; LLVM IR from VastoLorde95/Competitive-Programming :: Hackerrank/Company Contests/Zalando Codesprint 2016/Problem G/G.ll (Z5checkx)

; 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
@m = external dso_local global i64, align 8
@p = external dso_local global [100100 x i64], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z5checkx(i64 noundef %0) #0 {
  %2 = alloca i1, align 1
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i64 %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  store i64 0, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !9
  br label %7

7:                                                ; preds = %27, %1
  %8 = load i32, ptr %5, align 4, !tbaa !9
  %9 = sext i32 %8 to i64
  %10 = load i64, ptr @m, align 8, !tbaa !5
  %11 = icmp slt i64 %9, %10
  br i1 %11, label %13, label %12

12:                                               ; preds = %7
  store i32 2, ptr %6, align 4
  br label %30

13:                                               ; preds = %7
  %14 = load i64, ptr %3, align 8, !tbaa !5
  %15 = load i32, ptr %5, align 4, !tbaa !9
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [100100 x i64], ptr @p, i64 0, i64 %16
  %18 = load i64, ptr %17, align 8, !tbaa !5
  %19 = sdiv i64 %14, %18
  %20 = load i64, ptr %4, align 8, !tbaa !5
  %21 = add nsw i64 %20, %19
  store i64 %21, ptr %4, align 8, !tbaa !5
  %22 = load i64, ptr %4, align 8, !tbaa !5
  %23 = load i64, ptr @n, align 8, !tbaa !5
  %24 = icmp sge i64 %22, %23
  br i1 %24, label %25, label %26

25:                                               ; preds = %13
  store i1 true, ptr %2, align 1
  store i32 1, ptr %6, align 4
  br label %30

26:                                               ; preds = %13
  br label %27

27:                                               ; preds = %26
  %28 = load i32, ptr %5, align 4, !tbaa !9
  %29 = add nsw i32 %28, 1
  store i32 %29, ptr %5, align 4, !tbaa !9
  br label %7, !llvm.loop !11

30:                                               ; preds = %25, %12
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  %31 = load i32, ptr %6, align 4
  switch i32 %31, label %33 [
    i32 2, label %32
  ]

32:                                               ; preds = %30
  store i1 false, ptr %2, align 1
  store i32 1, ptr %6, align 4
  br label %33

33:                                               ; preds = %32, %30
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  %34 = load i1, ptr %2, align 1
  ret i1 %34
}

; 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
@m = external dso_local local_unnamed_addr global i64, align 8
@p = external dso_local local_unnamed_addr global [100100 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 @_Z5checkx(i64 noundef %0) local_unnamed_addr #0 {
  %2 = load i64, ptr @m, align 8, !tbaa !5
  %.not1213 = icmp sgt i64 %2, 0
  br i1 %.not1213, label %.lr.ph, label %.critedge

.lr.ph:                                           ; preds = %1
  %3 = load i64, ptr @n, align 8, !tbaa !5
  %4 = load i64, ptr @p, align 16, !tbaa !5
  %5 = sdiv i64 %0, %4
  %.not19 = icmp slt i64 %5, %3
  br i1 %.not19, label %.lr.ph21, label %.critedge

.lr.ph21:                                         ; preds = %.lr.ph, %7
  %6 = phi i64 [ %11, %7 ], [ %5, %.lr.ph ]
  %indvars.iv20 = phi i64 [ %indvars.iv.next, %7 ], [ 0, %.lr.ph ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv20, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %2
  br i1 %exitcond.not, label %.critedge.loopexit, label %7, !llvm.loop !9

7:                                                ; preds = %.lr.ph21
  %8 = getelementptr inbounds [100100 x i64], ptr @p, i64 0, i64 %indvars.iv.next
  %9 = load i64, ptr %8, align 8, !tbaa !5
  %10 = sdiv i64 %0, %9
  %11 = add nsw i64 %10, %6
  %.not = icmp slt i64 %11, %3
  br i1 %.not, label %.lr.ph21, label %.critedge.loopexit, !llvm.loop !9

.critedge.loopexit:                               ; preds = %7, %.lr.ph21
  %.not12.le = icmp sgt i64 %2, %indvars.iv.next
  br label %.critedge

.critedge:                                        ; preds = %.critedge.loopexit, %.lr.ph, %1
  %.not12.lcssa = phi i1 [ false, %1 ], [ true, %.lr.ph ], [ %.not12.le, %.critedge.loopexit ]
  ret i1 %.not12.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,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass