; LLVM IR from Simple-XX/SimpleKernel :: src/kernel/slab.ll (ZNK4SLAB7get_idxEm)

; 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: 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 nounwind uwtable
define dso_local noundef i64 @_ZNK4SLAB7get_idxEm(ptr noundef nonnull align 8 dereferenceable(1057) %0, i64 noundef %1) #1 align 2 {
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  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 8, ptr %5) #2
  store i64 0, ptr %5, align 8, !tbaa !9
  %7 = load i64, ptr %4, align 8, !tbaa !9
  %8 = sub i64 %7, 1
  %9 = load i64, ptr %4, align 8, !tbaa !9
  %10 = add i64 %9, %8
  store i64 %10, ptr %4, align 8, !tbaa !9
  br label %11

11:                                               ; preds = %25, %2
  br label %12

12:                                               ; preds = %11
  %13 = load i64, ptr %4, align 8, !tbaa !9
  %14 = lshr i64 %13, 1
  store i64 %14, ptr %4, align 8, !tbaa !9
  %15 = load i64, ptr %4, align 8, !tbaa !9
  %16 = icmp eq i64 %15, 0
  br i1 %16, label %17, label %25

17:                                               ; preds = %12
  %18 = load i64, ptr %5, align 8, !tbaa !9
  %19 = icmp ult i64 %18, 8
  br i1 %19, label %20, label %21

20:                                               ; preds = %17
  store i64 0, ptr %5, align 8, !tbaa !9
  br label %24

21:                                               ; preds = %17
  %22 = load i64, ptr %5, align 8, !tbaa !9
  %23 = sub i64 %22, 8
  store i64 %23, ptr %5, align 8, !tbaa !9
  br label %24

24:                                               ; preds = %21, %20
  br label %28

25:                                               ; preds = %12
  %26 = load i64, ptr %5, align 8, !tbaa !9
  %27 = add i64 %26, 1
  store i64 %27, ptr %5, align 8, !tbaa !9
  br label %11, !llvm.loop !11

28:                                               ; preds = %24
  %29 = load i64, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret i64 %29
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { 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 = 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: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef range(i64 0, -8) i64 @_ZNK4SLAB7get_idxEm(ptr nocapture noundef nonnull readnone align 8 dereferenceable(1057) %0, i64 noundef %1) local_unnamed_addr #0 align 2 {
  %reass.add = shl i64 %1, 1
  %3 = add i64 %reass.add, -1
  %4 = icmp eq i64 %3, 1
  br i1 %4, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %2
  %.0.lcssa = phi i64 [ 0, %2 ], [ %6, %.lr.ph ]
  %.1 = tail call i64 @llvm.usub.sat.i64(i64 %.0.lcssa, i64 8)
  ret i64 %.1

.lr.ph:                                           ; preds = %2, %.lr.ph
  %.011 = phi i64 [ %6, %.lr.ph ], [ 0, %2 ]
  %.0810 = phi i64 [ %5, %.lr.ph ], [ %3, %2 ]
  %5 = lshr i64 %.0810, 1
  %6 = add nuw nsw i64 %.011, 1
  %7 = icmp ult i64 %.0810, 4
  br i1 %7, label %._crit_edge, label %.lr.ph, !llvm.loop !5
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.usub.sat.i64(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)"}
!5 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass