; LLVM IR from m-boutaleb/LZS :: src (utils)

; 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: nounwind uwtable
define dso_local void @copy_string(ptr noundef %0, ptr noundef %1, i16 noundef zeroext %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i16, align 2
  %7 = alloca i16, align 2
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i16 %2, ptr %6, align 2, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 2, ptr %7) #2
  store i16 0, ptr %7, align 2, !tbaa !9
  br label %8

8:                                                ; preds = %25, %3
  %9 = load i16, ptr %7, align 2, !tbaa !9
  %10 = zext i16 %9 to i32
  %11 = load i16, ptr %6, align 2, !tbaa !9
  %12 = zext i16 %11 to i32
  %13 = sub nsw i32 %12, 1
  %14 = icmp slt i32 %10, %13
  br i1 %14, label %15, label %28

15:                                               ; preds = %8
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  %17 = load i16, ptr %7, align 2, !tbaa !9
  %18 = zext i16 %17 to i64
  %19 = getelementptr inbounds i8, ptr %16, i64 %18
  %20 = load i8, ptr %19, align 1, !tbaa !11
  %21 = load ptr, ptr %4, align 8, !tbaa !5
  %22 = load i16, ptr %7, align 2, !tbaa !9
  %23 = zext i16 %22 to i64
  %24 = getelementptr inbounds i8, ptr %21, i64 %23
  store i8 %20, ptr %24, align 1, !tbaa !11
  br label %25

25:                                               ; preds = %15
  %26 = load i16, ptr %7, align 2, !tbaa !9
  %27 = add i16 %26, 1
  store i16 %27, ptr %7, align 2, !tbaa !9
  br label %8, !llvm.loop !12

28:                                               ; preds = %8
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = load i16, ptr %7, align 2, !tbaa !9
  %31 = zext i16 %30 to i64
  %32 = getelementptr inbounds i8, ptr %29, i64 %31
  store i8 0, ptr %32, align 1, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 2, ptr %7) #2
  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 = { 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"short", !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(argmem: readwrite) uwtable
define dso_local void @copy_string(ptr nocapture noundef writeonly %0, ptr nocapture noundef readonly %1, i16 noundef zeroext %2) local_unnamed_addr #0 {
  %4 = icmp ugt i16 %2, 1
  br i1 %4, label %iter.check, label %._crit_edge

iter.check:                                       ; preds = %3
  %5 = ptrtoint ptr %0 to i64
  %6 = ptrtoint ptr %1 to i64
  %7 = zext i16 %2 to i64
  %8 = add nuw nsw i64 %7, 4294967295
  %wide.trip.count = and i64 %8, 4294967295
  %min.iters.check = icmp ult i64 %wide.trip.count, 8
  %9 = sub i64 %5, %6
  %diff.check = icmp ult i64 %9, 32
  %or.cond = or i1 %min.iters.check, %diff.check
  br i1 %or.cond, label %.lr.ph.preheader, label %vector.main.loop.iter.check

vector.main.loop.iter.check:                      ; preds = %iter.check
  %min.iters.check10 = icmp ult i64 %wide.trip.count, 32
  br i1 %min.iters.check10, label %vec.epilog.ph, label %vector.ph

vector.ph:                                        ; preds = %vector.main.loop.iter.check
  %n.mod.vf = and i64 %8, 31
  %n.vec = sub nsw i64 %wide.trip.count, %n.mod.vf
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %10 = getelementptr inbounds i8, ptr %1, i64 %index
  %11 = getelementptr inbounds i8, ptr %10, i64 16
  %wide.load = load <16 x i8>, ptr %10, align 1, !tbaa !5
  %wide.load11 = load <16 x i8>, ptr %11, align 1, !tbaa !5
  %12 = getelementptr inbounds i8, ptr %0, i64 %index
  %13 = getelementptr inbounds i8, ptr %12, i64 16
  store <16 x i8> %wide.load, ptr %12, align 1, !tbaa !5
  store <16 x i8> %wide.load11, ptr %13, align 1, !tbaa !5
  %index.next = add nuw i64 %index, 32
  %14 = icmp eq i64 %index.next, %n.vec
  br i1 %14, label %middle.block, label %vector.body, !llvm.loop !8

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.mod.vf, 0
  br i1 %cmp.n, label %._crit_edge.loopexit, label %vec.epilog.iter.check

vec.epilog.iter.check:                            ; preds = %middle.block
  %min.epilog.iters.check = icmp ult i64 %n.mod.vf, 8
  br i1 %min.epilog.iters.check, label %.lr.ph.preheader, label %vec.epilog.ph

vec.epilog.ph:                                    ; preds = %vector.main.loop.iter.check, %vec.epilog.iter.check
  %vec.epilog.resume.val = phi i64 [ %n.vec, %vec.epilog.iter.check ], [ 0, %vector.main.loop.iter.check ]
  %n.mod.vf12 = and i64 %8, 7
  %n.vec13 = sub nsw i64 %wide.trip.count, %n.mod.vf12
  br label %vec.epilog.vector.body

vec.epilog.vector.body:                           ; preds = %vec.epilog.vector.body, %vec.epilog.ph
  %index14 = phi i64 [ %vec.epilog.resume.val, %vec.epilog.ph ], [ %index.next16, %vec.epilog.vector.body ]
  %15 = getelementptr inbounds i8, ptr %1, i64 %index14
  %wide.load15 = load <8 x i8>, ptr %15, align 1, !tbaa !5
  %16 = getelementptr inbounds i8, ptr %0, i64 %index14
  store <8 x i8> %wide.load15, ptr %16, align 1, !tbaa !5
  %index.next16 = add nuw i64 %index14, 8
  %17 = icmp eq i64 %index.next16, %n.vec13
  br i1 %17, label %vec.epilog.middle.block, label %vec.epilog.vector.body, !llvm.loop !12

vec.epilog.middle.block:                          ; preds = %vec.epilog.vector.body
  %cmp.n17 = icmp eq i64 %n.mod.vf12, 0
  br i1 %cmp.n17, label %._crit_edge.loopexit, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %vec.epilog.middle.block, %iter.check, %vec.epilog.iter.check
  %indvars.iv.ph = phi i64 [ 0, %iter.check ], [ %n.vec, %vec.epilog.iter.check ], [ %n.vec13, %vec.epilog.middle.block ]
  %18 = sub nsw i64 %8, %indvars.iv.ph
  %xtraiter = and i64 %18, 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.preheader, %.lr.ph.prol
  %indvars.iv.prol = phi i64 [ %indvars.iv.next.prol, %.lr.ph.prol ], [ %indvars.iv.ph, %.lr.ph.preheader ]
  %prol.iter = phi i64 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader ]
  %19 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv.prol
  %20 = load i8, ptr %19, align 1, !tbaa !5
  %21 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.prol
  store i8 %20, ptr %21, align 1, !tbaa !5
  %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 !13

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader
  %indvars.iv.unr = phi i64 [ %indvars.iv.ph, %.lr.ph.preheader ], [ %indvars.iv.next.prol, %.lr.ph.prol ]
  %22 = sub nsw i64 %indvars.iv.ph, %wide.trip.count
  %23 = icmp ugt i64 %22, -4
  br i1 %23, label %._crit_edge.loopexit, label %.lr.ph

.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 ]
  %24 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv
  %25 = load i8, ptr %24, align 1, !tbaa !5
  %26 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv
  store i8 %25, ptr %26, align 1, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %27 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv.next
  %28 = load i8, ptr %27, align 1, !tbaa !5
  %29 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next
  store i8 %28, ptr %29, align 1, !tbaa !5
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %30 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv.next.1
  %31 = load i8, ptr %30, align 1, !tbaa !5
  %32 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next.1
  store i8 %31, ptr %32, align 1, !tbaa !5
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %33 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv.next.2
  %34 = load i8, ptr %33, align 1, !tbaa !5
  %35 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next.2
  store i8 %34, ptr %35, align 1, !tbaa !5
  %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.loopexit, label %.lr.ph, !llvm.loop !15

._crit_edge.loopexit:                             ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %vec.epilog.middle.block, %middle.block
  %36 = and i64 %8, 65535
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %3
  %.0.lcssa = phi i64 [ 0, %3 ], [ %36, %._crit_edge.loopexit ]
  %37 = getelementptr inbounds i8, ptr %0, i64 %.0.lcssa
  store i8 0, ptr %37, align 1, !tbaa !5
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: readwrite) 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9, !10, !11}
!9 = !{!"llvm.loop.mustprogress"}
!10 = !{!"llvm.loop.isvectorized", i32 1}
!11 = !{!"llvm.loop.unroll.runtime.disable"}
!12 = distinct !{!12, !9, !10, !11}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.unroll.disable"}
!15 = distinct !{!15, !9, !10}


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