llvm/test/Transforms/SimpleLoopUnswitch/pr117537.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt -S -passes='print<scalar-evolution>,simple-loop-unswitch<nontrivial>,print<scalar-evolution>' -verify-scev < %s 2>/dev/null | FileCheck %s

; Make sure we don't assert due to insufficient SCEV invalidation.

define void @test(ptr %p) {
; CHECK-LABEL: define void @test(
; CHECK-SAME: ptr [[P:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[CHECK:%.*]] = icmp eq ptr [[P]], null
; CHECK-NEXT:    br i1 [[CHECK]], label %[[ENTRY_SPLIT_US:.*]], label %[[ENTRY_SPLIT:.*]]
; CHECK:       [[ENTRY_SPLIT_US]]:
; CHECK-NEXT:    br label %[[BB0_US:.*]]
; CHECK:       [[BB0_US]]:
; CHECK-NEXT:    br label %[[LOOP0_US:.*]]
; CHECK:       [[LOOP0_US]]:
; CHECK-NEXT:    [[V_US:%.*]] = load atomic i32, ptr [[P]] unordered, align 8
; CHECK-NEXT:    [[ADD_US:%.*]] = add i32 [[V_US]], 3
; CHECK-NEXT:    br i1 true, label %[[PREHEADER_SPLIT_US:.*]], label %[[BB0_US]]
; CHECK:       [[PREHEADER_SPLIT_US]]:
; CHECK-NEXT:    [[ADD_LCSSA_US:%.*]] = phi i32 [ [[ADD_US]], %[[LOOP0_US]] ]
; CHECK-NEXT:    br label %[[PREHEADER:.*]]
; CHECK:       [[ENTRY_SPLIT]]:
; CHECK-NEXT:    br label %[[BB0:.*]]
; CHECK:       [[BB0]]:
; CHECK-NEXT:    br label %[[LATCH:.*]]
; CHECK:       [[LATCH]]:
; CHECK-NEXT:    br i1 false, label %[[EXIT0:.*]], label %[[LOOP0:.*]]
; CHECK:       [[EXIT0]]:
; CHECK-NEXT:    ret void
; CHECK:       [[LOOP0]]:
; CHECK-NEXT:    [[V:%.*]] = load atomic i32, ptr [[P]] unordered, align 8
; CHECK-NEXT:    [[ADD:%.*]] = add i32 [[V]], 3
; CHECK-NEXT:    br i1 true, label %[[PREHEADER_SPLIT:.*]], label %[[BB0]]
; CHECK:       [[PREHEADER_SPLIT]]:
; CHECK-NEXT:    [[ADD_LCSSA:%.*]] = phi i32 [ [[ADD]], %[[LOOP0]] ]
; CHECK-NEXT:    br label %[[PREHEADER]]
; CHECK:       [[PREHEADER]]:
; CHECK-NEXT:    [[DOTUS_PHI:%.*]] = phi i32 [ [[ADD_LCSSA]], %[[PREHEADER_SPLIT]] ], [ [[ADD_LCSSA_US]], %[[PREHEADER_SPLIT_US]] ]
; CHECK-NEXT:    br label %[[LOOP1:.*]]
; CHECK:       [[LOOP1]]:
; CHECK-NEXT:    [[IV1:%.*]] = phi i32 [ [[DOTUS_PHI]], %[[PREHEADER]] ], [ [[IV1_NEXT:%.*]], %[[BACKEDGE:.*]] ]
; CHECK-NEXT:    [[IV1_NEXT]] = add i32 [[IV1]], -33
; CHECK-NEXT:    br label %[[LOOP2:.*]]
; CHECK:       [[BACKEDGE]]:
; CHECK-NEXT:    br i1 true, label %[[EXIT1:.*]], label %[[LOOP1]]
; CHECK:       [[LOOP2]]:
; CHECK-NEXT:    [[IV0:%.*]] = phi i32 [ [[IV1]], %[[LOOP1]] ], [ [[IV0_NEXT:%.*]], %[[LOOP2]] ]
; CHECK-NEXT:    [[IV0_NEXT]] = add nsw i32 [[IV0]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i32 [[IV0_NEXT]], 0
; CHECK-NEXT:    br i1 [[CMP]], label %[[BACKEDGE]], label %[[LOOP2]]
; CHECK:       [[EXIT1]]:
; CHECK-NEXT:    ret void
;
entry:
  %check = icmp eq ptr %p, null
  br label %bb0

bb0:                                              ; preds = %loop0, %entry
  br i1 %check, label %loop0, label %latch

latch:                                            ; preds = %bb0
  br i1 %check, label %exit0, label %loop0

exit0:                                            ; preds = %latch
  ret void

loop0:                                            ; preds = %latch, %bb0
  %v = load atomic i32, ptr %p unordered, align 8
  %add = add i32 %v, 3
  br i1 true, label %preheader, label %bb0

preheader:                                        ; preds = %loop0
  br label %loop1

loop1:                                            ; preds = %backedge, %preheader
  %iv1 = phi i32 [ %add, %preheader ], [ %iv1.next, %backedge ]
  %iv1.next = add i32 %iv1, -33
  br label %loop2

backedge:                                         ; preds = %loop2
  br i1 true, label %exit1, label %loop1

loop2:                                            ; preds = %loop2, %loop1
  %iv0 = phi i32 [ %iv1, %loop1 ], [ %iv0.next, %loop2 ]
  %iv0.next = add nsw i32 %iv0, 1
  %cmp = icmp sgt i32 %iv0.next, 0
  br i1 %cmp, label %backedge, label %loop2

exit1:                                            ; preds = %backedge
  ret void
}