; LLVM IR from ftylitak/qzxing :: src/zxing/bigint/BigUnsigned.ll (ZNK11BigUnsigned9bitLengthEv)

; 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"

%class.NumberlikeArray = type { i32, i32, ptr }

; 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 i32 @_ZNK11BigUnsigned9bitLengthEv(ptr noundef nonnull align 8 dereferenceable(16) %0) #1 align 2 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  %6 = load ptr, ptr %3, align 8
  %7 = call noundef zeroext i1 @_ZNK11BigUnsigned6isZeroEv(ptr noundef nonnull align 8 dereferenceable(16) %6)
  br i1 %7, label %8, label %9

8:                                                ; preds = %1
  store i32 0, ptr %2, align 4
  br label %29

9:                                                ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %10 = getelementptr inbounds %class.NumberlikeArray, ptr %6, i32 0, i32 1
  %11 = load i32, ptr %10, align 4, !tbaa !9
  %12 = sub i32 %11, 1
  %13 = call noundef i64 @_ZNK11BigUnsigned8getBlockEj(ptr noundef nonnull align 8 dereferenceable(16) %6, i32 noundef %12)
  store i64 %13, ptr %4, align 8, !tbaa !12
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !14
  br label %14

14:                                               ; preds = %17, %9
  %15 = load i64, ptr %4, align 8, !tbaa !12
  %16 = icmp ne i64 %15, 0
  br i1 %16, label %17, label %22

17:                                               ; preds = %14
  %18 = load i64, ptr %4, align 8, !tbaa !12
  %19 = lshr i64 %18, 1
  store i64 %19, ptr %4, align 8, !tbaa !12
  %20 = load i32, ptr %5, align 4, !tbaa !14
  %21 = add i32 %20, 1
  store i32 %21, ptr %5, align 4, !tbaa !14
  br label %14, !llvm.loop !15

22:                                               ; preds = %14
  %23 = load i32, ptr %5, align 4, !tbaa !14
  %24 = getelementptr inbounds %class.NumberlikeArray, ptr %6, i32 0, i32 1
  %25 = load i32, ptr %24, align 4, !tbaa !9
  %26 = sub i32 %25, 1
  %27 = mul i32 %26, 64
  %28 = add i32 %23, %27
  store i32 %28, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  br label %29

29:                                               ; preds = %22, %8
  %30 = load i32, ptr %2, align 4
  ret i32 %30
}

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_ZNK11BigUnsigned6isZeroEv(ptr noundef nonnull align 8 dereferenceable(16)) #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNK11BigUnsigned8getBlockEj(ptr noundef nonnull align 8 dereferenceable(16), i32 noundef) #2 align 2

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 = { mustprogress 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 #3 = { 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, !11, i64 4}
!10 = !{!"_ZTS15NumberlikeArrayImE", !11, i64 0, !11, i64 4, !6, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = !{!13, !13, i64 0}
!13 = !{!"long", !7, i64 0}
!14 = !{!11, !11, 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: mustprogress uwtable
define dso_local noundef i32 @_ZNK11BigUnsigned9bitLengthEv(ptr noundef nonnull align 8 dereferenceable(16) %0) local_unnamed_addr #0 align 2 {
  %2 = tail call noundef zeroext i1 @_ZNK11BigUnsigned6isZeroEv(ptr noundef nonnull align 8 dereferenceable(16) %0)
  br i1 %2, label %13, label %._crit_edge

._crit_edge:                                      ; preds = %1
  %3 = getelementptr inbounds i8, ptr %0, i64 4
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %5 = add i32 %4, -1
  %6 = tail call noundef i64 @_ZNK11BigUnsigned8getBlockEj(ptr noundef nonnull align 8 dereferenceable(16) %0, i32 noundef %5)
  %.not7 = icmp eq i64 %6, 0
  %7 = tail call range(i64 0, 65) i64 @llvm.ctlz.i64(i64 %6, i1 true)
  %8 = trunc nuw nsw i64 %7 to i32
  %9 = sub nsw i32 0, %8
  %.0.lcssa = select i1 %.not7, i32 -64, i32 %9
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = shl i32 %10, 6
  %12 = add i32 %.0.lcssa, %11
  br label %13

13:                                               ; preds = %1, %._crit_edge
  %.06 = phi i32 [ %12, %._crit_edge ], [ 0, %1 ]
  ret i32 %.06
}

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_ZNK11BigUnsigned6isZeroEv(ptr noundef nonnull align 8 dereferenceable(16)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNK11BigUnsigned8getBlockEj(ptr noundef nonnull align 8 dereferenceable(16), i32 noundef) local_unnamed_addr #1 align 2

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.ctlz.i64(i64, i1 immarg) #2

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 = { mustprogress 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 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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, !7, i64 4}
!6 = !{!"_ZTS15NumberlikeArrayImE", !7, i64 0, !7, i64 4, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LCSSAPass,LoopIdiomRecognizePass,LoopRotatePass,LoopSimplifyPass,ReassociatePass,SCCPPass,SROAPass,SimplifyCFGPass,TailCallElimPass