; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -O2 < %s | FileCheck %s
; RUN: opt -S -passes='default<O2>' < %s | FileCheck %s

; FIXME: The br -> switch conversion blocks loop rotation.

define i64 @test() {
; CHECK-LABEL: @test(
; CHECK-NEXT:  start:
; CHECK-NEXT:    br label [[BB10:%.*]]
; CHECK:       bb10:
; CHECK-NEXT:    [[ITER1_SROA_5_0:%.*]] = phi i64 [ 100000, [[START:%.*]] ], [ [[SPEC_SELECT:%.*]], [[BB3_I_I:%.*]] ]
; CHECK-NEXT:    [[ITER1_SROA_9_0:%.*]] = phi i8 [ 2, [[START]] ], [ [[TMP3:%.*]], [[BB3_I_I]] ]
; CHECK-NEXT:    [[COUNT_1:%.*]] = phi i64 [ 0, [[START]] ], [ [[TMP4:%.*]], [[BB3_I_I]] ]
; CHECK-NEXT:    switch i8 [[ITER1_SROA_9_0]], label [[BB12:%.*]] [
; CHECK-NEXT:    i8 2, label [[BB3_I_I]]
; CHECK-NEXT:    i8 0, label [[BB3_I_I]]
; CHECK-NEXT:    ]
; CHECK:       bb3.i.i:
; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq i64 [[ITER1_SROA_5_0]], 0
; CHECK-NEXT:    [[TMP3]] = zext i1 [[TMP2]] to i8
; CHECK-NEXT:    [[SPEC_SELECT]] = tail call i64 @llvm.usub.sat.i64(i64 [[ITER1_SROA_5_0]], i64 1)
; CHECK-NEXT:    [[TMP4]] = add i64 [[COUNT_1]], [[ITER1_SROA_5_0]]
; CHECK-NEXT:    br label [[BB10]]
; CHECK:       bb12:
; CHECK-NEXT:    ret i64 [[COUNT_1]]
;
start:
  br label %bb10

bb10:                                             ; preds = %bb3.i.i, %bb6
  %iter1.sroa.5.0 = phi i64 [ 100000, %start ], [ %spec.select, %bb3.i.i ]
  %iter1.sroa.9.0 = phi i8 [ 2, %start ], [ %tmp3, %bb3.i.i ]
  %count.1 = phi i64 [ 0, %start ], [ %tmp4, %bb3.i.i ]
  %c1 = icmp eq i8 %iter1.sroa.9.0, 2
  %c2 = icmp eq i8 %iter1.sroa.9.0, 0
  %c3 = or i1 %c1, %c2
  br i1 %c3, label %bb3.i.i, label %bb12

bb3.i.i:                                          ; preds = %bb10, %bb10
  %tmp2 = icmp eq i64 %iter1.sroa.5.0, 0
  %tmp3 = zext i1 %tmp2 to i8
  %_5.0.i.i.i.i = add i64 %iter1.sroa.5.0, -1
  %spec.select = select i1 %tmp2, i64 0, i64 %_5.0.i.i.i.i

  %tmp4 = add i64 %count.1, %iter1.sroa.5.0
  br label %bb10

bb12:                                             ; preds = %bb10
  ret i64 %count.1
}