test/Transforms/LoopVectorize/constantfolder.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 5
; RUN: opt -passes=loop-vectorize -force-vector-width=4 -S %s | FileCheck %s

define void @const_fold_ptradd(ptr %dst, i64 %d) {
; CHECK-LABEL: define void @const_fold_ptradd(
; CHECK-SAME: ptr [[DST:%.*]], i64 [[D:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    store i16 0, ptr [[DST]], align 2
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[TMP1:%.*]] = icmp eq i64 [[INDEX_NEXT]], 100
; CHECK-NEXT:    br i1 [[TMP1]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    br label %[[EXIT:.*]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ]
; CHECK-NEXT:    br label %[[LOOP_HEADER:.*]]
; CHECK:       [[LOOP_HEADER]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; CHECK-NEXT:    br i1 true, label %[[LOOP_LATCH]], label %[[ELSE:.*]]
; CHECK:       [[ELSE]]:
; CHECK-NEXT:    br label %[[LOOP_LATCH]]
; CHECK:       [[LOOP_LATCH]]:
; CHECK-NEXT:    [[CONST_0:%.*]] = phi i64 [ [[D]], %[[ELSE]] ], [ 0, %[[LOOP_HEADER]] ]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i16, ptr [[DST]], i64 [[CONST_0]]
; CHECK-NEXT:    store i16 0, ptr [[GEP]], align 2
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp ult i64 [[IV_NEXT]], 100
; CHECK-NEXT:    br i1 [[CMP]], label %[[LOOP_HEADER]], label %[[EXIT]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop.header

loop.header:                                         ; preds = %loop.latch, %entry
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
  br i1 true, label %loop.latch, label %else

else:
  br label %loop.latch

loop.latch:
  %const.0 = phi i64 [ %d, %else ], [ 0, %loop.header ]
  %gep = getelementptr i16, ptr %dst, i64 %const.0
  store i16 0, ptr %gep, align 2
  %iv.next = add i64 %iv, 1
  %cmp = icmp ult i64 %iv.next, 100
  br i1 %cmp, label %loop.header, label %exit

exit:
  ret void
}

define void @const_fold_inbounds_ptradd(ptr %dst, i64 %d) {
; CHECK-LABEL: define void @const_fold_inbounds_ptradd(
; CHECK-SAME: ptr [[DST:%.*]], i64 [[D:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    store i16 0, ptr [[DST]], align 2
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[TMP1:%.*]] = icmp eq i64 [[INDEX_NEXT]], 100
; CHECK-NEXT:    br i1 [[TMP1]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    br label %[[EXIT:.*]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ]
; CHECK-NEXT:    br label %[[LOOP_HEADER:.*]]
; CHECK:       [[LOOP_HEADER]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; CHECK-NEXT:    br i1 true, label %[[LOOP_LATCH]], label %[[ELSE:.*]]
; CHECK:       [[ELSE]]:
; CHECK-NEXT:    br label %[[LOOP_LATCH]]
; CHECK:       [[LOOP_LATCH]]:
; CHECK-NEXT:    [[CONST_0:%.*]] = phi i64 [ [[D]], %[[ELSE]] ], [ 0, %[[LOOP_HEADER]] ]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr inbounds i16, ptr [[DST]], i64 [[CONST_0]]
; CHECK-NEXT:    store i16 0, ptr [[GEP]], align 2
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp ult i64 [[IV_NEXT]], 100
; CHECK-NEXT:    br i1 [[CMP]], label %[[LOOP_HEADER]], label %[[EXIT]], !llvm.loop [[LOOP5:![0-9]+]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop.header

loop.header:                                         ; preds = %loop.latch, %entry
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
  br i1 true, label %loop.latch, label %else

else:
  br label %loop.latch

loop.latch:
  %const.0 = phi i64 [ %d, %else ], [ 0, %loop.header ]
  %gep = getelementptr inbounds i16, ptr %dst, i64 %const.0
  store i16 0, ptr %gep, align 2
  %iv.next = add i64 %iv, 1
  %cmp = icmp ult i64 %iv.next, 100
  br i1 %cmp, label %loop.header, label %exit

exit:
  ret void
}

define void @const_fold_select(ptr %dst, i64 %d) {
; CHECK-LABEL: define void @const_fold_select(
; CHECK-SAME: ptr [[DST:%.*]], i64 [[D:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    [[TMP3:%.*]] = or i64 [[D]], 1
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    store i64 [[TMP3]], ptr [[DST]], align 8
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[TMP4:%.*]] = icmp eq i64 [[INDEX_NEXT]], 100
; CHECK-NEXT:    br i1 [[TMP4]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP6:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    br label %[[EXIT:.*]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ]
; CHECK-NEXT:    br label %[[LOOP_HEADER:.*]]
; CHECK:       [[LOOP_HEADER]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; CHECK-NEXT:    br i1 true, label %[[LOOP_LATCH]], label %[[ELSE:.*]]
; CHECK:       [[ELSE]]:
; CHECK-NEXT:    br label %[[LOOP_LATCH]]
; CHECK:       [[LOOP_LATCH]]:
; CHECK-NEXT:    [[CONST_1:%.*]] = phi i64 [ [[D]], %[[ELSE]] ], [ 1, %[[LOOP_HEADER]] ]
; CHECK-NEXT:    [[OR:%.*]] = or i64 [[D]], [[CONST_1]]
; CHECK-NEXT:    store i64 [[OR]], ptr [[DST]], align 8
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp ult i64 [[IV_NEXT]], 100
; CHECK-NEXT:    br i1 [[CMP]], label %[[LOOP_HEADER]], label %[[EXIT]], !llvm.loop [[LOOP7:![0-9]+]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop.header

loop.header:                                         ; preds = %loop.latch, %entry
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
  br i1 true, label %loop.latch, label %else

else:
  br label %loop.latch

loop.latch:
  %const.1 = phi i64 [ %d, %else ], [ 1, %loop.header ]
  %or = or i64 %d, %const.1
  store i64 %or, ptr %dst, align 8
  %iv.next = add i64 %iv, 1
  %cmp = icmp ult i64 %iv.next, 100
  br i1 %cmp, label %loop.header, label %exit

exit:
  ret void
}

define void @const_fold_add_sub_mul_ashr_lshr(ptr %dst, i64 %d) {
; CHECK-LABEL: define void @const_fold_add_sub_mul_ashr_lshr(
; CHECK-SAME: ptr [[DST:%.*]], i64 [[D:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    store i64 1, ptr [[DST]], align 8
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[TMP6:%.*]] = icmp eq i64 [[INDEX_NEXT]], 100
; CHECK-NEXT:    br i1 [[TMP6]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP8:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    br label %[[EXIT:.*]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ]
; CHECK-NEXT:    br label %[[LOOP_HEADER:.*]]
; CHECK:       [[LOOP_HEADER]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; CHECK-NEXT:    br i1 true, label %[[LOOP_LATCH]], label %[[ELSE:.*]]
; CHECK:       [[ELSE]]:
; CHECK-NEXT:    br label %[[LOOP_LATCH]]
; CHECK:       [[LOOP_LATCH]]:
; CHECK-NEXT:    [[CONST_1:%.*]] = phi i64 [ [[D]], %[[ELSE]] ], [ 1, %[[LOOP_HEADER]] ]
; CHECK-NEXT:    [[ADD:%.*]] = add i64 2, [[CONST_1]]
; CHECK-NEXT:    [[SUB:%.*]] = sub i64 [[ADD]], [[CONST_1]]
; CHECK-NEXT:    [[ASHR:%.*]] = ashr i64 [[SUB]], [[CONST_1]]
; CHECK-NEXT:    [[MUL:%.*]] = mul i64 [[ASHR]], 3
; CHECK-NEXT:    [[LSHR:%.*]] = lshr i64 [[MUL]], [[CONST_1]]
; CHECK-NEXT:    store i64 [[LSHR]], ptr [[DST]], align 8
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp ult i64 [[IV_NEXT]], 100
; CHECK-NEXT:    br i1 [[CMP]], label %[[LOOP_HEADER]], label %[[EXIT]], !llvm.loop [[LOOP9:![0-9]+]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop.header

loop.header:                                         ; preds = %loop.latch, %entry
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
  br i1 true, label %loop.latch, label %else

else:
  br label %loop.latch

loop.latch:
  %const.1 = phi i64 [ %d, %else ], [ 1, %loop.header ]
  %add = add i64 2, %const.1
  %sub = sub i64 %add, %const.1
  %ashr = ashr i64 %sub, %const.1
  %mul = mul i64 %ashr, 3
  %lshr = lshr i64 %mul, %const.1
  store i64 %lshr, ptr %dst, align 8
  %iv.next = add i64 %iv, 1
  %cmp = icmp ult i64 %iv.next, 100
  br i1 %cmp, label %loop.header, label %exit

exit:
  ret void
}

define void @const_fold_and_or_xor(ptr %dst, i64 %d) {
; CHECK-LABEL: define void @const_fold_and_or_xor(
; CHECK-SAME: ptr [[DST:%.*]], i64 [[D:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    store i64 1, ptr [[DST]], align 8
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[TMP4:%.*]] = icmp eq i64 [[INDEX_NEXT]], 100
; CHECK-NEXT:    br i1 [[TMP4]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP10:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    br label %[[EXIT:.*]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ]
; CHECK-NEXT:    br label %[[LOOP_HEADER:.*]]
; CHECK:       [[LOOP_HEADER]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; CHECK-NEXT:    br i1 true, label %[[LOOP_LATCH]], label %[[ELSE:.*]]
; CHECK:       [[ELSE]]:
; CHECK-NEXT:    br label %[[LOOP_LATCH]]
; CHECK:       [[LOOP_LATCH]]:
; CHECK-NEXT:    [[CONST_1:%.*]] = phi i64 [ [[D]], %[[ELSE]] ], [ 1, %[[LOOP_HEADER]] ]
; CHECK-NEXT:    [[OR:%.*]] = or i64 2, [[CONST_1]]
; CHECK-NEXT:    [[AND:%.*]] = and i64 [[OR]], [[CONST_1]]
; CHECK-NEXT:    [[XOR:%.*]] = and i64 [[AND]], [[CONST_1]]
; CHECK-NEXT:    store i64 [[XOR]], ptr [[DST]], align 8
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp ult i64 [[IV_NEXT]], 100
; CHECK-NEXT:    br i1 [[CMP]], label %[[LOOP_HEADER]], label %[[EXIT]], !llvm.loop [[LOOP11:![0-9]+]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop.header

loop.header:                                         ; preds = %loop.latch, %entry
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
  br i1 true, label %loop.latch, label %else

else:
  br label %loop.latch

loop.latch:
  %const.1 = phi i64 [ %d, %else ], [ 1, %loop.header ]
  %or = or i64 2, %const.1
  %and = and i64 %or, %const.1
  %xor = and i64 %and, %const.1
  store i64 %xor, ptr %dst, align 8
  %iv.next = add i64 %iv, 1
  %cmp = icmp ult i64 %iv.next, 100
  br i1 %cmp, label %loop.header, label %exit

exit:
  ret void
}

define void @const_fold_cmp_zext(ptr %dst, i64 %d) {
; CHECK-LABEL: define void @const_fold_cmp_zext(
; CHECK-SAME: ptr [[DST:%.*]], i64 [[D:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    store i8 1, ptr [[DST]], align 1
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[TMP3:%.*]] = icmp eq i64 [[INDEX_NEXT]], 100
; CHECK-NEXT:    br i1 [[TMP3]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP12:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    br label %[[EXIT:.*]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ]
; CHECK-NEXT:    br label %[[LOOP_HEADER:.*]]
; CHECK:       [[LOOP_HEADER]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; CHECK-NEXT:    br i1 true, label %[[LOOP_LATCH]], label %[[ELSE:.*]]
; CHECK:       [[ELSE]]:
; CHECK-NEXT:    br label %[[LOOP_LATCH]]
; CHECK:       [[LOOP_LATCH]]:
; CHECK-NEXT:    [[CONST_1:%.*]] = phi i64 [ [[D]], %[[ELSE]] ], [ 1, %[[LOOP_HEADER]] ]
; CHECK-NEXT:    [[VAL:%.*]] = icmp ugt i64 2, [[CONST_1]]
; CHECK-NEXT:    [[ZEXT:%.*]] = zext i1 [[VAL]] to i8
; CHECK-NEXT:    store i8 [[ZEXT]], ptr [[DST]], align 1
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp ult i64 [[IV_NEXT]], 100
; CHECK-NEXT:    br i1 [[CMP]], label %[[LOOP_HEADER]], label %[[EXIT]], !llvm.loop [[LOOP13:![0-9]+]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop.header

loop.header:                                         ; preds = %loop.latch, %entry
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
  br i1 true, label %loop.latch, label %else

else:
  br label %loop.latch

loop.latch:
  %const.1 = phi i64 [ %d, %else ], [ 1, %loop.header ]
  %val = icmp ugt i64 2, %const.1
  %zext = zext i1 %val to i8
  store i8 %zext, ptr %dst, align 1
  %iv.next = add i64 %iv, 1
  %cmp = icmp ult i64 %iv.next, 100
  br i1 %cmp, label %loop.header, label %exit

exit:
  ret void
}

define void @const_fold_trunc(ptr %dst, i64 %d) {
; CHECK-LABEL: define void @const_fold_trunc(
; CHECK-SAME: ptr [[DST:%.*]], i64 [[D:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    store i16 0, ptr [[DST]], align 2
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq i64 [[INDEX_NEXT]], 100
; CHECK-NEXT:    br i1 [[TMP2]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP14:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    br label %[[EXIT:.*]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ]
; CHECK-NEXT:    br label %[[LOOP_HEADER:.*]]
; CHECK:       [[LOOP_HEADER]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; CHECK-NEXT:    br i1 true, label %[[LOOP_LATCH]], label %[[ELSE:.*]]
; CHECK:       [[ELSE]]:
; CHECK-NEXT:    br label %[[LOOP_LATCH]]
; CHECK:       [[LOOP_LATCH]]:
; CHECK-NEXT:    [[CONST_0:%.*]] = phi i64 [ [[D]], %[[ELSE]] ], [ 0, %[[LOOP_HEADER]] ]
; CHECK-NEXT:    [[TRUNC:%.*]] = trunc i64 [[CONST_0]] to i16
; CHECK-NEXT:    store i16 [[TRUNC]], ptr [[DST]], align 2
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp ult i64 [[IV_NEXT]], 100
; CHECK-NEXT:    br i1 [[CMP]], label %[[LOOP_HEADER]], label %[[EXIT]], !llvm.loop [[LOOP15:![0-9]+]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop.header

loop.header:                                         ; preds = %loop.latch, %entry
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
  br i1 true, label %loop.latch, label %else

else:
  br label %loop.latch

loop.latch:
  %const.0 = phi i64 [ %d, %else ], [ 0, %loop.header ]
  %trunc = trunc i64 %const.0 to i16
  store i16 %trunc, ptr %dst, align 2
  %iv.next = add i64 %iv, 1
  %cmp = icmp ult i64 %iv.next, 100
  br i1 %cmp, label %loop.header, label %exit

exit:
  ret void
}