; LLVM IR from ERGO-Code/HiGHS :: src/ipm/basiclu (lu_file)

; 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: nounwind uwtable
define dso_local void @lu_file_empty(i32 noundef %0, ptr noundef %1, ptr noundef %2, ptr noundef %3, ptr noundef %4, i32 noundef %5) #0 {
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  %9 = alloca ptr, align 8
  %10 = alloca ptr, align 8
  %11 = alloca ptr, align 8
  %12 = alloca i32, align 4
  %13 = alloca i32, align 4
  store i32 %0, ptr %7, align 4, !tbaa !5
  store ptr %1, ptr %8, align 8, !tbaa !9
  store ptr %2, ptr %9, align 8, !tbaa !9
  store ptr %3, ptr %10, align 8, !tbaa !9
  store ptr %4, ptr %11, align 8, !tbaa !9
  store i32 %5, ptr %12, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %13) #2
  %14 = load ptr, ptr %8, align 8, !tbaa !9
  %15 = load i32, ptr %7, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds i32, ptr %14, i64 %16
  store i32 0, ptr %17, align 4, !tbaa !5
  %18 = load i32, ptr %12, align 4, !tbaa !5
  %19 = load ptr, ptr %9, align 8, !tbaa !9
  %20 = load i32, ptr %7, align 4, !tbaa !5
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds i32, ptr %19, i64 %21
  store i32 %18, ptr %22, align 4, !tbaa !5
  store i32 0, ptr %13, align 4, !tbaa !5
  br label %23

23:                                               ; preds = %36, %6
  %24 = load i32, ptr %13, align 4, !tbaa !5
  %25 = load i32, ptr %7, align 4, !tbaa !5
  %26 = icmp slt i32 %24, %25
  br i1 %26, label %27, label %39

27:                                               ; preds = %23
  %28 = load ptr, ptr %9, align 8, !tbaa !9
  %29 = load i32, ptr %13, align 4, !tbaa !5
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds i32, ptr %28, i64 %30
  store i32 0, ptr %31, align 4, !tbaa !5
  %32 = load ptr, ptr %8, align 8, !tbaa !9
  %33 = load i32, ptr %13, align 4, !tbaa !5
  %34 = sext i32 %33 to i64
  %35 = getelementptr inbounds i32, ptr %32, i64 %34
  store i32 0, ptr %35, align 4, !tbaa !5
  br label %36

36:                                               ; preds = %27
  %37 = load i32, ptr %13, align 4, !tbaa !5
  %38 = add nsw i32 %37, 1
  store i32 %38, ptr %13, align 4, !tbaa !5
  br label %23, !llvm.loop !11

39:                                               ; preds = %23
  store i32 0, ptr %13, align 4, !tbaa !5
  br label %40

40:                                               ; preds = %57, %39
  %41 = load i32, ptr %13, align 4, !tbaa !5
  %42 = load i32, ptr %7, align 4, !tbaa !5
  %43 = icmp slt i32 %41, %42
  br i1 %43, label %44, label %60

44:                                               ; preds = %40
  %45 = load i32, ptr %13, align 4, !tbaa !5
  %46 = add nsw i32 %45, 1
  %47 = load ptr, ptr %10, align 8, !tbaa !9
  %48 = load i32, ptr %13, align 4, !tbaa !5
  %49 = sext i32 %48 to i64
  %50 = getelementptr inbounds i32, ptr %47, i64 %49
  store i32 %46, ptr %50, align 4, !tbaa !5
  %51 = load i32, ptr %13, align 4, !tbaa !5
  %52 = load ptr, ptr %11, align 8, !tbaa !9
  %53 = load i32, ptr %13, align 4, !tbaa !5
  %54 = add nsw i32 %53, 1
  %55 = sext i32 %54 to i64
  %56 = getelementptr inbounds i32, ptr %52, i64 %55
  store i32 %51, ptr %56, align 4, !tbaa !5
  br label %57

57:                                               ; preds = %44
  %58 = load i32, ptr %13, align 4, !tbaa !5
  %59 = add nsw i32 %58, 1
  store i32 %59, ptr %13, align 4, !tbaa !5
  br label %40, !llvm.loop !13

60:                                               ; preds = %40
  %61 = load ptr, ptr %10, align 8, !tbaa !9
  %62 = load i32, ptr %7, align 4, !tbaa !5
  %63 = sext i32 %62 to i64
  %64 = getelementptr inbounds i32, ptr %61, i64 %63
  store i32 0, ptr %64, align 4, !tbaa !5
  %65 = load i32, ptr %7, align 4, !tbaa !5
  %66 = load ptr, ptr %11, align 8, !tbaa !9
  %67 = getelementptr inbounds i32, ptr %66, i64 0
  store i32 %65, ptr %67, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %13) #2
  ret void
}

; 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 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; 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: nofree norecurse nosync nounwind memory(argmem: write) uwtable
define dso_local void @lu_file_empty(i32 noundef %0, ptr nocapture noundef writeonly %1, ptr nocapture noundef writeonly %2, ptr nocapture noundef writeonly %3, ptr nocapture noundef writeonly %4, i32 noundef %5) local_unnamed_addr #0 {
  %7 = ptrtoint ptr %3 to i64
  %8 = ptrtoint ptr %4 to i64
  %9 = sext i32 %0 to i64
  %10 = getelementptr inbounds i32, ptr %1, i64 %9
  store i32 0, ptr %10, align 4, !tbaa !5
  %11 = getelementptr inbounds i32, ptr %2, i64 %9
  store i32 %5, ptr %11, align 4, !tbaa !5
  %12 = icmp sgt i32 %0, 0
  br i1 %12, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %6
  %13 = ptrtoint ptr %1 to i64
  %14 = ptrtoint ptr %2 to i64
  %wide.trip.count = zext nneg i32 %0 to i64
  %min.iters.check = icmp ult i32 %0, 8
  %15 = sub i64 %13, %14
  %diff.check = icmp ult i64 %15, 32
  %or.cond = or i1 %min.iters.check, %diff.check
  br i1 %or.cond, label %.lr.ph.preheader49, label %vector.ph

.lr.ph.preheader49:                               ; preds = %middle.block, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 0, %.lr.ph.preheader ], [ %n.vec, %middle.block ]
  %xtraiter = and i64 %wide.trip.count, 3
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol

.lr.ph.prol:                                      ; preds = %.lr.ph.preheader49, %.lr.ph.prol
  %indvars.iv.prol = phi i64 [ %indvars.iv.next.prol, %.lr.ph.prol ], [ %indvars.iv.ph, %.lr.ph.preheader49 ]
  %prol.iter = phi i64 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader49 ]
  %16 = getelementptr inbounds i32, ptr %2, i64 %indvars.iv.prol
  store i32 0, ptr %16, align 4, !tbaa !5
  %17 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv.prol
  store i32 0, ptr %17, align 4, !tbaa !5
  %indvars.iv.next.prol = add nuw nsw i64 %indvars.iv.prol, 1
  %prol.iter.next = add i64 %prol.iter, 1
  %prol.iter.cmp.not = icmp eq i64 %prol.iter.next, %xtraiter
  br i1 %prol.iter.cmp.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol, !llvm.loop !9

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader49
  %indvars.iv.unr = phi i64 [ %indvars.iv.ph, %.lr.ph.preheader49 ], [ %indvars.iv.next.prol, %.lr.ph.prol ]
  %18 = sub nsw i64 %indvars.iv.ph, %wide.trip.count
  %19 = icmp ugt i64 %18, -4
  br i1 %19, label %.preheader, label %.lr.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %wide.trip.count, 2147483640
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %20 = getelementptr inbounds i32, ptr %2, i64 %index
  %21 = getelementptr inbounds i8, ptr %20, i64 16
  store <4 x i32> zeroinitializer, ptr %20, align 4, !tbaa !5
  store <4 x i32> zeroinitializer, ptr %21, align 4, !tbaa !5
  %22 = getelementptr inbounds i32, ptr %1, i64 %index
  %23 = getelementptr inbounds i8, ptr %22, i64 16
  store <4 x i32> zeroinitializer, ptr %22, align 4, !tbaa !5
  store <4 x i32> zeroinitializer, ptr %23, align 4, !tbaa !5
  %index.next = add nuw i64 %index, 8
  %24 = icmp eq i64 %index.next, %n.vec
  br i1 %24, label %middle.block, label %vector.body, !llvm.loop !11

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %.preheader, label %.lr.ph.preheader49

.preheader:                                       ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %middle.block
  br i1 %12, label %.lr.ph27.preheader, label %._crit_edge

.lr.ph27.preheader:                               ; preds = %.preheader
  %wide.trip.count32 = zext nneg i32 %0 to i64
  %min.iters.check38 = icmp ult i32 %0, 8
  br i1 %min.iters.check38, label %.lr.ph27.preheader48, label %vector.memcheck34

.lr.ph27.preheader48:                             ; preds = %middle.block36, %vector.memcheck34, %.lr.ph27.preheader
  %indvars.iv29.ph = phi i64 [ 0, %vector.memcheck34 ], [ 0, %.lr.ph27.preheader ], [ %n.vec41, %middle.block36 ]
  %xtraiter50 = and i64 %wide.trip.count, 3
  %lcmp.mod51.not = icmp eq i64 %xtraiter50, 0
  br i1 %lcmp.mod51.not, label %.lr.ph27.prol.loopexit, label %.lr.ph27.prol

.lr.ph27.prol:                                    ; preds = %.lr.ph27.preheader48, %.lr.ph27.prol
  %indvars.iv29.prol = phi i64 [ %indvars.iv.next30.prol, %.lr.ph27.prol ], [ %indvars.iv29.ph, %.lr.ph27.preheader48 ]
  %prol.iter52 = phi i64 [ %prol.iter52.next, %.lr.ph27.prol ], [ 0, %.lr.ph27.preheader48 ]
  %indvars.iv.next30.prol = add nuw nsw i64 %indvars.iv29.prol, 1
  %25 = getelementptr inbounds i32, ptr %3, i64 %indvars.iv29.prol
  %26 = trunc nuw nsw i64 %indvars.iv.next30.prol to i32
  store i32 %26, ptr %25, align 4, !tbaa !5
  %27 = getelementptr inbounds i32, ptr %4, i64 %indvars.iv.next30.prol
  %28 = trunc nuw nsw i64 %indvars.iv29.prol to i32
  store i32 %28, ptr %27, align 4, !tbaa !5
  %prol.iter52.next = add i64 %prol.iter52, 1
  %prol.iter52.cmp.not = icmp eq i64 %prol.iter52.next, %xtraiter50
  br i1 %prol.iter52.cmp.not, label %.lr.ph27.prol.loopexit, label %.lr.ph27.prol, !llvm.loop !15

.lr.ph27.prol.loopexit:                           ; preds = %.lr.ph27.prol, %.lr.ph27.preheader48
  %indvars.iv29.unr = phi i64 [ %indvars.iv29.ph, %.lr.ph27.preheader48 ], [ %indvars.iv.next30.prol, %.lr.ph27.prol ]
  %29 = sub nsw i64 %indvars.iv29.ph, %wide.trip.count
  %30 = icmp ugt i64 %29, -4
  br i1 %30, label %._crit_edge, label %.lr.ph27

vector.memcheck34:                                ; preds = %.lr.ph27.preheader
  %31 = add i64 %8, 4
  %32 = sub i64 %31, %7
  %diff.check35 = icmp ult i64 %32, 32
  br i1 %diff.check35, label %.lr.ph27.preheader48, label %vector.ph39

vector.ph39:                                      ; preds = %vector.memcheck34
  %n.vec41 = and i64 %wide.trip.count, 2147483640
  br label %vector.body43

vector.body43:                                    ; preds = %vector.body43, %vector.ph39
  %index44 = phi i64 [ 0, %vector.ph39 ], [ %index.next46, %vector.body43 ]
  %vec.ind = phi <4 x i32> [ <i32 0, i32 1, i32 2, i32 3>, %vector.ph39 ], [ %vec.ind.next, %vector.body43 ]
  %step.add = add <4 x i32> %vec.ind, <i32 4, i32 4, i32 4, i32 4>
  %33 = insertelement <4 x i64> poison, i64 %index44, i64 0
  %34 = shufflevector <4 x i64> %33, <4 x i64> poison, <4 x i32> zeroinitializer
  %35 = or disjoint <4 x i64> %34, <i64 1, i64 2, i64 3, i64 4>
  %36 = getelementptr inbounds i32, ptr %3, i64 %index44
  %37 = trunc <4 x i64> %35 to <4 x i32>
  %38 = trunc <4 x i64> %34 to <4 x i32>
  %39 = add <4 x i32> %38, <i32 5, i32 6, i32 7, i32 8>
  %40 = getelementptr inbounds i8, ptr %36, i64 16
  store <4 x i32> %37, ptr %36, align 4, !tbaa !5
  store <4 x i32> %39, ptr %40, align 4, !tbaa !5
  %41 = extractelement <4 x i64> %35, i64 0
  %42 = getelementptr inbounds i32, ptr %4, i64 %41
  %43 = getelementptr inbounds i8, ptr %42, i64 16
  store <4 x i32> %vec.ind, ptr %42, align 4, !tbaa !5
  store <4 x i32> %step.add, ptr %43, align 4, !tbaa !5
  %index.next46 = add nuw i64 %index44, 8
  %vec.ind.next = add <4 x i32> %vec.ind, <i32 8, i32 8, i32 8, i32 8>
  %44 = icmp eq i64 %index.next46, %n.vec41
  br i1 %44, label %middle.block36, label %vector.body43, !llvm.loop !16

middle.block36:                                   ; preds = %vector.body43
  %cmp.n47 = icmp eq i64 %n.vec41, %wide.trip.count
  br i1 %cmp.n47, label %._crit_edge, label %.lr.ph27.preheader48

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next.3, %.lr.ph ], [ %indvars.iv.unr, %.lr.ph.prol.loopexit ]
  %45 = getelementptr inbounds i32, ptr %2, i64 %indvars.iv
  store i32 0, ptr %45, align 4, !tbaa !5
  %46 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv
  store i32 0, ptr %46, align 4, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %47 = getelementptr inbounds i32, ptr %2, i64 %indvars.iv.next
  store i32 0, ptr %47, align 4, !tbaa !5
  %48 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv.next
  store i32 0, ptr %48, align 4, !tbaa !5
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %49 = getelementptr inbounds i32, ptr %2, i64 %indvars.iv.next.1
  store i32 0, ptr %49, align 4, !tbaa !5
  %50 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv.next.1
  store i32 0, ptr %50, align 4, !tbaa !5
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %51 = getelementptr inbounds i32, ptr %2, i64 %indvars.iv.next.2
  store i32 0, ptr %51, align 4, !tbaa !5
  %52 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv.next.2
  store i32 0, ptr %52, align 4, !tbaa !5
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 4
  %exitcond.not.3 = icmp eq i64 %indvars.iv.next.3, %wide.trip.count
  br i1 %exitcond.not.3, label %.preheader, label %.lr.ph, !llvm.loop !17

.lr.ph27:                                         ; preds = %.lr.ph27.prol.loopexit, %.lr.ph27
  %indvars.iv29 = phi i64 [ %indvars.iv.next30.3, %.lr.ph27 ], [ %indvars.iv29.unr, %.lr.ph27.prol.loopexit ]
  %indvars.iv.next30 = add nuw nsw i64 %indvars.iv29, 1
  %53 = getelementptr inbounds i32, ptr %3, i64 %indvars.iv29
  %54 = trunc nuw nsw i64 %indvars.iv.next30 to i32
  store i32 %54, ptr %53, align 4, !tbaa !5
  %55 = getelementptr inbounds i32, ptr %4, i64 %indvars.iv.next30
  %56 = trunc nuw nsw i64 %indvars.iv29 to i32
  store i32 %56, ptr %55, align 4, !tbaa !5
  %indvars.iv.next30.1 = add nuw nsw i64 %indvars.iv29, 2
  %57 = getelementptr inbounds i32, ptr %3, i64 %indvars.iv.next30
  %58 = trunc nuw nsw i64 %indvars.iv.next30.1 to i32
  store i32 %58, ptr %57, align 4, !tbaa !5
  %59 = getelementptr inbounds i32, ptr %4, i64 %indvars.iv.next30.1
  %60 = trunc nuw nsw i64 %indvars.iv.next30 to i32
  store i32 %60, ptr %59, align 4, !tbaa !5
  %indvars.iv.next30.2 = add nuw nsw i64 %indvars.iv29, 3
  %61 = getelementptr inbounds i32, ptr %3, i64 %indvars.iv.next30.1
  %62 = trunc nuw nsw i64 %indvars.iv.next30.2 to i32
  store i32 %62, ptr %61, align 4, !tbaa !5
  %63 = getelementptr inbounds i32, ptr %4, i64 %indvars.iv.next30.2
  %64 = trunc nuw nsw i64 %indvars.iv.next30.1 to i32
  store i32 %64, ptr %63, align 4, !tbaa !5
  %indvars.iv.next30.3 = add nuw nsw i64 %indvars.iv29, 4
  %65 = getelementptr inbounds i32, ptr %3, i64 %indvars.iv.next30.2
  %66 = trunc nuw nsw i64 %indvars.iv.next30.3 to i32
  store i32 %66, ptr %65, align 4, !tbaa !5
  %67 = getelementptr inbounds i32, ptr %4, i64 %indvars.iv.next30.3
  %68 = trunc nuw nsw i64 %indvars.iv.next30.2 to i32
  store i32 %68, ptr %67, align 4, !tbaa !5
  %exitcond33.not.3 = icmp eq i64 %indvars.iv.next30.3, %wide.trip.count32
  br i1 %exitcond33.not.3, label %._crit_edge, label %.lr.ph27, !llvm.loop !18

._crit_edge:                                      ; preds = %.lr.ph27.prol.loopexit, %.lr.ph27, %middle.block36, %6, %.preheader
  %69 = getelementptr inbounds i32, ptr %3, i64 %9
  store i32 0, ptr %69, align 4, !tbaa !5
  store i32 %0, ptr %4, align 4, !tbaa !5
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: write) 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.unroll.disable"}
!11 = distinct !{!11, !12, !13, !14}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!"llvm.loop.isvectorized", i32 1}
!14 = !{!"llvm.loop.unroll.runtime.disable"}
!15 = distinct !{!15, !10}
!16 = distinct !{!16, !12, !13, !14}
!17 = distinct !{!17, !12, !13}
!18 = distinct !{!18, !12, !13}


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