; LLVM IR from Tunghohin/Competitive_Coding :: Hdu/hdu4738.ll (Z4initi)

; 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"

@head = external dso_local global [1010 x i32], align 16
@tot = external dso_local global i32, align 4
@dfn = external dso_local global [1010 x i32], align 16
@low = external dso_local global [1010 x i32], align 16
@timestamp = external dso_local global i32, align 4
@is_bridge = external dso_local global [200 x i8], align 16

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z4initi(i32 noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 0, ptr %3, align 4, !tbaa !5
  br label %4

4:                                                ; preds = %19, %1
  %5 = load i32, ptr %3, align 4, !tbaa !5
  %6 = load i32, ptr %2, align 4, !tbaa !5
  %7 = icmp sle i32 %5, %6
  br i1 %7, label %9, label %8

8:                                                ; preds = %4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  br label %22

9:                                                ; preds = %4
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds [1010 x i32], ptr @low, i64 0, i64 %11
  store i32 0, ptr %12, align 4, !tbaa !5
  %13 = load i32, ptr %3, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [1010 x i32], ptr @dfn, i64 0, i64 %14
  store i32 0, ptr %15, align 4, !tbaa !5
  %16 = load i32, ptr %3, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds [1010 x i32], ptr @head, i64 0, i64 %17
  store i32 0, ptr %18, align 4, !tbaa !5
  br label %19

19:                                               ; preds = %9
  %20 = load i32, ptr %3, align 4, !tbaa !5
  %21 = add nsw i32 %20, 1
  store i32 %21, ptr %3, align 4, !tbaa !5
  br label %4, !llvm.loop !9

22:                                               ; preds = %8
  store i32 0, ptr @tot, align 4, !tbaa !5
  store i32 0, ptr @timestamp, align 4, !tbaa !5
  call void @llvm.memset.p0.i64(ptr align 16 @is_bridge, i8 0, i64 200, i1 false)
  ret void
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { nocallback nofree nounwind willreturn memory(argmem: write) }
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"

@head = external dso_local local_unnamed_addr global [1010 x i32], align 16
@tot = external dso_local local_unnamed_addr global i32, align 4
@dfn = external dso_local local_unnamed_addr global [1010 x i32], align 16
@low = external dso_local local_unnamed_addr global [1010 x i32], align 16
@timestamp = external dso_local local_unnamed_addr global i32, align 4
@is_bridge = external dso_local local_unnamed_addr global [200 x i8], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(write, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z4initi(i32 noundef %0) local_unnamed_addr #0 {
  %.not6 = icmp slt i32 %0, 0
  br i1 %.not6, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %1
  %2 = add nuw i32 %0, 1
  %3 = zext i32 %2 to i64
  %4 = shl nuw nsw i64 %3, 2
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(1) @low, i8 0, i64 %4, i1 false), !tbaa !5
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(1) @dfn, i8 0, i64 %4, i1 false), !tbaa !5
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(1) @head, i8 0, i64 %4, i1 false), !tbaa !5
  br label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph.preheader, %1
  store i32 0, ptr @tot, align 4, !tbaa !5
  store i32 0, ptr @timestamp, align 4, !tbaa !5
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(200) @is_bridge, i8 0, i64 200, i1 false)
  ret void
}

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(write, 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" }
attributes #1 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: write) }

!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"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopIdiomRecognizePass,LoopRotatePass,LoopSimplifyPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass