; LLVM IR from Simple-XX/SimpleKernel :: src/libc/src/string (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 @strcat(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %6, ptr %5, align 8, !tbaa !5
  %7 = load ptr, ptr %3, align 8, !tbaa !5
  %8 = icmp ne ptr %7, null
  br i1 %8, label %9, label %32

9:                                                ; preds = %2
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = icmp ne ptr %10, null
  br i1 %11, label %12, label %32

12:                                               ; preds = %9
  br label %13

13:                                               ; preds = %17, %12
  %14 = load ptr, ptr %5, align 8, !tbaa !5
  %15 = load i8, ptr %14, align 1, !tbaa !9
  %16 = icmp ne i8 %15, 0
  br i1 %16, label %17, label %20

17:                                               ; preds = %13
  %18 = load ptr, ptr %5, align 8, !tbaa !5
  %19 = getelementptr inbounds i8, ptr %18, i32 1
  store ptr %19, ptr %5, align 8, !tbaa !5
  br label %13, !llvm.loop !10

20:                                               ; preds = %13
  br label %21

21:                                               ; preds = %25, %20
  %22 = load ptr, ptr %4, align 8, !tbaa !5
  %23 = load i8, ptr %22, align 1, !tbaa !9
  %24 = icmp ne i8 %23, 0
  br i1 %24, label %25, label %31

25:                                               ; preds = %21
  %26 = load ptr, ptr %4, align 8, !tbaa !5
  %27 = getelementptr inbounds i8, ptr %26, i32 1
  store ptr %27, ptr %4, align 8, !tbaa !5
  %28 = load i8, ptr %26, align 1, !tbaa !9
  %29 = load ptr, ptr %5, align 8, !tbaa !5
  %30 = getelementptr inbounds i8, ptr %29, i32 1
  store ptr %30, ptr %5, align 8, !tbaa !5
  store i8 %28, ptr %29, align 1, !tbaa !9
  br label %21, !llvm.loop !12

31:                                               ; preds = %21
  br label %32

32:                                               ; preds = %31, %9, %2
  %33 = load ptr, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret ptr %33
}

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 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}
!12 = distinct !{!12, !11}


; 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 noundef ptr @strcat(ptr noundef returned %0, ptr noundef readonly %1) local_unnamed_addr #0 {
  %3 = icmp ne ptr %0, null
  %4 = icmp ne ptr %1, null
  %or.cond = and i1 %3, %4
  br i1 %or.cond, label %.preheader14, label %.loopexit

.preheader14:                                     ; preds = %2, %.preheader14
  %.0 = phi ptr [ %6, %.preheader14 ], [ %0, %2 ]
  %5 = load i8, ptr %.0, align 1, !tbaa !5
  %.not = icmp eq i8 %5, 0
  %6 = getelementptr inbounds i8, ptr %.0, i64 1
  br i1 %.not, label %.preheader, label %.preheader14, !llvm.loop !8

.preheader:                                       ; preds = %.preheader14
  %7 = load i8, ptr %1, align 1, !tbaa !5
  %.not1315 = icmp eq i8 %7, 0
  br i1 %.not1315, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %8 = phi i8 [ %11, %.lr.ph ], [ %7, %.preheader ]
  %.117 = phi ptr [ %10, %.lr.ph ], [ %.0, %.preheader ]
  %.01016 = phi ptr [ %9, %.lr.ph ], [ %1, %.preheader ]
  %9 = getelementptr inbounds i8, ptr %.01016, i64 1
  %10 = getelementptr inbounds i8, ptr %.117, i64 1
  store i8 %8, ptr %.117, align 1, !tbaa !5
  %11 = load i8, ptr %9, align 1, !tbaa !5
  %.not13 = icmp eq i8 %11, 0
  br i1 %.not13, label %.loopexit, label %.lr.ph, !llvm.loop !10

.loopexit:                                        ; preds = %.lr.ph, %.preheader, %2
  ret ptr %0
}

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}
!9 = !{!"llvm.loop.mustprogress"}
!10 = distinct !{!10, !9}


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