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

; 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"

%struct.ikv_t = type { i32, i32 }

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

8:                                                ; preds = %16, %3
  %9 = load i64, ptr %7, align 8, !tbaa !5
  %10 = load i64, ptr %5, align 8, !tbaa !5
  %11 = icmp ult i64 %9, %10
  br i1 %11, label %12, label %19

12:                                               ; preds = %8
  %13 = load ptr, ptr %6, align 8, !tbaa !9
  %14 = load i64, ptr %7, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.ikv_t, ptr %13, i64 %14
  call void @llvm.memcpy.p0.p0.i64(ptr align 4 %15, ptr align 4 %4, i64 8, i1 false), !tbaa.struct !11
  br label %16

16:                                               ; preds = %12
  %17 = load i64, ptr %7, align 8, !tbaa !5
  %18 = add i64 %17, 1
  store i64 %18, ptr %7, align 8, !tbaa !5
  br label %8, !llvm.loop !14

19:                                               ; preds = %8
  %20 = load ptr, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  ret ptr %20
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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: 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 = !{!"long", !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 = !{i64 0, i64 4, !12, i64 4, i64 4, !12}
!12 = !{!13, !13, i64 0}
!13 = !{!"int", !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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"

%struct.ikv_t = type { i32, i32 }

; Function Attrs: nofree norecurse nosync nounwind memory(argmem: write) uwtable
define dso_local noundef ptr @libmetis__ikvset(i64 noundef %0, i64 %1, ptr noundef returned writeonly %2) local_unnamed_addr #0 {
  %.not = icmp eq i64 %0, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %3
  %min.iters.check = icmp ult i64 %0, 4
  br i1 %min.iters.check, label %.lr.ph.preheader6, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %0, -4
  %broadcast.splatinsert = insertelement <2 x i64> poison, i64 %1, i64 0
  %broadcast.splat = shufflevector <2 x i64> %broadcast.splatinsert, <2 x i64> poison, <2 x i32> zeroinitializer
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %4 = getelementptr inbounds %struct.ikv_t, ptr %2, i64 %index
  %5 = getelementptr inbounds i8, ptr %4, i64 16
  store <2 x i64> %broadcast.splat, ptr %4, align 4
  store <2 x i64> %broadcast.splat, ptr %5, align 4
  %index.next = add nuw i64 %index, 4
  %6 = icmp eq i64 %index.next, %n.vec
  br i1 %6, label %middle.block, label %vector.body, !llvm.loop !5

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %0
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader6

.lr.ph.preheader6:                                ; preds = %middle.block, %.lr.ph.preheader
  %.05.ph = phi i64 [ 0, %.lr.ph.preheader ], [ %n.vec, %middle.block ]
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader6, %.lr.ph
  %.05 = phi i64 [ %8, %.lr.ph ], [ %.05.ph, %.lr.ph.preheader6 ]
  %7 = getelementptr inbounds %struct.ikv_t, ptr %2, i64 %.05
  store i64 %1, ptr %7, align 4
  %8 = add nuw i64 %.05, 1
  %exitcond.not = icmp eq i64 %8, %0
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %middle.block, %3
  ret ptr %2
}

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 = distinct !{!5, !6, !7, !8}
!6 = !{!"llvm.loop.mustprogress"}
!7 = !{!"llvm.loop.isvectorized", i32 1}
!8 = !{!"llvm.loop.unroll.runtime.disable"}
!9 = distinct !{!9, !6, !8, !7}


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