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

; 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.obint_struct = type { ptr, i8, ptr, i64 }

; 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: nounwind uwtable
define dso_local i64 @obint_most_sig(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca i64, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  %4 = load ptr, ptr %2, align 8, !tbaa !5
  %5 = getelementptr inbounds %struct.obint_struct, ptr %4, i32 0, i32 3
  %6 = load i64, ptr %5, align 8, !tbaa !9
  %7 = sub i64 %6, 1
  store i64 %7, ptr %3, align 8, !tbaa !12
  br label %8

8:                                                ; preds = %21, %1
  %9 = load ptr, ptr %2, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.obint_struct, ptr %9, i32 0, i32 2
  %11 = load ptr, ptr %10, align 8, !tbaa !13
  %12 = load i64, ptr %3, align 8, !tbaa !12
  %13 = getelementptr inbounds i8, ptr %11, i64 %12
  %14 = load i8, ptr %13, align 1, !tbaa !14
  %15 = icmp ne i8 %14, 0
  br i1 %15, label %19, label %16

16:                                               ; preds = %8
  %17 = load i64, ptr %3, align 8, !tbaa !12
  %18 = icmp ugt i64 %17, 0
  br label %19

19:                                               ; preds = %16, %8
  %20 = phi i1 [ false, %8 ], [ %18, %16 ]
  br i1 %20, label %21, label %24

21:                                               ; preds = %19
  %22 = load i64, ptr %3, align 8, !tbaa !12
  %23 = add i64 %22, -1
  store i64 %23, ptr %3, align 8, !tbaa !12
  br label %8, !llvm.loop !15

24:                                               ; preds = %19
  %25 = load i64, ptr %3, align 8, !tbaa !12
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret i64 %25
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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" }
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/C++ TBAA"}
!9 = !{!10, !11, i64 24}
!10 = !{!"obint_struct", !6, i64 0, !7, i64 8, !6, i64 16, !11, i64 24}
!11 = !{!"long", !7, i64 0}
!12 = !{!11, !11, i64 0}
!13 = !{!10, !6, i64 16}
!14 = !{!7, !7, i64 0}
!15 = distinct !{!15, !16}
!16 = !{!"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(read, inaccessiblemem: none) uwtable
define dso_local i64 @obint_most_sig(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = getelementptr inbounds i8, ptr %0, i64 24
  %3 = load i64, ptr %2, align 8, !tbaa !5
  %4 = getelementptr inbounds i8, ptr %0, i64 16
  %5 = load ptr, ptr %4, align 8, !tbaa !11
  br label %6

6:                                                ; preds = %6, %1
  %.0.in = phi i64 [ %3, %1 ], [ %.0, %6 ]
  %.0 = add i64 %.0.in, -1
  %7 = getelementptr inbounds i8, ptr %5, i64 %.0
  %8 = load i8, ptr %7, align 1, !tbaa !12
  %.not = icmp eq i8 %8, 0
  %9 = icmp ne i64 %.0, 0
  %10 = and i1 %9, %.not
  br i1 %10, label %6, label %11, !llvm.loop !13

11:                                               ; preds = %6
  ret i64 %.0
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) 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, !10, i64 24}
!6 = !{!"obint_struct", !7, i64 0, !8, i64 8, !7, i64 16, !10, i64 24}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"long", !8, i64 0}
!11 = !{!6, !7, i64 16}
!12 = !{!8, !8, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LICMPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass