; LLVM IR from AdarshGaur/Competitive-Programming :: SPOJ/AGGRCOW - Aggressive cows.ll (Z5canbex)

; 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 i64, align 8
@c = external dso_local global i64, align 8
@arr = external dso_local global [1000000 x i64], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z5canbex(i64 noundef %0) #0 {
  %2 = alloca i1, align 1
  %3 = alloca i64, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i64, align 8
  %7 = alloca i32, align 4
  store i64 %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %8 = load i64, ptr @arr, align 16, !tbaa !5
  %9 = trunc i64 %8 to i32
  store i32 %9, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  store i64 0, ptr %6, align 8, !tbaa !5
  br label %10

10:                                               ; preds = %37, %1
  %11 = load i64, ptr %6, align 8, !tbaa !5
  %12 = load i64, ptr @n, align 8, !tbaa !5
  %13 = icmp slt i64 %11, %12
  br i1 %13, label %15, label %14

14:                                               ; preds = %10
  store i32 2, ptr %7, align 4
  br label %40

15:                                               ; preds = %10
  %16 = load i64, ptr %6, align 8, !tbaa !5
  %17 = getelementptr inbounds [1000000 x i64], ptr @arr, i64 0, i64 %16
  %18 = load i64, ptr %17, align 8, !tbaa !5
  %19 = load i32, ptr %5, align 4, !tbaa !9
  %20 = sext i32 %19 to i64
  %21 = sub nsw i64 %18, %20
  %22 = load i64, ptr %3, align 8, !tbaa !5
  %23 = icmp sge i64 %21, %22
  br i1 %23, label %24, label %36

24:                                               ; preds = %15
  %25 = load i32, ptr %4, align 4, !tbaa !9
  %26 = add nsw i32 %25, 1
  store i32 %26, ptr %4, align 4, !tbaa !9
  %27 = sext i32 %26 to i64
  %28 = load i64, ptr @c, align 8, !tbaa !5
  %29 = icmp eq i64 %27, %28
  br i1 %29, label %30, label %31

30:                                               ; preds = %24
  store i1 true, ptr %2, align 1
  store i32 1, ptr %7, align 4
  br label %40

31:                                               ; preds = %24
  %32 = load i64, ptr %6, align 8, !tbaa !5
  %33 = getelementptr inbounds [1000000 x i64], ptr @arr, i64 0, i64 %32
  %34 = load i64, ptr %33, align 8, !tbaa !5
  %35 = trunc i64 %34 to i32
  store i32 %35, ptr %5, align 4, !tbaa !9
  br label %36

36:                                               ; preds = %31, %15
  br label %37

37:                                               ; preds = %36
  %38 = load i64, ptr %6, align 8, !tbaa !5
  %39 = add nsw i64 %38, 1
  store i64 %39, ptr %6, align 8, !tbaa !5
  br label %10, !llvm.loop !11

40:                                               ; preds = %30, %14
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  %41 = load i32, ptr %7, align 4
  switch i32 %41, label %43 [
    i32 2, label %42
  ]

42:                                               ; preds = %40
  store i1 false, ptr %2, align 1
  store i32 1, ptr %7, align 4
  br label %43

43:                                               ; preds = %42, %40
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %44 = load i1, ptr %2, align 1
  ret i1 %44
}

; 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 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 }

!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 = !{!"long long", !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"}


; 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 local_unnamed_addr global i64, align 8
@c = external dso_local local_unnamed_addr global i64, align 8
@arr = external dso_local local_unnamed_addr global [1000000 x i64], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef zeroext i1 @_Z5canbex(i64 noundef %0) local_unnamed_addr #0 {
  %2 = load i64, ptr @n, align 8, !tbaa !5
  %.not1415 = icmp sgt i64 %2, 0
  br i1 %.not1415, label %.lr.ph, label %.critedge

.lr.ph:                                           ; preds = %1
  %3 = load i64, ptr @arr, align 16, !tbaa !5
  %4 = trunc i64 %3 to i32
  %5 = load i64, ptr @c, align 8
  br label %6

6:                                                ; preds = %.lr.ph, %17
  %.not1419 = phi i1 [ true, %.lr.ph ], [ %.not14, %17 ]
  %.0818 = phi i64 [ 0, %.lr.ph ], [ %18, %17 ]
  %.0917 = phi i32 [ %4, %.lr.ph ], [ %.1, %17 ]
  %.01016 = phi i32 [ 1, %.lr.ph ], [ %.111, %17 ]
  %7 = getelementptr inbounds [1000000 x i64], ptr @arr, i64 0, i64 %.0818
  %8 = load i64, ptr %7, align 8, !tbaa !5
  %9 = sext i32 %.0917 to i64
  %10 = sub nsw i64 %8, %9
  %.not = icmp slt i64 %10, %0
  br i1 %.not, label %17, label %11

11:                                               ; preds = %6
  %12 = add nsw i32 %.01016, 1
  %13 = sext i32 %12 to i64
  %14 = icmp eq i64 %5, %13
  br i1 %14, label %.critedge, label %15

15:                                               ; preds = %11
  %16 = trunc i64 %8 to i32
  br label %17

17:                                               ; preds = %6, %15
  %.111 = phi i32 [ %12, %15 ], [ %.01016, %6 ]
  %.1 = phi i32 [ %16, %15 ], [ %.0917, %6 ]
  %18 = add nuw nsw i64 %.0818, 1
  %.not14 = icmp slt i64 %18, %2
  %exitcond.not = icmp eq i64 %18, %2
  br i1 %exitcond.not, label %.critedge, label %6, !llvm.loop !9

.critedge:                                        ; preds = %11, %17, %1
  %.not14.lcssa = phi i1 [ false, %1 ], [ %.not14, %17 ], [ %.not1419, %11 ]
  ret i1 %.not14.lcssa
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, 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 = !{!"long long", !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,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass