; LLVM IR from eyangch/competitive-programming :: USACOcontests/silver/2017.01/cowdance.ll (Z4bAnsiiPi)

; 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 zeroext i1 @_Z5danceiiPii(i32 noundef, 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 noundef i32 @_Z4bAnsiiPi(i32 noundef %0, i32 noundef %1, ptr noundef %2) #2 {
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  store ptr %2, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  store i32 1, ptr %7, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #4
  %11 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %11, ptr %8, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #4
  %12 = load i32, ptr %8, align 4, !tbaa !5
  %13 = load i32, ptr %7, align 4, !tbaa !5
  %14 = add nsw i32 %12, %13
  %15 = sdiv i32 %14, 2
  store i32 %15, ptr %9, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #4
  store i32 100000, ptr %10, align 4, !tbaa !5
  br label %16

16:                                               ; preds = %34, %3
  %17 = load i32, ptr %7, align 4, !tbaa !5
  %18 = load i32, ptr %8, align 4, !tbaa !5
  %19 = icmp sle i32 %17, %18
  br i1 %19, label %20, label %39

20:                                               ; preds = %16
  %21 = load i32, ptr %4, align 4, !tbaa !5
  %22 = load i32, ptr %5, align 4, !tbaa !5
  %23 = load ptr, ptr %6, align 8, !tbaa !9
  %24 = load i32, ptr %9, align 4, !tbaa !5
  %25 = call noundef zeroext i1 @_Z5danceiiPii(i32 noundef %21, i32 noundef %22, ptr noundef %23, i32 noundef %24)
  br i1 %25, label %26, label %31

26:                                               ; preds = %20
  %27 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %10, ptr noundef nonnull align 4 dereferenceable(4) %9)
  %28 = load i32, ptr %27, align 4, !tbaa !5
  store i32 %28, ptr %10, align 4, !tbaa !5
  %29 = load i32, ptr %9, align 4, !tbaa !5
  %30 = sub nsw i32 %29, 1
  store i32 %30, ptr %8, align 4, !tbaa !5
  br label %34

31:                                               ; preds = %20
  %32 = load i32, ptr %9, align 4, !tbaa !5
  %33 = add nsw i32 %32, 1
  store i32 %33, ptr %7, align 4, !tbaa !5
  br label %34

34:                                               ; preds = %31, %26
  %35 = load i32, ptr %8, align 4, !tbaa !5
  %36 = load i32, ptr %7, align 4, !tbaa !5
  %37 = add nsw i32 %35, %36
  %38 = sdiv i32 %37, 2
  store i32 %38, ptr %9, align 4, !tbaa !5
  br label %16, !llvm.loop !11

39:                                               ; preds = %16
  %40 = load i32, ptr %10, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  ret i32 %40
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #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 = { 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 = { inlinehint 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 #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 = !{!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 zeroext i1 @_Z5danceiiPii(i32 noundef, i32 noundef, ptr noundef, i32 noundef) local_unnamed_addr #0

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

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

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z4bAnsiiPi(i32 noundef %0, i32 noundef %1, ptr noundef %2) local_unnamed_addr #0 {
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #3
  %6 = add nsw i32 %0, 1
  %7 = sdiv i32 %6, 2
  store i32 %7, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %5) #3
  store i32 100000, ptr %5, align 4, !tbaa !5
  %.not11 = icmp slt i32 %0, 1
  br i1 %.not11, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %3, %18
  %8 = phi i32 [ %20, %18 ], [ %7, %3 ]
  %.013 = phi i32 [ %.1, %18 ], [ %0, %3 ]
  %.0912 = phi i32 [ %.110, %18 ], [ 1, %3 ]
  %9 = call noundef zeroext i1 @_Z5danceiiPii(i32 noundef %0, i32 noundef %1, ptr noundef %2, i32 noundef %8)
  br i1 %9, label %10, label %15

10:                                               ; preds = %.lr.ph
  %11 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %5, ptr noundef nonnull align 4 dereferenceable(4) %4)
  %12 = load i32, ptr %11, align 4, !tbaa !5
  store i32 %12, ptr %5, align 4, !tbaa !5
  %13 = load i32, ptr %4, align 4, !tbaa !5
  %14 = add nsw i32 %13, -1
  br label %18

15:                                               ; preds = %.lr.ph
  %16 = load i32, ptr %4, align 4, !tbaa !5
  %17 = add nsw i32 %16, 1
  br label %18

18:                                               ; preds = %15, %10
  %.110 = phi i32 [ %.0912, %10 ], [ %17, %15 ]
  %.1 = phi i32 [ %14, %10 ], [ %.013, %15 ]
  %19 = add nsw i32 %.1, %.110
  %20 = sdiv i32 %19, 2
  store i32 %20, ptr %4, align 4, !tbaa !5
  %.not = icmp sgt i32 %.110, %.1
  br i1 %.not, label %._crit_edge.loopexit, label %.lr.ph, !llvm.loop !9

._crit_edge.loopexit:                             ; preds = %18
  %.pre = load i32, ptr %5, align 4, !tbaa !5
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %3
  %21 = phi i32 [ %.pre, %._crit_edge.loopexit ], [ 100000, %3 ]
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %5) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #3
  ret i32 %21
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #2

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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { inlinehint 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 #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: GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass