; LLVM IR from tangjz/acm-icpc :: codeforces/complete/755F.ll (Z7bit_andPyS_)

; 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"

@sz = external dso_local global i32, align 4

; 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: mustprogress nounwind uwtable
define dso_local void @_Z7bit_andPyS_(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !9
  br label %6

6:                                                ; preds = %23, %2
  %7 = load i32, ptr %5, align 4, !tbaa !9
  %8 = load i32, ptr @sz, align 4, !tbaa !9
  %9 = icmp slt i32 %7, %8
  br i1 %9, label %11, label %10

10:                                               ; preds = %6
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  br label %26

11:                                               ; preds = %6
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  %13 = load i32, ptr %5, align 4, !tbaa !9
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds i64, ptr %12, i64 %14
  %16 = load i64, ptr %15, align 8, !tbaa !11
  %17 = load ptr, ptr %3, align 8, !tbaa !5
  %18 = load i32, ptr %5, align 4, !tbaa !9
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds i64, ptr %17, i64 %19
  %21 = load i64, ptr %20, align 8, !tbaa !11
  %22 = or i64 %21, %16
  store i64 %22, ptr %20, align 8, !tbaa !11
  br label %23

23:                                               ; preds = %11
  %24 = load i32, ptr %5, align 4, !tbaa !9
  %25 = add nsw i32 %24, 1
  store i32 %25, ptr %5, align 4, !tbaa !9
  br label %6, !llvm.loop !13

26:                                               ; preds = %10
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long long", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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"

@sz = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nofree norecurse nosync nounwind memory(read, argmem: readwrite, inaccessiblemem: none) uwtable
define dso_local void @_Z7bit_andPyS_(ptr nocapture noundef %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 {
  %3 = load i32, ptr @sz, align 4, !tbaa !5
  %4 = icmp sgt i32 %3, 0
  br i1 %4, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %wide.trip.count = zext nneg i32 %3 to i64
  %min.iters.check = icmp ult i32 %3, 8
  br i1 %min.iters.check, label %.lr.ph.preheader11, label %vector.memcheck

.lr.ph.preheader11:                               ; preds = %middle.block, %vector.memcheck, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 0, %vector.memcheck ], [ 0, %.lr.ph.preheader ], [ %n.vec, %middle.block ]
  %xtraiter = and i64 %wide.trip.count, 3
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol

.lr.ph.prol:                                      ; preds = %.lr.ph.preheader11, %.lr.ph.prol
  %indvars.iv.prol = phi i64 [ %indvars.iv.next.prol, %.lr.ph.prol ], [ %indvars.iv.ph, %.lr.ph.preheader11 ]
  %prol.iter = phi i64 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader11 ]
  %5 = getelementptr inbounds i64, ptr %1, i64 %indvars.iv.prol
  %6 = load i64, ptr %5, align 8, !tbaa !9
  %7 = getelementptr inbounds i64, ptr %0, i64 %indvars.iv.prol
  %8 = load i64, ptr %7, align 8, !tbaa !9
  %9 = or i64 %8, %6
  store i64 %9, ptr %7, align 8, !tbaa !9
  %indvars.iv.next.prol = add nuw nsw i64 %indvars.iv.prol, 1
  %prol.iter.next = add i64 %prol.iter, 1
  %prol.iter.cmp.not = icmp eq i64 %prol.iter.next, %xtraiter
  br i1 %prol.iter.cmp.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol, !llvm.loop !11

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader11
  %indvars.iv.unr = phi i64 [ %indvars.iv.ph, %.lr.ph.preheader11 ], [ %indvars.iv.next.prol, %.lr.ph.prol ]
  %10 = sub nsw i64 %indvars.iv.ph, %wide.trip.count
  %11 = icmp ugt i64 %10, -4
  br i1 %11, label %._crit_edge, label %.lr.ph

vector.memcheck:                                  ; preds = %.lr.ph.preheader
  %12 = shl nuw nsw i64 %wide.trip.count, 3
  %scevgep = getelementptr i8, ptr %0, i64 %12
  %scevgep7 = getelementptr i8, ptr %1, i64 %12
  %bound0 = icmp ugt ptr %scevgep7, %0
  %bound1 = icmp ugt ptr %scevgep, %1
  %found.conflict = and i1 %bound0, %bound1
  br i1 %found.conflict, label %.lr.ph.preheader11, label %vector.ph

vector.ph:                                        ; preds = %vector.memcheck
  %n.vec = and i64 %wide.trip.count, 2147483644
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %13 = getelementptr inbounds i64, ptr %1, i64 %index
  %14 = getelementptr inbounds i8, ptr %13, i64 16
  %wide.load = load <2 x i64>, ptr %13, align 8, !tbaa !9, !alias.scope !13
  %wide.load8 = load <2 x i64>, ptr %14, align 8, !tbaa !9, !alias.scope !13
  %15 = getelementptr inbounds i64, ptr %0, i64 %index
  %16 = getelementptr inbounds i8, ptr %15, i64 16
  %wide.load9 = load <2 x i64>, ptr %15, align 8, !tbaa !9, !alias.scope !16, !noalias !13
  %wide.load10 = load <2 x i64>, ptr %16, align 8, !tbaa !9, !alias.scope !16, !noalias !13
  %17 = or <2 x i64> %wide.load9, %wide.load
  %18 = or <2 x i64> %wide.load10, %wide.load8
  store <2 x i64> %17, ptr %15, align 8, !tbaa !9, !alias.scope !16, !noalias !13
  store <2 x i64> %18, ptr %16, align 8, !tbaa !9, !alias.scope !16, !noalias !13
  %index.next = add nuw i64 %index, 4
  %19 = icmp eq i64 %index.next, %n.vec
  br i1 %19, label %middle.block, label %vector.body, !llvm.loop !18

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader11

._crit_edge:                                      ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %middle.block, %2
  ret void

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next.3, %.lr.ph ], [ %indvars.iv.unr, %.lr.ph.prol.loopexit ]
  %20 = getelementptr inbounds i64, ptr %1, i64 %indvars.iv
  %21 = load i64, ptr %20, align 8, !tbaa !9
  %22 = getelementptr inbounds i64, ptr %0, i64 %indvars.iv
  %23 = load i64, ptr %22, align 8, !tbaa !9
  %24 = or i64 %23, %21
  store i64 %24, ptr %22, align 8, !tbaa !9
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %25 = getelementptr inbounds i64, ptr %1, i64 %indvars.iv.next
  %26 = load i64, ptr %25, align 8, !tbaa !9
  %27 = getelementptr inbounds i64, ptr %0, i64 %indvars.iv.next
  %28 = load i64, ptr %27, align 8, !tbaa !9
  %29 = or i64 %28, %26
  store i64 %29, ptr %27, align 8, !tbaa !9
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %30 = getelementptr inbounds i64, ptr %1, i64 %indvars.iv.next.1
  %31 = load i64, ptr %30, align 8, !tbaa !9
  %32 = getelementptr inbounds i64, ptr %0, i64 %indvars.iv.next.1
  %33 = load i64, ptr %32, align 8, !tbaa !9
  %34 = or i64 %33, %31
  store i64 %34, ptr %32, align 8, !tbaa !9
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %35 = getelementptr inbounds i64, ptr %1, i64 %indvars.iv.next.2
  %36 = load i64, ptr %35, align 8, !tbaa !9
  %37 = getelementptr inbounds i64, ptr %0, i64 %indvars.iv.next.2
  %38 = load i64, ptr %37, align 8, !tbaa !9
  %39 = or i64 %38, %36
  store i64 %39, ptr %37, align 8, !tbaa !9
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 4
  %exitcond.not.3 = icmp eq i64 %indvars.iv.next.3, %wide.trip.count
  br i1 %exitcond.not.3, label %._crit_edge, label %.lr.ph, !llvm.loop !22
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(read, argmem: readwrite, 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 = !{!10, !10, i64 0}
!10 = !{!"long long", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.unroll.disable"}
!13 = !{!14}
!14 = distinct !{!14, !15}
!15 = distinct !{!15, !"LVerDomain"}
!16 = !{!17}
!17 = distinct !{!17, !15}
!18 = distinct !{!18, !19, !20, !21}
!19 = !{!"llvm.loop.mustprogress"}
!20 = !{!"llvm.loop.isvectorized", i32 1}
!21 = !{!"llvm.loop.unroll.runtime.disable"}
!22 = distinct !{!22, !19, !20}


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