; LLVM IR from HarshCasper/NeoAlgo :: C/other (concatenate_two_strings)

; 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"

@.str = external hidden unnamed_addr constant [24 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [25 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [45 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca [100 x i8], align 16
  %3 = alloca [100 x i8], align 16
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 100, ptr %2) #3
  call void @llvm.lifetime.start.p0(i64 100, ptr %3) #3
  %6 = call i32 (ptr, ...) @printf(ptr noundef @.str)
  %7 = getelementptr inbounds [100 x i8], ptr %2, i64 0, i64 0
  %8 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef %7)
  %9 = call i32 (ptr, ...) @printf(ptr noundef @.str.2)
  %10 = getelementptr inbounds [100 x i8], ptr %3, i64 0, i64 0
  %11 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef %10)
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %4, align 4, !tbaa !5
  br label %12

12:                                               ; preds = %19, %0
  %13 = load i32, ptr %4, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [100 x i8], ptr %2, i64 0, i64 %14
  %16 = load i8, ptr %15, align 1, !tbaa !9
  %17 = sext i8 %16 to i32
  %18 = icmp ne i32 %17, 0
  br i1 %18, label %19, label %22

19:                                               ; preds = %12
  %20 = load i32, ptr %4, align 4, !tbaa !5
  %21 = add nsw i32 %20, 1
  store i32 %21, ptr %4, align 4, !tbaa !5
  br label %12, !llvm.loop !10

22:                                               ; preds = %12
  store i32 0, ptr %5, align 4, !tbaa !5
  br label %23

23:                                               ; preds = %38, %22
  %24 = load i32, ptr %5, align 4, !tbaa !5
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds [100 x i8], ptr %3, i64 0, i64 %25
  %27 = load i8, ptr %26, align 1, !tbaa !9
  %28 = sext i8 %27 to i32
  %29 = icmp ne i32 %28, 0
  br i1 %29, label %30, label %43

30:                                               ; preds = %23
  %31 = load i32, ptr %5, align 4, !tbaa !5
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds [100 x i8], ptr %3, i64 0, i64 %32
  %34 = load i8, ptr %33, align 1, !tbaa !9
  %35 = load i32, ptr %4, align 4, !tbaa !5
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds [100 x i8], ptr %2, i64 0, i64 %36
  store i8 %34, ptr %37, align 1, !tbaa !9
  br label %38

38:                                               ; preds = %30
  %39 = load i32, ptr %5, align 4, !tbaa !5
  %40 = add nsw i32 %39, 1
  store i32 %40, ptr %5, align 4, !tbaa !5
  %41 = load i32, ptr %4, align 4, !tbaa !5
  %42 = add nsw i32 %41, 1
  store i32 %42, ptr %4, align 4, !tbaa !5
  br label %23, !llvm.loop !12

43:                                               ; preds = %23
  %44 = load i32, ptr %4, align 4, !tbaa !5
  %45 = sext i32 %44 to i64
  %46 = getelementptr inbounds [100 x i8], ptr %2, i64 0, i64 %45
  store i8 0, ptr %46, align 1, !tbaa !9
  %47 = call i32 (ptr, ...) @printf(ptr noundef @.str.3)
  %48 = getelementptr inbounds [100 x i8], ptr %2, i64 0, i64 0
  %49 = call i32 @puts(ptr noundef %48)
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 100, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 100, ptr %2) #3
  ret i32 0
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

declare i32 @printf(ptr noundef, ...) #2

declare i32 @__isoc99_scanf(ptr noundef, ...) #2

declare i32 @puts(ptr noundef) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { 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 #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "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 }

!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 = !{!"int", !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"

@.str = external hidden unnamed_addr constant [24 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [25 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [45 x i8], align 1

; Function Attrs: nofree nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca [100 x i8], align 16
  %2 = alloca [100 x i8], align 16
  call void @llvm.lifetime.start.p0(i64 100, ptr nonnull %1) #3
  call void @llvm.lifetime.start.p0(i64 100, ptr nonnull %2) #3
  %3 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str)
  %4 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull %1)
  %5 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2)
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull %2)
  br label %7

7:                                                ; preds = %7, %0
  %indvars.iv = phi i64 [ %indvars.iv.next, %7 ], [ 0, %0 ]
  %8 = getelementptr inbounds [100 x i8], ptr %1, i64 0, i64 %indvars.iv
  %9 = load i8, ptr %8, align 1, !tbaa !5
  %.not = icmp eq i8 %9, 0
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  br i1 %.not, label %.preheader, label %7, !llvm.loop !8

.preheader:                                       ; preds = %7
  %10 = load i8, ptr %2, align 16, !tbaa !5
  %.not910 = icmp eq i8 %10, 0
  br i1 %.not910, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %indvars.iv16 = phi i64 [ %indvars.iv.next17, %.lr.ph ], [ %indvars.iv, %.preheader ]
  %indvars.iv14 = phi i64 [ %indvars.iv.next15, %.lr.ph ], [ 0, %.preheader ]
  %11 = phi i8 [ %14, %.lr.ph ], [ %10, %.preheader ]
  %12 = getelementptr inbounds [100 x i8], ptr %1, i64 0, i64 %indvars.iv16
  store i8 %11, ptr %12, align 1, !tbaa !5
  %indvars.iv.next15 = add nuw nsw i64 %indvars.iv14, 1
  %indvars.iv.next17 = add nuw nsw i64 %indvars.iv16, 1
  %13 = getelementptr inbounds [100 x i8], ptr %2, i64 0, i64 %indvars.iv.next15
  %14 = load i8, ptr %13, align 1, !tbaa !5
  %.not9 = icmp eq i8 %14, 0
  br i1 %.not9, label %._crit_edge, label %.lr.ph, !llvm.loop !10

._crit_edge:                                      ; preds = %.lr.ph, %.preheader
  %.1.lcssa.in = phi i64 [ %indvars.iv, %.preheader ], [ %indvars.iv.next17, %.lr.ph ]
  %15 = and i64 %.1.lcssa.in, 4294967295
  %16 = getelementptr inbounds [100 x i8], ptr %1, i64 0, i64 %15
  store i8 0, ptr %16, align 1, !tbaa !5
  %17 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.3)
  %18 = call i32 @puts(ptr noundef nonnull dereferenceable(1) %1)
  call void @llvm.lifetime.end.p0(i64 100, ptr nonnull %2) #3
  call void @llvm.lifetime.end.p0(i64 100, ptr nonnull %1) #3
  ret i32 0
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: nofree nounwind
declare noundef i32 @puts(ptr nocapture noundef readonly) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { 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 #1 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 #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/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}
!10 = distinct !{!10, !9}


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