; LLVM IR from venumb/ZSPACE :: cpp/depends/alglib/cpp/src/ap.ll (ZN11alglib_impl12ae_spin_waitEl)

; 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"

@_ZN11alglib_implL18ae_never_change_itE = external hidden global i64, align 8

; 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 void @_ZN11alglib_impl12ae_spin_waitEl(i64 noundef %0) #1 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  store i64 %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  %4 = load i64, ptr %2, align 8, !tbaa !5
  %5 = icmp sgt i64 %4, 305419896
  br i1 %5, label %6, label %9

6:                                                ; preds = %1
  %7 = load i64, ptr %2, align 8, !tbaa !5
  %8 = srem i64 %7, 10
  store volatile i64 %8, ptr @_ZN11alglib_implL18ae_never_change_itE, align 8, !tbaa !5
  br label %9

9:                                                ; preds = %6, %1
  store volatile i64 0, ptr %3, align 8, !tbaa !5
  br label %10

10:                                               ; preds = %21, %9
  %11 = load volatile i64, ptr %3, align 8, !tbaa !5
  %12 = load i64, ptr %2, align 8, !tbaa !5
  %13 = icmp slt i64 %11, %12
  br i1 %13, label %14, label %24

14:                                               ; preds = %10
  %15 = load volatile i64, ptr @_ZN11alglib_implL18ae_never_change_itE, align 8, !tbaa !5
  %16 = icmp sgt i64 %15, 0
  br i1 %16, label %17, label %20

17:                                               ; preds = %14
  %18 = load volatile i64, ptr @_ZN11alglib_implL18ae_never_change_itE, align 8, !tbaa !5
  %19 = add nsw i64 %18, -1
  store volatile i64 %19, ptr @_ZN11alglib_implL18ae_never_change_itE, align 8, !tbaa !5
  br label %20

20:                                               ; preds = %17, %14
  br label %21

21:                                               ; preds = %20
  %22 = load volatile i64, ptr %3, align 8, !tbaa !5
  %23 = add nsw i64 %22, 1
  store volatile i64 %23, ptr %3, align 8, !tbaa !5
  br label %10, !llvm.loop !9

24:                                               ; preds = %10
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret void
}

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 = !{!"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"

@_ZN11alglib_implL18ae_never_change_itE = external hidden global i64, align 8

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nofree norecurse nounwind memory(readwrite, argmem: none) uwtable
define dso_local void @_ZN11alglib_impl12ae_spin_waitEl(i64 noundef %0) local_unnamed_addr #1 {
  %2 = alloca i64, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2)
  %3 = icmp sgt i64 %0, 305419896
  br i1 %3, label %4, label %6

4:                                                ; preds = %1
  %5 = urem i64 %0, 10
  store volatile i64 %5, ptr @_ZN11alglib_implL18ae_never_change_itE, align 8, !tbaa !5
  br label %6

6:                                                ; preds = %4, %1
  store volatile i64 0, ptr %2, align 8, !tbaa !5
  %.0..0..0..0.4 = load volatile i64, ptr %2, align 8, !tbaa !5
  %7 = icmp slt i64 %.0..0..0..0.4, %0
  br i1 %7, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %6, %13
  %8 = load volatile i64, ptr @_ZN11alglib_implL18ae_never_change_itE, align 8, !tbaa !5
  %9 = icmp sgt i64 %8, 0
  br i1 %9, label %10, label %13

10:                                               ; preds = %.lr.ph
  %11 = load volatile i64, ptr @_ZN11alglib_implL18ae_never_change_itE, align 8, !tbaa !5
  %12 = add nsw i64 %11, -1
  store volatile i64 %12, ptr @_ZN11alglib_implL18ae_never_change_itE, align 8, !tbaa !5
  br label %13

13:                                               ; preds = %.lr.ph, %10
  %.0..0..0..0.1 = load volatile i64, ptr %2, align 8, !tbaa !5
  %14 = add nsw i64 %.0..0..0..0.1, 1
  store volatile i64 %14, ptr %2, align 8, !tbaa !5
  %.0..0..0..0. = load volatile i64, ptr %2, align 8, !tbaa !5
  %15 = icmp slt i64 %.0..0..0..0., %0
  br i1 %15, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %13, %6
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2)
  ret void
}

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress nofree norecurse nounwind memory(readwrite, argmem: 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, !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"}


; Effective O3 passes: CorrelatedValuePropagationPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass