; LLVM IR from tangjz/acm-icpc :: self_training/2015-09-24/G.ll (Z2hhPc)

; 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"

@tot = external dso_local global i32, align 4
@vis = external dso_local global [10 x i8], align 1
@name = external dso_local global [10 x [15 x i8]], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z2hhPc(ptr noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #4
  store i32 0, ptr %4, align 4, !tbaa !9
  br label %6

6:                                                ; preds = %22, %1
  %7 = load i32, ptr %4, align 4, !tbaa !9
  %8 = load i32, ptr @tot, align 4, !tbaa !9
  %9 = icmp slt i32 %7, %8
  br i1 %9, label %11, label %10

10:                                               ; preds = %6
  store i32 2, ptr %5, align 4
  br label %25

11:                                               ; preds = %6
  %12 = load i32, ptr %4, align 4, !tbaa !9
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [10 x [15 x i8]], ptr @name, i64 0, i64 %13
  %15 = getelementptr inbounds [15 x i8], ptr %14, i64 0, i64 0
  %16 = load ptr, ptr %3, align 8, !tbaa !5
  %17 = call i32 @strcmp(ptr noundef %15, ptr noundef %16) #5
  %18 = icmp ne i32 %17, 0
  br i1 %18, label %21, label %19

19:                                               ; preds = %11
  %20 = load i32, ptr %4, align 4, !tbaa !9
  store i32 %20, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %25

21:                                               ; preds = %11
  br label %22

22:                                               ; preds = %21
  %23 = load i32, ptr %4, align 4, !tbaa !9
  %24 = add nsw i32 %23, 1
  store i32 %24, ptr %4, align 4, !tbaa !9
  br label %6, !llvm.loop !11

25:                                               ; preds = %19, %10
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #4
  %26 = load i32, ptr %5, align 4
  switch i32 %26, label %41 [
    i32 2, label %27
    i32 1, label %39
  ]

27:                                               ; preds = %25
  %28 = load i32, ptr @tot, align 4, !tbaa !9
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [10 x i8], ptr @vis, i64 0, i64 %29
  store i8 0, ptr %30, align 1, !tbaa !13
  %31 = load i32, ptr @tot, align 4, !tbaa !9
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds [10 x [15 x i8]], ptr @name, i64 0, i64 %32
  %34 = getelementptr inbounds [15 x i8], ptr %33, i64 0, i64 0
  %35 = load ptr, ptr %3, align 8, !tbaa !5
  %36 = call ptr @strcpy(ptr noundef %34, ptr noundef %35) #4
  %37 = load i32, ptr @tot, align 4, !tbaa !9
  %38 = add nsw i32 %37, 1
  store i32 %38, ptr @tot, align 4, !tbaa !9
  store i32 %37, ptr %2, align 4
  br label %39

39:                                               ; preds = %27, %25
  %40 = load i32, ptr %2, align 4
  ret i32 %40

41:                                               ; preds = %25
  unreachable
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind willreturn memory(read)
declare i32 @strcmp(ptr noundef, ptr noundef) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind
declare ptr @strcpy(ptr noundef, ptr noundef) #3

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 = { nounwind willreturn memory(read) "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 "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 #4 = { nounwind }
attributes #5 = { nounwind willreturn memory(read) }

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

@tot = external dso_local local_unnamed_addr global i32, align 4
@vis = external dso_local local_unnamed_addr global [10 x i8], align 1
@name = external dso_local global [10 x [15 x i8]], align 16

; Function Attrs: mustprogress nofree nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local noundef i32 @_Z2hhPc(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @tot, align 4, !tbaa !5
  %3 = icmp sgt i32 %2, 0
  br i1 %3, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %1
  %wide.trip.count = zext nneg i32 %2 to i64
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %6
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %6 ]
  %4 = getelementptr inbounds [10 x [15 x i8]], ptr @name, i64 0, i64 %indvars.iv
  %5 = tail call i32 @strcmp(ptr noundef nonnull dereferenceable(1) %4, ptr noundef nonnull dereferenceable(1) %0) #3
  %.not = icmp eq i32 %5, 0
  br i1 %.not, label %.loopexit.loopexit, label %6

6:                                                ; preds = %.lr.ph
  %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, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %6, %1
  %7 = sext i32 %2 to i64
  %8 = getelementptr inbounds [10 x i8], ptr @vis, i64 0, i64 %7
  store i8 0, ptr %8, align 1, !tbaa !11
  %9 = getelementptr inbounds [10 x [15 x i8]], ptr @name, i64 0, i64 %7
  %10 = tail call ptr @strcpy(ptr noundef nonnull dereferenceable(1) %9, ptr noundef nonnull dereferenceable(1) %0) #4
  %11 = add nsw i32 %2, 1
  store i32 %11, ptr @tot, align 4, !tbaa !5
  br label %.loopexit

.loopexit.loopexit:                               ; preds = %.lr.ph
  %12 = trunc nuw nsw i64 %indvars.iv to i32
  br label %.loopexit

.loopexit:                                        ; preds = %.loopexit.loopexit, %._crit_edge
  %.1 = phi i32 [ %2, %._crit_edge ], [ %12, %.loopexit.loopexit ]
  ret i32 %.1
}

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: read)
declare i32 @strcmp(ptr nocapture noundef, ptr nocapture noundef) local_unnamed_addr #1

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: readwrite)
declare ptr @strcpy(ptr noalias noundef returned writeonly, ptr noalias nocapture noundef readonly) local_unnamed_addr #2

attributes #0 = { mustprogress nofree nounwind memory(readwrite, 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" }
attributes #1 = { mustprogress nofree nounwind willreturn memory(argmem: read) "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 nofree nounwind willreturn memory(argmem: readwrite) "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 willreturn memory(read) }
attributes #4 = { 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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!12, !12, i64 0}
!12 = !{!"bool", !7, i64 0}


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