; LLVM IR from FOSS-UCSC/FOSSALGO :: algorithms/gr-bfsrh/c (bfs)

; 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"

@.str = external hidden unnamed_addr constant [50 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@size = external dso_local global i32, align 4
@.str.2 = external hidden unnamed_addr constant [31 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca [20 x i32], align 16
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  %8 = call i32 (ptr, ...) @printf(ptr noundef @.str)
  %9 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef @size)
  call void @llvm.lifetime.start.p0(i64 80, ptr %2) #5
  call void @llvm.memset.p0.i64(ptr align 16 %2, i8 0, i64 80, i1 false)
  %10 = load i32, ptr @size, align 4, !tbaa !5
  %11 = zext i32 %10 to i64
  %12 = load i32, ptr @size, align 4, !tbaa !5
  %13 = zext i32 %12 to i64
  %14 = call ptr @llvm.stacksave.p0()
  store ptr %14, ptr %3, align 8
  %15 = mul nuw i64 %11, %13
  %16 = alloca i32, i64 %15, align 16
  store i64 %11, ptr %4, align 8
  store i64 %13, ptr %5, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #5
  %17 = call i32 (ptr, ...) @printf(ptr noundef @.str.2)
  store i32 0, ptr %6, align 4, !tbaa !5
  br label %18

18:                                               ; preds = %40, %0
  %19 = load i32, ptr %6, align 4, !tbaa !5
  %20 = load i32, ptr @size, align 4, !tbaa !5
  %21 = icmp slt i32 %19, %20
  br i1 %21, label %22, label %43

22:                                               ; preds = %18
  store i32 0, ptr %7, align 4, !tbaa !5
  br label %23

23:                                               ; preds = %36, %22
  %24 = load i32, ptr %7, align 4, !tbaa !5
  %25 = load i32, ptr @size, align 4, !tbaa !5
  %26 = icmp slt i32 %24, %25
  br i1 %26, label %27, label %39

27:                                               ; preds = %23
  %28 = load i32, ptr %6, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = mul nsw i64 %29, %13
  %31 = getelementptr inbounds i32, ptr %16, i64 %30
  %32 = load i32, ptr %7, align 4, !tbaa !5
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds i32, ptr %31, i64 %33
  %35 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef %34)
  br label %36

36:                                               ; preds = %27
  %37 = load i32, ptr %7, align 4, !tbaa !5
  %38 = add nsw i32 %37, 1
  store i32 %38, ptr %7, align 4, !tbaa !5
  br label %23, !llvm.loop !9

39:                                               ; preds = %23
  br label %40

40:                                               ; preds = %39
  %41 = load i32, ptr %6, align 4, !tbaa !5
  %42 = add nsw i32 %41, 1
  store i32 %42, ptr %6, align 4, !tbaa !5
  br label %18, !llvm.loop !11

43:                                               ; preds = %18
  %44 = getelementptr inbounds [20 x i32], ptr %2, i64 0, i64 0
  call void @breadth_first_search(ptr noundef %16, ptr noundef %44, i32 noundef 0)
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #5
  %45 = load ptr, ptr %3, align 8
  call void @llvm.stackrestore.p0(ptr %45)
  call void @llvm.lifetime.end.p0(i64 80, ptr %2) #5
  %46 = load i32, ptr %1, align 4
  ret i32 %46
}

declare i32 @printf(ptr noundef, ...) #1

declare i32 @__isoc99_scanf(ptr noundef, ...) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #3

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #4

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

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare void @llvm.stackrestore.p0(ptr) #4

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 = { "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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #4 = { nocallback nofree nosync nounwind willreturn }
attributes #5 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


; 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"

@.str = external hidden unnamed_addr constant [50 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@size = external dso_local global i32, align 4
@.str.2 = external hidden unnamed_addr constant [31 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca [20 x i32], align 16
  %2 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str)
  %3 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull @size)
  call void @llvm.lifetime.start.p0(i64 80, ptr nonnull %1) #5
  call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(80) %1, i8 0, i64 80, i1 false)
  %4 = load i32, ptr @size, align 4, !tbaa !5
  %5 = zext i32 %4 to i64
  %6 = tail call ptr @llvm.stacksave.p0()
  %7 = mul nuw i64 %5, %5
  %8 = alloca i32, i64 %7, align 16
  %9 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2)
  %10 = load i32, ptr @size, align 4, !tbaa !5
  %11 = icmp sgt i32 %10, 0
  br i1 %11, label %.preheader, label %._crit_edge10

.preheader:                                       ; preds = %0, %._crit_edge
  %12 = phi i32 [ %22, %._crit_edge ], [ %10, %0 ]
  %indvars.iv13 = phi i64 [ %indvars.iv.next14, %._crit_edge ], [ 0, %0 ]
  %13 = icmp sgt i32 %12, 0
  br i1 %13, label %.lr.ph, label %.preheader.._crit_edge_crit_edge

.preheader.._crit_edge_crit_edge:                 ; preds = %.preheader
  %.pre = sext i32 %12 to i64
  br label %._crit_edge

.lr.ph:                                           ; preds = %.preheader
  %14 = mul nuw nsw i64 %indvars.iv13, %5
  %15 = getelementptr inbounds i32, ptr %8, i64 %14
  br label %16

16:                                               ; preds = %.lr.ph, %16
  %indvars.iv = phi i64 [ 0, %.lr.ph ], [ %indvars.iv.next, %16 ]
  %17 = getelementptr inbounds i32, ptr %15, i64 %indvars.iv
  %18 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull %17)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %19 = load i32, ptr @size, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = icmp slt i64 %indvars.iv.next, %20
  br i1 %21, label %16, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %16, %.preheader.._crit_edge_crit_edge
  %.pre-phi = phi i64 [ %.pre, %.preheader.._crit_edge_crit_edge ], [ %20, %16 ]
  %22 = phi i32 [ %12, %.preheader.._crit_edge_crit_edge ], [ %19, %16 ]
  %indvars.iv.next14 = add nuw nsw i64 %indvars.iv13, 1
  %23 = icmp slt i64 %indvars.iv.next14, %.pre-phi
  br i1 %23, label %.preheader, label %._crit_edge10, !llvm.loop !11

._crit_edge10:                                    ; preds = %._crit_edge, %0
  call void @breadth_first_search(ptr noundef nonnull %8, ptr noundef nonnull %1, i32 noundef 0)
  call void @llvm.stackrestore.p0(ptr %6)
  call void @llvm.lifetime.end.p0(i64 80, ptr nonnull %1) #5
  ret i32 0
}

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

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #3

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #4

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

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn
declare void @llvm.stackrestore.p0(ptr) #4

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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #4 = { mustprogress nocallback nofree nosync nounwind willreturn }
attributes #5 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10, !12}
!12 = !{!"llvm.loop.unswitch.partial.disable"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyCFGPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SCCPPass,SROAPass,SimpleLoopUnswitchPass,SimplifyCFGPass,TailCallElimPass