; LLVM IR from ravireddy07/cpp-book :: src/Hacker-Rank (structuring-the-document)

; 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.document = type { ptr, i32 }
%struct.paragraph = type { ptr, i32 }

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

; 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

declare i32 @printf(ptr noundef, ...) #1

; Function Attrs: nounwind uwtable
declare dso_local void @print_paragraph(ptr, i32) #2

; Function Attrs: nounwind uwtable
define dso_local void @print_document(ptr %0, i32 %1) #2 {
  %3 = alloca %struct.document, align 8
  %4 = alloca i32, align 4
  %5 = getelementptr inbounds { ptr, i32 }, ptr %3, i32 0, i32 0
  store ptr %0, ptr %5, align 8
  %6 = getelementptr inbounds { ptr, i32 }, ptr %3, i32 0, i32 1
  store i32 %1, ptr %6, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store i32 0, ptr %4, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %31, %2
  %8 = load i32, ptr %4, align 4, !tbaa !5
  %9 = getelementptr inbounds %struct.document, ptr %3, i32 0, i32 1
  %10 = load i32, ptr %9, align 8, !tbaa !9
  %11 = icmp slt i32 %8, %10
  br i1 %11, label %13, label %12

12:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  br label %34

13:                                               ; preds = %7
  %14 = getelementptr inbounds %struct.document, ptr %3, i32 0, i32 0
  %15 = load ptr, ptr %14, align 8, !tbaa !12
  %16 = load i32, ptr %4, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds %struct.paragraph, ptr %15, i64 %17
  %19 = getelementptr inbounds { ptr, i32 }, ptr %18, i32 0, i32 0
  %20 = load ptr, ptr %19, align 8
  %21 = getelementptr inbounds { ptr, i32 }, ptr %18, i32 0, i32 1
  %22 = load i32, ptr %21, align 8
  call void @print_paragraph(ptr %20, i32 %22)
  %23 = load i32, ptr %4, align 4, !tbaa !5
  %24 = getelementptr inbounds %struct.document, ptr %3, i32 0, i32 1
  %25 = load i32, ptr %24, align 8, !tbaa !9
  %26 = sub nsw i32 %25, 1
  %27 = icmp ne i32 %23, %26
  br i1 %27, label %28, label %30

28:                                               ; preds = %13
  %29 = call i32 (ptr, ...) @printf(ptr noundef @.str.3)
  br label %30

30:                                               ; preds = %28, %13
  br label %31

31:                                               ; preds = %30
  %32 = load i32, ptr %4, align 4, !tbaa !5
  %33 = add nsw i32 %32, 1
  store i32 %33, ptr %4, align 4, !tbaa !5
  br label %7, !llvm.loop !13

34:                                               ; preds = %12
  ret void
}

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

!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 = !{!10, !6, i64 8}
!10 = !{!"document", !11, i64 0, !6, i64 8}
!11 = !{!"any pointer", !7, i64 0}
!12 = !{!10, !11, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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"

%struct.paragraph = type { ptr, i32 }

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

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

; Function Attrs: nounwind uwtable
declare dso_local void @print_paragraph(ptr, i32) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local void @print_document(ptr nocapture readonly %0, i32 %1) local_unnamed_addr #1 {
  %3 = icmp sgt i32 %1, 0
  br i1 %3, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %2
  %4 = add nsw i32 %1, -1
  %5 = zext nneg i32 %4 to i64
  %wide.trip.count = zext nneg i32 %1 to i64
  br label %6

._crit_edge:                                      ; preds = %13, %2
  ret void

6:                                                ; preds = %.lr.ph, %13
  %indvars.iv = phi i64 [ 0, %.lr.ph ], [ %indvars.iv.next, %13 ]
  %7 = getelementptr inbounds %struct.paragraph, ptr %0, i64 %indvars.iv
  %8 = load ptr, ptr %7, align 8
  %9 = getelementptr inbounds i8, ptr %7, i64 8
  %10 = load i32, ptr %9, align 8
  tail call void @print_paragraph(ptr %8, i32 %10)
  %.not = icmp eq i64 %indvars.iv, %5
  br i1 %.not, label %13, label %11

11:                                               ; preds = %6
  %12 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.3)
  br label %13

13:                                               ; preds = %6, %11
  %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 %6, !llvm.loop !5
}

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 = { 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" }

!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"}


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