; LLVM IR from GGiecold-zz/Cluster_Ensembles :: src/Cluster_Ensembles/Hypergraph_Partitioning/metis-5.1.0/libmetis (fortran)

; 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 @libmetis__Change2CNumbering(i32 noundef %0, ptr noundef %1, ptr noundef %2) #0 {
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !9
  store ptr %2, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %7, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %19, %3
  %9 = load i32, ptr %7, align 4, !tbaa !5
  %10 = load i32, ptr %4, align 4, !tbaa !5
  %11 = icmp sle i32 %9, %10
  br i1 %11, label %12, label %22

12:                                               ; preds = %8
  %13 = load ptr, ptr %5, align 8, !tbaa !9
  %14 = load i32, ptr %7, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds i32, ptr %13, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = add nsw i32 %17, -1
  store i32 %18, ptr %16, align 4, !tbaa !5
  br label %19

19:                                               ; preds = %12
  %20 = load i32, ptr %7, align 4, !tbaa !5
  %21 = add nsw i32 %20, 1
  store i32 %21, ptr %7, align 4, !tbaa !5
  br label %8, !llvm.loop !11

22:                                               ; preds = %8
  store i32 0, ptr %7, align 4, !tbaa !5
  br label %23

23:                                               ; preds = %38, %22
  %24 = load i32, ptr %7, align 4, !tbaa !5
  %25 = load ptr, ptr %5, align 8, !tbaa !9
  %26 = load i32, ptr %4, align 4, !tbaa !5
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds i32, ptr %25, i64 %27
  %29 = load i32, ptr %28, align 4, !tbaa !5
  %30 = icmp slt i32 %24, %29
  br i1 %30, label %31, label %41

31:                                               ; preds = %23
  %32 = load ptr, ptr %6, align 8, !tbaa !9
  %33 = load i32, ptr %7, align 4, !tbaa !5
  %34 = sext i32 %33 to i64
  %35 = getelementptr inbounds i32, ptr %32, i64 %34
  %36 = load i32, ptr %35, align 4, !tbaa !5
  %37 = add nsw i32 %36, -1
  store i32 %37, ptr %35, align 4, !tbaa !5
  br label %38

38:                                               ; preds = %31
  %39 = load i32, ptr %7, align 4, !tbaa !5
  %40 = add nsw i32 %39, 1
  store i32 %40, ptr %7, align 4, !tbaa !5
  br label %23, !llvm.loop !13

41:                                               ; preds = %23
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #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: readwrite) uwtable
define dso_local void @libmetis__Change2CNumbering(i32 noundef %0, ptr nocapture noundef %1, ptr nocapture noundef %2) local_unnamed_addr #0 {
  %.not11 = icmp slt i32 %0, 0
  br i1 %.not11, label %.preheader, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %3
  %4 = add nuw i32 %0, 1
  %wide.trip.count = zext i32 %4 to i64
  %min.iters.check = icmp ult i32 %0, 7
  br i1 %min.iters.check, label %.lr.ph.preheader20, label %vector.ph

.lr.ph.preheader20:                               ; 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 ]
  %5 = getelementptr inbounds i32, ptr %1, i64 %index
  %6 = getelementptr inbounds i8, ptr %5, i64 16
  %wide.load = load <4 x i32>, ptr %5, align 4, !tbaa !5
  %wide.load19 = load <4 x i32>, ptr %6, align 4, !tbaa !5
  %7 = add nsw <4 x i32> %wide.load, <i32 -1, i32 -1, i32 -1, i32 -1>
  %8 = add nsw <4 x i32> %wide.load19, <i32 -1, i32 -1, i32 -1, i32 -1>
  store <4 x i32> %7, ptr %5, align 4, !tbaa !5
  store <4 x i32> %8, ptr %6, align 4, !tbaa !5
  %index.next = add nuw i64 %index, 8
  %9 = icmp eq i64 %index.next, %n.vec
  br i1 %9, 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 %.preheader, label %.lr.ph.preheader20

.preheader:                                       ; preds = %.lr.ph, %middle.block, %3
  %10 = sext i32 %0 to i64
  %11 = getelementptr inbounds i32, ptr %1, i64 %10
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %13 = icmp sgt i32 %12, 0
  br i1 %13, label %.lr.ph14, label %._crit_edge

.lr.ph:                                           ; preds = %.lr.ph.preheader20, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ %indvars.iv.ph, %.lr.ph.preheader20 ]
  %14 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv
  %15 = load i32, ptr %14, align 4, !tbaa !5
  %16 = add nsw i32 %15, -1
  store i32 %16, ptr %14, align 4, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %.preheader, label %.lr.ph, !llvm.loop !13

.lr.ph14:                                         ; preds = %.preheader, %.lr.ph14
  %indvars.iv16 = phi i64 [ %indvars.iv.next17, %.lr.ph14 ], [ 0, %.preheader ]
  %17 = getelementptr inbounds i32, ptr %2, i64 %indvars.iv16
  %18 = load i32, ptr %17, align 4, !tbaa !5
  %19 = add nsw i32 %18, -1
  store i32 %19, ptr %17, align 4, !tbaa !5
  %indvars.iv.next17 = add nuw nsw i64 %indvars.iv16, 1
  %20 = load i32, ptr %11, align 4, !tbaa !5
  %21 = sext i32 %20 to i64
  %22 = icmp slt i64 %indvars.iv.next17, %21
  br i1 %22, label %.lr.ph14, label %._crit_edge, !llvm.loop !14

._crit_edge:                                      ; preds = %.lr.ph14, %.preheader
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: readwrite) 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, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !10, !12, !11}
!14 = distinct !{!14, !10}


; Effective O3 passes: GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass