; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 03. Recursion (recursive)

; 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: nounwind uwtable
define dso_local i32 @linsearch(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
  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
  %8 = load i32, ptr %6, align 4, !tbaa !9
  %9 = load ptr, ptr %5, align 8, !tbaa !5
  %10 = load i32, ptr %9, align 4, !tbaa !9
  %11 = icmp eq i32 %8, %10
  br i1 %11, label %12, label %14

12:                                               ; preds = %3
  %13 = load i32, ptr %7, align 4, !tbaa !9
  store i32 %13, ptr %4, align 4
  br label %22

14:                                               ; preds = %3
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  %16 = getelementptr inbounds i32, ptr %15, i32 1
  store ptr %16, ptr %5, align 8, !tbaa !5
  %17 = load ptr, ptr %5, align 8, !tbaa !5
  %18 = load i32, ptr %6, align 4, !tbaa !9
  %19 = load i32, ptr %7, align 4, !tbaa !9
  %20 = add nsw i32 %19, 1
  store i32 %20, ptr %7, align 4, !tbaa !9
  %21 = call i32 @linsearch(ptr noundef %17, i32 noundef %18, i32 noundef %20)
  store i32 %21, ptr %4, align 4
  br label %22

22:                                               ; preds = %14, %12
  %23 = load i32, ptr %4, align 4
  ret i32 %23
}

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" }

!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, !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: nofree norecurse nosync nounwind memory(argmem: read) uwtable
define dso_local i32 @linsearch(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = load i32, ptr %0, align 4, !tbaa !5
  %5 = icmp eq i32 %4, %1
  br i1 %5, label %tailrecurse._crit_edge, label %tailrecurse

tailrecurse:                                      ; preds = %3, %tailrecurse
  %.tr911 = phi i32 [ %7, %tailrecurse ], [ %2, %3 ]
  %.tr10 = phi ptr [ %6, %tailrecurse ], [ %0, %3 ]
  %6 = getelementptr inbounds i8, ptr %.tr10, i64 4
  %7 = add nsw i32 %.tr911, 1
  %8 = load i32, ptr %6, align 4, !tbaa !5
  %9 = icmp eq i32 %8, %1
  br i1 %9, label %tailrecurse._crit_edge, label %tailrecurse

tailrecurse._crit_edge:                           ; preds = %tailrecurse, %3
  %.tr9.lcssa = phi i32 [ %2, %3 ], [ %7, %tailrecurse ]
  ret i32 %.tr9.lcssa
}

attributes #0 = { nofree norecurse nosync nounwind 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/C++ TBAA"}


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