; LLVM IR from tangjz/acm-icpc :: lydsy/2179.ll (Z5RaderPii)

; Unoptimized IR (clang -disable-llvm-passes):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z5RaderPii(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 1, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  %8 = load i32, ptr %4, align 4, !tbaa !9
  %9 = ashr i32 %8, 1
  store i32 %9, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  br label %10

10:                                               ; preds = %51, %2
  %11 = load i32, ptr %5, align 4, !tbaa !9
  %12 = load i32, ptr %4, align 4, !tbaa !9
  %13 = sub nsw i32 %12, 1
  %14 = icmp slt i32 %11, %13
  br i1 %14, label %16, label %15

15:                                               ; preds = %10
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  br label %54

16:                                               ; preds = %10
  %17 = load i32, ptr %5, align 4, !tbaa !9
  %18 = load i32, ptr %6, align 4, !tbaa !9
  %19 = icmp slt i32 %17, %18
  br i1 %19, label %20, label %29

20:                                               ; preds = %16
  %21 = load ptr, ptr %3, align 8, !tbaa !5
  %22 = load i32, ptr %5, align 4, !tbaa !9
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds i32, ptr %21, i64 %23
  %25 = load ptr, ptr %3, align 8, !tbaa !5
  %26 = load i32, ptr %6, align 4, !tbaa !9
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds i32, ptr %25, i64 %27
  call void @_Z4swapIiEvRT_S1_(ptr noundef nonnull align 4 dereferenceable(4) %24, ptr noundef nonnull align 4 dereferenceable(4) %28)
  br label %29

29:                                               ; preds = %20, %16
  %30 = load i32, ptr %4, align 4, !tbaa !9
  %31 = ashr i32 %30, 1
  store i32 %31, ptr %7, align 4, !tbaa !9
  br label %32

32:                                               ; preds = %36, %29
  %33 = load i32, ptr %6, align 4, !tbaa !9
  %34 = load i32, ptr %7, align 4, !tbaa !9
  %35 = icmp sge i32 %33, %34
  br i1 %35, label %36, label %42

36:                                               ; preds = %32
  %37 = load i32, ptr %7, align 4, !tbaa !9
  %38 = load i32, ptr %6, align 4, !tbaa !9
  %39 = sub nsw i32 %38, %37
  store i32 %39, ptr %6, align 4, !tbaa !9
  %40 = load i32, ptr %7, align 4, !tbaa !9
  %41 = ashr i32 %40, 1
  store i32 %41, ptr %7, align 4, !tbaa !9
  br label %32, !llvm.loop !11

42:                                               ; preds = %32
  %43 = load i32, ptr %6, align 4, !tbaa !9
  %44 = load i32, ptr %7, align 4, !tbaa !9
  %45 = icmp slt i32 %43, %44
  br i1 %45, label %46, label %50

46:                                               ; preds = %42
  %47 = load i32, ptr %7, align 4, !tbaa !9
  %48 = load i32, ptr %6, align 4, !tbaa !9
  %49 = add nsw i32 %48, %47
  store i32 %49, ptr %6, align 4, !tbaa !9
  br label %50

50:                                               ; preds = %46, %42
  br label %51

51:                                               ; preds = %50
  %52 = load i32, ptr %5, align 4, !tbaa !9
  %53 = add nsw i32 %52, 1
  store i32 %53, ptr %5, align 4, !tbaa !9
  br label %10, !llvm.loop !13

54:                                               ; preds = %15
  ret void
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z4swapIiEvRT_S1_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #2 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #3 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; Optimized IR (opt -passes='default<O3>'):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z5RaderPii(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = ashr i32 %1, 1
  %4 = icmp sgt i32 %1, 2
  br i1 %4, label %.lr.ph28.preheader, label %._crit_edge29

.lr.ph28.preheader:                               ; preds = %2
  %5 = add nsw i32 %1, -1
  %wide.trip.count = zext nneg i32 %5 to i64
  br label %.lr.ph28

._crit_edge29:                                    ; preds = %._crit_edge, %2
  ret void

.lr.ph28:                                         ; preds = %.lr.ph28.preheader, %._crit_edge
  %indvars.iv = phi i64 [ 1, %.lr.ph28.preheader ], [ %indvars.iv.next, %._crit_edge ]
  %.01926 = phi i32 [ %3, %.lr.ph28.preheader ], [ %14, %._crit_edge ]
  %6 = sext i32 %.01926 to i64
  %7 = icmp slt i64 %indvars.iv, %6
  br i1 %7, label %8, label %11

8:                                                ; preds = %.lr.ph28
  %9 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %10 = getelementptr inbounds i32, ptr %0, i64 %6
  tail call void @_Z4swapIiEvRT_S1_(ptr noundef nonnull align 4 dereferenceable(4) %9, ptr noundef nonnull align 4 dereferenceable(4) %10)
  br label %11

11:                                               ; preds = %8, %.lr.ph28
  %.not21 = icmp slt i32 %.01926, %3
  br i1 %.not21, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %11, %.lr.ph
  %.023 = phi i32 [ %13, %.lr.ph ], [ %3, %11 ]
  %.122 = phi i32 [ %12, %.lr.ph ], [ %.01926, %11 ]
  %12 = sub nsw i32 %.122, %.023
  %13 = lshr i32 %.023, 1
  %.not = icmp slt i32 %12, %13
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !5

._crit_edge:                                      ; preds = %.lr.ph, %11
  %.1.lcssa = phi i32 [ %.01926, %11 ], [ %12, %.lr.ph ]
  %.0.lcssa = phi i32 [ %3, %11 ], [ %13, %.lr.ph ]
  %14 = add nsw i32 %.0.lcssa, %.1.lcssa
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge29, label %.lr.ph28, !llvm.loop !7
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z4swapIiEvRT_S1_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #0

attributes #0 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}
!7 = distinct !{!7, !6}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass