; LLVM IR from lzyrapx/Competitive-Programming :: ACdream/1062（递推推结论）.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"

@a = external dso_local global [50000 x i64], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z4initv() #0 {
  %1 = alloca i32, align 4
  store i64 1, ptr @a, align 16, !tbaa !5
  store i64 2, ptr getelementptr inbounds ([50000 x i64], ptr @a, i64 0, i64 1), align 8, !tbaa !5
  store i64 4, ptr getelementptr inbounds ([50000 x i64], ptr @a, i64 0, i64 2), align 16, !tbaa !5
  store i64 8, ptr getelementptr inbounds ([50000 x i64], ptr @a, i64 0, i64 3), align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #2
  store i32 1, ptr %1, align 4, !tbaa !9
  br label %2

2:                                                ; preds = %17, %0
  %3 = load i32, ptr %1, align 4, !tbaa !9
  %4 = icmp slt i32 %3, 50000
  br i1 %4, label %6, label %5

5:                                                ; preds = %2
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #2
  br label %20

6:                                                ; preds = %2
  %7 = load i32, ptr %1, align 4, !tbaa !9
  %8 = load i32, ptr %1, align 4, !tbaa !9
  %9 = mul nsw i32 %7, %8
  %10 = load i32, ptr %1, align 4, !tbaa !9
  %11 = sub nsw i32 %9, %10
  %12 = add nsw i32 %11, 2
  %13 = sext i32 %12 to i64
  %14 = load i32, ptr %1, align 4, !tbaa !9
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [50000 x i64], ptr @a, i64 0, i64 %15
  store i64 %13, ptr %16, align 8, !tbaa !5
  br label %17

17:                                               ; preds = %6
  %18 = load i32, ptr %1, align 4, !tbaa !9
  %19 = add nsw i32 %18, 1
  store i32 %19, ptr %1, align 4, !tbaa !9
  br label %2, !llvm.loop !11

20:                                               ; preds = %5
  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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !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"

@a = external dso_local local_unnamed_addr global [50000 x i64], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind memory(write, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z4initv() local_unnamed_addr #0 {
vector.ph:
  store i64 1, ptr @a, align 16, !tbaa !5
  store i64 2, ptr getelementptr inbounds (i8, ptr @a, i64 8), align 8, !tbaa !5
  store i64 4, ptr getelementptr inbounds (i8, ptr @a, i64 16), align 16, !tbaa !5
  store i64 8, ptr getelementptr inbounds (i8, ptr @a, i64 24), align 8, !tbaa !5
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.ind = phi <2 x i64> [ <i64 1, i64 2>, %vector.ph ], [ %vec.ind.next, %vector.body ]
  %step.add = add <2 x i64> %vec.ind, <i64 2, i64 2>
  %offset.idx = or disjoint i64 %index, 1
  %0 = add nuw <2 x i64> %vec.ind, <i64 4294967295, i64 4294967295>
  %1 = add <2 x i64> %vec.ind, <i64 1, i64 1>
  %2 = mul <2 x i64> %0, %vec.ind
  %3 = mul <2 x i64> %1, %step.add
  %4 = shl <2 x i64> %2, <i64 32, i64 32>
  %5 = shl <2 x i64> %3, <i64 32, i64 32>
  %6 = add <2 x i64> %4, <i64 8589934592, i64 8589934592>
  %7 = add <2 x i64> %5, <i64 8589934592, i64 8589934592>
  %8 = ashr exact <2 x i64> %6, <i64 32, i64 32>
  %9 = ashr exact <2 x i64> %7, <i64 32, i64 32>
  %10 = getelementptr inbounds [50000 x i64], ptr @a, i64 0, i64 %offset.idx
  %11 = getelementptr inbounds i8, ptr %10, i64 16
  store <2 x i64> %8, ptr %10, align 8, !tbaa !5
  store <2 x i64> %9, ptr %11, align 8, !tbaa !5
  %index.next = add nuw i64 %index, 4
  %vec.ind.next = add <2 x i64> %vec.ind, <i64 4, i64 4>
  %12 = icmp eq i64 %index.next, 49996
  br i1 %12, label %scalar.ph, label %vector.body, !llvm.loop !9

scalar.ph:                                        ; preds = %vector.body
  store i64 -1795317282, ptr getelementptr inbounds (i8, ptr @a, i64 399976), align 8, !tbaa !5
  store i64 -1795217288, ptr getelementptr inbounds (i8, ptr @a, i64 399984), align 16, !tbaa !5
  store i64 -1795117292, ptr getelementptr inbounds (i8, ptr @a, i64 399992), align 8, !tbaa !5
  ret void
}

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 = !{!"long long", !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"}


; Effective O3 passes: GVNPass,GlobalOptPass,IndVarSimplifyPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,LoopLoadEliminationPass,LoopRotatePass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass