; LLVM IR from JessonYue/LeetCodeLearning :: Array/huyang/0713 (mycstring)

; 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 ptr @mymemcpy(ptr noundef %0, ptr noundef %1, i32 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  %9 = alloca ptr, align 8
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i32 %2, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %10 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %10, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #2
  %11 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %11, ptr %9, align 8, !tbaa !5
  br label %12

12:                                               ; preds = %15, %3
  %13 = load i32, ptr %7, align 4, !tbaa !9
  %14 = icmp ne i32 %13, 0
  br i1 %14, label %15, label %25

15:                                               ; preds = %12
  %16 = load ptr, ptr %9, align 8, !tbaa !5
  %17 = load i8, ptr %16, align 1, !tbaa !11
  %18 = load ptr, ptr %8, align 8, !tbaa !5
  store i8 %17, ptr %18, align 1, !tbaa !11
  %19 = load ptr, ptr %8, align 8, !tbaa !5
  %20 = getelementptr inbounds i8, ptr %19, i32 1
  store ptr %20, ptr %8, align 8, !tbaa !5
  %21 = load ptr, ptr %9, align 8, !tbaa !5
  %22 = getelementptr inbounds i8, ptr %21, i32 1
  store ptr %22, ptr %9, align 8, !tbaa !5
  %23 = load i32, ptr %7, align 4, !tbaa !9
  %24 = add nsw i32 %23, -1
  store i32 %24, ptr %7, align 4, !tbaa !9
  br label %12, !llvm.loop !12

25:                                               ; preds = %12
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  %26 = load ptr, ptr %4, align 8
  ret ptr %26
}

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 = !{!"int", !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(readwrite, inaccessiblemem: none) uwtable
define dso_local noalias ptr @mymemcpy(ptr nocapture noundef writeonly %0, ptr nocapture noundef readonly %1, i32 noundef %2) local_unnamed_addr #0 {
  %.not10 = icmp eq i32 %2, 0
  br i1 %.not10, label %._crit_edge, label %iter.check

iter.check:                                       ; preds = %3
  %4 = ptrtoint ptr %0 to i64
  %5 = ptrtoint ptr %1 to i64
  %6 = zext i32 %2 to i64
  %min.iters.check = icmp ult i32 %2, 8
  %7 = sub i64 %4, %5
  %diff.check = icmp ult i64 %7, 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.check14 = icmp ult i32 %2, 32
  br i1 %min.iters.check14, label %vec.epilog.ph, label %vector.ph

vector.ph:                                        ; preds = %vector.main.loop.iter.check
  %n.vec = and i64 %6, 4294967264
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %next.gep = getelementptr i8, ptr %1, i64 %index
  %next.gep16 = getelementptr i8, ptr %0, i64 %index
  %8 = getelementptr i8, ptr %next.gep, i64 16
  %wide.load = load <16 x i8>, ptr %next.gep, align 1, !tbaa !5
  %wide.load18 = load <16 x i8>, ptr %8, align 1, !tbaa !5
  %9 = getelementptr i8, ptr %next.gep16, i64 16
  store <16 x i8> %wide.load, ptr %next.gep16, align 1, !tbaa !5
  store <16 x i8> %wide.load18, ptr %9, align 1, !tbaa !5
  %index.next = add nuw i64 %index, 32
  %10 = icmp eq i64 %index.next, %n.vec
  br i1 %10, label %middle.block, label %vector.body, !llvm.loop !8

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %6
  br i1 %cmp.n, label %._crit_edge, label %vec.epilog.iter.check

vec.epilog.iter.check:                            ; preds = %middle.block
  %.cast26 = trunc nuw i64 %n.vec to i32
  %ind.end27 = sub i32 %2, %.cast26
  %ind.end23 = getelementptr i8, ptr %0, i64 %n.vec
  %ind.end21 = getelementptr i8, ptr %1, i64 %n.vec
  %n.vec.remaining = and i64 %6, 24
  %min.epilog.iters.check = icmp eq i64 %n.vec.remaining, 0
  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.vec20 = and i64 %6, 4294967288
  %ind.end = getelementptr i8, ptr %1, i64 %n.vec20
  %ind.end22 = getelementptr i8, ptr %0, i64 %n.vec20
  %.cast = trunc nuw i64 %n.vec20 to i32
  %ind.end25 = sub i32 %2, %.cast
  br label %vec.epilog.vector.body

vec.epilog.vector.body:                           ; preds = %vec.epilog.vector.body, %vec.epilog.ph
  %index29 = phi i64 [ %vec.epilog.resume.val, %vec.epilog.ph ], [ %index.next33, %vec.epilog.vector.body ]
  %next.gep30 = getelementptr i8, ptr %1, i64 %index29
  %next.gep31 = getelementptr i8, ptr %0, i64 %index29
  %wide.load32 = load <8 x i8>, ptr %next.gep30, align 1, !tbaa !5
  store <8 x i8> %wide.load32, ptr %next.gep31, align 1, !tbaa !5
  %index.next33 = add nuw i64 %index29, 8
  %11 = icmp eq i64 %index.next33, %n.vec20
  br i1 %11, label %vec.epilog.middle.block, label %vec.epilog.vector.body, !llvm.loop !12

vec.epilog.middle.block:                          ; preds = %vec.epilog.vector.body
  %cmp.n34 = icmp eq i64 %n.vec20, %6
  br i1 %cmp.n34, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %vec.epilog.middle.block, %iter.check, %vec.epilog.iter.check
  %.013.ph = phi ptr [ %1, %iter.check ], [ %ind.end21, %vec.epilog.iter.check ], [ %ind.end, %vec.epilog.middle.block ]
  %.0812.ph = phi ptr [ %0, %iter.check ], [ %ind.end23, %vec.epilog.iter.check ], [ %ind.end22, %vec.epilog.middle.block ]
  %.0911.ph = phi i32 [ %2, %iter.check ], [ %ind.end27, %vec.epilog.iter.check ], [ %ind.end25, %vec.epilog.middle.block ]
  %12 = add nsw i32 %.0911.ph, -1
  %xtraiter = and i32 %.0911.ph, 7
  %lcmp.mod.not = icmp eq i32 %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
  %.013.prol = phi ptr [ %15, %.lr.ph.prol ], [ %.013.ph, %.lr.ph.preheader ]
  %.0812.prol = phi ptr [ %14, %.lr.ph.prol ], [ %.0812.ph, %.lr.ph.preheader ]
  %.0911.prol = phi i32 [ %16, %.lr.ph.prol ], [ %.0911.ph, %.lr.ph.preheader ]
  %prol.iter = phi i32 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader ]
  %13 = load i8, ptr %.013.prol, align 1, !tbaa !5
  store i8 %13, ptr %.0812.prol, align 1, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %.0812.prol, i64 1
  %15 = getelementptr inbounds i8, ptr %.013.prol, i64 1
  %16 = add nsw i32 %.0911.prol, -1
  %prol.iter.next = add i32 %prol.iter, 1
  %prol.iter.cmp.not = icmp eq i32 %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
  %.013.unr = phi ptr [ %.013.ph, %.lr.ph.preheader ], [ %15, %.lr.ph.prol ]
  %.0812.unr = phi ptr [ %.0812.ph, %.lr.ph.preheader ], [ %14, %.lr.ph.prol ]
  %.0911.unr = phi i32 [ %.0911.ph, %.lr.ph.preheader ], [ %16, %.lr.ph.prol ]
  %17 = icmp ult i32 %12, 7
  br i1 %17, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %.013 = phi ptr [ %41, %.lr.ph ], [ %.013.unr, %.lr.ph.prol.loopexit ]
  %.0812 = phi ptr [ %40, %.lr.ph ], [ %.0812.unr, %.lr.ph.prol.loopexit ]
  %.0911 = phi i32 [ %42, %.lr.ph ], [ %.0911.unr, %.lr.ph.prol.loopexit ]
  %18 = load i8, ptr %.013, align 1, !tbaa !5
  store i8 %18, ptr %.0812, align 1, !tbaa !5
  %19 = getelementptr inbounds i8, ptr %.0812, i64 1
  %20 = getelementptr inbounds i8, ptr %.013, i64 1
  %21 = load i8, ptr %20, align 1, !tbaa !5
  store i8 %21, ptr %19, align 1, !tbaa !5
  %22 = getelementptr inbounds i8, ptr %.0812, i64 2
  %23 = getelementptr inbounds i8, ptr %.013, i64 2
  %24 = load i8, ptr %23, align 1, !tbaa !5
  store i8 %24, ptr %22, align 1, !tbaa !5
  %25 = getelementptr inbounds i8, ptr %.0812, i64 3
  %26 = getelementptr inbounds i8, ptr %.013, i64 3
  %27 = load i8, ptr %26, align 1, !tbaa !5
  store i8 %27, ptr %25, align 1, !tbaa !5
  %28 = getelementptr inbounds i8, ptr %.0812, i64 4
  %29 = getelementptr inbounds i8, ptr %.013, i64 4
  %30 = load i8, ptr %29, align 1, !tbaa !5
  store i8 %30, ptr %28, align 1, !tbaa !5
  %31 = getelementptr inbounds i8, ptr %.0812, i64 5
  %32 = getelementptr inbounds i8, ptr %.013, i64 5
  %33 = load i8, ptr %32, align 1, !tbaa !5
  store i8 %33, ptr %31, align 1, !tbaa !5
  %34 = getelementptr inbounds i8, ptr %.0812, i64 6
  %35 = getelementptr inbounds i8, ptr %.013, i64 6
  %36 = load i8, ptr %35, align 1, !tbaa !5
  store i8 %36, ptr %34, align 1, !tbaa !5
  %37 = getelementptr inbounds i8, ptr %.0812, i64 7
  %38 = getelementptr inbounds i8, ptr %.013, i64 7
  %39 = load i8, ptr %38, align 1, !tbaa !5
  store i8 %39, ptr %37, align 1, !tbaa !5
  %40 = getelementptr inbounds i8, ptr %.0812, i64 8
  %41 = getelementptr inbounds i8, ptr %.013, i64 8
  %42 = add nsw i32 %.0911, -8
  %.not.7 = icmp eq i32 %42, 0
  br i1 %.not.7, label %._crit_edge, label %.lr.ph, !llvm.loop !15

._crit_edge:                                      ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %middle.block, %vec.epilog.middle.block, %3
  ret ptr undef
}

attributes #0 = { nofree norecurse nosync nounwind memory(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 = !{!"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: GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass