; LLVM IR from begeekmyfriend/leetcode :: 0200_number_of_islands (islands)

; 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"

@stderr = external global ptr, align 8
@.str = external hidden unnamed_addr constant [39 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local i32 @main(i32 noundef %0, ptr noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca ptr, align 8
  store i32 0, ptr %3, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !9
  %11 = load i32, ptr %4, align 4, !tbaa !5
  %12 = icmp slt i32 %11, 2
  br i1 %12, label %13, label %16

13:                                               ; preds = %2
  %14 = load ptr, ptr @stderr, align 8, !tbaa !9
  %15 = call i32 (ptr, ptr, ...) @fprintf(ptr noundef %14, ptr noundef @.str) #8
  call void @exit(i32 noundef -1) #9
  unreachable

16:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #8
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #8
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #8
  %17 = load i32, ptr %4, align 4, !tbaa !5
  %18 = sub nsw i32 %17, 1
  store i32 %18, ptr %8, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #8
  %19 = load ptr, ptr %5, align 8, !tbaa !9
  %20 = getelementptr inbounds ptr, ptr %19, i64 1
  %21 = load ptr, ptr %20, align 8, !tbaa !9
  %22 = call i64 @strlen(ptr noundef %21) #10
  %23 = trunc i64 %22 to i32
  store i32 %23, ptr %9, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #8
  %24 = load i32, ptr %8, align 4, !tbaa !5
  %25 = sext i32 %24 to i64
  %26 = mul i64 %25, 8
  %27 = call noalias ptr @malloc(i64 noundef %26) #11
  store ptr %27, ptr %10, align 8, !tbaa !9
  store i32 0, ptr %6, align 4, !tbaa !5
  br label %28

28:                                               ; preds = %53, %16
  %29 = load i32, ptr %6, align 4, !tbaa !5
  %30 = load i32, ptr %8, align 4, !tbaa !5
  %31 = icmp slt i32 %29, %30
  br i1 %31, label %32, label %56

32:                                               ; preds = %28
  %33 = load i32, ptr %9, align 4, !tbaa !5
  %34 = sext i32 %33 to i64
  %35 = call noalias ptr @malloc(i64 noundef %34) #11
  %36 = load ptr, ptr %10, align 8, !tbaa !9
  %37 = load i32, ptr %6, align 4, !tbaa !5
  %38 = sext i32 %37 to i64
  %39 = getelementptr inbounds ptr, ptr %36, i64 %38
  store ptr %35, ptr %39, align 8, !tbaa !9
  %40 = load ptr, ptr %10, align 8, !tbaa !9
  %41 = load i32, ptr %6, align 4, !tbaa !5
  %42 = sext i32 %41 to i64
  %43 = getelementptr inbounds ptr, ptr %40, i64 %42
  %44 = load ptr, ptr %43, align 8, !tbaa !9
  %45 = load ptr, ptr %5, align 8, !tbaa !9
  %46 = load i32, ptr %6, align 4, !tbaa !5
  %47 = add nsw i32 %46, 1
  %48 = sext i32 %47 to i64
  %49 = getelementptr inbounds ptr, ptr %45, i64 %48
  %50 = load ptr, ptr %49, align 8, !tbaa !9
  %51 = load i32, ptr %9, align 4, !tbaa !5
  %52 = sext i32 %51 to i64
  call void @llvm.memcpy.p0.p0.i64(ptr align 1 %44, ptr align 1 %50, i64 %52, i1 false)
  br label %53

53:                                               ; preds = %32
  %54 = load i32, ptr %6, align 4, !tbaa !5
  %55 = add nsw i32 %54, 1
  store i32 %55, ptr %6, align 4, !tbaa !5
  br label %28, !llvm.loop !11

56:                                               ; preds = %28
  %57 = load ptr, ptr %10, align 8, !tbaa !9
  %58 = load i32, ptr %8, align 4, !tbaa !5
  %59 = load i32, ptr %9, align 4, !tbaa !5
  %60 = call i32 @numIslands(ptr noundef %57, i32 noundef %58, i32 noundef %59)
  %61 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %60)
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #8
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #8
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #8
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #8
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #8
  ret i32 0
}

; Function Attrs: nounwind
declare i32 @fprintf(ptr noundef, ptr noundef, ...) #1

; Function Attrs: noreturn nounwind
declare void @exit(i32 noundef) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #3

; Function Attrs: nounwind willreturn memory(read)
declare i64 @strlen(ptr noundef) #4

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #5

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #6

declare i32 @printf(ptr noundef, ...) #7

; Function Attrs: nounwind uwtable
declare hidden i32 @numIslands(ptr noundef, i32 noundef, i32 noundef) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #3

attributes #0 = { 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 = { nounwind "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 = { noreturn nounwind "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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { nounwind willreturn memory(read) "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 #5 = { nounwind allocsize(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 #6 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #7 = { "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 #8 = { nounwind }
attributes #9 = { noreturn nounwind }
attributes #10 = { nounwind willreturn memory(read) }
attributes #11 = { nounwind allocsize(0) }

!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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !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"

@stderr = external local_unnamed_addr global ptr, align 8
@.str = external hidden unnamed_addr constant [39 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @main(i32 noundef %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 {
  %3 = icmp slt i32 %0, 2
  br i1 %3, label %4, label %.lr.ph

4:                                                ; preds = %2
  %5 = load ptr, ptr @stderr, align 8, !tbaa !5
  %6 = tail call i32 (ptr, ptr, ...) @fprintf(ptr noundef %5, ptr noundef nonnull @.str) #6
  tail call void @exit(i32 noundef -1) #7
  unreachable

.lr.ph:                                           ; preds = %2
  %7 = add nsw i32 %0, -1
  %8 = getelementptr inbounds i8, ptr %1, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %10 = tail call i64 @strlen(ptr noundef nonnull dereferenceable(1) %9) #8
  %11 = zext nneg i32 %7 to i64
  %12 = shl nuw nsw i64 %11, 3
  %13 = tail call noalias ptr @malloc(i64 noundef %12) #9
  %sext = shl i64 %10, 32
  %14 = ashr exact i64 %sext, 32
  br label %15

15:                                               ; preds = %.lr.ph, %15
  %indvars.iv = phi i64 [ 0, %.lr.ph ], [ %indvars.iv.next, %15 ]
  %16 = tail call noalias ptr @malloc(i64 noundef %14) #9
  %17 = getelementptr inbounds ptr, ptr %13, i64 %indvars.iv
  store ptr %16, ptr %17, align 8, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %18 = getelementptr inbounds ptr, ptr %1, i64 %indvars.iv.next
  %19 = load ptr, ptr %18, align 8, !tbaa !5
  tail call void @llvm.memcpy.p0.p0.i64(ptr align 1 %16, ptr align 1 %19, i64 %14, i1 false)
  %exitcond.not = icmp eq i64 %indvars.iv.next, %11
  br i1 %exitcond.not, label %._crit_edge, label %15, !llvm.loop !9

._crit_edge:                                      ; preds = %15
  %20 = trunc i64 %10 to i32
  %21 = tail call i32 @numIslands(ptr noundef nonnull %13, i32 noundef %7, i32 noundef %20)
  %22 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %21)
  ret i32 0
}

; Function Attrs: nofree nounwind
declare noundef i32 @fprintf(ptr nocapture noundef, ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: noreturn nounwind
declare void @exit(i32 noundef) local_unnamed_addr #2

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: read)
declare i64 @strlen(ptr nocapture noundef) local_unnamed_addr #3

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #4

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #5

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
declare hidden i32 @numIslands(ptr noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

attributes #0 = { 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 = { nofree nounwind "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 = { noreturn nounwind "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 = { mustprogress nofree nounwind willreturn memory(argmem: read) "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 #4 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 #5 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #6 = { cold nounwind }
attributes #7 = { noreturn nounwind }
attributes #8 = { nounwind willreturn memory(read) }
attributes #9 = { nounwind allocsize(0) }

!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/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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