; LLVM IR from ippeb/ACM-ICPC :: graph_theory/floyd_warshall/floyd_warshall.ll (Z4initv)

; 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"

@weight = external dso_local global [1001 x [1001 x i32]], align 16
@nvertices = external dso_local global i32, align 4

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z4initv() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  store i32 0, ptr @nvertices, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #2
  store i32 0, ptr %1, align 4, !tbaa !5
  br label %4

4:                                                ; preds = %24, %0
  %5 = load i32, ptr %1, align 4, !tbaa !5
  %6 = icmp slt i32 %5, 1001
  br i1 %6, label %8, label %7

7:                                                ; preds = %4
  store i32 2, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #2
  br label %27

8:                                                ; preds = %4
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 0, ptr %3, align 4, !tbaa !5
  br label %9

9:                                                ; preds = %20, %8
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = icmp slt i32 %10, 1001
  br i1 %11, label %13, label %12

12:                                               ; preds = %9
  store i32 5, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  br label %23

13:                                               ; preds = %9
  %14 = load i32, ptr %1, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [1001 x [1001 x i32]], ptr @weight, i64 0, i64 %15
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds [1001 x i32], ptr %16, i64 0, i64 %18
  store i32 1000000000, ptr %19, align 4, !tbaa !5
  br label %20

20:                                               ; preds = %13
  %21 = load i32, ptr %3, align 4, !tbaa !5
  %22 = add nsw i32 %21, 1
  store i32 %22, ptr %3, align 4, !tbaa !5
  br label %9, !llvm.loop !9

23:                                               ; preds = %12
  br label %24

24:                                               ; preds = %23
  %25 = load i32, ptr %1, align 4, !tbaa !5
  %26 = add nsw i32 %25, 1
  store i32 %26, ptr %1, align 4, !tbaa !5
  br label %4, !llvm.loop !11

27:                                               ; preds = %7
  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 = { 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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


; 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"

@weight = external dso_local local_unnamed_addr global [1001 x [1001 x i32]], align 16
@nvertices = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nofree norecurse nosync nounwind memory(write, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z4initv() local_unnamed_addr #0 {
  store i32 0, ptr @nvertices, align 4, !tbaa !5
  br label %vector.ph

vector.ph:                                        ; preds = %scalar.ph, %0
  %indvars.iv10 = phi i64 [ 0, %0 ], [ %indvars.iv.next11, %scalar.ph ]
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next.4, %vector.body ]
  %1 = getelementptr inbounds [1001 x [1001 x i32]], ptr @weight, i64 0, i64 %indvars.iv10, i64 %index
  %2 = getelementptr inbounds i8, ptr %1, i64 16
  store <4 x i32> <i32 1000000000, i32 1000000000, i32 1000000000, i32 1000000000>, ptr %1, align 4, !tbaa !5
  store <4 x i32> <i32 1000000000, i32 1000000000, i32 1000000000, i32 1000000000>, ptr %2, align 4, !tbaa !5
  %index.next = add nuw nsw i64 %index, 8
  %3 = getelementptr inbounds [1001 x [1001 x i32]], ptr @weight, i64 0, i64 %indvars.iv10, i64 %index.next
  %4 = getelementptr inbounds i8, ptr %3, i64 16
  store <4 x i32> <i32 1000000000, i32 1000000000, i32 1000000000, i32 1000000000>, ptr %3, align 4, !tbaa !5
  store <4 x i32> <i32 1000000000, i32 1000000000, i32 1000000000, i32 1000000000>, ptr %4, align 4, !tbaa !5
  %index.next.1 = add nuw nsw i64 %index, 16
  %5 = getelementptr inbounds [1001 x [1001 x i32]], ptr @weight, i64 0, i64 %indvars.iv10, i64 %index.next.1
  %6 = getelementptr inbounds i8, ptr %5, i64 16
  store <4 x i32> <i32 1000000000, i32 1000000000, i32 1000000000, i32 1000000000>, ptr %5, align 4, !tbaa !5
  store <4 x i32> <i32 1000000000, i32 1000000000, i32 1000000000, i32 1000000000>, ptr %6, align 4, !tbaa !5
  %index.next.2 = add nuw nsw i64 %index, 24
  %7 = getelementptr inbounds [1001 x [1001 x i32]], ptr @weight, i64 0, i64 %indvars.iv10, i64 %index.next.2
  %8 = getelementptr inbounds i8, ptr %7, i64 16
  store <4 x i32> <i32 1000000000, i32 1000000000, i32 1000000000, i32 1000000000>, ptr %7, align 4, !tbaa !5
  store <4 x i32> <i32 1000000000, i32 1000000000, i32 1000000000, i32 1000000000>, ptr %8, align 4, !tbaa !5
  %index.next.3 = add nuw nsw i64 %index, 32
  %9 = getelementptr inbounds [1001 x [1001 x i32]], ptr @weight, i64 0, i64 %indvars.iv10, i64 %index.next.3
  %10 = getelementptr inbounds i8, ptr %9, i64 16
  store <4 x i32> <i32 1000000000, i32 1000000000, i32 1000000000, i32 1000000000>, ptr %9, align 4, !tbaa !5
  store <4 x i32> <i32 1000000000, i32 1000000000, i32 1000000000, i32 1000000000>, ptr %10, align 4, !tbaa !5
  %index.next.4 = add nuw nsw i64 %index, 40
  %11 = icmp eq i64 %index.next.4, 1000
  br i1 %11, label %scalar.ph, label %vector.body, !llvm.loop !9

12:                                               ; preds = %scalar.ph
  ret void

scalar.ph:                                        ; preds = %vector.body
  %13 = getelementptr inbounds [1001 x [1001 x i32]], ptr @weight, i64 0, i64 %indvars.iv10, i64 1000
  store i32 1000000000, ptr %13, align 4, !tbaa !5
  %indvars.iv.next11 = add nuw nsw i64 %indvars.iv10, 1
  %exitcond13.not = icmp eq i64 %indvars.iv.next11, 1001
  br i1 %exitcond13.not, label %12, label %vector.ph, !llvm.loop !13
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(write, argmem: none, inaccessiblemem: none) 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++ 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}


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