llvm/test/Transforms/LoopVectorize/iv_outside_user.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --replace-value-regex "!llvm.loop ![0-9]+" --version 5
; RUN: opt -S -passes=loop-vectorize -force-vector-interleave=1 -force-vector-width=2 < %s | FileCheck --check-prefixes=CHECK,VEC %s
; RUN: opt -S -passes=loop-vectorize -force-vector-interleave=2 -force-vector-width=1 < %s | FileCheck --check-prefixes=CHECK %s

define i32 @postinc(i32 %k)  {
; CHECK-LABEL: define i32 @postinc(
; CHECK-SAME: i32 [[K:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[K]], 2
; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i32 [[K]], 2
; CHECK-NEXT:    [[N_VEC:%.*]] = sub i32 [[K]], [[N_MOD_VF]]
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i32 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 2
; CHECK-NEXT:    [[TMP0:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP0]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i32 [[K]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[CMP_N]], label %[[FOR_END:.*]], label %[[SCALAR_PH]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT:    br label %[[FOR_BODY:.*]]
; CHECK:       [[FOR_BODY]]:
; CHECK-NEXT:    [[INC_PHI:%.*]] = phi i32 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[INC:%.*]], %[[FOR_BODY]] ]
; CHECK-NEXT:    [[INC]] = add nsw i32 [[INC_PHI]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[INC]], [[K]]
; CHECK-NEXT:    br i1 [[CMP]], label %[[FOR_END]], label %[[FOR_BODY]], {{!llvm.loop ![0-9]+}}
; CHECK:       [[FOR_END]]:
; CHECK-NEXT:    [[INC_LCSSA:%.*]] = phi i32 [ [[INC]], %[[FOR_BODY]] ], [ [[N_VEC]], %[[MIDDLE_BLOCK]] ]
; CHECK-NEXT:    ret i32 [[INC_LCSSA]]
;
entry:
  br label %for.body

for.body:
  %inc.phi = phi i32 [ 0, %entry ], [ %inc, %for.body ]
  %inc = add nsw i32 %inc.phi, 1
  %cmp = icmp eq i32 %inc, %k
  br i1 %cmp, label %for.end, label %for.body

for.end:
  ret i32 %inc
}

define i32 @preinc(i32 %k)  {
; CHECK-LABEL: define i32 @preinc(
; CHECK-SAME: i32 [[K:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[K]], 2
; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i32 [[K]], 2
; CHECK-NEXT:    [[N_VEC:%.*]] = sub i32 [[K]], [[N_MOD_VF]]
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i32 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 2
; CHECK-NEXT:    [[TMP0:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP0]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i32 [[K]], [[N_VEC]]
; CHECK-NEXT:    [[IND_ESCAPE:%.*]] = sub i32 [[N_VEC]], 1
; CHECK-NEXT:    br i1 [[CMP_N]], label %[[FOR_END:.*]], label %[[SCALAR_PH]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT:    br label %[[FOR_BODY:.*]]
; CHECK:       [[FOR_BODY]]:
; CHECK-NEXT:    [[INC_PHI:%.*]] = phi i32 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[INC:%.*]], %[[FOR_BODY]] ]
; CHECK-NEXT:    [[INC]] = add nsw i32 [[INC_PHI]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[INC]], [[K]]
; CHECK-NEXT:    br i1 [[CMP]], label %[[FOR_END]], label %[[FOR_BODY]], {{!llvm.loop ![0-9]+}}
; CHECK:       [[FOR_END]]:
; CHECK-NEXT:    [[INC_PHI_LCSSA:%.*]] = phi i32 [ [[INC_PHI]], %[[FOR_BODY]] ], [ [[IND_ESCAPE]], %[[MIDDLE_BLOCK]] ]
; CHECK-NEXT:    ret i32 [[INC_PHI_LCSSA]]
;
entry:
  br label %for.body

for.body:
  %inc.phi = phi i32 [ 0, %entry ], [ %inc, %for.body ]
  %inc = add nsw i32 %inc.phi, 1
  %cmp = icmp eq i32 %inc, %k
  br i1 %cmp, label %for.end, label %for.body

for.end:
  ret i32 %inc.phi
}

define i32 @constpre()  {
; CHECK-LABEL: define i32 @constpre() {
; 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 i32 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 2
; CHECK-NEXT:    [[TMP0:%.*]] = icmp eq i32 [[INDEX_NEXT]], 16
; CHECK-NEXT:    br i1 [[TMP0]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    br i1 true, label %[[FOR_END:.*]], label %[[SCALAR_PH]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i32 [ 0, %[[MIDDLE_BLOCK]] ], [ 32, %[[ENTRY]] ]
; CHECK-NEXT:    br label %[[FOR_BODY:.*]]
; CHECK:       [[FOR_BODY]]:
; CHECK-NEXT:    [[INC_PHI:%.*]] = phi i32 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[INC:%.*]], %[[FOR_BODY]] ]
; CHECK-NEXT:    [[INC]] = sub nsw i32 [[INC_PHI]], 2
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[INC]], 0
; CHECK-NEXT:    br i1 [[CMP]], label %[[FOR_END]], label %[[FOR_BODY]], {{!llvm.loop ![0-9]+}}
; CHECK:       [[FOR_END]]:
; CHECK-NEXT:    [[INC_PHI_LCSSA:%.*]] = phi i32 [ [[INC_PHI]], %[[FOR_BODY]] ], [ 2, %[[MIDDLE_BLOCK]] ]
; CHECK-NEXT:    ret i32 [[INC_PHI_LCSSA]]
;
entry:
  br label %for.body

for.body:
  %inc.phi = phi i32 [ 32, %entry ], [ %inc, %for.body ]
  %inc = sub nsw i32 %inc.phi, 2
  %cmp = icmp eq i32 %inc, 0
  br i1 %cmp, label %for.end, label %for.body

for.end:
  ret i32 %inc.phi
}

define ptr @geppre(ptr %ptr) {
; CHECK-LABEL: define ptr @geppre(
; CHECK-SAME: ptr [[PTR:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    [[IND_END:%.*]] = getelementptr i8, ptr [[PTR]], i64 512
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 2
; CHECK-NEXT:    [[TMP0:%.*]] = icmp eq i64 [[INDEX_NEXT]], 32
; CHECK-NEXT:    br i1 [[TMP0]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    [[IND_ESCAPE:%.*]] = getelementptr i8, ptr [[IND_END]], i64 -16
; CHECK-NEXT:    br i1 true, label %[[FOR_END:.*]], label %[[SCALAR_PH]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i32 [ 32, %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT:    [[BC_RESUME_VAL1:%.*]] = phi ptr [ [[IND_END]], %[[MIDDLE_BLOCK]] ], [ [[PTR]], %[[ENTRY]] ]
; CHECK-NEXT:    br label %[[FOR_BODY:.*]]
; CHECK:       [[FOR_BODY]]:
; CHECK-NEXT:    [[INC_PHI:%.*]] = phi i32 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[INC:%.*]], %[[FOR_BODY]] ]
; CHECK-NEXT:    [[PTR_PHI:%.*]] = phi ptr [ [[BC_RESUME_VAL1]], %[[SCALAR_PH]] ], [ [[INC_PTR:%.*]], %[[FOR_BODY]] ]
; CHECK-NEXT:    [[INC]] = add nsw i32 [[INC_PHI]], 1
; CHECK-NEXT:    [[INC_PTR]] = getelementptr i32, ptr [[PTR_PHI]], i32 4
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[INC]], 32
; CHECK-NEXT:    br i1 [[CMP]], label %[[FOR_END]], label %[[FOR_BODY]], {{!llvm.loop ![0-9]+}}
; CHECK:       [[FOR_END]]:
; CHECK-NEXT:    [[PTR_PHI_LCSSA:%.*]] = phi ptr [ [[PTR_PHI]], %[[FOR_BODY]] ], [ [[IND_ESCAPE]], %[[MIDDLE_BLOCK]] ]
; CHECK-NEXT:    ret ptr [[PTR_PHI_LCSSA]]
;
entry:
  br label %for.body

for.body:
  %inc.phi = phi i32 [ 0, %entry ], [ %inc, %for.body ]
  %ptr.phi = phi ptr [ %ptr, %entry ], [ %inc.ptr, %for.body ]
  %inc = add nsw i32 %inc.phi, 1
  %inc.ptr = getelementptr i32, ptr %ptr.phi, i32 4
  %cmp = icmp eq i32 %inc, 32
  br i1 %cmp, label %for.end, label %for.body

for.end:
  ret ptr %ptr.phi
}

define ptr @both(i32 %k)  {
; CHECK-LABEL: define ptr @both(
; CHECK-SAME: i32 [[K:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    [[BASE:%.*]] = getelementptr inbounds i32, ptr undef, i64 1
; CHECK-NEXT:    [[TMP0:%.*]] = add i32 [[K]], -1
; CHECK-NEXT:    [[TMP1:%.*]] = zext i32 [[TMP0]] to i64
; CHECK-NEXT:    [[TMP2:%.*]] = add nuw nsw i64 [[TMP1]], 1
; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP2]], 2
; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i64 [[TMP2]], 2
; CHECK-NEXT:    [[N_VEC:%.*]] = sub i64 [[TMP2]], [[N_MOD_VF]]
; CHECK-NEXT:    [[IND_END:%.*]] = trunc i64 [[N_VEC]] to i32
; CHECK-NEXT:    [[TMP3:%.*]] = mul i64 [[N_VEC]], 4
; CHECK-NEXT:    [[IND_END1:%.*]] = getelementptr i8, ptr [[BASE]], i64 [[TMP3]]
; CHECK-NEXT:    [[TMP4:%.*]] = mul i64 [[N_VEC]], 4
; CHECK-NEXT:    [[IND_END2:%.*]] = getelementptr i8, ptr undef, i64 [[TMP4]]
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 2
; CHECK-NEXT:    [[TMP5:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP5]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[TMP2]], [[N_VEC]]
; CHECK-NEXT:    [[IND_ESCAPE:%.*]] = getelementptr i8, ptr [[IND_END1]], i64 -4
; CHECK-NEXT:    br i1 [[CMP_N]], label %[[FOR_END:.*]], label %[[SCALAR_PH]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i32 [ [[IND_END]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT:    [[BC_RESUME_VAL3:%.*]] = phi ptr [ [[IND_END1]], %[[MIDDLE_BLOCK]] ], [ [[BASE]], %[[ENTRY]] ]
; CHECK-NEXT:    [[BC_RESUME_VAL4:%.*]] = phi ptr [ [[IND_END2]], %[[MIDDLE_BLOCK]] ], [ undef, %[[ENTRY]] ]
; CHECK-NEXT:    br label %[[FOR_BODY:.*]]
; CHECK:       [[FOR_BODY]]:
; CHECK-NEXT:    [[INC_PHI:%.*]] = phi i32 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[INC:%.*]], %[[FOR_BODY]] ]
; CHECK-NEXT:    [[INC_LAG1:%.*]] = phi ptr [ [[BC_RESUME_VAL3]], %[[SCALAR_PH]] ], [ [[TMP:%.*]], %[[FOR_BODY]] ]
; CHECK-NEXT:    [[INC_LAG2:%.*]] = phi ptr [ [[BC_RESUME_VAL4]], %[[SCALAR_PH]] ], [ [[INC_LAG1]], %[[FOR_BODY]] ]
; CHECK-NEXT:    [[TMP]] = getelementptr inbounds i32, ptr [[INC_LAG1]], i64 1
; CHECK-NEXT:    [[INC]] = add nsw i32 [[INC_PHI]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[INC]], [[K]]
; CHECK-NEXT:    br i1 [[CMP]], label %[[FOR_END]], label %[[FOR_BODY]], {{!llvm.loop ![0-9]+}}
; CHECK:       [[FOR_END]]:
; CHECK-NEXT:    [[INC_LAG1_LCSSA:%.*]] = phi ptr [ [[INC_LAG1]], %[[FOR_BODY]] ], [ [[IND_ESCAPE]], %[[MIDDLE_BLOCK]] ]
; CHECK-NEXT:    ret ptr [[INC_LAG1_LCSSA]]
;
entry:
  %base = getelementptr inbounds i32, ptr undef, i64 1
  br label %for.body

for.body:
  %inc.phi = phi i32 [ 0, %entry ], [ %inc, %for.body ]
  %inc.lag1 = phi ptr [ %base, %entry ], [ %tmp, %for.body]
  %inc.lag2 = phi ptr [ undef, %entry ], [ %inc.lag1, %for.body]
  %tmp = getelementptr inbounds i32, ptr %inc.lag1, i64 1
  %inc = add nsw i32 %inc.phi, 1
  %cmp = icmp eq i32 %inc, %k
  br i1 %cmp, label %for.end, label %for.body

for.end:
  ret ptr %inc.lag1
}

define i32 @multiphi(i32 %k, ptr %p)  {
; CHECK-LABEL: define i32 @multiphi(
; CHECK-SAME: i32 [[K:%.*]], ptr [[P:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[K]], 2
; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i32 [[K]], 2
; CHECK-NEXT:    [[N_VEC:%.*]] = sub i32 [[K]], [[N_MOD_VF]]
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i32 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 2
; CHECK-NEXT:    [[TMP0:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP0]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i32 [[K]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[CMP_N]], label %[[FOR_END:.*]], label %[[SCALAR_PH]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT:    br label %[[FOR_BODY:.*]]
; CHECK:       [[FOR_BODY]]:
; CHECK-NEXT:    [[INC_PHI:%.*]] = phi i32 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[INC:%.*]], %[[FOR_BODY]] ]
; CHECK-NEXT:    [[INC]] = add nsw i32 [[INC_PHI]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[INC]], [[K]]
; CHECK-NEXT:    br i1 [[CMP]], label %[[FOR_END]], label %[[FOR_BODY]], {{!llvm.loop ![0-9]+}}
; CHECK:       [[FOR_END]]:
; CHECK-NEXT:    [[PHI:%.*]] = phi i32 [ [[INC]], %[[FOR_BODY]] ], [ [[N_VEC]], %[[MIDDLE_BLOCK]] ]
; CHECK-NEXT:    [[PHI2:%.*]] = phi i32 [ [[INC]], %[[FOR_BODY]] ], [ [[N_VEC]], %[[MIDDLE_BLOCK]] ]
; CHECK-NEXT:    store i32 [[PHI2]], ptr [[P]], align 4
; CHECK-NEXT:    ret i32 [[PHI]]
;
entry:
  br label %for.body

for.body:
  %inc.phi = phi i32 [ 0, %entry ], [ %inc, %for.body ]
  %inc = add nsw i32 %inc.phi, 1
  %cmp = icmp eq i32 %inc, %k
  br i1 %cmp, label %for.end, label %for.body

for.end:
  %phi = phi i32 [ %inc, %for.body ]
  %phi2 = phi i32 [ %inc, %for.body ]
  store i32 %phi2, ptr %p
  ret i32 %phi
}

define void @PR30742() {
; CHECK-LABEL: define void @PR30742() {
; CHECK-NEXT:  [[BB0:.*:]]
; CHECK-NEXT:    br label %[[BB1:.*]]
; CHECK:       [[BB1_LOOPEXIT:.*]]:
; CHECK-NEXT:    br label %[[BB1]]
; CHECK:       [[BB1]]:
; CHECK-NEXT:    [[TMP00:%.*]] = load i32, ptr undef, align 16
; CHECK-NEXT:    [[TMP01:%.*]] = sub i32 [[TMP00]], undef
; CHECK-NEXT:    [[TMP02:%.*]] = icmp slt i32 [[TMP01]], 1
; CHECK-NEXT:    [[TMP03:%.*]] = select i1 [[TMP02]], i32 1, i32 [[TMP01]]
; CHECK-NEXT:    [[TMP04:%.*]] = add nsw i32 [[TMP03]], -7
; CHECK-NEXT:    [[TMP0:%.*]] = add i32 [[TMP03]], -8
; CHECK-NEXT:    [[TMP1:%.*]] = add nsw i32 [[TMP03]], -15
; CHECK-NEXT:    [[SMIN1:%.*]] = call i32 @llvm.smin.i32(i32 [[TMP1]], i32 0)
; CHECK-NEXT:    [[TMP2:%.*]] = sub i32 [[TMP0]], [[SMIN1]]
; CHECK-NEXT:    [[TMP3:%.*]] = lshr i32 [[TMP2]], 3
; CHECK-NEXT:    [[TMP4:%.*]] = add nuw nsw i32 [[TMP3]], 1
; CHECK-NEXT:    [[MIN_ITERS_CHECK4:%.*]] = icmp ult i32 [[TMP4]], 2
; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK4]], label %[[SCALAR_PH3:.*]], label %[[VECTOR_PH5:.*]]
; CHECK:       [[VECTOR_PH5]]:
; CHECK-NEXT:    [[N_MOD_VF6:%.*]] = urem i32 [[TMP4]], 2
; CHECK-NEXT:    [[N_VEC7:%.*]] = sub i32 [[TMP4]], [[N_MOD_VF6]]
; CHECK-NEXT:    [[TMP5:%.*]] = mul i32 [[N_VEC7]], -8
; CHECK-NEXT:    [[IND_END8:%.*]] = add i32 [[TMP04]], [[TMP5]]
; CHECK-NEXT:    br label %[[VECTOR_BODY9:.*]]
; CHECK:       [[VECTOR_BODY9]]:
; CHECK-NEXT:    [[INDEX10:%.*]] = phi i32 [ 0, %[[VECTOR_PH5]] ], [ [[INDEX_NEXT11:%.*]], %[[VECTOR_BODY9]] ]
; CHECK-NEXT:    [[INDEX_NEXT11]] = add nuw i32 [[INDEX10]], 2
; CHECK-NEXT:    [[TMP6:%.*]] = icmp eq i32 [[INDEX_NEXT11]], [[N_VEC7]]
; CHECK-NEXT:    br i1 [[TMP6]], label %[[MIDDLE_BLOCK2:.*]], label %[[VECTOR_BODY9]], {{!llvm.loop ![0-9]+}}
; CHECK:       [[MIDDLE_BLOCK2]]:
; CHECK-NEXT:    [[CMP_N12:%.*]] = icmp eq i32 [[TMP4]], [[N_VEC7]]
; CHECK-NEXT:    [[IND_ESCAPE:%.*]] = sub i32 [[IND_END8]], -8
; CHECK-NEXT:    br i1 [[CMP_N12]], label %[[BB3:.*]], label %[[SCALAR_PH3]]
; CHECK:       [[SCALAR_PH3]]:
; CHECK-NEXT:    [[BC_RESUME_VAL13:%.*]] = phi i32 [ [[IND_END8]], %[[MIDDLE_BLOCK2]] ], [ [[TMP04]], %[[BB1]] ]
; CHECK-NEXT:    br label %[[BB2:.*]]
; CHECK:       [[BB2]]:
; CHECK-NEXT:    [[TMP05:%.*]] = phi i32 [ [[BC_RESUME_VAL13]], %[[SCALAR_PH3]] ], [ [[TMP06:%.*]], %[[BB2]] ]
; CHECK-NEXT:    [[TMP06]] = add i32 [[TMP05]], -8
; CHECK-NEXT:    [[TMP07:%.*]] = icmp sgt i32 [[TMP06]], 0
; CHECK-NEXT:    br i1 [[TMP07]], label %[[BB2]], label %[[BB3]], {{!llvm.loop ![0-9]+}}
; CHECK:       [[BB3]]:
; CHECK-NEXT:    [[TMP08:%.*]] = phi i32 [ [[TMP05]], %[[BB2]] ], [ [[IND_ESCAPE]], %[[MIDDLE_BLOCK2]] ]
; CHECK-NEXT:    [[TMP09:%.*]] = sub i32 [[TMP00]], undef
; CHECK-NEXT:    [[TMP10:%.*]] = icmp slt i32 [[TMP09]], 1
; CHECK-NEXT:    [[TMP11:%.*]] = select i1 [[TMP10]], i32 1, i32 [[TMP09]]
; CHECK-NEXT:    [[TMP12:%.*]] = add nsw i32 [[TMP11]], -7
; CHECK-NEXT:    [[TMP7:%.*]] = add i32 [[TMP11]], -8
; CHECK-NEXT:    [[TMP8:%.*]] = add nsw i32 [[TMP11]], -15
; CHECK-NEXT:    [[SMIN:%.*]] = call i32 @llvm.smin.i32(i32 [[TMP8]], i32 0)
; CHECK-NEXT:    [[TMP9:%.*]] = sub i32 [[TMP7]], [[SMIN]]
; CHECK-NEXT:    [[TMP10:%.*]] = lshr i32 [[TMP9]], 3
; CHECK-NEXT:    [[TMP11:%.*]] = add nuw nsw i32 [[TMP10]], 1
; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[TMP11]], 2
; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i32 [[TMP11]], 2
; CHECK-NEXT:    [[N_VEC:%.*]] = sub i32 [[TMP11]], [[N_MOD_VF]]
; CHECK-NEXT:    [[TMP16:%.*]] = mul i32 [[N_VEC]], -8
; CHECK-NEXT:    [[IND_END:%.*]] = add i32 [[TMP12]], [[TMP16]]
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i32 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 2
; CHECK-NEXT:    [[TMP13:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP13]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i32 [[TMP11]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[CMP_N]], label %[[BB1_LOOPEXIT]], label %[[SCALAR_PH]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i32 [ [[IND_END]], %[[MIDDLE_BLOCK]] ], [ [[TMP12]], %[[BB3]] ]
; CHECK-NEXT:    br label %[[BB4:.*]]
; CHECK:       [[BB4]]:
; CHECK-NEXT:    [[TMP13:%.*]] = phi i32 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[TMP14:%.*]], %[[BB4]] ]
; CHECK-NEXT:    [[TMP14]] = add i32 [[TMP13]], -8
; CHECK-NEXT:    [[TMP15:%.*]] = icmp sgt i32 [[TMP14]], 0
; CHECK-NEXT:    br i1 [[TMP15]], label %[[BB4]], label %[[BB1_LOOPEXIT]], {{!llvm.loop ![0-9]+}}
;
BB0:
  br label %BB1

BB1:
  %tmp00 = load i32, ptr undef, align 16
  %tmp01 = sub i32 %tmp00, undef
  %tmp02 = icmp slt i32 %tmp01, 1
  %tmp03 = select i1 %tmp02, i32 1, i32 %tmp01
  %tmp04 = add nsw i32 %tmp03, -7
  br label %BB2

BB2:
  %tmp05 = phi i32 [ %tmp04, %BB1 ], [ %tmp06, %BB2 ]
  %tmp06 = add i32 %tmp05, -8
  %tmp07 = icmp sgt i32 %tmp06, 0
  br i1 %tmp07, label %BB2, label %BB3

BB3:
  %tmp08 = phi i32 [ %tmp05, %BB2 ]
  %tmp09 = sub i32 %tmp00, undef
  %tmp10 = icmp slt i32 %tmp09, 1
  %tmp11 = select i1 %tmp10, i32 1, i32 %tmp09
  %tmp11.inc = add nsw i32 %tmp11, -7
  br label %BB4

BB4:
  %tmp13 = phi i32 [ %tmp11.inc, %BB3 ], [ %tmp14, %BB4 ]
  %tmp14 = add i32 %tmp13, -8
  %tmp15 = icmp sgt i32 %tmp14, 0
  br i1 %tmp15, label %BB4, label %BB1
}

;
define i64 @iv_scalar_steps_and_outside_users(ptr %ptr) {
; VEC-LABEL: define i64 @iv_scalar_steps_and_outside_users(
; VEC-SAME: ptr [[PTR:%.*]]) {
; VEC-NEXT:  [[ENTRY:.*]]:
; VEC-NEXT:    br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; VEC:       [[VECTOR_PH]]:
; VEC-NEXT:    br label %[[VECTOR_BODY:.*]]
; VEC:       [[VECTOR_BODY]]:
; VEC-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; VEC-NEXT:    [[VEC_IND:%.*]] = phi <2 x i64> [ <i64 0, i64 1>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_BODY]] ]
; VEC-NEXT:    [[TMP0:%.*]] = add i64 [[INDEX]], 0
; VEC-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i64, ptr [[PTR]], i64 [[TMP0]]
; VEC-NEXT:    [[TMP2:%.*]] = getelementptr inbounds i64, ptr [[TMP1]], i32 0
; VEC-NEXT:    store <2 x i64> [[VEC_IND]], ptr [[TMP2]], align 4
; VEC-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 2
; VEC-NEXT:    [[VEC_IND_NEXT]] = add <2 x i64> [[VEC_IND]], <i64 2, i64 2>
; VEC-NEXT:    [[TMP3:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1002
; VEC-NEXT:    br i1 [[TMP3]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
; VEC:       [[MIDDLE_BLOCK]]:
; VEC-NEXT:    br i1 true, label %[[EXIT:.*]], label %[[SCALAR_PH]]
; VEC:       [[SCALAR_PH]]:
; VEC-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 1002, %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; VEC-NEXT:    br label %[[LOOP:.*]]
; VEC:       [[LOOP]]:
; VEC-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; VEC-NEXT:    [[IV_NEXT]] = add nuw i64 [[IV]], 1
; VEC-NEXT:    [[GEP_PTR:%.*]] = getelementptr inbounds i64, ptr [[PTR]], i64 [[IV]]
; VEC-NEXT:    store i64 [[IV]], ptr [[GEP_PTR]], align 4
; VEC-NEXT:    [[EXITCOND:%.*]] = icmp ugt i64 [[IV]], 1000
; VEC-NEXT:    br i1 [[EXITCOND]], label %[[EXIT]], label %[[LOOP]], {{!llvm.loop ![0-9]+}}
; VEC:       [[EXIT]]:
; VEC-NEXT:    [[IV_LCSSA:%.*]] = phi i64 [ [[IV]], %[[LOOP]] ], [ 1001, %[[MIDDLE_BLOCK]] ]
; VEC-NEXT:    ret i64 [[IV_LCSSA]]
;
entry:
  br label %loop

loop:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
  %iv.next = add nuw i64 %iv, 1
  %gep.ptr = getelementptr inbounds i64, ptr %ptr, i64 %iv
  store i64 %iv, ptr %gep.ptr
  %exitcond = icmp ugt i64 %iv, 1000
  br i1 %exitcond, label %exit, label %loop

exit:
  %iv.lcssa = phi i64 [ %iv, %loop ]
  ret i64 %iv.lcssa
}


; %iv.2 is dead in the vector loop and only used outside the loop.
define i32 @iv_2_dead_in_loop_only_used_outside(ptr %ptr) {
; VEC-LABEL: define i32 @iv_2_dead_in_loop_only_used_outside(
; VEC-SAME: ptr [[PTR:%.*]]) {
; VEC-NEXT:  [[ENTRY:.*]]:
; VEC-NEXT:    br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; VEC:       [[VECTOR_PH]]:
; VEC-NEXT:    br label %[[VECTOR_BODY:.*]]
; VEC:       [[VECTOR_BODY]]:
; VEC-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; VEC-NEXT:    [[VEC_IND:%.*]] = phi <2 x i64> [ <i64 0, i64 1>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_BODY]] ]
; VEC-NEXT:    [[TMP0:%.*]] = add i64 [[INDEX]], 0
; VEC-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i64, ptr [[PTR]], i64 [[TMP0]]
; VEC-NEXT:    [[TMP2:%.*]] = getelementptr inbounds i64, ptr [[TMP1]], i32 0
; VEC-NEXT:    store <2 x i64> [[VEC_IND]], ptr [[TMP2]], align 4
; VEC-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 2
; VEC-NEXT:    [[VEC_IND_NEXT]] = add <2 x i64> [[VEC_IND]], <i64 2, i64 2>
; VEC-NEXT:    [[TMP3:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1002
; VEC-NEXT:    br i1 [[TMP3]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
; VEC:       [[MIDDLE_BLOCK]]:
; VEC-NEXT:    br i1 true, label %[[EXIT:.*]], label %[[SCALAR_PH]]
; VEC:       [[SCALAR_PH]]:
; VEC-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 1002, %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; VEC-NEXT:    [[BC_RESUME_VAL1:%.*]] = phi i32 [ 2004, %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; VEC-NEXT:    br label %[[LOOP:.*]]
; VEC:       [[LOOP]]:
; VEC-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; VEC-NEXT:    [[IV_2:%.*]] = phi i32 [ [[BC_RESUME_VAL1]], %[[SCALAR_PH]] ], [ [[IV_2_NEXT:%.*]], %[[LOOP]] ]
; VEC-NEXT:    [[IV_NEXT]] = add nuw i64 [[IV]], 1
; VEC-NEXT:    [[IV_2_NEXT]] = add nuw i32 [[IV_2]], 2
; VEC-NEXT:    [[GEP_PTR:%.*]] = getelementptr inbounds i64, ptr [[PTR]], i64 [[IV]]
; VEC-NEXT:    store i64 [[IV]], ptr [[GEP_PTR]], align 4
; VEC-NEXT:    [[EXITCOND:%.*]] = icmp ugt i64 [[IV]], 1000
; VEC-NEXT:    br i1 [[EXITCOND]], label %[[EXIT]], label %[[LOOP]], {{!llvm.loop ![0-9]+}}
; VEC:       [[EXIT]]:
; VEC-NEXT:    [[IV_2_LCSSA:%.*]] = phi i32 [ [[IV_2]], %[[LOOP]] ], [ 2002, %[[MIDDLE_BLOCK]] ]
; VEC-NEXT:    ret i32 [[IV_2_LCSSA]]
;
entry:
  br label %loop

loop:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
  %iv.2 = phi i32 [ 0, %entry ], [ %iv.2.next, %loop ]
  %iv.next = add nuw i64 %iv, 1
  %iv.2.next = add nuw i32 %iv.2, 2
  %gep.ptr = getelementptr inbounds i64, ptr %ptr, i64 %iv
  store i64 %iv, ptr %gep.ptr
  %exitcond = icmp ugt i64 %iv, 1000
  br i1 %exitcond, label %exit, label %loop

exit:
  %iv.2.lcssa = phi i32 [ %iv.2, %loop ]
  ret i32 %iv.2.lcssa
}