; LLVM IR from pixelsdb/mini-pixels :: pixels-core/lib/encoding/RunLenIntEncoder.ll (ZN16RunLenIntEncoder18findClosestNumBitsEl)

; 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.RunLenIntEncoder = type { i32, i32, i32, i32, i8, i8, i64, i64, i32, i8, i32, i32, i32, ptr, i32, i32, i32, i32, i32, i64, ptr, ptr, ptr, ptr, %class.EncodingUtils, %"class.std::shared_ptr" }
%class.EncodingUtils = type { ptr, ptr }
%"class.std::shared_ptr" = type { %"class.std::__shared_ptr" }
%"class.std::__shared_ptr" = type { ptr, %"class.std::__shared_count" }
%"class.std::__shared_count" = type { 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 @_ZN16RunLenIntEncoder18findClosestNumBitsEl(ptr noundef nonnull align 8 dereferenceable(168) %0, i64 noundef %1) #1 align 2 {
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !9
  %6 = load ptr, ptr %3, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !11
  br label %7

7:                                                ; preds = %10, %2
  %8 = load i64, ptr %4, align 8, !tbaa !9
  %9 = icmp ne i64 %8, 0
  br i1 %9, label %10, label %15

10:                                               ; preds = %7
  %11 = load i32, ptr %5, align 4, !tbaa !11
  %12 = add nsw i32 %11, 1
  store i32 %12, ptr %5, align 4, !tbaa !11
  %13 = load i64, ptr %4, align 8, !tbaa !9
  %14 = lshr i64 %13, 1
  store i64 %14, ptr %4, align 8, !tbaa !9
  br label %7, !llvm.loop !13

15:                                               ; preds = %7
  %16 = getelementptr inbounds %class.RunLenIntEncoder, ptr %6, i32 0, i32 24
  %17 = load i32, ptr %5, align 4, !tbaa !11
  %18 = call noundef i32 @_ZN13EncodingUtils19getClosestFixedBitsEi(ptr noundef nonnull align 8 dereferenceable(16) %16, i32 noundef %17)
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret i32 %18
}

declare noundef i32 @_ZN13EncodingUtils19getClosestFixedBitsEi(ptr noundef nonnull align 8 dereferenceable(16), i32 noundef) #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 = { "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, !10, i64 0}
!10 = !{!"long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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 @_ZN16RunLenIntEncoder18findClosestNumBitsEl(ptr noundef nonnull align 8 dereferenceable(168) %0, i64 noundef %1) local_unnamed_addr #0 align 2 {
._crit_edge:
  %.not5 = icmp eq i64 %1, 0
  %2 = tail call range(i64 0, 65) i64 @llvm.ctlz.i64(i64 %1, i1 true)
  %3 = trunc nuw nsw i64 %2 to i32
  %4 = sub nuw nsw i32 64, %3
  %.0.lcssa = select i1 %.not5, i32 0, i32 %4
  %5 = getelementptr inbounds i8, ptr %0, i64 136
  %6 = tail call noundef i32 @_ZN13EncodingUtils19getClosestFixedBitsEi(ptr noundef nonnull align 8 dereferenceable(16) %5, i32 noundef %.0.lcssa)
  ret i32 %6
}

declare noundef i32 @_ZN13EncodingUtils19getClosestFixedBitsEi(ptr noundef nonnull align 8 dereferenceable(16), i32 noundef) local_unnamed_addr #1

; 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 = { "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)"}


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