; LLVM IR from eyangch/competitive-programming :: USACOcontests/silver/2016.02/cbarn.ll (Z3dfsiRA1000_iS0_i)

; 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
declare dso_local noundef i32 @_Z4srchiPii(i32 noundef, ptr noundef, i32 noundef) #0

; 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

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3dfsiRA1000_iS0_i(i32 noundef %0, ptr noundef nonnull align 4 dereferenceable(4000) %1, ptr noundef nonnull align 4 dereferenceable(4000) %2, i32 noundef %3) #2 {
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  store i32 %0, ptr %5, align 4, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !9
  store ptr %2, ptr %7, align 8, !tbaa !9
  store i32 %3, ptr %8, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  %11 = load i32, ptr %5, align 4, !tbaa !5
  %12 = load ptr, ptr %7, align 8, !tbaa !9
  %13 = getelementptr inbounds [1000 x i32], ptr %12, i64 0, i64 0
  %14 = load i32, ptr %8, align 4, !tbaa !5
  %15 = call noundef i32 @_Z4srchiPii(i32 noundef %11, ptr noundef %13, i32 noundef %14)
  store i32 %15, ptr %9, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  %16 = load i32, ptr %8, align 4, !tbaa !5
  %17 = add nsw i32 %16, 1
  store i32 %17, ptr %10, align 4, !tbaa !5
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = load i32, ptr %10, align 4, !tbaa !5
  %20 = srem i32 %19, %18
  store i32 %20, ptr %10, align 4, !tbaa !5
  br label %21

21:                                               ; preds = %28, %4
  %22 = load ptr, ptr %6, align 8, !tbaa !9
  %23 = load i32, ptr %10, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [1000 x i32], ptr %22, i64 0, i64 %24
  %26 = load i32, ptr %25, align 4, !tbaa !5
  %27 = icmp ne i32 %26, 0
  br i1 %27, label %28, label %33

28:                                               ; preds = %21
  %29 = load i32, ptr %5, align 4, !tbaa !5
  %30 = load ptr, ptr %6, align 8, !tbaa !9
  %31 = load ptr, ptr %7, align 8, !tbaa !9
  %32 = load i32, ptr %10, align 4, !tbaa !5
  call void @_Z3dfsiRA1000_iS0_i(i32 noundef %29, ptr noundef nonnull align 4 dereferenceable(4000) %30, ptr noundef nonnull align 4 dereferenceable(4000) %31, i32 noundef %32)
  br label %21, !llvm.loop !11

33:                                               ; preds = %21
  %34 = load ptr, ptr %6, align 8, !tbaa !9
  %35 = load i32, ptr %8, align 4, !tbaa !5
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds [1000 x i32], ptr %34, i64 0, i64 %36
  %38 = load i32, ptr %37, align 4, !tbaa !5
  %39 = add nsw i32 %38, -1
  store i32 %39, ptr %37, align 4, !tbaa !5
  %40 = load ptr, ptr %6, align 8, !tbaa !9
  %41 = load i32, ptr %10, align 4, !tbaa !5
  %42 = sext i32 %41 to i64
  %43 = getelementptr inbounds [1000 x i32], ptr %40, i64 0, i64 %42
  %44 = load i32, ptr %43, align 4, !tbaa !5
  %45 = add nsw i32 %44, 1
  store i32 %45, ptr %43, align 4, !tbaa !5
  %46 = load i32, ptr %10, align 4, !tbaa !5
  %47 = load ptr, ptr %7, align 8, !tbaa !9
  %48 = load i32, ptr %9, align 4, !tbaa !5
  %49 = sext i32 %48 to i64
  %50 = getelementptr inbounds [1000 x i32], ptr %47, i64 0, i64 %49
  store i32 %46, ptr %50, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  ret void
}

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 = { mustprogress 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 #3 = { 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++ 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"

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z4srchiPii(i32 noundef, ptr noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z3dfsiRA1000_iS0_i(i32 noundef %0, ptr nocapture noundef nonnull align 4 dereferenceable(4000) %1, ptr noundef nonnull align 4 dereferenceable(4000) %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = tail call noundef i32 @_Z4srchiPii(i32 noundef %0, ptr noundef nonnull %2, i32 noundef %3)
  %6 = add nsw i32 %3, 1
  %7 = srem i32 %6, %0
  %8 = sext i32 %7 to i64
  %9 = getelementptr inbounds [1000 x i32], ptr %1, i64 0, i64 %8
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %.not19 = icmp eq i32 %10, 0
  br i1 %.not19, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %4, %.lr.ph
  tail call void @_Z3dfsiRA1000_iS0_i(i32 noundef %0, ptr noundef nonnull align 4 dereferenceable(4000) %1, ptr noundef nonnull align 4 dereferenceable(4000) %2, i32 noundef %7)
  %11 = load i32, ptr %9, align 4, !tbaa !5
  %.not = icmp eq i32 %11, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %4
  %12 = sext i32 %3 to i64
  %13 = getelementptr inbounds [1000 x i32], ptr %1, i64 0, i64 %12
  %14 = load i32, ptr %13, align 4, !tbaa !5
  %15 = add nsw i32 %14, -1
  store i32 %15, ptr %13, align 4, !tbaa !5
  %16 = load i32, ptr %9, align 4, !tbaa !5
  %17 = add nsw i32 %16, 1
  store i32 %17, ptr %9, align 4, !tbaa !5
  %18 = sext i32 %5 to i64
  %19 = getelementptr inbounds [1000 x i32], ptr %2, i64 0, i64 %18
  store i32 %7, ptr %19, align 4, !tbaa !5
  ret void
}

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" }

!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: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass