; LLVM IR from upupming/algorithm :: AdvancedLevel_C++/1013. Battle Over Cities (25) .ll (Z3dfsi)

; 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"

@v = external dso_local global [1010 x [1010 x i32]], align 16
@visit = external dso_local global [1010 x i8], align 16
@n = external dso_local global i32, align 4

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3dfsi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  %4 = load i32, ptr %2, align 4, !tbaa !5
  %5 = sext i32 %4 to i64
  %6 = getelementptr inbounds [1010 x i8], ptr @visit, i64 0, i64 %5
  store i8 1, ptr %6, align 1, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 1, ptr %3, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %32, %1
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = load i32, ptr @n, align 4, !tbaa !5
  %10 = icmp sle i32 %8, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  br label %35

12:                                               ; preds = %7
  %13 = load i32, ptr %3, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [1010 x i8], ptr @visit, i64 0, i64 %14
  %16 = load i8, ptr %15, align 1, !tbaa !9, !range !11, !noundef !12
  %17 = trunc i8 %16 to i1
  %18 = zext i1 %17 to i32
  %19 = icmp eq i32 %18, 0
  br i1 %19, label %20, label %31

20:                                               ; preds = %12
  %21 = load i32, ptr %2, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [1010 x [1010 x i32]], ptr @v, i64 0, i64 %22
  %24 = load i32, ptr %3, align 4, !tbaa !5
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds [1010 x i32], ptr %23, i64 0, i64 %25
  %27 = load i32, ptr %26, align 4, !tbaa !5
  %28 = icmp eq i32 %27, 1
  br i1 %28, label %29, label %31

29:                                               ; preds = %20
  %30 = load i32, ptr %3, align 4, !tbaa !5
  call void @_Z3dfsi(i32 noundef %30)
  br label %31

31:                                               ; preds = %29, %20, %12
  br label %32

32:                                               ; preds = %31
  %33 = load i32, ptr %3, align 4, !tbaa !5
  %34 = add nsw i32 %33, 1
  store i32 %34, ptr %3, align 4, !tbaa !5
  br label %7, !llvm.loop !13

35:                                               ; preds = %11
  ret void
}

; 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 = { 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 #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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"bool", !7, i64 0}
!11 = !{i8 0, i8 2}
!12 = !{}
!13 = distinct !{!13, !14}
!14 = !{!"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"

@v = external dso_local local_unnamed_addr global [1010 x [1010 x i32]], align 16
@visit = external dso_local local_unnamed_addr global [1010 x i8], align 16
@n = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nofree nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z3dfsi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = sext i32 %0 to i64
  %3 = getelementptr inbounds [1010 x i8], ptr @visit, i64 0, i64 %2
  store i8 1, ptr %3, align 1, !tbaa !5
  %4 = load i32, ptr @n, align 4, !tbaa !9
  %.not7 = icmp slt i32 %4, 1
  br i1 %.not7, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %15, %1
  ret void

.lr.ph:                                           ; preds = %1, %15
  %5 = phi i32 [ %16, %15 ], [ %4, %1 ]
  %indvars.iv = phi i64 [ %indvars.iv.next, %15 ], [ 1, %1 ]
  %6 = getelementptr inbounds [1010 x i8], ptr @visit, i64 0, i64 %indvars.iv
  %7 = load i8, ptr %6, align 1, !tbaa !5, !range !11, !noundef !12
  %8 = icmp eq i8 %7, 0
  br i1 %8, label %9, label %15

9:                                                ; preds = %.lr.ph
  %10 = getelementptr inbounds [1010 x [1010 x i32]], ptr @v, i64 0, i64 %2, i64 %indvars.iv
  %11 = load i32, ptr %10, align 4, !tbaa !9
  %12 = icmp eq i32 %11, 1
  br i1 %12, label %13, label %15

13:                                               ; preds = %9
  %14 = trunc nuw nsw i64 %indvars.iv to i32
  tail call void @_Z3dfsi(i32 noundef %14)
  %.pre = load i32, ptr @n, align 4, !tbaa !9
  br label %15

15:                                               ; preds = %.lr.ph, %9, %13
  %16 = phi i32 [ %5, %.lr.ph ], [ %5, %9 ], [ %.pre, %13 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %17 = sext i32 %16 to i64
  %.not.not = icmp slt i64 %indvars.iv, %17
  br i1 %.not.not, label %.lr.ph, label %._crit_edge, !llvm.loop !13
}

attributes #0 = { mustprogress nofree nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) 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 = !{!"bool", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{i8 0, i8 2}
!12 = !{}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


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