -128
  %cmp3 = icmp samesign slt i8 %x, %y
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @compare_flipped(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @compare_flipped(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[RESULT:%.*]] = icmp ult i8 [[X]], [[Y]]
; CHECK-NEXT:    ret i1 [[RESULT]]
;
start:
  %cmp1 = icmp eq i8 %x, 0
  %cmp2 = icmp ne i8 %y, 0
  %cmp3 = icmp ugt i8 %y, %x
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @compare_swapped(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @compare_swapped(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[RESULT:%.*]] = icmp ult i8 [[X]], [[Y]]
; CHECK-NEXT:    ret i1 [[RESULT]]
;
start:
  %cmp1 = icmp ne i8 %x, 0
  %cmp2 = icmp ne i8 %y, 0
  %cmp3 = icmp ult i8 %x, %y
  %result = select i1 %cmp1, i1 %cmp3, i1 %cmp2
  ret i1 %result
}

define i1 @compare_swapped_flipped_unsigned_max(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @compare_swapped_flipped_unsigned_max(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[RESULT:%.*]] = icmp ugt i8 [[X]], [[Y]]
; CHECK-NEXT:    ret i1 [[RESULT]]
;
start:
  %cmp1 = icmp ne i8 %x, 255
  %cmp2 = icmp ne i8 %y, 255
  %cmp3 = icmp ult i8 %y, %x
  %result = select i1 %cmp1, i1 %cmp3, i1 %cmp2
  ret i1 %result
}

define i1 @compare_unsigned_min_illegal_type(i9 %x, i9 %y) {
; CHECK-LABEL: define i1 @compare_unsigned_min_illegal_type(
; CHECK-SAME: i9 [[X:%.*]], i9 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[TMP2:%.*]] = icmp ult i9 [[X]], [[Y]]
; CHECK-NEXT:    ret i1 [[TMP2]]
;
start:
  %cmp1 = icmp eq i9 %x, 0
  %cmp2 = icmp ne i9 %y, 0
  %cmp3 = icmp ult i9 %x, %y
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @compare_true_poison(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @compare_true_poison(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[CMP3:%.*]] = icmp ult i8 [[X]], [[Y]]
; CHECK-NEXT:    ret i1 [[CMP3]]
;
start:
  %cmp1 = icmp eq i8 %x, 0
  %cmp2 = icmp ne i8 %y, 0
  %cmp3 = icmp ult i8 %x, %y
  %result = select i1 %cmp1, i1 poison, i1 %cmp3
  ret i1 %result
}

define <2 x i1> @compare_vector(<2 x i8> %x, <2 x i8> %y) {
; CHECK-LABEL: define <2 x i1> @compare_vector(
; CHECK-SAME: <2 x i8> [[X:%.*]], <2 x i8> [[Y:%.*]]) {
; CHECK-NEXT:    [[TMP1:%.*]] = icmp ult <2 x i8> [[X]], [[Y]]
; CHECK-NEXT:    ret <2 x i1> [[TMP1]]
;
  %cmp1 = icmp eq <2 x i8> %x, zeroinitializer
  %cmp2 = icmp ne <2 x i8> %y, zeroinitializer
  %cmp3 = icmp ult <2 x i8> %x, %y
  %result = select <2 x i1> %cmp1, <2 x i1> %cmp2, <2 x i1> %cmp3
  ret <2 x i1> %result
}

define i1 @compare_pointer_negative(ptr %x, ptr %y) {
; CHECK-LABEL: define i1 @compare_pointer_negative(
; CHECK-SAME: ptr [[X:%.*]], ptr [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq ptr [[X]], inttoptr (i8 127 to ptr)
; CHECK-NEXT:    [[TMP3:%.*]] = icmp ne ptr [[Y]], inttoptr (i8 127 to ptr)
; CHECK-NEXT:    [[TMP4:%.*]] = icmp sgt ptr [[X]], [[Y]]
; CHECK-NEXT:    [[RESULT:%.*]] = select i1 [[TMP2]], i1 [[TMP3]], i1 [[TMP4]]
; CHECK-NEXT:    ret i1 [[RESULT]]
;
start:
  %X = inttoptr i8 127 to ptr
  %cmp1 = icmp eq ptr %x, %X
  %cmp2 = icmp ne ptr %y, %X
  %cmp3 = icmp sgt ptr %x, %y
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @compare_float_negative(half %x, half %y) {
; CHECK-LABEL: define i1 @compare_float_negative(
; CHECK-SAME: half [[X:%.*]], half [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[TMP2:%.*]] = fcmp oeq half [[X]], 0xH0000
; CHECK-NEXT:    [[TMP3:%.*]] = fcmp one half [[Y]], 0xH0000
; CHECK-NEXT:    [[TMP4:%.*]] = fcmp ult half [[X]], [[Y]]
; CHECK-NEXT:    [[RESULT:%.*]] = select i1 [[TMP2]], i1 [[TMP3]], i1 [[TMP4]]
; CHECK-NEXT:    ret i1 [[RESULT]]
;
start:
  %cmp1 = fcmp oeq half %x, 0.0
  %cmp2 = fcmp one half %y, 0.0
  %cmp3 = fcmp ult half %x, %y
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @compare_unsigned_max_swapped_lhs_rhs_negative(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @compare_unsigned_max_swapped_lhs_rhs_negative(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq i8 [[X]], -1
; CHECK-NEXT:    [[DOTNOT:%.*]] = icmp ne i8 [[Y]], -1
; CHECK-NEXT:    [[RESULT:%.*]] = select i1 [[DOTNOT]], i1 [[TMP2]], i1 false
; CHECK-NEXT:    ret i1 [[RESULT]]
;
start:
  %cmp1 = icmp eq i8 %x, 255
  %cmp2 = icmp ne i8 %y, 255
  %cmp3 = icmp ugt i8 %x, %y
  %result = select i1 %cmp2, i1 %cmp1, i1 %cmp3
  ret i1 %result
}

define i1 @compare_signed_min_negative(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @compare_signed_min_negative(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq i8 [[X]], -127
; CHECK-NEXT:    [[TMP3:%.*]] = icmp ne i8 [[Y]], -127
; CHECK-NEXT:    [[TMP4:%.*]] = icmp slt i8 [[X]], [[Y]]
; CHECK-NEXT:    [[RESULT:%.*]] = select i1 [[TMP2]], i1 [[TMP3]], i1 [[TMP4]]
; CHECK-NEXT:    ret i1 [[RESULT]]
;
start:
  %cmp1 = icmp eq i8 %x, -127
  %cmp2 = icmp ne i8 %y, -127
  %cmp3 = icmp slt i8 %x, %y
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @compare_unsigned_max_negative(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @compare_unsigned_max_negative(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq i8 [[X]], -1
; CHECK-NEXT:    [[TMP3:%.*]] = icmp ne i8 [[Y]], -1
; CHECK-NEXT:    [[TMP4:%.*]] = icmp ult i8 [[X]], [[Y]]
; CHECK-NEXT:    [[RESULT:%.*]] = select i1 [[TMP2]], i1 [[TMP3]], i1 [[TMP4]]
; CHECK-NEXT:    ret i1 [[RESULT]]
;
start:
  %cmp1 = icmp eq i8 %x, 255
  %cmp2 = icmp ne i8 %y, 255
  %cmp3 = icmp ult i8 %x, %y
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @non_strict_op_negative(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @non_strict_op_negative(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq i8 [[X]], 0
; CHECK-NEXT:    [[TMP3:%.*]] = icmp ne i8 [[Y]], 0
; CHECK-NEXT:    [[TMP4:%.*]] = icmp ule i8 [[X]], [[Y]]
; CHECK-NEXT:    [[RESULT:%.*]] = select i1 [[TMP2]], i1 [[TMP3]], i1 [[TMP4]]
; CHECK-NEXT:    ret i1 [[RESULT]]
;
start:
  %cmp1 = icmp eq i8 %x, 0
  %cmp2 = icmp ne i8 %y, 0
  %cmp3 = icmp ule i8 %x, %y
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @compare_poison_negative(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @compare_poison_negative(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[CMP2:%.*]] = icmp ne i8 [[Y]], 0
; CHECK-NEXT:    ret i1 [[CMP2]]
;
start:
  %cmp1 = icmp eq i8 %x, 0
  %cmp2 = icmp ne i8 %y, 0
  %result = select i1 %cmp1, i1 %cmp2, i1 poison
  ret i1 %result
}

define i1 @mismatched_cond_lhs_negative(i8 %x, i8 %y, i8 %z) {
; CHECK-LABEL: define i1 @mismatched_cond_lhs_negative(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]], i8 [[Z:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[CMP1:%.*]] = icmp eq i8 [[X]], 0
; CHECK-NEXT:    [[CMP2:%.*]] = icmp ne i8 [[Y]], 0
; CHECK-NEXT:    [[CMP3:%.*]] = icmp ult i8 [[Z]], [[Y]]
; CHECK-NEXT:    [[RESULT:%.*]] = select i1 [[CMP1]], i1 [[CMP2]], i1 [[CMP3]]
; CHECK-NEXT:    ret i1 [[RESULT]]
;
start:
  %cmp1 = icmp eq i8 %x, 0
  %cmp2 = icmp ne i8 %y, 0
  %cmp3 = icmp ult i8 %z, %y
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @mismatched_trueval_lhs_negative(i8 %x, i8 %y, i8 %z) {
; CHECK-LABEL: define i1 @mismatched_trueval_lhs_negative(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]], i8 [[Z:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[CMP1:%.*]] = icmp eq i8 [[X]], 0
; CHECK-NEXT:    [[CMP2:%.*]] = icmp ne i8 [[Y]], 0
; CHECK-NEXT:    [[CMP3:%.*]] = icmp ult i8 [[X]], [[Z]]
; CHECK-NEXT:    [[RESULT:%.*]] = select i1 [[CMP1]], i1 [[CMP2]], i1 [[CMP3]]
; CHECK-NEXT:    ret i1 [[RESULT]]
;
start:
  %cmp1 = icmp eq i8 %x, 0
  %cmp2 = icmp ne i8 %y, 0
  %cmp3 = icmp ult i8 %x, %z
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @mismatched_constant_negative(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @mismatched_constant_negative(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[CMP1:%.*]] = icmp eq i8 [[X]], 0
; CHECK-NEXT:    [[CMP2:%.*]] = icmp ne i8 [[Y]], 2
; CHECK-NEXT:    [[CMP3:%.*]] = icmp ult i8 [[X]], [[Y]]
; CHECK-NEXT:    [[RESULT:%.*]] = select i1 [[CMP1]], i1 [[CMP2]], i1 [[CMP3]]
; CHECK-NEXT:    ret i1 [[RESULT]]
;
start:
  %cmp1 = icmp eq i8 %x, 0
  %cmp2 = icmp ne i8 %y, 2
  %cmp3 = icmp ult i8 %x, %y
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @mismatched_constant_two_negative(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @mismatched_constant_two_negative(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[CMP1:%.*]] = icmp eq i8 [[X]], 2
; CHECK-NEXT:    [[CMP2:%.*]] = icmp ne i8 [[Y]], 0
; CHECK-NEXT:    [[CMP3:%.*]] = icmp ult i8 [[X]], [[Y]]
; CHECK-NEXT:    [[RESULT:%.*]] = select i1 [[CMP1]], i1 [[CMP2]], i1 [[CMP3]]
; CHECK-NEXT:    ret i1 [[RESULT]]
;
start:
  %cmp1 = icmp eq i8 %x, 2
  %cmp2 = icmp ne i8 %y, 0
  %cmp3 = icmp ult i8 %x, %y
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}

define i1 @compare_eq_eq_negative(i8 %x, i8 %y) {
; CHECK-LABEL: define i1 @compare_eq_eq_negative(
; CHECK-SAME: i8 [[X:%.*]], i8 [[Y:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[CMP1:%.*]] = icmp eq i8 [[X]], 0
; CHECK-NEXT:    [[CMP2:%.*]] = icmp eq i8 [[Y]], 0
; CHECK-NEXT:    [[CMP3:%.*]] = icmp ult i8 [[X]], [[Y]]
; CHECK-NEXT:    [[RESULT:%.*]] = select i1 [[CMP1]], i1 [[CMP2]], i1 [[CMP3]]
; CHECK-NEXT:    ret i1 [[RESULT]]
;
start:
  %cmp1 = icmp eq i8 %x, 0
  %cmp2 = icmp eq i8 %y, 0
  %cmp3 = icmp ult i8 %x, %y
  %result = select i1 %cmp1, i1 %cmp2, i1 %cmp3
  ret i1 %result
}