; LLVM IR from JessonYue/LeetCodeLearning :: Array/caiweixiong/c (homework_str_test)

; 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: nounwind uwtable
define dso_local ptr @my_memcpy(ptr noundef %0, ptr noundef %1, i64 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i64, align 8
  %8 = alloca ptr, align 8
  %9 = alloca ptr, align 8
  %10 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i64 %2, ptr %7, align 8, !tbaa !9
  %11 = load ptr, ptr %6, align 8, !tbaa !5
  %12 = icmp ne ptr %11, null
  br i1 %12, label %13, label %19

13:                                               ; preds = %3
  %14 = load ptr, ptr %5, align 8, !tbaa !5
  %15 = icmp ne ptr %14, null
  br i1 %15, label %16, label %19

16:                                               ; preds = %13
  %17 = load i64, ptr %7, align 8, !tbaa !9
  %18 = icmp ule i64 %17, 0
  br i1 %18, label %19, label %20

19:                                               ; preds = %16, %13, %3
  store ptr null, ptr %4, align 8
  br label %39

20:                                               ; preds = %16
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %21 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %21, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #2
  %22 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %22, ptr %9, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  store i32 0, ptr %10, align 4, !tbaa !11
  br label %23

23:                                               ; preds = %30, %20
  %24 = load i32, ptr %10, align 4, !tbaa !11
  %25 = sext i32 %24 to i64
  %26 = load i64, ptr %7, align 8, !tbaa !9
  %27 = icmp ult i64 %25, %26
  br i1 %27, label %29, label %28

28:                                               ; preds = %23
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  br label %38

29:                                               ; preds = %23
  br label %30

30:                                               ; preds = %29
  %31 = load ptr, ptr %9, align 8, !tbaa !5
  %32 = getelementptr inbounds i8, ptr %31, i32 1
  store ptr %32, ptr %9, align 8, !tbaa !5
  %33 = load i8, ptr %31, align 1, !tbaa !13
  %34 = load ptr, ptr %8, align 8, !tbaa !5
  %35 = getelementptr inbounds i8, ptr %34, i32 1
  store ptr %35, ptr %8, align 8, !tbaa !5
  store i8 %33, ptr %34, align 1, !tbaa !13
  %36 = load i32, ptr %10, align 4, !tbaa !11
  %37 = add nsw i32 %36, 1
  store i32 %37, ptr %10, align 4, !tbaa !11
  br label %23, !llvm.loop !14

38:                                               ; preds = %28
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  br label %39

39:                                               ; preds = %38, %19
  %40 = load ptr, ptr %4, align 8
  ret ptr %40
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

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", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!7, !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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 noundef ptr @my_memcpy(ptr noundef writeonly %0, ptr noundef readonly %1, i64 noundef %2) local_unnamed_addr #0 {
  %4 = icmp eq ptr %1, null
  %5 = icmp eq ptr %0, null
  %or.cond.not17 = or i1 %5, %4
  %6 = icmp eq i64 %2, 0
  %or.cond3 = or i1 %or.cond.not17, %6
  br i1 %or.cond3, label %.loopexit, label %iter.check

iter.check:                                       ; preds = %3
  %7 = ptrtoint ptr %0 to i64
  %8 = ptrtoint ptr %1 to i64
  %min.iters.check = icmp ult i64 %2, 8
  %9 = sub i64 %7, %8
  %diff.check = icmp ult i64 %9, 32
  %or.cond = or i1 %min.iters.check, %diff.check
  br i1 %or.cond, label %.preheader.preheader, label %vector.main.loop.iter.check

vector.main.loop.iter.check:                      ; preds = %iter.check
  %min.iters.check22 = icmp ult i64 %2, 32
  br i1 %min.iters.check22, label %vec.epilog.ph, label %vector.ph

vector.ph:                                        ; preds = %vector.main.loop.iter.check
  %n.vec = and i64 %2, -32
  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.gep24 = getelementptr i8, ptr %0, i64 %index
  %10 = getelementptr i8, ptr %next.gep, i64 16
  %wide.load = load <16 x i8>, ptr %next.gep, align 1, !tbaa !5
  %wide.load26 = load <16 x i8>, ptr %10, align 1, !tbaa !5
  %11 = getelementptr i8, ptr %next.gep24, i64 16
  store <16 x i8> %wide.load, ptr %next.gep24, align 1, !tbaa !5
  store <16 x i8> %wide.load26, ptr %11, align 1, !tbaa !5
  %index.next = add nuw i64 %index, 32
  %12 = icmp eq i64 %index.next, %n.vec
  br i1 %12, label %middle.block, label %vector.body, !llvm.loop !8

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %2
  br i1 %cmp.n, label %.loopexit, label %vec.epilog.iter.check

vec.epilog.iter.check:                            ; preds = %middle.block
  %ind.end32 = getelementptr i8, ptr %0, i64 %n.vec
  %ind.end29 = getelementptr i8, ptr %1, i64 %n.vec
  %n.vec.remaining = and i64 %2, 24
  %min.epilog.iters.check = icmp eq i64 %n.vec.remaining, 0
  br i1 %min.epilog.iters.check, label %.preheader.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.vec28 = and i64 %2, -8
  %ind.end = getelementptr i8, ptr %1, i64 %n.vec28
  %ind.end31 = getelementptr i8, ptr %0, i64 %n.vec28
  br label %vec.epilog.vector.body

vec.epilog.vector.body:                           ; preds = %vec.epilog.vector.body, %vec.epilog.ph
  %index34 = phi i64 [ %vec.epilog.resume.val, %vec.epilog.ph ], [ %index.next38, %vec.epilog.vector.body ]
  %next.gep35 = getelementptr i8, ptr %1, i64 %index34
  %next.gep36 = getelementptr i8, ptr %0, i64 %index34
  %wide.load37 = load <8 x i8>, ptr %next.gep35, align 1, !tbaa !5
  store <8 x i8> %wide.load37, ptr %next.gep36, align 1, !tbaa !5
  %index.next38 = add nuw i64 %index34, 8
  %13 = icmp eq i64 %index.next38, %n.vec28
  br i1 %13, label %vec.epilog.middle.block, label %vec.epilog.vector.body, !llvm.loop !12

vec.epilog.middle.block:                          ; preds = %vec.epilog.vector.body
  %cmp.n39 = icmp eq i64 %n.vec28, %2
  br i1 %cmp.n39, label %.loopexit, label %.preheader.preheader

.preheader.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.vec28, %vec.epilog.middle.block ]
  %.01319.ph = phi ptr [ %1, %iter.check ], [ %ind.end29, %vec.epilog.iter.check ], [ %ind.end, %vec.epilog.middle.block ]
  %.01418.ph = phi ptr [ %0, %iter.check ], [ %ind.end32, %vec.epilog.iter.check ], [ %ind.end31, %vec.epilog.middle.block ]
  %xtraiter = and i64 %2, 7
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.preheader.prol.loopexit, label %.preheader.prol

.preheader.prol:                                  ; preds = %.preheader.preheader, %.preheader.prol
  %indvars.iv.prol = phi i64 [ %indvars.iv.next.prol, %.preheader.prol ], [ %indvars.iv.ph, %.preheader.preheader ]
  %.01319.prol = phi ptr [ %14, %.preheader.prol ], [ %.01319.ph, %.preheader.preheader ]
  %.01418.prol = phi ptr [ %16, %.preheader.prol ], [ %.01418.ph, %.preheader.preheader ]
  %prol.iter = phi i64 [ %prol.iter.next, %.preheader.prol ], [ 0, %.preheader.preheader ]
  %14 = getelementptr inbounds i8, ptr %.01319.prol, i64 1
  %15 = load i8, ptr %.01319.prol, align 1, !tbaa !5
  %16 = getelementptr inbounds i8, ptr %.01418.prol, i64 1
  store i8 %15, ptr %.01418.prol, 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 %.preheader.prol.loopexit, label %.preheader.prol, !llvm.loop !13

.preheader.prol.loopexit:                         ; preds = %.preheader.prol, %.preheader.preheader
  %indvars.iv.unr = phi i64 [ %indvars.iv.ph, %.preheader.preheader ], [ %indvars.iv.next.prol, %.preheader.prol ]
  %.01319.unr = phi ptr [ %.01319.ph, %.preheader.preheader ], [ %14, %.preheader.prol ]
  %.01418.unr = phi ptr [ %.01418.ph, %.preheader.preheader ], [ %16, %.preheader.prol ]
  %17 = sub i64 %indvars.iv.ph, %2
  %18 = icmp ugt i64 %17, -8
  br i1 %18, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %.preheader.prol.loopexit, %.preheader
  %indvars.iv = phi i64 [ %indvars.iv.next.7, %.preheader ], [ %indvars.iv.unr, %.preheader.prol.loopexit ]
  %.01319 = phi ptr [ %40, %.preheader ], [ %.01319.unr, %.preheader.prol.loopexit ]
  %.01418 = phi ptr [ %42, %.preheader ], [ %.01418.unr, %.preheader.prol.loopexit ]
  %19 = getelementptr inbounds i8, ptr %.01319, i64 1
  %20 = load i8, ptr %.01319, align 1, !tbaa !5
  %21 = getelementptr inbounds i8, ptr %.01418, i64 1
  store i8 %20, ptr %.01418, align 1, !tbaa !5
  %22 = getelementptr inbounds i8, ptr %.01319, i64 2
  %23 = load i8, ptr %19, align 1, !tbaa !5
  %24 = getelementptr inbounds i8, ptr %.01418, i64 2
  store i8 %23, ptr %21, align 1, !tbaa !5
  %25 = getelementptr inbounds i8, ptr %.01319, i64 3
  %26 = load i8, ptr %22, align 1, !tbaa !5
  %27 = getelementptr inbounds i8, ptr %.01418, i64 3
  store i8 %26, ptr %24, align 1, !tbaa !5
  %28 = getelementptr inbounds i8, ptr %.01319, i64 4
  %29 = load i8, ptr %25, align 1, !tbaa !5
  %30 = getelementptr inbounds i8, ptr %.01418, i64 4
  store i8 %29, ptr %27, align 1, !tbaa !5
  %31 = getelementptr inbounds i8, ptr %.01319, i64 5
  %32 = load i8, ptr %28, align 1, !tbaa !5
  %33 = getelementptr inbounds i8, ptr %.01418, i64 5
  store i8 %32, ptr %30, align 1, !tbaa !5
  %34 = getelementptr inbounds i8, ptr %.01319, i64 6
  %35 = load i8, ptr %31, align 1, !tbaa !5
  %36 = getelementptr inbounds i8, ptr %.01418, i64 6
  store i8 %35, ptr %33, align 1, !tbaa !5
  %37 = getelementptr inbounds i8, ptr %.01319, i64 7
  %38 = load i8, ptr %34, align 1, !tbaa !5
  %39 = getelementptr inbounds i8, ptr %.01418, i64 7
  store i8 %38, ptr %36, align 1, !tbaa !5
  %40 = getelementptr inbounds i8, ptr %.01319, i64 8
  %41 = load i8, ptr %37, align 1, !tbaa !5
  %42 = getelementptr inbounds i8, ptr %.01418, i64 8
  store i8 %41, ptr %39, align 1, !tbaa !5
  %indvars.iv.next.7 = add nuw nsw i64 %indvars.iv, 8
  %exitcond.not.7 = icmp eq i64 %indvars.iv.next.7, %2
  br i1 %exitcond.not.7, label %.loopexit, label %.preheader, !llvm.loop !15

.loopexit:                                        ; preds = %.preheader.prol.loopexit, %.preheader, %middle.block, %vec.epilog.middle.block, %3
  ret ptr null
}

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,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass