; LLVM IR from next-step-for-interview-prep/Coding-Ninjas-DSA-course_code_and_notes_cpp :: Milestone-3=DSA/lecture-notes/lecture-3=Recursion-1/code.ll (Z10is_sorted2Pii)

; 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: mustprogress uwtable
define dso_local noundef zeroext i1 @_Z10is_sorted2Pii(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca i1, align 1
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i8, align 1
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  %8 = load i32, ptr %5, align 4, !tbaa !9
  %9 = icmp eq i32 %8, 0
  br i1 %9, label %13, label %10

10:                                               ; preds = %2
  %11 = load i32, ptr %5, align 4, !tbaa !9
  %12 = icmp eq i32 %11, 1
  br i1 %12, label %13, label %14

13:                                               ; preds = %10, %2
  store i1 true, ptr %3, align 1
  br label %35

14:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 1, ptr %6) #2
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = getelementptr inbounds i32, ptr %15, i64 1
  %17 = load i32, ptr %5, align 4, !tbaa !9
  %18 = sub nsw i32 %17, 1
  %19 = call noundef zeroext i1 @_Z10is_sorted2Pii(ptr noundef %16, i32 noundef %18)
  %20 = zext i1 %19 to i8
  store i8 %20, ptr %6, align 1, !tbaa !11
  %21 = load i8, ptr %6, align 1, !tbaa !11, !range !13, !noundef !14
  %22 = trunc i8 %21 to i1
  br i1 %22, label %24, label %23

23:                                               ; preds = %14
  store i1 false, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %34

24:                                               ; preds = %14
  %25 = load ptr, ptr %4, align 8, !tbaa !5
  %26 = getelementptr inbounds i32, ptr %25, i64 0
  %27 = load i32, ptr %26, align 4, !tbaa !9
  %28 = load ptr, ptr %4, align 8, !tbaa !5
  %29 = getelementptr inbounds i32, ptr %28, i64 1
  %30 = load i32, ptr %29, align 4, !tbaa !9
  %31 = icmp sgt i32 %27, %30
  br i1 %31, label %32, label %33

32:                                               ; preds = %24
  store i1 false, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %34

33:                                               ; preds = %24
  store i1 true, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %34

34:                                               ; preds = %33, %32, %23
  call void @llvm.lifetime.end.p0(i64 1, ptr %6) #2
  br label %35

35:                                               ; preds = %34, %13
  %36 = load i1, ptr %3, align 1
  ret i1 %36
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"bool", !7, i64 0}
!13 = !{i8 0, i8 2}
!14 = !{}


; 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 nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef zeroext i1 @_Z10is_sorted2Pii(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %or.cond = icmp ult i32 %1, 2
  br i1 %or.cond, label %11, label %3

3:                                                ; preds = %2
  %4 = getelementptr inbounds i8, ptr %0, i64 4
  %5 = add nsw i32 %1, -1
  %6 = tail call noundef zeroext i1 @_Z10is_sorted2Pii(ptr noundef nonnull %4, i32 noundef %5)
  br i1 %6, label %7, label %11

7:                                                ; preds = %3
  %8 = load i32, ptr %0, align 4, !tbaa !5
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = icmp sle i32 %8, %9
  br label %11

11:                                               ; preds = %3, %7, %2
  %.1 = phi i1 [ true, %2 ], [ false, %3 ], [ %10, %7 ]
  ret i1 %.1
}

attributes #0 = { mustprogress nofree nosync nounwind willreturn memory(argmem: read) 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass