; LLVM IR from Tunghohin/Competitive_Coding :: Codeforces/cf1561_A.ll (Z5checkPii)

; 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: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z5checkPii(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca i1, align 1
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %8

8:                                                ; preds = %29, %2
  %9 = load i32, ptr %6, align 4, !tbaa !9
  %10 = load i32, ptr %5, align 4, !tbaa !9
  %11 = sub nsw i32 %10, 1
  %12 = icmp slt i32 %9, %11
  br i1 %12, label %14, label %13

13:                                               ; preds = %8
  store i32 2, ptr %7, align 4
  br label %32

14:                                               ; preds = %8
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = load i32, ptr %6, align 4, !tbaa !9
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds i32, ptr %15, i64 %17
  %19 = load i32, ptr %18, align 4, !tbaa !9
  %20 = load ptr, ptr %4, align 8, !tbaa !5
  %21 = load i32, ptr %6, align 4, !tbaa !9
  %22 = add nsw i32 %21, 1
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds i32, ptr %20, i64 %23
  %25 = load i32, ptr %24, align 4, !tbaa !9
  %26 = icmp sgt i32 %19, %25
  br i1 %26, label %27, label %28

27:                                               ; preds = %14
  store i1 true, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %32

28:                                               ; preds = %14
  br label %29

29:                                               ; preds = %28
  %30 = load i32, ptr %6, align 4, !tbaa !9
  %31 = add nsw i32 %30, 1
  store i32 %31, ptr %6, align 4, !tbaa !9
  br label %8, !llvm.loop !11

32:                                               ; preds = %27, %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %33 = load i32, ptr %7, align 4
  switch i32 %33, label %37 [
    i32 2, label %34
    i32 1, label %35
  ]

34:                                               ; preds = %32
  store i1 false, ptr %3, align 1
  br label %35

35:                                               ; preds = %34, %32
  %36 = load i1, ptr %3, align 1
  ret i1 %36

37:                                               ; preds = %32
  unreachable
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

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" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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"}


; 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 nofree norecurse nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef zeroext i1 @_Z5checkPii(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = add nsw i32 %1, -1
  %smax = tail call i32 @llvm.smax.i32(i32 %3, i32 0)
  %wide.trip.count = zext nneg i32 %smax to i64
  br label %4

4:                                                ; preds = %5, %2
  %indvars.iv = phi i64 [ %indvars.iv.next, %5 ], [ 0, %2 ]
  %exitcond.not = icmp eq i64 %indvars.iv, %wide.trip.count
  br i1 %exitcond.not, label %11, label %5

5:                                                ; preds = %4
  %6 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %8 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = icmp sgt i32 %7, %9
  br i1 %10, label %11, label %4, !llvm.loop !9

11:                                               ; preds = %5, %4
  %12 = sext i32 %3 to i64
  %.not = icmp slt i64 %indvars.iv, %12
  ret i1 %.not
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smax.i32(i32, i32) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) 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 #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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