; LLVM IR from Dimandragon/non-parametric-dsp :: alglib-cpp/src/alglibinternal.ll (ZN11alglib_impl8nisclearEPNS_5nisetEPNS_8ae_stateE)

; 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"

%"struct.alglib_impl::niset" = type { i64, i64, %"struct.alglib_impl::ae_vector", %"struct.alglib_impl::ae_vector", i64 }
%"struct.alglib_impl::ae_vector" = type { i64, i64, i8, %"struct.alglib_impl::ae_dyn_block", %union.anon }
%"struct.alglib_impl::ae_dyn_block" = type { ptr, ptr, ptr, ptr }
%union.anon = 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 nounwind uwtable
define dso_local void @_ZN11alglib_impl8nisclearEPNS_5nisetEPNS_8ae_stateE(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %7 = load ptr, ptr %3, align 8, !tbaa !5
  %8 = getelementptr inbounds %"struct.alglib_impl::niset", ptr %7, i32 0, i32 1
  %9 = load i64, ptr %8, align 8, !tbaa !9
  store i64 %9, ptr %6, align 8, !tbaa !15
  store i64 0, ptr %5, align 8, !tbaa !15
  br label %10

10:                                               ; preds = %28, %2
  %11 = load i64, ptr %5, align 8, !tbaa !15
  %12 = load i64, ptr %6, align 8, !tbaa !15
  %13 = sub nsw i64 %12, 1
  %14 = icmp sle i64 %11, %13
  br i1 %14, label %15, label %31

15:                                               ; preds = %10
  %16 = load ptr, ptr %3, align 8, !tbaa !5
  %17 = getelementptr inbounds %"struct.alglib_impl::niset", ptr %16, i32 0, i32 3
  %18 = getelementptr inbounds %"struct.alglib_impl::ae_vector", ptr %17, i32 0, i32 4
  %19 = load ptr, ptr %18, align 8, !tbaa !16
  %20 = load ptr, ptr %3, align 8, !tbaa !5
  %21 = getelementptr inbounds %"struct.alglib_impl::niset", ptr %20, i32 0, i32 2
  %22 = getelementptr inbounds %"struct.alglib_impl::ae_vector", ptr %21, i32 0, i32 4
  %23 = load ptr, ptr %22, align 8, !tbaa !16
  %24 = load i64, ptr %5, align 8, !tbaa !15
  %25 = getelementptr inbounds i64, ptr %23, i64 %24
  %26 = load i64, ptr %25, align 8, !tbaa !15
  %27 = getelementptr inbounds i64, ptr %19, i64 %26
  store i64 -1, ptr %27, align 8, !tbaa !15
  br label %28

28:                                               ; preds = %15
  %29 = load i64, ptr %5, align 8, !tbaa !15
  %30 = add nsw i64 %29, 1
  store i64 %30, ptr %5, align 8, !tbaa !15
  br label %10, !llvm.loop !17

31:                                               ; preds = %10
  %32 = load ptr, ptr %3, align 8, !tbaa !5
  %33 = getelementptr inbounds %"struct.alglib_impl::niset", ptr %32, i32 0, i32 1
  store i64 0, ptr %33, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !11, i64 8}
!10 = !{!"_ZTSN11alglib_impl5nisetE", !11, i64 0, !11, i64 8, !12, i64 16, !12, i64 80, !11, i64 144}
!11 = !{!"long", !7, i64 0}
!12 = !{!"_ZTSN11alglib_impl9ae_vectorE", !11, i64 0, !11, i64 8, !13, i64 16, !14, i64 24, !7, i64 56}
!13 = !{!"bool", !7, i64 0}
!14 = !{!"_ZTSN11alglib_impl12ae_dyn_blockE", !6, i64 0, !6, i64 8, !6, i64 16, !6, i64 24}
!15 = !{!11, !11, i64 0}
!16 = !{!7, !7, i64 0}
!17 = distinct !{!17, !18}
!18 = !{!"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 memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @_ZN11alglib_impl8nisclearEPNS_5nisetEPNS_8ae_stateE(ptr nocapture noundef %0, ptr nocapture noundef readnone %1) local_unnamed_addr #0 {
  %3 = getelementptr inbounds i8, ptr %0, i64 8
  %4 = load i64, ptr %3, align 8, !tbaa !5
  %.not.not7 = icmp sgt i64 %4, 0
  br i1 %.not.not7, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %2
  %5 = getelementptr inbounds i8, ptr %0, i64 136
  %6 = getelementptr inbounds i8, ptr %0, i64 72
  %xtraiter = and i64 %4, 3
  %7 = icmp ult i64 %4, 4
  br i1 %7, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.new

.lr.ph.new:                                       ; preds = %.lr.ph
  %unroll_iter = and i64 %4, 9223372036854775804
  br label %8

8:                                                ; preds = %8, %.lr.ph.new
  %.08 = phi i64 [ 0, %.lr.ph.new ], [ %32, %8 ]
  %niter = phi i64 [ 0, %.lr.ph.new ], [ %niter.next.3, %8 ]
  %9 = load ptr, ptr %5, align 8, !tbaa !14
  %10 = load ptr, ptr %6, align 8, !tbaa !14
  %11 = getelementptr inbounds i64, ptr %10, i64 %.08
  %12 = load i64, ptr %11, align 8, !tbaa !15
  %13 = getelementptr inbounds i64, ptr %9, i64 %12
  store i64 -1, ptr %13, align 8, !tbaa !15
  %14 = or disjoint i64 %.08, 1
  %15 = load ptr, ptr %5, align 8, !tbaa !14
  %16 = load ptr, ptr %6, align 8, !tbaa !14
  %17 = getelementptr inbounds i64, ptr %16, i64 %14
  %18 = load i64, ptr %17, align 8, !tbaa !15
  %19 = getelementptr inbounds i64, ptr %15, i64 %18
  store i64 -1, ptr %19, align 8, !tbaa !15
  %20 = or disjoint i64 %.08, 2
  %21 = load ptr, ptr %5, align 8, !tbaa !14
  %22 = load ptr, ptr %6, align 8, !tbaa !14
  %23 = getelementptr inbounds i64, ptr %22, i64 %20
  %24 = load i64, ptr %23, align 8, !tbaa !15
  %25 = getelementptr inbounds i64, ptr %21, i64 %24
  store i64 -1, ptr %25, align 8, !tbaa !15
  %26 = or disjoint i64 %.08, 3
  %27 = load ptr, ptr %5, align 8, !tbaa !14
  %28 = load ptr, ptr %6, align 8, !tbaa !14
  %29 = getelementptr inbounds i64, ptr %28, i64 %26
  %30 = load i64, ptr %29, align 8, !tbaa !15
  %31 = getelementptr inbounds i64, ptr %27, i64 %30
  store i64 -1, ptr %31, align 8, !tbaa !15
  %32 = add nuw nsw i64 %.08, 4
  %niter.next.3 = add i64 %niter, 4
  %niter.ncmp.3 = icmp eq i64 %niter.next.3, %unroll_iter
  br i1 %niter.ncmp.3, label %._crit_edge.loopexit.unr-lcssa, label %8, !llvm.loop !16

._crit_edge.loopexit.unr-lcssa:                   ; preds = %8, %.lr.ph
  %.08.unr = phi i64 [ 0, %.lr.ph ], [ %32, %8 ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %.epil.preheader

.epil.preheader:                                  ; preds = %._crit_edge.loopexit.unr-lcssa, %.epil.preheader
  %.08.epil = phi i64 [ %38, %.epil.preheader ], [ %.08.unr, %._crit_edge.loopexit.unr-lcssa ]
  %epil.iter = phi i64 [ %epil.iter.next, %.epil.preheader ], [ 0, %._crit_edge.loopexit.unr-lcssa ]
  %33 = load ptr, ptr %5, align 8, !tbaa !14
  %34 = load ptr, ptr %6, align 8, !tbaa !14
  %35 = getelementptr inbounds i64, ptr %34, i64 %.08.epil
  %36 = load i64, ptr %35, align 8, !tbaa !15
  %37 = getelementptr inbounds i64, ptr %33, i64 %36
  store i64 -1, ptr %37, align 8, !tbaa !15
  %38 = add nuw nsw i64 %.08.epil, 1
  %epil.iter.next = add i64 %epil.iter, 1
  %epil.iter.cmp.not = icmp eq i64 %epil.iter.next, %xtraiter
  br i1 %epil.iter.cmp.not, label %._crit_edge, label %.epil.preheader, !llvm.loop !18

._crit_edge:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.epil.preheader, %2
  store i64 0, ptr %3, align 8, !tbaa !5
  ret void
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: 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, !7, i64 8}
!6 = !{!"_ZTSN11alglib_impl5nisetE", !7, i64 0, !7, i64 8, !10, i64 16, !10, i64 80, !7, i64 144}
!7 = !{!"long", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"_ZTSN11alglib_impl9ae_vectorE", !7, i64 0, !7, i64 8, !11, i64 16, !12, i64 24, !8, i64 56}
!11 = !{!"bool", !8, i64 0}
!12 = !{!"_ZTSN11alglib_impl12ae_dyn_blockE", !13, i64 0, !13, i64 8, !13, i64 16, !13, i64 24}
!13 = !{!"any pointer", !8, i64 0}
!14 = !{!8, !8, i64 0}
!15 = !{!7, !7, i64 0}
!16 = distinct !{!16, !17}
!17 = !{!"llvm.loop.mustprogress"}
!18 = distinct !{!18, !19}
!19 = !{!"llvm.loop.unroll.disable"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass