test/Transforms/LoopVectorize/single-early-exit-interleave.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 4
; RUN: opt -p loop-vectorize -force-vector-width=4 -force-vector-interleave=4 -S %s | FileCheck --check-prefix=VF4IC4 %s

declare void @init_mem(ptr, i64);

define i64 @multi_exiting_to_different_exits_live_in_exit_values() {
; VF4IC4-LABEL: define i64 @multi_exiting_to_different_exits_live_in_exit_values() {
; VF4IC4-NEXT:  entry:
; VF4IC4-NEXT:    [[SRC:%.*]] = alloca [128 x i32], align 4
; VF4IC4-NEXT:    call void @init_mem(ptr [[SRC]])
; VF4IC4-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; VF4IC4:       vector.ph:
; VF4IC4-NEXT:    br label [[VECTOR_BODY:%.*]]
; VF4IC4:       vector.body:
; VF4IC4-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; VF4IC4-NEXT:    [[TMP0:%.*]] = getelementptr inbounds i32, ptr [[SRC]], i64 [[INDEX]]
; VF4IC4-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i32, ptr [[TMP0]], i32 0
; VF4IC4-NEXT:    [[WIDE_LOAD3:%.*]] = load <4 x i32>, ptr [[TMP1]], align 4
; VF4IC4-NEXT:    [[TMP8:%.*]] = icmp eq <4 x i32> [[WIDE_LOAD3]], splat (i32 10)
; VF4IC4-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; VF4IC4-NEXT:    [[TMP3:%.*]] = call i1 @llvm.vector.reduce.or.v4i1(<4 x i1> [[TMP8]])
; VF4IC4-NEXT:    [[TMP4:%.*]] = icmp eq i64 [[INDEX_NEXT]], 128
; VF4IC4-NEXT:    [[TMP5:%.*]] = or i1 [[TMP3]], [[TMP4]]
; VF4IC4-NEXT:    br i1 [[TMP5]], label [[MIDDLE_SPLIT:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; VF4IC4:       middle.split:
; VF4IC4-NEXT:    br i1 [[TMP3]], label [[VECTOR_EARLY_EXIT:%.*]], label [[MIDDLE_BLOCK:%.*]]
; VF4IC4:       middle.block:
; VF4IC4-NEXT:    br i1 true, label [[E2:%.*]], label [[SCALAR_PH]]
; VF4IC4:       vector.early.exit:
; VF4IC4-NEXT:    br label [[E1:%.*]]
; VF4IC4:       scalar.ph:
; VF4IC4-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 128, [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
; VF4IC4-NEXT:    br label [[LOOP_HEADER:%.*]]
; VF4IC4:       loop.header:
; VF4IC4-NEXT:    [[IV:%.*]] = phi i64 [ [[INC:%.*]], [[LOOP_LATCH:%.*]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
; VF4IC4-NEXT:    [[GEP_SRC:%.*]] = getelementptr inbounds i32, ptr [[SRC]], i64 [[IV]]
; VF4IC4-NEXT:    [[L:%.*]] = load i32, ptr [[GEP_SRC]], align 4
; VF4IC4-NEXT:    [[C_1:%.*]] = icmp eq i32 [[L]], 10
; VF4IC4-NEXT:    br i1 [[C_1]], label [[E1]], label [[LOOP_LATCH]]
; VF4IC4:       loop.latch:
; VF4IC4-NEXT:    [[INC]] = add nuw i64 [[IV]], 1
; VF4IC4-NEXT:    [[C_2:%.*]] = icmp eq i64 [[INC]], 128
; VF4IC4-NEXT:    br i1 [[C_2]], label [[E2]], label [[LOOP_HEADER]], !llvm.loop [[LOOP3:![0-9]+]]
; VF4IC4:       e1:
; VF4IC4-NEXT:    [[P1:%.*]] = phi i64 [ 0, [[LOOP_HEADER]] ], [ 0, [[VECTOR_EARLY_EXIT]] ]
; VF4IC4-NEXT:    ret i64 [[P1]]
; VF4IC4:       e2:
; VF4IC4-NEXT:    [[P2:%.*]] = phi i64 [ 1, [[LOOP_LATCH]] ], [ 1, [[MIDDLE_BLOCK]] ]
; VF4IC4-NEXT:    ret i64 [[P2]]
;
entry:
  %src = alloca [128 x i32]
  call void @init_mem(ptr %src)
  br label %loop.header

loop.header:
  %iv = phi i64 [ %inc, %loop.latch ], [ 0, %entry ]
  %gep.src = getelementptr inbounds i32, ptr %src, i64 %iv
  %l = load i32, ptr %gep.src
  %c.1 = icmp eq i32 %l, 10
  br i1 %c.1, label %e1, label %loop.latch

loop.latch:
  %inc = add nuw i64 %iv, 1
  %c.2 = icmp eq i64 %inc, 128
  br i1 %c.2, label %e2, label %loop.header

e1:
  %p1 = phi i64 [ 0, %loop.header ]
  ret i64 %p1

e2:
  %p2 = phi i64 [ 1, %loop.latch ]
  ret i64 %p2
}

define i64 @same_exit_block_pre_inc_use1() {
; VF4IC4-LABEL: define i64 @same_exit_block_pre_inc_use1() {
; VF4IC4-NEXT:  entry:
; VF4IC4-NEXT:    [[P1:%.*]] = alloca [1024 x i8], align 1
; VF4IC4-NEXT:    [[P2:%.*]] = alloca [1024 x i8], align 1
; VF4IC4-NEXT:    call void @init_mem(ptr [[P1]], i64 1024)
; VF4IC4-NEXT:    call void @init_mem(ptr [[P2]], i64 1024)
; VF4IC4-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; VF4IC4:       vector.ph:
; VF4IC4-NEXT:    br label [[VECTOR_BODY:%.*]]
; VF4IC4:       vector.body:
; VF4IC4-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; VF4IC4-NEXT:    [[OFFSET_IDX:%.*]] = add i64 3, [[INDEX]]
; VF4IC4-NEXT:    [[TMP0:%.*]] = getelementptr inbounds i8, ptr [[P1]], i64 [[OFFSET_IDX]]
; VF4IC4-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[TMP0]], i32 0
; VF4IC4-NEXT:    [[WIDE_LOAD3:%.*]] = load <4 x i8>, ptr [[TMP1]], align 1
; VF4IC4-NEXT:    [[TMP18:%.*]] = getelementptr inbounds i8, ptr [[P2]], i64 [[OFFSET_IDX]]
; VF4IC4-NEXT:    [[TMP19:%.*]] = getelementptr inbounds i8, ptr [[TMP18]], i32 0
; VF4IC4-NEXT:    [[WIDE_LOAD7:%.*]] = load <4 x i8>, ptr [[TMP19]], align 1
; VF4IC4-NEXT:    [[TMP13:%.*]] = icmp ne <4 x i8> [[WIDE_LOAD3]], [[WIDE_LOAD7]]
; VF4IC4-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; VF4IC4-NEXT:    [[TMP5:%.*]] = call i1 @llvm.vector.reduce.or.v4i1(<4 x i1> [[TMP13]])
; VF4IC4-NEXT:    [[TMP6:%.*]] = icmp eq i64 [[INDEX_NEXT]], 64
; VF4IC4-NEXT:    [[TMP7:%.*]] = or i1 [[TMP5]], [[TMP6]]
; VF4IC4-NEXT:    br i1 [[TMP7]], label [[MIDDLE_SPLIT:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; VF4IC4:       middle.split:
; VF4IC4-NEXT:    br i1 [[TMP5]], label [[VECTOR_EARLY_EXIT:%.*]], label [[MIDDLE_BLOCK:%.*]]
; VF4IC4:       middle.block:
; VF4IC4-NEXT:    br i1 true, label [[LOOP_END:%.*]], label [[SCALAR_PH]]
; VF4IC4:       vector.early.exit:
; VF4IC4-NEXT:    [[TMP8:%.*]] = call i64 @llvm.experimental.cttz.elts.i64.v4i1(<4 x i1> [[TMP13]], i1 true)
; VF4IC4-NEXT:    [[TMP9:%.*]] = add i64 [[INDEX]], [[TMP8]]
; VF4IC4-NEXT:    [[TMP10:%.*]] = add i64 3, [[TMP9]]
; VF4IC4-NEXT:    br label [[LOOP_END]]
; VF4IC4:       scalar.ph:
; VF4IC4-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 67, [[MIDDLE_BLOCK]] ], [ 3, [[ENTRY:%.*]] ]
; VF4IC4-NEXT:    br label [[LOOP:%.*]]
; VF4IC4:       loop:
; VF4IC4-NEXT:    [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP_INC:%.*]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
; VF4IC4-NEXT:    [[GEP_P1:%.*]] = getelementptr inbounds i8, ptr [[P1]], i64 [[IV]]
; VF4IC4-NEXT:    [[LD1:%.*]] = load i8, ptr [[GEP_P1]], align 1
; VF4IC4-NEXT:    [[GEP_P2:%.*]] = getelementptr inbounds i8, ptr [[P2]], i64 [[IV]]
; VF4IC4-NEXT:    [[LD2:%.*]] = load i8, ptr [[GEP_P2]], align 1
; VF4IC4-NEXT:    [[CMP3:%.*]] = icmp eq i8 [[LD1]], [[LD2]]
; VF4IC4-NEXT:    br i1 [[CMP3]], label [[LOOP_INC]], label [[LOOP_END]]
; VF4IC4:       loop.inc:
; VF4IC4-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
; VF4IC4-NEXT:    [[EXITCOND:%.*]] = icmp ne i64 [[IV_NEXT]], 67
; VF4IC4-NEXT:    br i1 [[EXITCOND]], label [[LOOP]], label [[LOOP_END]], !llvm.loop [[LOOP5:![0-9]+]]
; VF4IC4:       loop.end:
; VF4IC4-NEXT:    [[RETVAL:%.*]] = phi i64 [ [[IV]], [[LOOP]] ], [ 67, [[LOOP_INC]] ], [ 67, [[MIDDLE_BLOCK]] ], [ [[TMP10]], [[VECTOR_EARLY_EXIT]] ]
; VF4IC4-NEXT:    ret i64 [[RETVAL]]
;
entry:
  %p1 = alloca [1024 x i8]
  %p2 = alloca [1024 x i8]
  call void @init_mem(ptr %p1, i64 1024)
  call void @init_mem(ptr %p2, i64 1024)
  br label %loop

loop:
  %iv = phi i64 [ %iv.next, %loop.inc ], [ 3, %entry ]
  %gep.p1 = getelementptr inbounds i8, ptr %p1, i64 %iv
  %ld1 = load i8, ptr %gep.p1, align 1
  %gep.p2 = getelementptr inbounds i8, ptr %p2, i64 %iv
  %ld2 = load i8, ptr %gep.p2, align 1
  %cmp3 = icmp eq i8 %ld1, %ld2
  br i1 %cmp3, label %loop.inc, label %loop.end

loop.inc:
  %iv.next = add i64 %iv, 1
  %exitcond = icmp ne i64 %iv.next, 67
  br i1 %exitcond, label %loop, label %loop.end

loop.end:
  %retval = phi i64 [ %iv, %loop ], [ 67, %loop.inc ]
  ret i64 %retval
}

define ptr @same_exit_block_pre_inc_use1_ivptr() {
; VF4IC4-LABEL: define ptr @same_exit_block_pre_inc_use1_ivptr() {
; VF4IC4-NEXT:  entry:
; VF4IC4-NEXT:    [[P1:%.*]] = alloca [1024 x i8], align 1
; VF4IC4-NEXT:    call void @init_mem(ptr [[P1]], i64 1024)
; VF4IC4-NEXT:    [[PTREND:%.*]] = getelementptr i8, ptr [[P1]], i64 1024
; VF4IC4-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; VF4IC4:       vector.ph:
; VF4IC4-NEXT:    [[TMP0:%.*]] = getelementptr i8, ptr [[P1]], i64 1024
; VF4IC4-NEXT:    br label [[VECTOR_BODY:%.*]]
; VF4IC4:       vector.body:
; VF4IC4-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; VF4IC4-NEXT:    [[NEXT_GEP:%.*]] = getelementptr i8, ptr [[P1]], i64 [[INDEX]]
; VF4IC4-NEXT:    [[TMP1:%.*]] = getelementptr i8, ptr [[NEXT_GEP]], i32 0
; VF4IC4-NEXT:    [[WIDE_LOAD3:%.*]] = load <4 x i8>, ptr [[TMP1]], align 1
; VF4IC4-NEXT:    [[TMP17:%.*]] = icmp ne <4 x i8> [[WIDE_LOAD3]], splat (i8 72)
; VF4IC4-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; VF4IC4-NEXT:    [[TMP3:%.*]] = call i1 @llvm.vector.reduce.or.v4i1(<4 x i1> [[TMP17]])
; VF4IC4-NEXT:    [[TMP4:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1024
; VF4IC4-NEXT:    [[TMP5:%.*]] = or i1 [[TMP3]], [[TMP4]]
; VF4IC4-NEXT:    br i1 [[TMP5]], label [[MIDDLE_SPLIT:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP6:![0-9]+]]
; VF4IC4:       middle.split:
; VF4IC4-NEXT:    br i1 [[TMP3]], label [[VECTOR_EARLY_EXIT:%.*]], label [[MIDDLE_BLOCK:%.*]]
; VF4IC4:       middle.block:
; VF4IC4-NEXT:    br i1 true, label [[LOOP_END:%.*]], label [[SCALAR_PH]]
; VF4IC4:       vector.early.exit:
; VF4IC4-NEXT:    [[TMP6:%.*]] = call i64 @llvm.experimental.cttz.elts.i64.v4i1(<4 x i1> [[TMP17]], i1 true)
; VF4IC4-NEXT:    [[TMP7:%.*]] = add i64 [[INDEX]], [[TMP6]]
; VF4IC4-NEXT:    [[TMP8:%.*]] = getelementptr i8, ptr [[P1]], i64 [[TMP7]]
; VF4IC4-NEXT:    br label [[LOOP_END]]
; VF4IC4:       scalar.ph:
; VF4IC4-NEXT:    [[BC_RESUME_VAL:%.*]] = phi ptr [ [[TMP0]], [[MIDDLE_BLOCK]] ], [ [[P1]], [[ENTRY:%.*]] ]
; VF4IC4-NEXT:    br label [[LOOP:%.*]]
; VF4IC4:       loop:
; VF4IC4-NEXT:    [[PTR:%.*]] = phi ptr [ [[PTR_NEXT:%.*]], [[LOOP_INC:%.*]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
; VF4IC4-NEXT:    [[LD1:%.*]] = load i8, ptr [[PTR]], align 1
; VF4IC4-NEXT:    [[CMP3:%.*]] = icmp eq i8 [[LD1]], 72
; VF4IC4-NEXT:    br i1 [[CMP3]], label [[LOOP_INC]], label [[LOOP_END]]
; VF4IC4:       loop.inc:
; VF4IC4-NEXT:    [[PTR_NEXT]] = getelementptr inbounds i8, ptr [[PTR]], i64 1
; VF4IC4-NEXT:    [[EXITCOND:%.*]] = icmp ne ptr [[PTR_NEXT]], [[PTREND]]
; VF4IC4-NEXT:    br i1 [[EXITCOND]], label [[LOOP]], label [[LOOP_END]], !llvm.loop [[LOOP7:![0-9]+]]
; VF4IC4:       loop.end:
; VF4IC4-NEXT:    [[RETVAL:%.*]] = phi ptr [ [[PTR]], [[LOOP]] ], [ [[PTREND]], [[LOOP_INC]] ], [ [[PTREND]], [[MIDDLE_BLOCK]] ], [ [[TMP8]], [[VECTOR_EARLY_EXIT]] ]
; VF4IC4-NEXT:    ret ptr [[RETVAL]]
;
entry:
  %p1 = alloca [1024 x i8]
  call void @init_mem(ptr %p1, i64 1024)
  %ptrend = getelementptr i8, ptr %p1, i64 1024
  br label %loop

loop:
  %ptr = phi ptr [ %ptr.next, %loop.inc ], [ %p1, %entry ]
  %ld1 = load i8, ptr %ptr, align 1
  %cmp3 = icmp eq i8 %ld1, 72
  br i1 %cmp3, label %loop.inc, label %loop.end

loop.inc:
  %ptr.next = getelementptr inbounds i8, ptr %ptr, i64 1
  %exitcond = icmp ne ptr %ptr.next, %ptrend
  br i1 %exitcond, label %loop, label %loop.end

loop.end:
  %retval = phi ptr [ %ptr, %loop ], [ %ptrend, %loop.inc ]
  ret ptr %retval
}

define i64 @same_exit_block_post_inc_use() {
; VF4IC4-LABEL: define i64 @same_exit_block_post_inc_use() {
; VF4IC4-NEXT:  entry:
; VF4IC4-NEXT:    [[P1:%.*]] = alloca [1024 x i8], align 1
; VF4IC4-NEXT:    [[P2:%.*]] = alloca [1024 x i8], align 1
; VF4IC4-NEXT:    call void @init_mem(ptr [[P1]], i64 1024)
; VF4IC4-NEXT:    call void @init_mem(ptr [[P2]], i64 1024)
; VF4IC4-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; VF4IC4:       vector.ph:
; VF4IC4-NEXT:    br label [[VECTOR_BODY:%.*]]
; VF4IC4:       vector.body:
; VF4IC4-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; VF4IC4-NEXT:    [[OFFSET_IDX:%.*]] = add i64 3, [[INDEX]]
; VF4IC4-NEXT:    [[TMP0:%.*]] = getelementptr inbounds i8, ptr [[P1]], i64 [[OFFSET_IDX]]
; VF4IC4-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[TMP0]], i32 0
; VF4IC4-NEXT:    [[WIDE_LOAD3:%.*]] = load <4 x i8>, ptr [[TMP1]], align 1
; VF4IC4-NEXT:    [[TMP18:%.*]] = getelementptr inbounds i8, ptr [[P2]], i64 [[OFFSET_IDX]]
; VF4IC4-NEXT:    [[TMP19:%.*]] = getelementptr inbounds i8, ptr [[TMP18]], i32 0
; VF4IC4-NEXT:    [[WIDE_LOAD7:%.*]] = load <4 x i8>, ptr [[TMP19]], align 1
; VF4IC4-NEXT:    [[TMP13:%.*]] = icmp ne <4 x i8> [[WIDE_LOAD3]], [[WIDE_LOAD7]]
; VF4IC4-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; VF4IC4-NEXT:    [[TMP5:%.*]] = call i1 @llvm.vector.reduce.or.v4i1(<4 x i1> [[TMP13]])
; VF4IC4-NEXT:    [[TMP6:%.*]] = icmp eq i64 [[INDEX_NEXT]], 64
; VF4IC4-NEXT:    [[TMP7:%.*]] = or i1 [[TMP5]], [[TMP6]]
; VF4IC4-NEXT:    br i1 [[TMP7]], label [[MIDDLE_SPLIT:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP8:![0-9]+]]
; VF4IC4:       middle.split:
; VF4IC4-NEXT:    br i1 [[TMP5]], label [[VECTOR_EARLY_EXIT:%.*]], label [[MIDDLE_BLOCK:%.*]]
; VF4IC4:       middle.block:
; VF4IC4-NEXT:    br i1 true, label [[LOOP_END:%.*]], label [[SCALAR_PH]]
; VF4IC4:       vector.early.exit:
; VF4IC4-NEXT:    [[TMP8:%.*]] = call i64 @llvm.experimental.cttz.elts.i64.v4i1(<4 x i1> [[TMP13]], i1 true)
; VF4IC4-NEXT:    [[TMP9:%.*]] = add i64 [[INDEX]], [[TMP8]]
; VF4IC4-NEXT:    [[TMP10:%.*]] = add i64 3, [[TMP9]]
; VF4IC4-NEXT:    br label [[LOOP_END]]
; VF4IC4:       scalar.ph:
; VF4IC4-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 67, [[MIDDLE_BLOCK]] ], [ 3, [[ENTRY:%.*]] ]
; VF4IC4-NEXT:    br label [[LOOP:%.*]]
; VF4IC4:       loop:
; VF4IC4-NEXT:    [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP_INC:%.*]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
; VF4IC4-NEXT:    [[GEP_P1:%.*]] = getelementptr inbounds i8, ptr [[P1]], i64 [[IV]]
; VF4IC4-NEXT:    [[LD1:%.*]] = load i8, ptr [[GEP_P1]], align 1
; VF4IC4-NEXT:    [[GEP_P2:%.*]] = getelementptr inbounds i8, ptr [[P2]], i64 [[IV]]
; VF4IC4-NEXT:    [[LD2:%.*]] = load i8, ptr [[GEP_P2]], align 1
; VF4IC4-NEXT:    [[CMP3:%.*]] = icmp eq i8 [[LD1]], [[LD2]]
; VF4IC4-NEXT:    br i1 [[CMP3]], label [[LOOP_INC]], label [[LOOP_END]]
; VF4IC4:       loop.inc:
; VF4IC4-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
; VF4IC4-NEXT:    [[EXITCOND:%.*]] = icmp ne i64 [[IV_NEXT]], 67
; VF4IC4-NEXT:    br i1 [[EXITCOND]], label [[LOOP]], label [[LOOP_END]], !llvm.loop [[LOOP9:![0-9]+]]
; VF4IC4:       loop.end:
; VF4IC4-NEXT:    [[RETVAL:%.*]] = phi i64 [ [[IV]], [[LOOP]] ], [ [[IV_NEXT]], [[LOOP_INC]] ], [ 67, [[MIDDLE_BLOCK]] ], [ [[TMP10]], [[VECTOR_EARLY_EXIT]] ]
; VF4IC4-NEXT:    ret i64 [[RETVAL]]
;
entry:
  %p1 = alloca [1024 x i8]
  %p2 = alloca [1024 x i8]
  call void @init_mem(ptr %p1, i64 1024)
  call void @init_mem(ptr %p2, i64 1024)
  br label %loop

loop:
  %iv = phi i64 [ %iv.next, %loop.inc ], [ 3, %entry ]
  %gep.p1 = getelementptr inbounds i8, ptr %p1, i64 %iv
  %ld1 = load i8, ptr %gep.p1, align 1
  %gep.p2 = getelementptr inbounds i8, ptr %p2, i64 %iv
  %ld2 = load i8, ptr %gep.p2, align 1
  %cmp3 = icmp eq i8 %ld1, %ld2
  br i1 %cmp3, label %loop.inc, label %loop.end

loop.inc:
  %iv.next = add i64 %iv, 1
  %exitcond = icmp ne i64 %iv.next, 67
  br i1 %exitcond, label %loop, label %loop.end

loop.end:
  %retval = phi i64 [ %iv, %loop ], [ %iv.next, %loop.inc ]
  ret i64 %retval
}

define i64 @diff_exit_block_pre_inc_use1() {
; VF4IC4-LABEL: define i64 @diff_exit_block_pre_inc_use1() {
; VF4IC4-NEXT:  entry:
; VF4IC4-NEXT:    [[P1:%.*]] = alloca [1024 x i8], align 1
; VF4IC4-NEXT:    [[P2:%.*]] = alloca [1024 x i8], align 1
; VF4IC4-NEXT:    call void @init_mem(ptr [[P1]], i64 1024)
; VF4IC4-NEXT:    call void @init_mem(ptr [[P2]], i64 1024)
; VF4IC4-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; VF4IC4:       vector.ph:
; VF4IC4-NEXT:    br label [[VECTOR_BODY:%.*]]
; VF4IC4:       vector.body:
; VF4IC4-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; VF4IC4-NEXT:    [[OFFSET_IDX:%.*]] = add i64 3, [[INDEX]]
; VF4IC4-NEXT:    [[TMP0:%.*]] = getelementptr inbounds i8, ptr [[P1]], i64 [[OFFSET_IDX]]
; VF4IC4-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[TMP0]], i32 0
; VF4IC4-NEXT:    [[WIDE_LOAD3:%.*]] = load <4 x i8>, ptr [[TMP1]], align 1
; VF4IC4-NEXT:    [[TMP18:%.*]] = getelementptr inbounds i8, ptr [[P2]], i64 [[OFFSET_IDX]]
; VF4IC4-NEXT:    [[TMP19:%.*]] = getelementptr inbounds i8, ptr [[TMP18]], i32 0
; VF4IC4-NEXT:    [[WIDE_LOAD7:%.*]] = load <4 x i8>, ptr [[TMP19]], align 1
; VF4IC4-NEXT:    [[TMP13:%.*]] = icmp ne <4 x i8> [[WIDE_LOAD3]], [[WIDE_LOAD7]]
; VF4IC4-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; VF4IC4-NEXT:    [[TMP5:%.*]] = call i1 @llvm.vector.reduce.or.v4i1(<4 x i1> [[TMP13]])
; VF4IC4-NEXT:    [[TMP6:%.*]] = icmp eq i64 [[INDEX_NEXT]], 64
; VF4IC4-NEXT:    [[TMP7:%.*]] = or i1 [[TMP5]], [[TMP6]]
; VF4IC4-NEXT:    br i1 [[TMP7]], label [[MIDDLE_SPLIT:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP10:![0-9]+]]
; VF4IC4:       middle.split:
; VF4IC4-NEXT:    br i1 [[TMP5]], label [[VECTOR_EARLY_EXIT:%.*]], label [[MIDDLE_BLOCK:%.*]]
; VF4IC4:       middle.block:
; VF4IC4-NEXT:    br i1 true, label [[LOOP_END:%.*]], label [[SCALAR_PH]]
; VF4IC4:       vector.early.exit:
; VF4IC4-NEXT:    [[TMP8:%.*]] = call i64 @llvm.experimental.cttz.elts.i64.v4i1(<4 x i1> [[TMP13]], i1 true)
; VF4IC4-NEXT:    [[TMP9:%.*]] = add i64 [[INDEX]], [[TMP8]]
; VF4IC4-NEXT:    [[TMP10:%.*]] = add i64 3, [[TMP9]]
; VF4IC4-NEXT:    br label [[LOOP_EARLY_EXIT:%.*]]
; VF4IC4:       scalar.ph:
; VF4IC4-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 67, [[MIDDLE_BLOCK]] ], [ 3, [[ENTRY:%.*]] ]
; VF4IC4-NEXT:    br label [[LOOP:%.*]]
; VF4IC4:       loop:
; VF4IC4-NEXT:    [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP_INC:%.*]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
; VF4IC4-NEXT:    [[GEP_P1:%.*]] = getelementptr inbounds i8, ptr [[P1]], i64 [[IV]]
; VF4IC4-NEXT:    [[LD1:%.*]] = load i8, ptr [[GEP_P1]], align 1
; VF4IC4-NEXT:    [[GEP_P2:%.*]] = getelementptr inbounds i8, ptr [[P2]], i64 [[IV]]
; VF4IC4-NEXT:    [[LD2:%.*]] = load i8, ptr [[GEP_P2]], align 1
; VF4IC4-NEXT:    [[CMP3:%.*]] = icmp eq i8 [[LD1]], [[LD2]]
; VF4IC4-NEXT:    br i1 [[CMP3]], label [[LOOP_INC]], label [[LOOP_EARLY_EXIT]]
; VF4IC4:       loop.inc:
; VF4IC4-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
; VF4IC4-NEXT:    [[EXITCOND:%.*]] = icmp ne i64 [[IV_NEXT]], 67
; VF4IC4-NEXT:    br i1 [[EXITCOND]], label [[LOOP]], label [[LOOP_END]], !llvm.loop [[LOOP11:![0-9]+]]
; VF4IC4:       loop.early.exit:
; VF4IC4-NEXT:    [[RETVAL1:%.*]] = phi i64 [ [[IV]], [[LOOP]] ], [ [[TMP10]], [[VECTOR_EARLY_EXIT]] ]
; VF4IC4-NEXT:    ret i64 [[RETVAL1]]
; VF4IC4:       loop.end:
; VF4IC4-NEXT:    [[RETVAL2:%.*]] = phi i64 [ 67, [[LOOP_INC]] ], [ 67, [[MIDDLE_BLOCK]] ]
; VF4IC4-NEXT:    ret i64 [[RETVAL2]]
;
entry:
  %p1 = alloca [1024 x i8]
  %p2 = alloca [1024 x i8]
  call void @init_mem(ptr %p1, i64 1024)
  call void @init_mem(ptr %p2, i64 1024)
  br label %loop

loop:
  %iv = phi i64 [ %iv.next, %loop.inc ], [ 3, %entry ]
  %gep.p1 = getelementptr inbounds i8, ptr %p1, i64 %iv
  %ld1 = load i8, ptr %gep.p1, align 1
  %gep.p2 = getelementptr inbounds i8, ptr %p2, i64 %iv
  %ld2 = load i8, ptr %gep.p2, align 1
  %cmp3 = icmp eq i8 %ld1, %ld2
  br i1 %cmp3, label %loop.inc, label %loop.early.exit

loop.inc:
  %iv.next = add i64 %iv, 1
  %exitcond = icmp ne i64 %iv.next, 67
  br i1 %exitcond, label %loop, label %loop.end

loop.early.exit:
  %retval1 = phi i64 [ %iv, %loop ]
  ret i64 %retval1

loop.end:
  %retval2 = phi i64 [ 67, %loop.inc ]
  ret i64 %retval2
}

define i64 @diff_exit_block_post_inc_use1() {
; VF4IC4-LABEL: define i64 @diff_exit_block_post_inc_use1() {
; VF4IC4-NEXT:  entry:
; VF4IC4-NEXT:    [[P1:%.*]] = alloca [1024 x i8], align 1
; VF4IC4-NEXT:    [[P2:%.*]] = alloca [1024 x i8], align 1
; VF4IC4-NEXT:    call void @init_mem(ptr [[P1]], i64 1024)
; VF4IC4-NEXT:    call void @init_mem(ptr [[P2]], i64 1024)
; VF4IC4-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; VF4IC4:       vector.ph:
; VF4IC4-NEXT:    br label [[VECTOR_BODY:%.*]]
; VF4IC4:       vector.body:
; VF4IC4-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; VF4IC4-NEXT:    [[OFFSET_IDX:%.*]] = add i64 3, [[INDEX]]
; VF4IC4-NEXT:    [[TMP0:%.*]] = getelementptr inbounds i8, ptr [[P1]], i64 [[OFFSET_IDX]]
; VF4IC4-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[TMP0]], i32 0
; VF4IC4-NEXT:    [[WIDE_LOAD3:%.*]] = load <4 x i8>, ptr [[TMP1]], align 1
; VF4IC4-NEXT:    [[TMP18:%.*]] = getelementptr inbounds i8, ptr [[P2]], i64 [[OFFSET_IDX]]
; VF4IC4-NEXT:    [[TMP19:%.*]] = getelementptr inbounds i8, ptr [[TMP18]], i32 0
; VF4IC4-NEXT:    [[WIDE_LOAD7:%.*]] = load <4 x i8>, ptr [[TMP19]], align 1
; VF4IC4-NEXT:    [[TMP13:%.*]] = icmp ne <4 x i8> [[WIDE_LOAD3]], [[WIDE_LOAD7]]
; VF4IC4-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; VF4IC4-NEXT:    [[TMP5:%.*]] = call i1 @llvm.vector.reduce.or.v4i1(<4 x i1> [[TMP13]])
; VF4IC4-NEXT:    [[TMP6:%.*]] = icmp eq i64 [[INDEX_NEXT]], 64
; VF4IC4-NEXT:    [[TMP7:%.*]] = or i1 [[TMP5]], [[TMP6]]
; VF4IC4-NEXT:    br i1 [[TMP7]], label [[MIDDLE_SPLIT:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP12:![0-9]+]]
; VF4IC4:       middle.split:
; VF4IC4-NEXT:    br i1 [[TMP5]], label [[VECTOR_EARLY_EXIT:%.*]], label [[MIDDLE_BLOCK:%.*]]
; VF4IC4:       middle.block:
; VF4IC4-NEXT:    br i1 true, label [[LOOP_END:%.*]], label [[SCALAR_PH]]
; VF4IC4:       vector.early.exit:
; VF4IC4-NEXT:    [[TMP8:%.*]] = call i64 @llvm.experimental.cttz.elts.i64.v4i1(<4 x i1> [[TMP13]], i1 true)
; VF4IC4-NEXT:    [[TMP9:%.*]] = add i64 [[INDEX]], [[TMP8]]
; VF4IC4-NEXT:    [[TMP10:%.*]] = add i64 3, [[TMP9]]
; VF4IC4-NEXT:    br label [[LOOP_EARLY_EXIT:%.*]]
; VF4IC4:       scalar.ph:
; VF4IC4-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 67, [[MIDDLE_BLOCK]] ], [ 3, [[ENTRY:%.*]] ]
; VF4IC4-NEXT:    br label [[LOOP:%.*]]
; VF4IC4:       loop:
; VF4IC4-NEXT:    [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP_INC:%.*]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
; VF4IC4-NEXT:    [[GEP_P1:%.*]] = getelementptr inbounds i8, ptr [[P1]], i64 [[IV]]
; VF4IC4-NEXT:    [[LD1:%.*]] = load i8, ptr [[GEP_P1]], align 1
; VF4IC4-NEXT:    [[GEP_P2:%.*]] = getelementptr inbounds i8, ptr [[P2]], i64 [[IV]]
; VF4IC4-NEXT:    [[LD2:%.*]] = load i8, ptr [[GEP_P2]], align 1
; VF4IC4-NEXT:    [[CMP3:%.*]] = icmp eq i8 [[LD1]], [[LD2]]
; VF4IC4-NEXT:    br i1 [[CMP3]], label [[LOOP_INC]], label [[LOOP_EARLY_EXIT]]
; VF4IC4:       loop.inc:
; VF4IC4-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
; VF4IC4-NEXT:    [[EXITCOND:%.*]] = icmp ne i64 [[IV_NEXT]], 67
; VF4IC4-NEXT:    br i1 [[EXITCOND]], label [[LOOP]], label [[LOOP_END]], !llvm.loop [[LOOP13:![0-9]+]]
; VF4IC4:       loop.early.exit:
; VF4IC4-NEXT:    [[RETVAL1:%.*]] = phi i64 [ [[IV]], [[LOOP]] ], [ [[TMP10]], [[VECTOR_EARLY_EXIT]] ]
; VF4IC4-NEXT:    ret i64 [[RETVAL1]]
; VF4IC4:       loop.end:
; VF4IC4-NEXT:    [[RETVAL2:%.*]] = phi i64 [ [[IV_NEXT]], [[LOOP_INC]] ], [ 67, [[MIDDLE_BLOCK]] ]
; VF4IC4-NEXT:    ret i64 [[RETVAL2]]
;
entry:
  %p1 = alloca [1024 x i8]
  %p2 = alloca [1024 x i8]
  call void @init_mem(ptr %p1, i64 1024)
  call void @init_mem(ptr %p2, i64 1024)
  br label %loop

loop:
  %iv = phi i64 [ %iv.next, %loop.inc ], [ 3, %entry ]
  %gep.p1 = getelementptr inbounds i8, ptr %p1, i64 %iv
  %ld1 = load i8, ptr %gep.p1, align 1
  %gep.p2 = getelementptr inbounds i8, ptr %p2, i64 %iv
  %ld2 = load i8, ptr %gep.p2, align 1
  %cmp3 = icmp eq i8 %ld1, %ld2
  br i1 %cmp3, label %loop.inc, label %loop.early.exit

loop.inc:
  %iv.next = add i64 %iv, 1
  %exitcond = icmp ne i64 %iv.next, 67
  br i1 %exitcond, label %loop, label %loop.end

loop.early.exit:
  %retval1 = phi i64 [ %iv, %loop ]
  ret i64 %retval1

loop.end:
  %retval2 = phi i64 [ %iv.next, %loop.inc ]
  ret i64 %retval2
}

define i64 @same_exit_block_pre_inc_use1_reverse() {
; VF4IC4-LABEL: define i64 @same_exit_block_pre_inc_use1_reverse() {
; VF4IC4-NEXT:  entry:
; VF4IC4-NEXT:    [[P1:%.*]] = alloca [1024 x i8], align 1
; VF4IC4-NEXT:    [[P2:%.*]] = alloca [1024 x i8], align 1
; VF4IC4-NEXT:    call void @init_mem(ptr [[P1]], i64 1024)
; VF4IC4-NEXT:    call void @init_mem(ptr [[P2]], i64 1024)
; VF4IC4-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; VF4IC4:       vector.ph:
; VF4IC4-NEXT:    br label [[VECTOR_BODY:%.*]]
; VF4IC4:       vector.body:
; VF4IC4-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; VF4IC4-NEXT:    [[OFFSET_IDX:%.*]] = sub i64 1023, [[INDEX]]
; VF4IC4-NEXT:    [[TMP0:%.*]] = getelementptr inbounds i8, ptr [[P1]], i64 [[OFFSET_IDX]]
; VF4IC4-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[TMP0]], i32 0
; VF4IC4-NEXT:    [[TMP17:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i32 -3
; VF4IC4-NEXT:    [[WIDE_LOAD13:%.*]] = load <4 x i8>, ptr [[TMP17]], align 1
; VF4IC4-NEXT:    [[REVERSE14:%.*]] = shufflevector <4 x i8> [[WIDE_LOAD13]], <4 x i8> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; VF4IC4-NEXT:    [[TMP25:%.*]] = getelementptr inbounds i8, ptr [[P2]], i64 [[OFFSET_IDX]]
; VF4IC4-NEXT:    [[TMP26:%.*]] = getelementptr inbounds i8, ptr [[TMP25]], i32 0
; VF4IC4-NEXT:    [[TMP46:%.*]] = getelementptr inbounds i8, ptr [[TMP26]], i32 -3
; VF4IC4-NEXT:    [[WIDE_LOAD14:%.*]] = load <4 x i8>, ptr [[TMP46]], align 1
; VF4IC4-NEXT:    [[REVERSE15:%.*]] = shufflevector <4 x i8> [[WIDE_LOAD14]], <4 x i8> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; VF4IC4-NEXT:    [[TMP21:%.*]] = icmp ne <4 x i8> [[REVERSE14]], [[REVERSE15]]
; VF4IC4-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; VF4IC4-NEXT:    [[TMP7:%.*]] = call i1 @llvm.vector.reduce.or.v4i1(<4 x i1> [[TMP21]])
; VF4IC4-NEXT:    [[TMP8:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1020
; VF4IC4-NEXT:    [[TMP9:%.*]] = or i1 [[TMP7]], [[TMP8]]
; VF4IC4-NEXT:    br i1 [[TMP9]], label [[MIDDLE_SPLIT:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP14:![0-9]+]]
; VF4IC4:       middle.split:
; VF4IC4-NEXT:    br i1 [[TMP7]], label [[VECTOR_EARLY_EXIT:%.*]], label [[MIDDLE_BLOCK:%.*]]
; VF4IC4:       middle.block:
; VF4IC4-NEXT:    br i1 false, label [[LOOP_END:%.*]], label [[SCALAR_PH]]
; VF4IC4:       vector.early.exit:
; VF4IC4-NEXT:    [[TMP10:%.*]] = call i64 @llvm.experimental.cttz.elts.i64.v4i1(<4 x i1> [[TMP21]], i1 true)
; VF4IC4-NEXT:    [[TMP11:%.*]] = add i64 [[INDEX]], [[TMP10]]
; VF4IC4-NEXT:    [[TMP12:%.*]] = sub i64 1023, [[TMP11]]
; VF4IC4-NEXT:    br label [[LOOP_END]]
; VF4IC4:       scalar.ph:
; VF4IC4-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 3, [[MIDDLE_BLOCK]] ], [ 1023, [[ENTRY:%.*]] ]
; VF4IC4-NEXT:    br label [[LOOP:%.*]]
; VF4IC4:       loop:
; VF4IC4-NEXT:    [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP_INC:%.*]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
; VF4IC4-NEXT:    [[GEP_P1:%.*]] = getelementptr inbounds i8, ptr [[P1]], i64 [[IV]]
; VF4IC4-NEXT:    [[LD1:%.*]] = load i8, ptr [[GEP_P1]], align 1
; VF4IC4-NEXT:    [[GEP_P2:%.*]] = getelementptr inbounds i8, ptr [[P2]], i64 [[IV]]
; VF4IC4-NEXT:    [[LD2:%.*]] = load i8, ptr [[GEP_P2]], align 1
; VF4IC4-NEXT:    [[CMP3:%.*]] = icmp eq i8 [[LD1]], [[LD2]]
; VF4IC4-NEXT:    br i1 [[CMP3]], label [[LOOP_INC]], label [[LOOP_END]]
; VF4IC4:       loop.inc:
; VF4IC4-NEXT:    [[IV_NEXT]] = add i64 [[IV]], -1
; VF4IC4-NEXT:    [[EXITCOND:%.*]] = icmp eq i64 [[IV_NEXT]], 0
; VF4IC4-NEXT:    br i1 [[EXITCOND]], label [[LOOP_END]], label [[LOOP]], !llvm.loop [[LOOP15:![0-9]+]]
; VF4IC4:       loop.end:
; VF4IC4-NEXT:    [[RETVAL:%.*]] = phi i64 [ [[IV]], [[LOOP]] ], [ 1024, [[LOOP_INC]] ], [ 1024, [[MIDDLE_BLOCK]] ], [ [[TMP12]], [[VECTOR_EARLY_EXIT]] ]
; VF4IC4-NEXT:    ret i64 [[RETVAL]]
;
entry:
  %p1 = alloca [1024 x i8]
  %p2 = alloca [1024 x i8]
  call void @init_mem(ptr %p1, i64 1024)
  call void @init_mem(ptr %p2, i64 1024)
  br label %loop

loop:
  %iv = phi i64 [ %iv.next, %loop.inc ], [ 1023, %entry ]
  %gep.p1 = getelementptr inbounds i8, ptr %p1, i64 %iv
  %ld1 = load i8, ptr %gep.p1, align 1
  %gep.p2 = getelementptr inbounds i8, ptr %p2, i64 %iv
  %ld2 = load i8, ptr %gep.p2, align 1
  %cmp3 = icmp eq i8 %ld1, %ld2
  br i1 %cmp3, label %loop.inc, label %loop.end

loop.inc:
  %iv.next = add i64 %iv, -1
  %exitcond = icmp eq i64 %iv.next, 0
  br i1 %exitcond, label %loop.end, label %loop

loop.end:
  %retval = phi i64 [ %iv, %loop ], [ 1024, %loop.inc ]
  ret i64 %retval
}

; FIXME: Extracts incorrect lane if early exit is taken.
define i8 @same_exit_block_use_loaded_value() {
; VF4IC4-LABEL: define i8 @same_exit_block_use_loaded_value() {
; VF4IC4-NEXT:  entry:
; VF4IC4-NEXT:    [[P1:%.*]] = alloca [1024 x i8], align 1
; VF4IC4-NEXT:    [[P2:%.*]] = alloca [1024 x i8], align 1
; VF4IC4-NEXT:    call void @init_mem(ptr [[P1]], i64 1024)
; VF4IC4-NEXT:    call void @init_mem(ptr [[P2]], i64 1024)
; VF4IC4-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; VF4IC4:       vector.ph:
; VF4IC4-NEXT:    br label [[VECTOR_BODY:%.*]]
; VF4IC4:       vector.body:
; VF4IC4-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; VF4IC4-NEXT:    [[TMP0:%.*]] = getelementptr inbounds i8, ptr [[P1]], i64 [[INDEX]]
; VF4IC4-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[TMP0]], i32 0
; VF4IC4-NEXT:    [[WIDE_LOAD3:%.*]] = load <4 x i8>, ptr [[TMP1]], align 1
; VF4IC4-NEXT:    [[TMP18:%.*]] = getelementptr inbounds i8, ptr [[P2]], i64 [[INDEX]]
; VF4IC4-NEXT:    [[TMP19:%.*]] = getelementptr inbounds i8, ptr [[TMP18]], i32 0
; VF4IC4-NEXT:    [[WIDE_LOAD7:%.*]] = load <4 x i8>, ptr [[TMP19]], align 1
; VF4IC4-NEXT:    [[TMP13:%.*]] = icmp ne <4 x i8> [[WIDE_LOAD3]], [[WIDE_LOAD7]]
; VF4IC4-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; VF4IC4-NEXT:    [[TMP5:%.*]] = call i1 @llvm.vector.reduce.or.v4i1(<4 x i1> [[TMP13]])
; VF4IC4-NEXT:    [[TMP6:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1024
; VF4IC4-NEXT:    [[TMP7:%.*]] = or i1 [[TMP5]], [[TMP6]]
; VF4IC4-NEXT:    br i1 [[TMP7]], label [[MIDDLE_SPLIT:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP16:![0-9]+]]
; VF4IC4:       middle.split:
; VF4IC4-NEXT:    br i1 [[TMP5]], label [[VECTOR_EARLY_EXIT:%.*]], label [[MIDDLE_BLOCK:%.*]]
; VF4IC4:       middle.block:
; VF4IC4-NEXT:    br i1 true, label [[LOOP_END:%.*]], label [[SCALAR_PH]]
; VF4IC4:       vector.early.exit:
; VF4IC4-NEXT:    [[FIRST_ACTIVE_LANE1:%.*]] = call i64 @llvm.experimental.cttz.elts.i64.v4i1(<4 x i1> [[TMP13]], i1 true)
; VF4IC4-NEXT:    [[EARLY_EXIT_VALUE:%.*]] = extractelement <4 x i8> [[WIDE_LOAD3]], i64 [[FIRST_ACTIVE_LANE1]]
; VF4IC4-NEXT:    br label [[LOOP_END]]
; VF4IC4:       scalar.ph:
; VF4IC4-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 1024, [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
; VF4IC4-NEXT:    br label [[LOOP:%.*]]
; VF4IC4:       loop:
; VF4IC4-NEXT:    [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP_INC:%.*]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
; VF4IC4-NEXT:    [[GEP_P1:%.*]] = getelementptr inbounds i8, ptr [[P1]], i64 [[IV]]
; VF4IC4-NEXT:    [[LD1:%.*]] = load i8, ptr [[GEP_P1]], align 1
; VF4IC4-NEXT:    [[GEP_P2:%.*]] = getelementptr inbounds i8, ptr [[P2]], i64 [[IV]]
; VF4IC4-NEXT:    [[LD2:%.*]] = load i8, ptr [[GEP_P2]], align 1
; VF4IC4-NEXT:    [[CMP3:%.*]] = icmp eq i8 [[LD1]], [[LD2]]
; VF4IC4-NEXT:    br i1 [[CMP3]], label [[LOOP_INC]], label [[LOOP_END]]
; VF4IC4:       loop.inc:
; VF4IC4-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
; VF4IC4-NEXT:    [[EXITCOND:%.*]] = icmp eq i64 [[IV_NEXT]], 1024
; VF4IC4-NEXT:    br i1 [[EXITCOND]], label [[LOOP_END]], label [[LOOP]], !llvm.loop [[LOOP17:![0-9]+]]
; VF4IC4:       loop.end:
; VF4IC4-NEXT:    [[RETVAL:%.*]] = phi i8 [ [[LD1]], [[LOOP]] ], [ -1, [[LOOP_INC]] ], [ -1, [[MIDDLE_BLOCK]] ], [ [[EARLY_EXIT_VALUE]], [[VECTOR_EARLY_EXIT]] ]
; VF4IC4-NEXT:    ret i8 [[RETVAL]]
;
entry:
  %p1 = alloca [1024 x i8]
  %p2 = alloca [1024 x i8]
  call void @init_mem(ptr %p1, i64 1024)
  call void @init_mem(ptr %p2, i64 1024)
  br label %loop

loop:
  %iv = phi i64 [ %iv.next, %loop.inc ], [ 0, %entry ]
  %gep.p1 = getelementptr inbounds i8, ptr %p1, i64 %iv
  %ld1 = load i8, ptr %gep.p1, align 1
  %gep.p2 = getelementptr inbounds i8, ptr %p2, i64 %iv
  %ld2 = load i8, ptr %gep.p2, align 1
  %cmp3 = icmp eq i8 %ld1, %ld2
  br i1 %cmp3, label %loop.inc, label %loop.end

loop.inc:
  %iv.next = add i64 %iv, 1
  %exitcond = icmp eq i64 %iv.next, 1024
  br i1 %exitcond, label %loop.end, label %loop

loop.end:
  %retval = phi i8 [ %ld1, %loop ], [ -1, %loop.inc ]
  ret i8 %retval
}

; FIXME: Extracts incorrect lane if early exit is taken.
define i8 @same_exit_block_reverse_use_loaded_value() {
; VF4IC4-LABEL: define i8 @same_exit_block_reverse_use_loaded_value() {
; VF4IC4-NEXT:  entry:
; VF4IC4-NEXT:    [[P1:%.*]] = alloca [1024 x i8], align 1
; VF4IC4-NEXT:    [[P2:%.*]] = alloca [1024 x i8], align 1
; VF4IC4-NEXT:    call void @init_mem(ptr [[P1]], i64 1024)
; VF4IC4-NEXT:    call void @init_mem(ptr [[P2]], i64 1024)
; VF4IC4-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; VF4IC4:       vector.ph:
; VF4IC4-NEXT:    br label [[VECTOR_BODY:%.*]]
; VF4IC4:       vector.body:
; VF4IC4-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; VF4IC4-NEXT:    [[OFFSET_IDX:%.*]] = sub i64 1023, [[INDEX]]
; VF4IC4-NEXT:    [[TMP0:%.*]] = getelementptr inbounds i8, ptr [[P1]], i64 [[OFFSET_IDX]]
; VF4IC4-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[TMP0]], i32 0
; VF4IC4-NEXT:    [[TMP8:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i32 -3
; VF4IC4-NEXT:    [[WIDE_LOAD5:%.*]] = load <4 x i8>, ptr [[TMP8]], align 1
; VF4IC4-NEXT:    [[REVERSE6:%.*]] = shufflevector <4 x i8> [[WIDE_LOAD5]], <4 x i8> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; VF4IC4-NEXT:    [[TMP9:%.*]] = getelementptr inbounds i8, ptr [[P2]], i64 [[OFFSET_IDX]]
; VF4IC4-NEXT:    [[TMP38:%.*]] = getelementptr inbounds i8, ptr [[TMP9]], i32 0
; VF4IC4-NEXT:    [[TMP17:%.*]] = getelementptr inbounds i8, ptr [[TMP38]], i32 -3
; VF4IC4-NEXT:    [[WIDE_LOAD13:%.*]] = load <4 x i8>, ptr [[TMP17]], align 1
; VF4IC4-NEXT:    [[REVERSE14:%.*]] = shufflevector <4 x i8> [[WIDE_LOAD13]], <4 x i8> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; VF4IC4-NEXT:    [[TMP21:%.*]] = icmp ne <4 x i8> [[REVERSE6]], [[REVERSE14]]
; VF4IC4-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; VF4IC4-NEXT:    [[TMP25:%.*]] = call i1 @llvm.vector.reduce.or.v4i1(<4 x i1> [[TMP21]])
; VF4IC4-NEXT:    [[TMP26:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1020
; VF4IC4-NEXT:    [[TMP27:%.*]] = or i1 [[TMP25]], [[TMP26]]
; VF4IC4-NEXT:    br i1 [[TMP27]], label [[MIDDLE_SPLIT:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP18:![0-9]+]]
; VF4IC4:       middle.split:
; VF4IC4-NEXT:    br i1 [[TMP25]], label [[VECTOR_EARLY_EXIT:%.*]], label [[MIDDLE_BLOCK:%.*]]
; VF4IC4:       middle.block:
; VF4IC4-NEXT:    br i1 false, label [[LOOP_END:%.*]], label [[SCALAR_PH]]
; VF4IC4:       vector.early.exit:
; VF4IC4-NEXT:    [[FIRST_ACTIVE_LANE1:%.*]] = call i64 @llvm.experimental.cttz.elts.i64.v4i1(<4 x i1> [[TMP21]], i1 true)
; VF4IC4-NEXT:    [[EARLY_EXIT_VALUE:%.*]] = extractelement <4 x i8> [[REVERSE6]], i64 [[FIRST_ACTIVE_LANE1]]
; VF4IC4-NEXT:    br label [[LOOP_END]]
; VF4IC4:       scalar.ph:
; VF4IC4-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 3, [[MIDDLE_BLOCK]] ], [ 1023, [[ENTRY:%.*]] ]
; VF4IC4-NEXT:    br label [[LOOP:%.*]]
; VF4IC4:       loop:
; VF4IC4-NEXT:    [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP_INC:%.*]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
; VF4IC4-NEXT:    [[GEP_P1:%.*]] = getelementptr inbounds i8, ptr [[P1]], i64 [[IV]]
; VF4IC4-NEXT:    [[LD1:%.*]] = load i8, ptr [[GEP_P1]], align 1
; VF4IC4-NEXT:    [[GEP_P2:%.*]] = getelementptr inbounds i8, ptr [[P2]], i64 [[IV]]
; VF4IC4-NEXT:    [[LD2:%.*]] = load i8, ptr [[GEP_P2]], align 1
; VF4IC4-NEXT:    [[CMP3:%.*]] = icmp eq i8 [[LD1]], [[LD2]]
; VF4IC4-NEXT:    br i1 [[CMP3]], label [[LOOP_INC]], label [[LOOP_END]]
; VF4IC4:       loop.inc:
; VF4IC4-NEXT:    [[IV_NEXT]] = add i64 [[IV]], -1
; VF4IC4-NEXT:    [[EXITCOND:%.*]] = icmp eq i64 [[IV_NEXT]], 0
; VF4IC4-NEXT:    br i1 [[EXITCOND]], label [[LOOP_END]], label [[LOOP]], !llvm.loop [[LOOP19:![0-9]+]]
; VF4IC4:       loop.end:
; VF4IC4-NEXT:    [[RETVAL:%.*]] = phi i8 [ [[LD1]], [[LOOP]] ], [ -1, [[LOOP_INC]] ], [ -1, [[MIDDLE_BLOCK]] ], [ [[EARLY_EXIT_VALUE]], [[VECTOR_EARLY_EXIT]] ]
; VF4IC4-NEXT:    ret i8 [[RETVAL]]
;
entry:
  %p1 = alloca [1024 x i8]
  %p2 = alloca [1024 x i8]
  call void @init_mem(ptr %p1, i64 1024)
  call void @init_mem(ptr %p2, i64 1024)
  br label %loop

loop:
  %iv = phi i64 [ %iv.next, %loop.inc ], [ 1023, %entry ]
  %gep.p1 = getelementptr inbounds i8, ptr %p1, i64 %iv
  %ld1 = load i8, ptr %gep.p1, align 1
  %gep.p2 = getelementptr inbounds i8, ptr %p2, i64 %iv
  %ld2 = load i8, ptr %gep.p2, align 1
  %cmp3 = icmp eq i8 %ld1, %ld2
  br i1 %cmp3, label %loop.inc, label %loop.end

loop.inc:
  %iv.next = add i64 %iv, -1
  %exitcond = icmp eq i64 %iv.next, 0
  br i1 %exitcond, label %loop.end, label %loop

loop.end:
  %retval = phi i8 [ %ld1, %loop ], [ -1, %loop.inc ]
  ret i8 %retval
}