; LLVM IR from sgtlaugh/algovault :: code_library/dancing_links.ll (ZN3dlx4initEi)

; 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"

@_ZN3dlx1LE = external dso_local global [2000010 x i32], align 16
@_ZN3dlx1RE = external dso_local global [2000010 x i32], align 16
@_ZN3dlx1UE = external dso_local global [2000010 x i32], align 16
@_ZN3dlx1DE = external dso_local global [2000010 x i32], align 16
@_ZN3dlx1nE = external dso_local global i32, align 4
@_ZN3dlx3idxE = external dso_local global i32, align 4
@_ZN3dlx12column_countE = external dso_local global [2000010 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN3dlx4initEi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.memset.p0.i64(ptr align 16 @_ZN3dlx12column_countE, i8 0, i64 8000040, i1 false)
  %4 = load i32, ptr %2, align 4, !tbaa !5
  store i32 %4, ptr @_ZN3dlx1nE, align 4, !tbaa !5
  %5 = load i32, ptr @_ZN3dlx1nE, align 4, !tbaa !5
  %6 = add nsw i32 %5, 1
  store i32 %6, ptr @_ZN3dlx3idxE, 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 %7

7:                                                ; preds = %30, %1
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = load i32, ptr @_ZN3dlx1nE, align 4, !tbaa !5
  %10 = icmp sle i32 %8, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  br label %33

12:                                               ; preds = %7
  %13 = load i32, ptr %3, align 4, !tbaa !5
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [2000010 x i32], ptr @_ZN3dlx1DE, i64 0, i64 %15
  store i32 %13, ptr %16, align 4, !tbaa !5
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds [2000010 x i32], ptr @_ZN3dlx1UE, i64 0, i64 %18
  store i32 %13, ptr %19, align 4, !tbaa !5
  %20 = load i32, ptr %3, align 4, !tbaa !5
  %21 = sub nsw i32 %20, 1
  %22 = load i32, ptr %3, align 4, !tbaa !5
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds [2000010 x i32], ptr @_ZN3dlx1LE, i64 0, i64 %23
  store i32 %21, ptr %24, align 4, !tbaa !5
  %25 = load i32, ptr %3, align 4, !tbaa !5
  %26 = add nsw i32 %25, 1
  %27 = load i32, ptr %3, align 4, !tbaa !5
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds [2000010 x i32], ptr @_ZN3dlx1RE, i64 0, i64 %28
  store i32 %26, ptr %29, align 4, !tbaa !5
  br label %30

30:                                               ; preds = %12
  %31 = load i32, ptr %3, align 4, !tbaa !5
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %3, align 4, !tbaa !5
  br label %7, !llvm.loop !9

33:                                               ; preds = %11
  %34 = load i32, ptr @_ZN3dlx1nE, align 4, !tbaa !5
  store i32 %34, ptr @_ZN3dlx1LE, align 16, !tbaa !5
  %35 = load i32, ptr @_ZN3dlx1nE, align 4, !tbaa !5
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds [2000010 x i32], ptr @_ZN3dlx1RE, i64 0, i64 %36
  store i32 0, ptr %37, align 4, !tbaa !5
  ret void
}

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

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

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

@_ZN3dlx1LE = external dso_local local_unnamed_addr global [2000010 x i32], align 16
@_ZN3dlx1RE = external dso_local local_unnamed_addr global [2000010 x i32], align 16
@_ZN3dlx1UE = external dso_local local_unnamed_addr global [2000010 x i32], align 16
@_ZN3dlx1DE = external dso_local local_unnamed_addr global [2000010 x i32], align 16
@_ZN3dlx1nE = external dso_local local_unnamed_addr global i32, align 4
@_ZN3dlx3idxE = external dso_local local_unnamed_addr global i32, align 4
@_ZN3dlx12column_countE = external dso_local local_unnamed_addr global [2000010 x i32], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind memory(write, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_ZN3dlx4initEi(i32 noundef %0) local_unnamed_addr #0 {
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(8000040) @_ZN3dlx12column_countE, i8 0, i64 8000040, i1 false)
  store i32 %0, ptr @_ZN3dlx1nE, align 4, !tbaa !5
  %2 = add i32 %0, 1
  store i32 %2, ptr @_ZN3dlx3idxE, align 4, !tbaa !5
  %.not11 = icmp slt i32 %0, 0
  br i1 %.not11, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %1
  %wide.trip.count = zext i32 %2 to i64
  %min.iters.check = icmp ult i32 %2, 8
  br i1 %min.iters.check, label %.lr.ph.preheader23, label %vector.ph

.lr.ph.preheader23:                               ; preds = %middle.block, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 0, %.lr.ph.preheader ], [ %n.vec, %middle.block ]
  br label %.lr.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %wide.trip.count, 4294967288
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.ind = phi <4 x i64> [ <i64 0, i64 1, i64 2, i64 3>, %vector.ph ], [ %vec.ind.next, %vector.body ]
  %vec.ind15 = phi <4 x i32> [ <i32 0, i32 1, i32 2, i32 3>, %vector.ph ], [ %vec.ind.next18, %vector.body ]
  %vec.ind19 = phi <4 x i32> [ <i32 0, i32 1, i32 2, i32 3>, %vector.ph ], [ %vec.ind.next22, %vector.body ]
  %step.add16 = add <4 x i32> %vec.ind15, <i32 4, i32 4, i32 4, i32 4>
  %3 = getelementptr inbounds [2000010 x i32], ptr @_ZN3dlx1DE, i64 0, i64 %index
  %4 = getelementptr inbounds i8, ptr %3, i64 16
  store <4 x i32> %vec.ind15, ptr %3, align 16, !tbaa !5
  store <4 x i32> %step.add16, ptr %4, align 16, !tbaa !5
  %5 = getelementptr inbounds [2000010 x i32], ptr @_ZN3dlx1UE, i64 0, i64 %index
  %6 = getelementptr inbounds i8, ptr %5, i64 16
  store <4 x i32> %vec.ind15, ptr %5, align 16, !tbaa !5
  store <4 x i32> %step.add16, ptr %6, align 16, !tbaa !5
  %7 = getelementptr inbounds [2000010 x i32], ptr @_ZN3dlx1LE, i64 0, i64 %index
  %8 = add <4 x i32> %vec.ind19, <i32 -1, i32 -1, i32 -1, i32 -1>
  %9 = add <4 x i32> %vec.ind19, <i32 3, i32 3, i32 3, i32 3>
  %10 = getelementptr inbounds i8, ptr %7, i64 16
  store <4 x i32> %8, ptr %7, align 16, !tbaa !5
  store <4 x i32> %9, ptr %10, align 16, !tbaa !5
  %11 = getelementptr inbounds [2000010 x i32], ptr @_ZN3dlx1RE, i64 0, i64 %index
  %12 = trunc <4 x i64> %vec.ind to <4 x i32>
  %13 = add <4 x i32> %12, <i32 1, i32 1, i32 1, i32 1>
  %14 = trunc <4 x i64> %vec.ind to <4 x i32>
  %15 = add <4 x i32> %14, <i32 5, i32 5, i32 5, i32 5>
  %16 = getelementptr inbounds i8, ptr %11, i64 16
  store <4 x i32> %13, ptr %11, align 16, !tbaa !5
  store <4 x i32> %15, ptr %16, align 16, !tbaa !5
  %index.next = add nuw i64 %index, 8
  %vec.ind.next = add <4 x i64> %vec.ind, <i64 8, i64 8, i64 8, i64 8>
  %vec.ind.next18 = add <4 x i32> %vec.ind15, <i32 8, i32 8, i32 8, i32 8>
  %vec.ind.next22 = add <4 x i32> %vec.ind19, <i32 8, i32 8, i32 8, i32 8>
  %17 = icmp eq i64 %index.next, %n.vec
  br i1 %17, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader23

._crit_edge:                                      ; preds = %.lr.ph, %middle.block, %1
  store i32 %0, ptr @_ZN3dlx1LE, align 16, !tbaa !5
  %18 = sext i32 %0 to i64
  %19 = getelementptr inbounds [2000010 x i32], ptr @_ZN3dlx1RE, i64 0, i64 %18
  store i32 0, ptr %19, align 4, !tbaa !5
  ret void

.lr.ph:                                           ; preds = %.lr.ph.preheader23, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ %indvars.iv.ph, %.lr.ph.preheader23 ]
  %20 = getelementptr inbounds [2000010 x i32], ptr @_ZN3dlx1DE, i64 0, i64 %indvars.iv
  %21 = trunc nuw nsw i64 %indvars.iv to i32
  store i32 %21, ptr %20, align 4, !tbaa !5
  %22 = getelementptr inbounds [2000010 x i32], ptr @_ZN3dlx1UE, i64 0, i64 %indvars.iv
  store i32 %21, ptr %22, align 4, !tbaa !5
  %23 = getelementptr inbounds [2000010 x i32], ptr @_ZN3dlx1LE, i64 0, i64 %indvars.iv
  %24 = trunc i64 %indvars.iv to i32
  %25 = add i32 %24, -1
  store i32 %25, ptr %23, align 4, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %26 = getelementptr inbounds [2000010 x i32], ptr @_ZN3dlx1RE, i64 0, i64 %indvars.iv
  %27 = trunc nuw i64 %indvars.iv.next to i32
  store i32 %27, ptr %26, align 4, !tbaa !5
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13
}

; 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 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"}
!9 = distinct !{!9, !10, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !10, !12, !11}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass