; LLVM IR from smv1999/CompetitiveProgrammingQuestionBank :: Recursion/Last_index_of_element_in_array.ll (Z9lastIndexPiii)

; 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: mustprogress uwtable
define dso_local noundef i32 @_Z9lastIndexPiii(ptr noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store i32 %2, ptr %7, align 4, !tbaa !9
  %10 = load i32, ptr %6, align 4, !tbaa !9
  %11 = icmp eq i32 %10, 0
  br i1 %11, label %12, label %13

12:                                               ; preds = %3
  store i32 -1, ptr %4, align 4
  br label %34

13:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %14 = load ptr, ptr %5, align 8, !tbaa !5
  %15 = getelementptr inbounds i32, ptr %14, i64 1
  %16 = load i32, ptr %6, align 4, !tbaa !9
  %17 = sub nsw i32 %16, 1
  %18 = load i32, ptr %7, align 4, !tbaa !9
  %19 = call noundef i32 @_Z9lastIndexPiii(ptr noundef %15, i32 noundef %17, i32 noundef %18)
  store i32 %19, ptr %8, align 4, !tbaa !9
  %20 = load i32, ptr %8, align 4, !tbaa !9
  %21 = icmp eq i32 %20, -1
  br i1 %21, label %22, label %30

22:                                               ; preds = %13
  %23 = load ptr, ptr %5, align 8, !tbaa !5
  %24 = getelementptr inbounds i32, ptr %23, i64 0
  %25 = load i32, ptr %24, align 4, !tbaa !9
  %26 = load i32, ptr %7, align 4, !tbaa !9
  %27 = icmp eq i32 %25, %26
  br i1 %27, label %28, label %29

28:                                               ; preds = %22
  store i32 0, ptr %4, align 4
  store i32 1, ptr %9, align 4
  br label %33

29:                                               ; preds = %22
  store i32 -1, ptr %4, align 4
  store i32 1, ptr %9, align 4
  br label %33

30:                                               ; preds = %13
  %31 = load i32, ptr %8, align 4, !tbaa !9
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %4, align 4
  store i32 1, ptr %9, align 4
  br label %33

33:                                               ; preds = %30, %29, %28
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  br label %34

34:                                               ; preds = %33, %12
  %35 = load i32, ptr %4, align 4
  ret i32 %35
}

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

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

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


; 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 i32 @_Z9lastIndexPiii(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp eq i32 %1, 0
  br i1 %4, label %15, label %5

5:                                                ; preds = %3
  %6 = getelementptr inbounds i8, ptr %0, i64 4
  %7 = add nsw i32 %1, -1
  %8 = tail call noundef i32 @_Z9lastIndexPiii(ptr noundef nonnull %6, i32 noundef %7, i32 noundef %2)
  %9 = icmp eq i32 %8, -1
  br i1 %9, label %10, label %13

10:                                               ; preds = %5
  %11 = load i32, ptr %0, align 4, !tbaa !5
  %12 = icmp ne i32 %11, %2
  %. = sext i1 %12 to i32
  br label %15

13:                                               ; preds = %5
  %14 = add nuw nsw i32 %8, 1
  br label %15

15:                                               ; preds = %13, %10, %3
  %.1 = phi i32 [ -1, %3 ], [ %14, %13 ], [ %., %10 ]
  ret i32 %.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