; LLVM IR from TheAlgorithms/C-Plus-Plus :: graph/kruskal.ll (Z7initialv)

; 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.std::array" = type { [1000005 x i64] }

@parent = external dso_local global %"struct.std::array", align 8
@node = external dso_local global i64, align 8
@edge = external dso_local global i64, align 8

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z7initialv() #0 {
  %1 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #2
  store i32 0, ptr %1, align 4, !tbaa !5
  br label %2

2:                                                ; preds = %16, %0
  %3 = load i32, ptr %1, align 4, !tbaa !5
  %4 = sext i32 %3 to i64
  %5 = load i64, ptr @node, align 8, !tbaa !9
  %6 = load i64, ptr @edge, align 8, !tbaa !9
  %7 = add nsw i64 %5, %6
  %8 = icmp slt i64 %4, %7
  br i1 %8, label %10, label %9

9:                                                ; preds = %2
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #2
  br label %19

10:                                               ; preds = %2
  %11 = load i32, ptr %1, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = load i32, ptr %1, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5arrayIlLm1000005EEixEm(ptr noundef nonnull align 8 dereferenceable(8000040) @parent, i64 noundef %14) #2
  store i64 %12, ptr %15, align 8, !tbaa !9
  br label %16

16:                                               ; preds = %10
  %17 = load i32, ptr %1, align 4, !tbaa !5
  %18 = add nsw i32 %17, 1
  store i32 %18, ptr %1, align 4, !tbaa !5
  br label %2, !llvm.loop !11

19:                                               ; preds = %9
  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: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5arrayIlLm1000005EEixEm(ptr noundef nonnull align 8 dereferenceable(8000040), i64 noundef) #0 align 2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

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 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long", !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"

%"struct.std::array" = type { [1000005 x i64] }

@parent = external dso_local global %"struct.std::array", align 8
@node = external dso_local local_unnamed_addr global i64, align 8
@edge = external dso_local local_unnamed_addr global i64, align 8

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z7initialv() local_unnamed_addr #0 {
  %1 = load i64, ptr @node, align 8, !tbaa !5
  %2 = load i64, ptr @edge, align 8, !tbaa !5
  %3 = add nsw i64 %2, %1
  %4 = icmp sgt i64 %3, 0
  br i1 %4, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph, %0
  ret void

.lr.ph:                                           ; preds = %0, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %0 ]
  %5 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5arrayIlLm1000005EEixEm(ptr noundef nonnull align 8 dereferenceable(8000040) @parent, i64 noundef %indvars.iv) #1
  store i64 %indvars.iv, ptr %5, align 8, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %6 = load i64, ptr @node, align 8, !tbaa !5
  %7 = load i64, ptr @edge, align 8, !tbaa !5
  %8 = add nsw i64 %7, %6
  %9 = icmp sgt i64 %8, %indvars.iv.next
  br i1 %9, label %.lr.ph, label %._crit_edge, !llvm.loop !9
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5arrayIlLm1000005EEixEm(ptr noundef nonnull align 8 dereferenceable(8000040), i64 noundef) local_unnamed_addr #0 align 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 = { 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++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass