; LLVM IR from QiaoLiuHit/LSOTB-TIR :: vlfeat-0.9.19/vl (stringop)

; 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 i64 @vl_string_copy(ptr noundef %0, i64 noundef %1, ptr noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca i64, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i8, align 1
  %8 = alloca i64, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i64 %1, ptr %5, align 8, !tbaa !9
  store ptr %2, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 1, ptr %7) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  store i64 0, ptr %8, align 8, !tbaa !9
  br label %9

9:                                                ; preds = %27, %3
  %10 = load ptr, ptr %6, align 8, !tbaa !5
  %11 = getelementptr inbounds i8, ptr %10, i32 1
  store ptr %11, ptr %6, align 8, !tbaa !5
  %12 = load i8, ptr %10, align 1, !tbaa !11
  store i8 %12, ptr %7, align 1, !tbaa !11
  %13 = icmp ne i8 %12, 0
  br i1 %13, label %14, label %30

14:                                               ; preds = %9
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = icmp ne ptr %15, null
  br i1 %16, label %17, label %27

17:                                               ; preds = %14
  %18 = load i64, ptr %8, align 8, !tbaa !9
  %19 = add i64 %18, 1
  %20 = load i64, ptr %5, align 8, !tbaa !9
  %21 = icmp ult i64 %19, %20
  br i1 %21, label %22, label %27

22:                                               ; preds = %17
  %23 = load i8, ptr %7, align 1, !tbaa !11
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = load i64, ptr %8, align 8, !tbaa !9
  %26 = getelementptr inbounds i8, ptr %24, i64 %25
  store i8 %23, ptr %26, align 1, !tbaa !11
  br label %27

27:                                               ; preds = %22, %17, %14
  %28 = load i64, ptr %8, align 8, !tbaa !9
  %29 = add i64 %28, 1
  store i64 %29, ptr %8, align 8, !tbaa !9
  br label %9, !llvm.loop !12

30:                                               ; preds = %9
  %31 = load i64, ptr %5, align 8, !tbaa !9
  %32 = icmp ugt i64 %31, 0
  br i1 %32, label %33, label %47

33:                                               ; preds = %30
  %34 = load ptr, ptr %4, align 8, !tbaa !5
  %35 = load i64, ptr %8, align 8, !tbaa !9
  %36 = load i64, ptr %5, align 8, !tbaa !9
  %37 = sub i64 %36, 1
  %38 = icmp ult i64 %35, %37
  br i1 %38, label %39, label %41

39:                                               ; preds = %33
  %40 = load i64, ptr %8, align 8, !tbaa !9
  br label %44

41:                                               ; preds = %33
  %42 = load i64, ptr %5, align 8, !tbaa !9
  %43 = sub i64 %42, 1
  br label %44

44:                                               ; preds = %41, %39
  %45 = phi i64 [ %40, %39 ], [ %43, %41 ]
  %46 = getelementptr inbounds i8, ptr %34, i64 %45
  store i8 0, ptr %46, align 1, !tbaa !11
  br label %47

47:                                               ; preds = %44, %30
  %48 = load i64, ptr %8, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 1, ptr %7) #2
  ret i64 %48
}

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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long long", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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(read, argmem: readwrite, inaccessiblemem: none) uwtable
define dso_local i64 @vl_string_copy(ptr noundef writeonly %0, i64 noundef %1, ptr nocapture noundef readonly %2) local_unnamed_addr #0 {
  %4 = load i8, ptr %2, align 1, !tbaa !5
  %.not21 = icmp eq i8 %4, 0
  br i1 %.not21, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %3
  %5 = getelementptr inbounds i8, ptr %2, i64 1
  %.not19.not = icmp eq ptr %0, null
  br i1 %.not19.not, label %.lr.ph.split.us, label %.lr.ph.split

.lr.ph.split.us:                                  ; preds = %.lr.ph, %.lr.ph.split.us
  %6 = phi ptr [ %8, %.lr.ph.split.us ], [ %5, %.lr.ph ]
  %.022.us = phi i64 [ %7, %.lr.ph.split.us ], [ 0, %.lr.ph ]
  %7 = add i64 %.022.us, 1
  %8 = getelementptr inbounds i8, ptr %6, i64 1
  %9 = load i8, ptr %6, align 1, !tbaa !5
  %.not.us = icmp eq i8 %9, 0
  br i1 %.not.us, label %._crit_edge, label %.lr.ph.split.us, !llvm.loop !8

.lr.ph.split:                                     ; preds = %.lr.ph, %16
  %10 = phi i8 [ %18, %16 ], [ %4, %.lr.ph ]
  %11 = phi ptr [ %17, %16 ], [ %5, %.lr.ph ]
  %.022 = phi i64 [ %12, %16 ], [ 0, %.lr.ph ]
  %12 = add i64 %.022, 1
  %13 = icmp ult i64 %12, %1
  br i1 %13, label %14, label %16

14:                                               ; preds = %.lr.ph.split
  %15 = getelementptr inbounds i8, ptr %0, i64 %.022
  store i8 %10, ptr %15, align 1, !tbaa !5
  br label %16

16:                                               ; preds = %14, %.lr.ph.split
  %17 = getelementptr inbounds i8, ptr %11, i64 1
  %18 = load i8, ptr %11, align 1, !tbaa !5
  %.not = icmp eq i8 %18, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph.split, !llvm.loop !8

._crit_edge:                                      ; preds = %16, %.lr.ph.split.us, %3
  %.0.lcssa = phi i64 [ 0, %3 ], [ %7, %.lr.ph.split.us ], [ %12, %16 ]
  %.not18 = icmp eq i64 %1, 0
  br i1 %.not18, label %23, label %19

19:                                               ; preds = %._crit_edge
  %20 = add i64 %1, -1
  %21 = tail call i64 @llvm.umin.i64(i64 %.0.lcssa, i64 %20)
  %22 = getelementptr inbounds i8, ptr %0, i64 %21
  store i8 0, ptr %22, align 1, !tbaa !5
  br label %23

23:                                               ; preds = %19, %._crit_edge
  ret i64 %.0.lcssa
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.umin.i64(i64, i64) #1

attributes #0 = { 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" }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopInstSimplifyPass,LoopRotatePass,LoopSimplifyCFGPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass