; LLVM IR from VastoLorde95/Competitive-Programming :: Hackerrank/Codeagon 2016/Problem A (A)

; 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"

@n = external dso_local global i32, align 4
@m = external dso_local global i32, align 4
@cnt = external dso_local global i32, align 4
@tot = external dso_local global i32, align 4
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  %5 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n)
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @m)
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 0, ptr %3, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %33, %0
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = load i32, ptr @n, align 4, !tbaa !5
  %10 = icmp slt i32 %8, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %7
  store i32 2, ptr %4, align 4
  br label %36

12:                                               ; preds = %7
  %13 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %2)
  %14 = load i32, ptr %2, align 4, !tbaa !5
  %15 = load i32, ptr @m, align 4, !tbaa !5
  %16 = icmp sle i32 %14, %15
  br i1 %16, label %17, label %20

17:                                               ; preds = %12
  %18 = load i32, ptr @tot, align 4, !tbaa !5
  %19 = add nsw i32 %18, 1
  store i32 %19, ptr @tot, align 4, !tbaa !5
  br label %33

20:                                               ; preds = %12
  %21 = load i32, ptr @cnt, align 4, !tbaa !5
  %22 = icmp sgt i32 %21, 0
  br i1 %22, label %23, label %28

23:                                               ; preds = %20
  %24 = load i32, ptr @cnt, align 4, !tbaa !5
  %25 = add nsw i32 %24, -1
  store i32 %25, ptr @cnt, align 4, !tbaa !5
  %26 = load i32, ptr @tot, align 4, !tbaa !5
  %27 = add nsw i32 %26, 1
  store i32 %27, ptr @tot, align 4, !tbaa !5
  br label %31

28:                                               ; preds = %20
  %29 = load i32, ptr @tot, align 4, !tbaa !5
  %30 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %29)
  store i32 0, ptr %1, align 4
  store i32 1, ptr %4, align 4
  br label %36

31:                                               ; preds = %23
  br label %32

32:                                               ; preds = %31
  br label %33

33:                                               ; preds = %32, %17
  %34 = load i32, ptr %3, align 4, !tbaa !5
  %35 = add nsw i32 %34, 1
  store i32 %35, ptr %3, align 4, !tbaa !5
  br label %7, !llvm.loop !9

36:                                               ; preds = %28, %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  %37 = load i32, ptr %4, align 4
  switch i32 %37, label %41 [
    i32 2, label %38
  ]

38:                                               ; preds = %36
  %39 = load i32, ptr @tot, align 4, !tbaa !5
  %40 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %39)
  store i32 0, ptr %1, align 4
  store i32 1, ptr %4, align 4
  br label %41

41:                                               ; preds = %38, %36
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  %42 = load i32, ptr %1, align 4
  ret i32 %42
}

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

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

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

attributes #0 = { mustprogress norecurse 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 = { 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"}


; 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"

@n = external dso_local global i32, align 4
@m = external dso_local global i32, align 4
@cnt = external dso_local local_unnamed_addr global i32, align 4
@tot = external dso_local local_unnamed_addr global i32, align 4
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress nofree norecurse nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca i32, align 4
  %2 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n)
  %3 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @m)
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #3
  %4 = load i32, ptr @n, align 4, !tbaa !5
  %.not78 = icmp sgt i32 %4, 0
  br i1 %.not78, label %.lr.ph, label %..critedge_crit_edge

..critedge_crit_edge:                             ; preds = %0
  %.pre = load i32, ptr @tot, align 4, !tbaa !5
  br label %.critedge

.lr.ph:                                           ; preds = %0, %15
  %.049 = phi i32 [ %16, %15 ], [ 0, %0 ]
  %5 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1)
  %6 = load i32, ptr %1, align 4, !tbaa !5
  %7 = load i32, ptr @m, align 4, !tbaa !5
  %.not = icmp sgt i32 %6, %7
  br i1 %.not, label %8, label %15

8:                                                ; preds = %.lr.ph
  %9 = load i32, ptr @cnt, align 4, !tbaa !5
  %10 = icmp sgt i32 %9, 0
  br i1 %10, label %11, label %13

11:                                               ; preds = %8
  %12 = add nsw i32 %9, -1
  store i32 %12, ptr @cnt, align 4, !tbaa !5
  br label %15

13:                                               ; preds = %8
  %14 = load i32, ptr @tot, align 4, !tbaa !5
  br label %.critedge

15:                                               ; preds = %.lr.ph, %11
  %storemerge.in = load i32, ptr @tot, align 4, !tbaa !5
  %storemerge = add nsw i32 %storemerge.in, 1
  store i32 %storemerge, ptr @tot, align 4, !tbaa !5
  %16 = add nuw nsw i32 %.049, 1
  %17 = load i32, ptr @n, align 4, !tbaa !5
  %.not7 = icmp slt i32 %16, %17
  br i1 %.not7, label %.lr.ph, label %.critedge, !llvm.loop !9

.critedge:                                        ; preds = %15, %..critedge_crit_edge, %13
  %.sink = phi i32 [ %14, %13 ], [ %.pre, %..critedge_crit_edge ], [ %storemerge, %15 ]
  %18 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %.sink)
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #3
  ret i32 0
}

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

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

attributes #0 = { mustprogress nofree norecurse 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 = { 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"}


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