; LLVM IR from zhemao/libds :: strutils (str_join)

; 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 allocsize(0)
declare noalias ptr @malloc(i64 noundef) #1

; 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 @str_join(ptr noundef %0, ptr noundef %1, i32 noundef %2) #2 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca ptr, align 8
  %11 = alloca i32, align 4
  %12 = alloca i32, align 4
  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 4, ptr %8) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #5
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #5
  %13 = load ptr, ptr %6, align 8, !tbaa !5
  %14 = call i64 @strlen(ptr noundef %13) #6
  %15 = trunc i64 %14 to i32
  store i32 %15, ptr %11, align 4, !tbaa !9
  %16 = load i32, ptr %7, align 4, !tbaa !9
  %17 = icmp eq i32 %16, 0
  br i1 %17, label %18, label %19

18:                                               ; preds = %3
  store ptr null, ptr %4, align 8
  store i32 1, ptr %12, align 4
  br label %77

19:                                               ; preds = %3
  %20 = load i32, ptr %7, align 4, !tbaa !9
  %21 = sub nsw i32 %20, 1
  %22 = load i32, ptr %11, align 4, !tbaa !9
  %23 = mul nsw i32 %21, %22
  store i32 %23, ptr %9, align 4, !tbaa !9
  store i32 0, ptr %8, align 4, !tbaa !9
  br label %24

24:                                               ; preds = %39, %19
  %25 = load i32, ptr %8, align 4, !tbaa !9
  %26 = load i32, ptr %7, align 4, !tbaa !9
  %27 = icmp slt i32 %25, %26
  br i1 %27, label %28, label %42

28:                                               ; preds = %24
  %29 = load ptr, ptr %5, align 8, !tbaa !5
  %30 = load i32, ptr %8, align 4, !tbaa !9
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds ptr, ptr %29, i64 %31
  %33 = load ptr, ptr %32, align 8, !tbaa !5
  %34 = call i64 @strlen(ptr noundef %33) #6
  %35 = load i32, ptr %9, align 4, !tbaa !9
  %36 = sext i32 %35 to i64
  %37 = add i64 %36, %34
  %38 = trunc i64 %37 to i32
  store i32 %38, ptr %9, align 4, !tbaa !9
  br label %39

39:                                               ; preds = %28
  %40 = load i32, ptr %8, align 4, !tbaa !9
  %41 = add nsw i32 %40, 1
  store i32 %41, ptr %8, align 4, !tbaa !9
  br label %24, !llvm.loop !11

42:                                               ; preds = %24
  %43 = load i32, ptr %9, align 4, !tbaa !9
  %44 = icmp eq i32 %43, 0
  br i1 %44, label %45, label %46

45:                                               ; preds = %42
  store ptr null, ptr %4, align 8
  store i32 1, ptr %12, align 4
  br label %77

46:                                               ; preds = %42
  %47 = load i32, ptr %9, align 4, !tbaa !9
  %48 = add nsw i32 %47, 1
  %49 = sext i32 %48 to i64
  %50 = mul i64 1, %49
  %51 = call noalias ptr @malloc(i64 noundef %50) #7
  store ptr %51, ptr %10, align 8, !tbaa !5
  %52 = load ptr, ptr %10, align 8, !tbaa !5
  %53 = load ptr, ptr %5, align 8, !tbaa !5
  %54 = getelementptr inbounds ptr, ptr %53, i64 0
  %55 = load ptr, ptr %54, align 8, !tbaa !5
  %56 = call ptr @strcpy(ptr noundef %52, ptr noundef %55) #5
  store i32 1, ptr %8, align 4, !tbaa !9
  br label %57

57:                                               ; preds = %72, %46
  %58 = load i32, ptr %8, align 4, !tbaa !9
  %59 = load i32, ptr %7, align 4, !tbaa !9
  %60 = icmp slt i32 %58, %59
  br i1 %60, label %61, label %75

61:                                               ; preds = %57
  %62 = load ptr, ptr %10, align 8, !tbaa !5
  %63 = load ptr, ptr %6, align 8, !tbaa !5
  %64 = call ptr @strcat(ptr noundef %62, ptr noundef %63) #5
  %65 = load ptr, ptr %10, align 8, !tbaa !5
  %66 = load ptr, ptr %5, align 8, !tbaa !5
  %67 = load i32, ptr %8, align 4, !tbaa !9
  %68 = sext i32 %67 to i64
  %69 = getelementptr inbounds ptr, ptr %66, i64 %68
  %70 = load ptr, ptr %69, align 8, !tbaa !5
  %71 = call ptr @strcat(ptr noundef %65, ptr noundef %70) #5
  br label %72

72:                                               ; preds = %61
  %73 = load i32, ptr %8, align 4, !tbaa !9
  %74 = add nsw i32 %73, 1
  store i32 %74, ptr %8, align 4, !tbaa !9
  br label %57, !llvm.loop !13

75:                                               ; preds = %57
  %76 = load ptr, ptr %10, align 8, !tbaa !5
  store ptr %76, ptr %4, align 8
  store i32 1, ptr %12, align 4
  br label %77

77:                                               ; preds = %75, %45, %18
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #5
  %78 = load ptr, ptr %4, align 8
  ret ptr %78
}

; Function Attrs: nounwind willreturn memory(read)
declare i64 @strlen(ptr noundef) #3

; Function Attrs: nounwind
declare ptr @strcpy(ptr noundef, ptr noundef) #4

; Function Attrs: nounwind
declare ptr @strcat(ptr noundef, ptr noundef) #4

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind allocsize(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 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 #3 = { nounwind willreturn memory(read) "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 #4 = { 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 #5 = { nounwind }
attributes #6 = { nounwind willreturn memory(read) }
attributes #7 = { nounwind allocsize(0) }

!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 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; 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: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #0

; Function Attrs: nofree nounwind uwtable
define dso_local noundef ptr @str_join(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, i32 noundef %2) local_unnamed_addr #1 {
  %4 = icmp eq i32 %2, 0
  br i1 %4, label %.loopexit, label %5

5:                                                ; preds = %3
  %6 = tail call i64 @strlen(ptr noundef nonnull dereferenceable(1) %1) #4
  %7 = trunc i64 %6 to i32
  %8 = add nsw i32 %2, -1
  %9 = mul nsw i32 %8, %7
  %10 = icmp sgt i32 %2, 0
  br i1 %10, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %5
  %wide.trip.count = zext nneg i32 %2 to i64
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %.lr.ph ]
  %.02426 = phi i32 [ %9, %.lr.ph.preheader ], [ %15, %.lr.ph ]
  %11 = getelementptr inbounds ptr, ptr %0, i64 %indvars.iv
  %12 = load ptr, ptr %11, align 8, !tbaa !5
  %13 = tail call i64 @strlen(ptr noundef nonnull dereferenceable(1) %12) #4
  %14 = trunc i64 %13 to i32
  %15 = add i32 %.02426, %14
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %5
  %.024.lcssa = phi i32 [ %9, %5 ], [ %15, %.lr.ph ]
  %16 = icmp eq i32 %.024.lcssa, 0
  br i1 %16, label %.loopexit, label %17

17:                                               ; preds = %._crit_edge
  %18 = add nsw i32 %.024.lcssa, 1
  %19 = sext i32 %18 to i64
  %20 = tail call noalias ptr @malloc(i64 noundef %19) #5
  %21 = load ptr, ptr %0, align 8, !tbaa !5
  %22 = tail call ptr @strcpy(ptr noundef nonnull dereferenceable(1) %20, ptr noundef nonnull dereferenceable(1) %21) #6
  %23 = icmp sgt i32 %2, 1
  br i1 %23, label %.lr.ph30.preheader, label %.loopexit

.lr.ph30.preheader:                               ; preds = %17
  %wide.trip.count35 = zext nneg i32 %2 to i64
  br label %.lr.ph30

.lr.ph30:                                         ; preds = %.lr.ph30.preheader, %.lr.ph30
  %indvars.iv32 = phi i64 [ 1, %.lr.ph30.preheader ], [ %indvars.iv.next33, %.lr.ph30 ]
  %24 = tail call ptr @strcat(ptr noundef nonnull dereferenceable(1) %20, ptr noundef nonnull dereferenceable(1) %1) #6
  %25 = getelementptr inbounds ptr, ptr %0, i64 %indvars.iv32
  %26 = load ptr, ptr %25, align 8, !tbaa !5
  %27 = tail call ptr @strcat(ptr noundef nonnull dereferenceable(1) %20, ptr noundef nonnull dereferenceable(1) %26) #6
  %indvars.iv.next33 = add nuw nsw i64 %indvars.iv32, 1
  %exitcond36.not = icmp eq i64 %indvars.iv.next33, %wide.trip.count35
  br i1 %exitcond36.not, label %.loopexit, label %.lr.ph30, !llvm.loop !11

.loopexit:                                        ; preds = %.lr.ph30, %17, %._crit_edge, %3
  %.0 = phi ptr [ null, %3 ], [ null, %._crit_edge ], [ %20, %17 ], [ %20, %.lr.ph30 ]
  ret ptr %.0
}

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: read)
declare i64 @strlen(ptr nocapture noundef) local_unnamed_addr #2

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: readwrite)
declare ptr @strcpy(ptr noalias noundef returned writeonly, ptr noalias nocapture noundef readonly) local_unnamed_addr #3

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: readwrite)
declare ptr @strcat(ptr noalias noundef returned, ptr noalias nocapture noundef readonly) local_unnamed_addr #3

attributes #0 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { nofree 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 nofree nounwind willreturn memory(argmem: read) "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 #3 = { mustprogress nofree nounwind willreturn memory(argmem: readwrite) "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 #4 = { nounwind willreturn memory(read) }
attributes #5 = { nounwind allocsize(0) }
attributes #6 = { 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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


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