; LLVM IR from theck01/offbrand_lib :: src/classes (obvector)

; 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 @obvector_find_valid_precursor(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  br label %5

5:                                                ; preds = %18, %2
  %6 = load i32, ptr %4, align 4, !tbaa !9
  %7 = icmp ult i32 %6, -1
  br i1 %7, label %8, label %16

8:                                                ; preds = %5
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = load i32, ptr %4, align 4, !tbaa !9
  %11 = zext i32 %10 to i64
  %12 = getelementptr inbounds ptr, ptr %9, i64 %11
  %13 = load ptr, ptr %12, align 8, !tbaa !5
  %14 = icmp ne ptr %13, null
  %15 = xor i1 %14, true
  br label %16

16:                                               ; preds = %8, %5
  %17 = phi i1 [ false, %5 ], [ %15, %8 ]
  br i1 %17, label %18, label %21

18:                                               ; preds = %16
  %19 = load i32, ptr %4, align 4, !tbaa !9
  %20 = add i32 %19, -1
  store i32 %20, ptr %4, align 4, !tbaa !9
  br label %5, !llvm.loop !11

21:                                               ; preds = %16
  %22 = load i32, ptr %4, align 4, !tbaa !9
  ret i32 %22
}

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}
!11 = distinct !{!11, !12}
!12 = !{!"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"

; Function Attrs: nofree norecurse nosync nounwind memory(argmem: read) uwtable
define dso_local i32 @obvector_find_valid_precursor(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %.not5 = icmp eq i32 %1, -1
  br i1 %.not5, label %.critedge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %6
  %.06 = phi i32 [ %7, %6 ], [ %1, %2 ]
  %3 = zext i32 %.06 to i64
  %4 = getelementptr inbounds ptr, ptr %0, i64 %3
  %5 = load ptr, ptr %4, align 8, !tbaa !5
  %.not4 = icmp eq ptr %5, null
  br i1 %.not4, label %6, label %.critedge

6:                                                ; preds = %.lr.ph
  %7 = add i32 %.06, -1
  %.not = icmp eq i32 %.06, 0
  br i1 %.not, label %.critedge, label %.lr.ph, !llvm.loop !9

.critedge:                                        ; preds = %.lr.ph, %6, %2
  %.0.lcssa = phi i32 [ -1, %2 ], [ -1, %6 ], [ %.06, %.lr.ph ]
  ret i32 %.0.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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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