; LLVM IR from kmilo17pet/QuarkTS-cpp :: src/bytebuffer.ll (ZN3qOS10byteBuffer20checkValidPowerOfTwoEm)

; 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: mustprogress nounwind uwtable
define dso_local noundef i64 @_ZN3qOS10byteBuffer20checkValidPowerOfTwoEm(i64 noundef %0) #0 align 2 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  store i64 %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  %5 = load i64, ptr %2, align 8, !tbaa !5
  store i64 %5, ptr %3, align 8, !tbaa !5
  %6 = load i64, ptr %2, align 8, !tbaa !5
  %7 = sub i64 %6, 1
  %8 = load i64, ptr %2, align 8, !tbaa !5
  %9 = and i64 %7, %8
  %10 = icmp ne i64 0, %9
  br i1 %10, label %11, label %31

11:                                               ; preds = %1
  %12 = load i64, ptr %2, align 8, !tbaa !5
  %13 = add i64 %12, -1
  store i64 %13, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  store i64 1, ptr %4, align 8, !tbaa !5
  br label %14

14:                                               ; preds = %24, %11
  %15 = load i64, ptr %4, align 8, !tbaa !5
  %16 = icmp ult i64 %15, 64
  br i1 %16, label %18, label %17

17:                                               ; preds = %14
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  br label %27

18:                                               ; preds = %14
  %19 = load i64, ptr %2, align 8, !tbaa !5
  %20 = load i64, ptr %2, align 8, !tbaa !5
  %21 = load i64, ptr %4, align 8, !tbaa !5
  %22 = lshr i64 %20, %21
  %23 = or i64 %19, %22
  store i64 %23, ptr %2, align 8, !tbaa !5
  br label %24

24:                                               ; preds = %18
  %25 = load i64, ptr %4, align 8, !tbaa !5
  %26 = mul i64 %25, 2
  store i64 %26, ptr %4, align 8, !tbaa !5
  br label %14, !llvm.loop !9

27:                                               ; preds = %17
  %28 = load i64, ptr %2, align 8, !tbaa !5
  %29 = add i64 %28, 1
  %30 = lshr i64 %29, 1
  store i64 %30, ptr %2, align 8, !tbaa !5
  br label %31

31:                                               ; preds = %27, %1
  %32 = load i64, ptr %2, align 8, !tbaa !5
  %33 = load i64, ptr %3, align 8, !tbaa !5
  %34 = icmp ult i64 %32, %33
  br i1 %34, label %35, label %38

35:                                               ; preds = %31
  %36 = load i64, ptr %2, align 8, !tbaa !5
  %37 = mul i64 %36, 2
  br label %40

38:                                               ; preds = %31
  %39 = load i64, ptr %2, align 8, !tbaa !5
  br label %40

40:                                               ; preds = %38, %35
  %41 = phi i64 [ %37, %35 ], [ %39, %38 ]
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret i64 %41
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { 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 #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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 nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i64 @_ZN3qOS10byteBuffer20checkValidPowerOfTwoEm(i64 noundef %0) local_unnamed_addr #0 align 2 {
  %2 = tail call range(i64 0, 65) i64 @llvm.ctpop.i64(i64 %0)
  %.not = icmp ult i64 %2, 2
  br i1 %.not, label %19, label %3

3:                                                ; preds = %1
  %4 = add i64 %0, -1
  %5 = lshr i64 %4, 1
  %6 = or i64 %5, %4
  %7 = lshr i64 %6, 2
  %8 = or i64 %7, %6
  %9 = lshr i64 %8, 4
  %10 = or i64 %9, %8
  %11 = lshr i64 %10, 8
  %12 = or i64 %11, %10
  %13 = lshr i64 %12, 16
  %14 = or i64 %13, %12
  %15 = lshr i64 %14, 32
  %16 = or i64 %15, %14
  %17 = add i64 %16, 1
  %18 = lshr i64 %17, 1
  br label %19

19:                                               ; preds = %3, %1
  %.1 = phi i64 [ %18, %3 ], [ %0, %1 ]
  %20 = icmp ult i64 %.1, %0
  %21 = zext i1 %20 to i64
  %22 = shl i64 %.1, %21
  ret i64 %22
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.ctpop.i64(i64) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(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" }
attributes #1 = { 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,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,LCSSAPass,LoopRotatePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass