; LLVM IR from Zhuagenborn/Tiny-x86-OS :: src/kernel/stl/cstring.ll (ZN3stl6memcpyEPvPKvj)

; 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"

%"class.stl::source_location" = type { ptr, ptr, i32, i32 }
%"class.stl::string_view" = type <{ ptr, i32, [4 x i8] }>

@.str = external hidden unnamed_addr constant [84 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [7 x i8], align 1

; Function Attrs: nounwind
declare void @_ZN3dbg6AssertEbN3stl11string_viewERKNS0_15source_locationE(i1 noundef zeroext, ptr, i32, ptr noundef nonnull align 8 dereferenceable(24)) #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN3stl11string_viewC2EPKc(ptr noundef nonnull align 8 dereferenceable(12), ptr noundef) unnamed_addr #1 align 2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN3stl15source_location7currentEPKcS2_jj(ptr dead_on_unwind noalias writable sret(%"class.stl::source_location") align 8, ptr noundef, ptr noundef, i32 noundef, i32 noundef) #1 align 2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN3stl6memcpyEPvPKvj(ptr noundef %0, ptr noundef %1, i32 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca %"class.stl::string_view", align 8
  %8 = alloca %"class.stl::source_location", align 8
  %9 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !9
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = icmp ne ptr %10, null
  br i1 %11, label %12, label %15

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

15:                                               ; preds = %12, %3
  %16 = phi i1 [ false, %3 ], [ %14, %12 ]
  call void @_ZN3stl11string_viewC2EPKc(ptr noundef nonnull align 8 dereferenceable(12) %7, ptr noundef null) #3
  call void @llvm.lifetime.start.p0(i64 24, ptr %8) #3
  call void @_ZN3stl15source_location7currentEPKcS2_jj(ptr dead_on_unwind writable sret(%"class.stl::source_location") align 8 %8, ptr noundef @.str, ptr noundef @.str.5, i32 noundef 47, i32 noundef 0) #3
  %17 = getelementptr inbounds { ptr, i32 }, ptr %7, i32 0, i32 0
  %18 = load ptr, ptr %17, align 8
  %19 = getelementptr inbounds { ptr, i32 }, ptr %7, i32 0, i32 1
  %20 = load i32, ptr %19, align 8
  call void @_ZN3dbg6AssertEbN3stl11string_viewERKNS0_15source_locationE(i1 noundef zeroext %16, ptr %18, i32 %20, ptr noundef nonnull align 8 dereferenceable(24) %8) #3
  call void @llvm.lifetime.end.p0(i64 24, ptr %8) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  store i32 0, ptr %9, align 4, !tbaa !9
  br label %21

21:                                               ; preds = %36, %15
  %22 = load i32, ptr %9, align 4, !tbaa !9
  %23 = load i32, ptr %6, align 4, !tbaa !9
  %24 = icmp ne i32 %22, %23
  br i1 %24, label %26, label %25

25:                                               ; preds = %21
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  br label %39

26:                                               ; preds = %21
  %27 = load ptr, ptr %5, align 8, !tbaa !5
  %28 = load i32, ptr %9, align 4, !tbaa !9
  %29 = zext i32 %28 to i64
  %30 = getelementptr inbounds i8, ptr %27, i64 %29
  %31 = load i8, ptr %30, align 1, !tbaa !11
  %32 = load ptr, ptr %4, align 8, !tbaa !5
  %33 = load i32, ptr %9, align 4, !tbaa !9
  %34 = zext i32 %33 to i64
  %35 = getelementptr inbounds i8, ptr %32, i64 %34
  store i8 %31, ptr %35, align 1, !tbaa !11
  br label %36

36:                                               ; preds = %26
  %37 = load i32, ptr %9, align 4, !tbaa !9
  %38 = add i32 %37, 1
  store i32 %38, ptr %9, align 4, !tbaa !9
  br label %21, !llvm.loop !12

39:                                               ; preds = %25
  ret void
}

attributes #0 = { nounwind "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 = { 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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 = !{!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"

%"class.stl::source_location" = type { ptr, ptr, i32, i32 }
%"class.stl::string_view" = type <{ ptr, i32, [4 x i8] }>

@.str = external hidden unnamed_addr constant [84 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [7 x i8], align 1

; Function Attrs: nounwind
declare void @_ZN3dbg6AssertEbN3stl11string_viewERKNS0_15source_locationE(i1 noundef zeroext, ptr, i32, ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN3stl11string_viewC2EPKc(ptr noundef nonnull align 8 dereferenceable(12), ptr noundef) unnamed_addr #1 align 2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN3stl15source_location7currentEPKcS2_jj(ptr dead_on_unwind noalias writable sret(%"class.stl::source_location") align 8, ptr noundef, ptr noundef, i32 noundef, i32 noundef) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN3stl6memcpyEPvPKvj(ptr noundef writeonly %0, ptr noundef readonly %1, i32 noundef %2) local_unnamed_addr #1 {
  %4 = alloca %"class.stl::string_view", align 8
  %5 = alloca %"class.stl::source_location", align 8
  %6 = icmp ne ptr %0, null
  %7 = icmp ne ptr %1, null
  %8 = and i1 %6, %7
  call void @_ZN3stl11string_viewC2EPKc(ptr noundef nonnull align 8 dereferenceable(12) %4, ptr noundef null) #3
  call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %5) #3
  call void @_ZN3stl15source_location7currentEPKcS2_jj(ptr dead_on_unwind nonnull writable sret(%"class.stl::source_location") align 8 %5, ptr noundef nonnull @.str, ptr noundef nonnull @.str.5, i32 noundef 47, i32 noundef 0) #3
  %9 = load ptr, ptr %4, align 8
  %10 = getelementptr inbounds i8, ptr %4, i64 8
  %11 = load i32, ptr %10, align 8
  call void @_ZN3dbg6AssertEbN3stl11string_viewERKNS0_15source_locationE(i1 noundef zeroext %8, ptr %9, i32 %11, ptr noundef nonnull align 8 dereferenceable(24) %5) #3
  call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %5) #3
  %.not8 = icmp eq i32 %2, 0
  br i1 %.not8, label %._crit_edge, label %iter.check

iter.check:                                       ; preds = %3
  %12 = ptrtoint ptr %0 to i64
  %13 = ptrtoint ptr %1 to i64
  %14 = zext i32 %2 to i64
  %min.iters.check = icmp ult i32 %2, 8
  %15 = sub i64 %12, %13
  %diff.check = icmp ult i64 %15, 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.check11 = icmp ult i32 %2, 32
  br i1 %min.iters.check11, label %vec.epilog.ph, label %vector.ph

vector.ph:                                        ; preds = %vector.main.loop.iter.check
  %n.vec = and i64 %14, 4294967264
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %16 = getelementptr inbounds i8, ptr %1, i64 %index
  %17 = getelementptr inbounds i8, ptr %16, i64 16
  %wide.load = load <16 x i8>, ptr %16, align 1, !tbaa !5
  %wide.load12 = load <16 x i8>, ptr %17, align 1, !tbaa !5
  %18 = getelementptr inbounds i8, ptr %0, i64 %index
  %19 = getelementptr inbounds i8, ptr %18, i64 16
  store <16 x i8> %wide.load, ptr %18, align 1, !tbaa !5
  store <16 x i8> %wide.load12, ptr %19, align 1, !tbaa !5
  %index.next = add nuw i64 %index, 32
  %20 = icmp eq i64 %index.next, %n.vec
  br i1 %20, label %middle.block, label %vector.body, !llvm.loop !8

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %14
  br i1 %cmp.n, label %._crit_edge, label %vec.epilog.iter.check

vec.epilog.iter.check:                            ; preds = %middle.block
  %n.vec.remaining = and i64 %14, 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

.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.vec14, %vec.epilog.middle.block ]
  %xtraiter = and i64 %14, 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 ]
  %21 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv.prol
  %22 = load i8, ptr %21, align 1, !tbaa !5
  %23 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.prol
  store i8 %22, ptr %23, 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 !12

.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 ]
  %24 = sub nsw i64 %indvars.iv.ph, %14
  %25 = icmp ugt i64 %24, -4
  br i1 %25, label %._crit_edge, label %.lr.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.vec14 = and i64 %14, 4294967288
  br label %vec.epilog.vector.body

vec.epilog.vector.body:                           ; preds = %vec.epilog.vector.body, %vec.epilog.ph
  %index15 = phi i64 [ %vec.epilog.resume.val, %vec.epilog.ph ], [ %index.next17, %vec.epilog.vector.body ]
  %26 = getelementptr inbounds i8, ptr %1, i64 %index15
  %wide.load16 = load <8 x i8>, ptr %26, align 1, !tbaa !5
  %27 = getelementptr inbounds i8, ptr %0, i64 %index15
  store <8 x i8> %wide.load16, ptr %27, align 1, !tbaa !5
  %index.next17 = add nuw i64 %index15, 8
  %28 = icmp eq i64 %index.next17, %n.vec14
  br i1 %28, label %vec.epilog.middle.block, label %vec.epilog.vector.body, !llvm.loop !14

vec.epilog.middle.block:                          ; preds = %vec.epilog.vector.body
  %cmp.n18 = icmp eq i64 %n.vec14, %14
  br i1 %cmp.n18, label %._crit_edge, label %.lr.ph.preheader

._crit_edge:                                      ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %middle.block, %vec.epilog.middle.block, %3
  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 ]
  %29 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv
  %30 = load i8, ptr %29, align 1, !tbaa !5
  %31 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv
  store i8 %30, ptr %31, align 1, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %32 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv.next
  %33 = load i8, ptr %32, align 1, !tbaa !5
  %34 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next
  store i8 %33, ptr %34, align 1, !tbaa !5
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %35 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv.next.1
  %36 = load i8, ptr %35, align 1, !tbaa !5
  %37 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next.1
  store i8 %36, ptr %37, align 1, !tbaa !5
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %38 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv.next.2
  %39 = load i8, ptr %38, align 1, !tbaa !5
  %40 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next.2
  store i8 %39, ptr %40, align 1, !tbaa !5
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 4
  %.not.3 = icmp eq i64 %indvars.iv.next.3, %14
  br i1 %.not.3, label %._crit_edge, label %.lr.ph, !llvm.loop !15
}

attributes #0 = { nounwind "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 = { 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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple 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, !13}
!13 = !{!"llvm.loop.unroll.disable"}
!14 = distinct !{!14, !9, !10, !11}
!15 = distinct !{!15, !9, !10}


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