; LLVM IR from ekoontz/graphlab :: src/graphlab/extern/metis/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: 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 void @ChangeMesh2FNumbering3(i64 noundef %0, ptr noundef %1) #1 {
  %3 = alloca i64, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i64, align 8
  store i64 %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store i64 0, ptr %5, align 8, !tbaa !5
  br label %6

6:                                                ; preds = %16, %2
  %7 = load i64, ptr %5, align 8, !tbaa !5
  %8 = load i64, ptr %3, align 8, !tbaa !5
  %9 = icmp slt i64 %7, %8
  br i1 %9, label %10, label %19

10:                                               ; preds = %6
  %11 = load ptr, ptr %4, align 8, !tbaa !9
  %12 = load i64, ptr %5, align 8, !tbaa !5
  %13 = getelementptr inbounds i64, ptr %11, i64 %12
  %14 = load i64, ptr %13, align 8, !tbaa !5
  %15 = add nsw i64 %14, 1
  store i64 %15, ptr %13, align 8, !tbaa !5
  br label %16

16:                                               ; preds = %10
  %17 = load i64, ptr %5, align 8, !tbaa !5
  %18 = add nsw i64 %17, 1
  store i64 %18, ptr %5, align 8, !tbaa !5
  br label %6, !llvm.loop !11

19:                                               ; preds = %6
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret void
}

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 = { 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 = distinct !{!11, !12}
!12 = !{!"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"

; Function Attrs: nofree norecurse nosync nounwind memory(argmem: readwrite) uwtable
define dso_local void @ChangeMesh2FNumbering3(i64 noundef %0, ptr nocapture noundef %1) local_unnamed_addr #0 {
  %3 = icmp sgt i64 %0, 0
  br i1 %3, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %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, 9223372036854775804
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %4 = getelementptr inbounds i64, ptr %1, i64 %index
  %5 = getelementptr inbounds i8, ptr %4, i64 16
  %wide.load = load <2 x i64>, ptr %4, align 8, !tbaa !5
  %wide.load5 = load <2 x i64>, ptr %5, align 8, !tbaa !5
  %6 = add nsw <2 x i64> %wide.load, <i64 1, i64 1>
  %7 = add nsw <2 x i64> %wide.load5, <i64 1, i64 1>
  store <2 x i64> %6, ptr %4, align 8, !tbaa !5
  store <2 x i64> %7, ptr %5, align 8, !tbaa !5
  %index.next = add nuw i64 %index, 4
  %8 = icmp eq i64 %index.next, %n.vec
  br i1 %8, label %middle.block, label %vector.body, !llvm.loop !9

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
  %.04.ph = phi i64 [ 0, %.lr.ph.preheader ], [ %n.vec, %middle.block ]
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader6, %.lr.ph
  %.04 = phi i64 [ %12, %.lr.ph ], [ %.04.ph, %.lr.ph.preheader6 ]
  %9 = getelementptr inbounds i64, ptr %1, i64 %.04
  %10 = load i64, ptr %9, align 8, !tbaa !5
  %11 = add nsw i64 %10, 1
  store i64 %11, ptr %9, align 8, !tbaa !5
  %12 = add nuw nsw i64 %.04, 1
  %exitcond.not = icmp eq i64 %12, %0
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %.lr.ph, %middle.block, %2
  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 = !{!"long", !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}


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