; LLVM IR from kenjin/Awesome-LC-C-Cracker :: leetcode-c-sol/0200_NumberOfIslands (0200_NumberOfIslands)

; 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: nounwind uwtable
declare dso_local void @findNeighborDfs(ptr noundef, i32 noundef, i32 noundef, i32 noundef, i32 noundef) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @numIslands(ptr noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store i32 %2, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  store i32 0, ptr %8, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %45, %3
  %12 = load i32, ptr %8, align 4, !tbaa !9
  %13 = load i32, ptr %5, align 4, !tbaa !9
  %14 = icmp slt i32 %12, %13
  br i1 %14, label %16, label %15

15:                                               ; preds = %11
  store i32 2, ptr %9, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  br label %48

16:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  store i32 0, ptr %10, align 4, !tbaa !9
  br label %17

17:                                               ; preds = %41, %16
  %18 = load i32, ptr %10, align 4, !tbaa !9
  %19 = load i32, ptr %6, align 4, !tbaa !9
  %20 = icmp slt i32 %18, %19
  br i1 %20, label %22, label %21

21:                                               ; preds = %17
  store i32 5, ptr %9, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  br label %44

22:                                               ; preds = %17
  %23 = load ptr, ptr %4, align 8, !tbaa !5
  %24 = load i32, ptr %8, align 4, !tbaa !9
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds ptr, ptr %23, i64 %25
  %27 = load ptr, ptr %26, align 8, !tbaa !5
  %28 = load i32, ptr %10, align 4, !tbaa !9
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds i8, ptr %27, i64 %29
  %31 = load i8, ptr %30, align 1, !tbaa !11
  %32 = sext i8 %31 to i32
  %33 = sub nsw i32 %32, 48
  %34 = load i32, ptr %7, align 4, !tbaa !9
  %35 = add nsw i32 %34, %33
  store i32 %35, ptr %7, align 4, !tbaa !9
  %36 = load ptr, ptr %4, align 8, !tbaa !5
  %37 = load i32, ptr %8, align 4, !tbaa !9
  %38 = load i32, ptr %10, align 4, !tbaa !9
  %39 = load i32, ptr %5, align 4, !tbaa !9
  %40 = load i32, ptr %6, align 4, !tbaa !9
  call void @findNeighborDfs(ptr noundef %36, i32 noundef %37, i32 noundef %38, i32 noundef %39, i32 noundef %40)
  br label %41

41:                                               ; preds = %22
  %42 = load i32, ptr %10, align 4, !tbaa !9
  %43 = add nsw i32 %42, 1
  store i32 %43, ptr %10, align 4, !tbaa !9
  br label %17, !llvm.loop !12

44:                                               ; preds = %21
  br label %45

45:                                               ; preds = %44
  %46 = load i32, ptr %8, align 4, !tbaa !9
  %47 = add nsw i32 %46, 1
  store i32 %47, ptr %8, align 4, !tbaa !9
  br label %11, !llvm.loop !14

48:                                               ; preds = %15
  %49 = load i32, ptr %7, align 4, !tbaa !9
  store i32 1, ptr %9, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret i32 %49
}

; 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 = { 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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = distinct !{!14, !13}


; 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: nounwind uwtable
declare dso_local void @findNeighborDfs(ptr noundef, i32 noundef, i32 noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local i32 @numIslands(ptr noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp sgt i32 %1, 0
  %5 = icmp sgt i32 %2, 0
  %or.cond = and i1 %4, %5
  br i1 %or.cond, label %.preheader.us.preheader, label %._crit_edge23

.preheader.us.preheader:                          ; preds = %3
  %wide.trip.count30 = zext nneg i32 %1 to i64
  %wide.trip.count = zext nneg i32 %2 to i64
  br label %.preheader.us

.preheader.us:                                    ; preds = %.preheader.us.preheader, %._crit_edge.us
  %indvars.iv27 = phi i64 [ 0, %.preheader.us.preheader ], [ %indvars.iv.next28, %._crit_edge.us ]
  %.01621.us = phi i32 [ 0, %.preheader.us.preheader ], [ %14, %._crit_edge.us ]
  %6 = getelementptr inbounds ptr, ptr %0, i64 %indvars.iv27
  %7 = trunc nuw nsw i64 %indvars.iv27 to i32
  br label %8

8:                                                ; preds = %.preheader.us, %8
  %indvars.iv = phi i64 [ 0, %.preheader.us ], [ %indvars.iv.next, %8 ]
  %.119.us = phi i32 [ %.01621.us, %.preheader.us ], [ %14, %8 ]
  %9 = load ptr, ptr %6, align 8, !tbaa !5
  %10 = getelementptr inbounds i8, ptr %9, i64 %indvars.iv
  %11 = load i8, ptr %10, align 1, !tbaa !9
  %12 = sext i8 %11 to i32
  %13 = add i32 %.119.us, -48
  %14 = add i32 %13, %12
  %15 = trunc nuw nsw i64 %indvars.iv to i32
  tail call void @findNeighborDfs(ptr noundef %0, i32 noundef %7, i32 noundef %15, i32 noundef %1, i32 noundef %2)
  %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_edge.us, label %8, !llvm.loop !10

._crit_edge.us:                                   ; preds = %8
  %indvars.iv.next28 = add nuw nsw i64 %indvars.iv27, 1
  %exitcond31.not = icmp eq i64 %indvars.iv.next28, %wide.trip.count30
  br i1 %exitcond31.not, label %._crit_edge23, label %.preheader.us, !llvm.loop !12

._crit_edge23:                                    ; preds = %._crit_edge.us, %3
  %.016.lcssa = phi i32 [ 0, %3 ], [ %14, %._crit_edge.us ]
  ret i32 %.016.lcssa
}

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" }

!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 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}
!12 = distinct !{!12, !11}


; Effective O3 passes: GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopInstSimplifyPass,LoopRotatePass,LoopSimplifyCFGPass,LoopSimplifyPass,LoopUnrollPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass