; LLVM IR from MostafaTwfiq/C-DataStructures-And-Algorithms :: DataStructure/Strings/Sources (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"

%struct.String = type { ptr, i32, i32 }

@stderr = external global ptr, align 8
@.str = external hidden unnamed_addr constant [42 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [22 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [7 x i8], align 1
@.str.6 = external hidden unnamed_addr constant [31 x i8], align 1
@.str.13 = external hidden unnamed_addr constant [19 x i8], align 1

; Function Attrs: nounwind
declare i32 @fprintf(ptr noundef, ptr noundef, ...) #0

; Function Attrs: noreturn nounwind
declare void @exit(i32 noundef) #1

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

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

; Function Attrs: nounwind uwtable
declare dso_local void @stringAppendChar(ptr noundef, i8 noundef signext) #3

; Function Attrs: nounwind uwtable
define dso_local void @stringChangeStringS(ptr noundef %0, ptr noundef %1) #3 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  %7 = icmp eq ptr %6, null
  br i1 %7, label %8, label %11

8:                                                ; preds = %2
  %9 = load ptr, ptr @stderr, align 8, !tbaa !5
  %10 = call i32 (ptr, ptr, ...) @fprintf(ptr noundef %9, ptr noundef @.str.6, ptr noundef @.str.4, ptr noundef @.str.2) #4
  call void @exit(i32 noundef -83386157) #5
  unreachable

11:                                               ; preds = %2
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  %13 = icmp eq ptr %12, null
  br i1 %13, label %14, label %17

14:                                               ; preds = %11
  %15 = load ptr, ptr @stderr, align 8, !tbaa !5
  %16 = call i32 (ptr, ptr, ...) @fprintf(ptr noundef %15, ptr noundef @.str, ptr noundef @.str.13, ptr noundef @.str.2) #4
  call void @exit(i32 noundef -83384987) #5
  unreachable

17:                                               ; preds = %11
  br label %18

18:                                               ; preds = %17
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.String, ptr %19, i32 0, i32 1
  store i32 0, ptr %20, align 8, !tbaa !9
  %21 = load ptr, ptr %3, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.String, ptr %21, i32 0, i32 0
  %23 = load ptr, ptr %22, align 8, !tbaa !12
  %24 = load ptr, ptr %3, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.String, ptr %24, i32 0, i32 1
  %26 = load i32, ptr %25, align 8, !tbaa !9
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds i8, ptr %23, i64 %27
  store i8 0, ptr %28, align 1, !tbaa !13
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #4
  store i32 0, ptr %5, align 4, !tbaa !14
  br label %29

29:                                               ; preds = %40, %18
  %30 = load i32, ptr %5, align 4, !tbaa !14
  %31 = load ptr, ptr %4, align 8, !tbaa !5
  %32 = call i32 @stringGetLength(ptr noundef %31)
  %33 = icmp slt i32 %30, %32
  br i1 %33, label %35, label %34

34:                                               ; preds = %29
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #4
  br label %43

35:                                               ; preds = %29
  %36 = load ptr, ptr %3, align 8, !tbaa !5
  %37 = load ptr, ptr %4, align 8, !tbaa !5
  %38 = load i32, ptr %5, align 4, !tbaa !14
  %39 = call signext i8 @stringGet(ptr noundef %37, i32 noundef %38)
  call void @stringAppendChar(ptr noundef %36, i8 noundef signext %39)
  br label %40

40:                                               ; preds = %35
  %41 = load i32, ptr %5, align 4, !tbaa !14
  %42 = add nsw i32 %41, 1
  store i32 %42, ptr %5, align 4, !tbaa !14
  br label %29, !llvm.loop !15

43:                                               ; preds = %34
  ret void
}

; Function Attrs: nounwind uwtable
declare dso_local i32 @stringGetLength(ptr noundef) #3

; Function Attrs: nounwind uwtable
declare dso_local signext i8 @stringGet(ptr noundef, i32 noundef) #3

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 = { noreturn 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 #2 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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 #4 = { nounwind }
attributes #5 = { noreturn 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, !11, i64 8}
!10 = !{!"String", !6, i64 0, !11, i64 8, !11, i64 12}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 0}
!13 = !{!7, !7, i64 0}
!14 = !{!11, !11, i64 0}
!15 = distinct !{!15, !16}
!16 = !{!"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"

@stderr = external local_unnamed_addr global ptr, align 8
@.str = external hidden unnamed_addr constant [42 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [22 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [7 x i8], align 1
@.str.6 = external hidden unnamed_addr constant [31 x i8], align 1
@.str.13 = external hidden unnamed_addr constant [19 x i8], align 1

; Function Attrs: nofree nounwind
declare noundef i32 @fprintf(ptr nocapture noundef, ptr nocapture noundef readonly, ...) local_unnamed_addr #0

; Function Attrs: noreturn nounwind
declare void @exit(i32 noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
declare dso_local void @stringAppendChar(ptr noundef, i8 noundef signext) local_unnamed_addr #2

; Function Attrs: nounwind uwtable
define dso_local void @stringChangeStringS(ptr noundef %0, ptr noundef %1) local_unnamed_addr #2 {
  %3 = icmp eq ptr %0, null
  br i1 %3, label %4, label %7

4:                                                ; preds = %2
  %5 = load ptr, ptr @stderr, align 8, !tbaa !5
  %6 = tail call i32 (ptr, ptr, ...) @fprintf(ptr noundef %5, ptr noundef nonnull @.str.6, ptr noundef nonnull @.str.4, ptr noundef nonnull @.str.2) #3
  tail call void @exit(i32 noundef -83386157) #4
  unreachable

7:                                                ; preds = %2
  %8 = icmp eq ptr %1, null
  br i1 %8, label %9, label %12

9:                                                ; preds = %7
  %10 = load ptr, ptr @stderr, align 8, !tbaa !5
  %11 = tail call i32 (ptr, ptr, ...) @fprintf(ptr noundef %10, ptr noundef nonnull @.str, ptr noundef nonnull @.str.13, ptr noundef nonnull @.str.2) #3
  tail call void @exit(i32 noundef -83384987) #4
  unreachable

12:                                               ; preds = %7
  %13 = getelementptr inbounds i8, ptr %0, i64 8
  store i32 0, ptr %13, align 8, !tbaa !9
  %14 = load ptr, ptr %0, align 8, !tbaa !12
  store i8 0, ptr %14, align 1, !tbaa !13
  %15 = tail call i32 @stringGetLength(ptr noundef nonnull %1)
  %16 = icmp sgt i32 %15, 0
  br i1 %16, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph, %12
  ret void

.lr.ph:                                           ; preds = %12, %.lr.ph
  %.012 = phi i32 [ %18, %.lr.ph ], [ 0, %12 ]
  %17 = tail call signext i8 @stringGet(ptr noundef nonnull %1, i32 noundef %.012)
  tail call void @stringAppendChar(ptr noundef nonnull %0, i8 noundef signext %17)
  %18 = add nuw nsw i32 %.012, 1
  %19 = tail call i32 @stringGetLength(ptr noundef nonnull %1)
  %20 = icmp slt i32 %18, %19
  br i1 %20, label %.lr.ph, label %._crit_edge, !llvm.loop !14
}

; Function Attrs: nounwind uwtable
declare dso_local i32 @stringGetLength(ptr noundef) local_unnamed_addr #2

; Function Attrs: nounwind uwtable
declare dso_local signext i8 @stringGet(ptr noundef, i32 noundef) local_unnamed_addr #2

attributes #0 = { nofree 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 = { noreturn 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 #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 = { cold nounwind }
attributes #4 = { noreturn 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, !11, i64 8}
!10 = !{!"String", !6, i64 0, !11, i64 8, !11, i64 12}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 0}
!13 = !{!7, !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass