; LLVM IR from narke/Aragveli :: src/kernel/lib/c (string)

; 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 @strzcpy(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 i64, align 8
  %9 = 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
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  store i64 0, ptr %8, align 8, !tbaa !9
  br label %10

10:                                               ; preds = %31, %3
  %11 = load i64, ptr %8, align 8, !tbaa !9
  %12 = load i64, ptr %7, align 8, !tbaa !9
  %13 = icmp ult i64 %11, %12
  br i1 %13, label %14, label %34

14:                                               ; preds = %10
  %15 = load ptr, ptr %6, align 8, !tbaa !5
  %16 = load i64, ptr %8, align 8, !tbaa !9
  %17 = getelementptr inbounds i8, ptr %15, i64 %16
  %18 = load i8, ptr %17, align 1, !tbaa !11
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = load i64, ptr %8, align 8, !tbaa !9
  %21 = getelementptr inbounds i8, ptr %19, i64 %20
  store i8 %18, ptr %21, align 1, !tbaa !11
  %22 = load ptr, ptr %6, align 8, !tbaa !5
  %23 = load i64, ptr %8, align 8, !tbaa !9
  %24 = getelementptr inbounds i8, ptr %22, i64 %23
  %25 = load i8, ptr %24, align 1, !tbaa !11
  %26 = sext i8 %25 to i32
  %27 = icmp eq i32 %26, 0
  br i1 %27, label %28, label %30

28:                                               ; preds = %14
  %29 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %29, ptr %4, align 8
  store i32 1, ptr %9, align 4
  br label %40

30:                                               ; preds = %14
  br label %31

31:                                               ; preds = %30
  %32 = load i64, ptr %8, align 8, !tbaa !9
  %33 = add i64 %32, 1
  store i64 %33, ptr %8, align 8, !tbaa !9
  br label %10, !llvm.loop !12

34:                                               ; preds = %10
  %35 = load ptr, ptr %5, align 8, !tbaa !5
  %36 = load i64, ptr %7, align 8, !tbaa !9
  %37 = sub i64 %36, 1
  %38 = getelementptr inbounds i8, ptr %35, i64 %37
  store i8 0, ptr %38, align 1, !tbaa !11
  %39 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %39, ptr %4, align 8
  store i32 1, ptr %9, align 4
  br label %40

40:                                               ; preds = %34, %28
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  %41 = load ptr, ptr %4, align 8
  ret ptr %41
}

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 = !{!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 noundef ptr @strzcpy(ptr noundef returned writeonly %0, ptr nocapture noundef readonly %1, i64 noundef %2) local_unnamed_addr #0 {
  %.not = icmp eq i64 %2, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

4:                                                ; preds = %.lr.ph
  %5 = add nuw i64 %.015, 1
  %exitcond.not = icmp eq i64 %5, %2
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !5

.lr.ph:                                           ; preds = %3, %4
  %.015 = phi i64 [ %5, %4 ], [ 0, %3 ]
  %6 = getelementptr inbounds i8, ptr %1, i64 %.015
  %7 = load i8, ptr %6, align 1, !tbaa !7
  %8 = getelementptr inbounds i8, ptr %0, i64 %.015
  store i8 %7, ptr %8, align 1, !tbaa !7
  %9 = icmp eq i8 %7, 0
  br i1 %9, label %.loopexit, label %4

._crit_edge:                                      ; preds = %4, %3
  %10 = getelementptr i8, ptr %0, i64 %2
  %11 = getelementptr i8, ptr %10, i64 -1
  store i8 0, ptr %11, align 1, !tbaa !7
  br label %.loopexit

.loopexit:                                        ; preds = %.lr.ph, %._crit_edge
  ret ptr %0
}

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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}
!7 = !{!8, !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass