; LLVM IR from sbshah97/DS-Algo-Handbook :: Algorithms/Graph_Algorithms/Kruskal's_MST (KRUSKAL)

; 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
define dso_local i64 @findroot(ptr noundef %0, i64 noundef %1) #0 {
  %3 = alloca i64, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i64 %1, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %8 = load ptr, ptr %4, align 8, !tbaa !5
  %9 = load i64, ptr %5, align 8, !tbaa !9
  %10 = getelementptr inbounds i64, ptr %8, i64 %9
  %11 = load i64, ptr %10, align 8, !tbaa !9
  %12 = icmp slt i64 %11, 0
  br i1 %12, label %13, label %15

13:                                               ; preds = %2
  %14 = load i64, ptr %5, align 8, !tbaa !9
  store i64 %14, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %27

15:                                               ; preds = %2
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  %18 = load i64, ptr %5, align 8, !tbaa !9
  %19 = getelementptr inbounds i64, ptr %17, i64 %18
  %20 = load i64, ptr %19, align 8, !tbaa !9
  %21 = call i64 @findroot(ptr noundef %16, i64 noundef %20)
  store i64 %21, ptr %6, align 8, !tbaa !9
  %22 = load i64, ptr %6, align 8, !tbaa !9
  %23 = load ptr, ptr %4, align 8, !tbaa !5
  %24 = load i64, ptr %5, align 8, !tbaa !9
  %25 = getelementptr inbounds i64, ptr %23, i64 %24
  store i64 %22, ptr %25, align 8, !tbaa !9
  %26 = load i64, ptr %6, align 8, !tbaa !9
  store i64 %26, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %27

27:                                               ; preds = %15, %13
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  %28 = load i64, ptr %3, align 8
  ret i64 %28
}

; 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 = !{!"long long", !7, i64 0}


; 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: nofree nosync nounwind memory(argmem: readwrite) uwtable
define dso_local i64 @findroot(ptr nocapture noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = getelementptr inbounds i64, ptr %0, i64 %1
  %4 = load i64, ptr %3, align 8, !tbaa !5
  %5 = icmp slt i64 %4, 0
  br i1 %5, label %common.ret11, label %6

common.ret11:                                     ; preds = %2, %6
  %common.ret11.op = phi i64 [ %7, %6 ], [ %1, %2 ]
  ret i64 %common.ret11.op

6:                                                ; preds = %2
  %7 = tail call i64 @findroot(ptr noundef nonnull %0, i64 noundef %4)
  store i64 %7, ptr %3, align 8, !tbaa !5
  br label %common.ret11
}

attributes #0 = { nofree nosync nounwind memory(argmem: readwrite) 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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass