; LLVM IR from Dimandragon/non-parametric-dsp :: alglib-cpp/src/ap.ll (ZN11alglib_impl10rmergedivvElPKNS_9ae_vectorEPS0_PNS_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::ae_vector" = type { i64, i64, i8, %"struct.alglib_impl::ae_dyn_block", %union.anon.0 }
%"struct.alglib_impl::ae_dyn_block" = type { ptr, ptr, ptr, ptr }
%union.anon.0 = 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_impl10rmergedivvElPKNS_9ae_vectorEPS0_PNS_8ae_stateE(i64 noundef %0, ptr noundef %1, ptr noundef %2, ptr noundef %3) #1 {
  %5 = alloca i64, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i64, align 8
  store i64 %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !9
  store ptr %2, ptr %7, align 8, !tbaa !9
  store ptr %3, ptr %8, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #2
  %10 = load i64, ptr %5, align 8, !tbaa !5
  %11 = icmp sge i64 %10, 16
  br i1 %11, label %12, label %13

12:                                               ; preds = %4
  br label %13

13:                                               ; preds = %12, %4
  store i64 0, ptr %9, align 8, !tbaa !5
  br label %14

14:                                               ; preds = %33, %13
  %15 = load i64, ptr %9, align 8, !tbaa !5
  %16 = load i64, ptr %5, align 8, !tbaa !5
  %17 = sub nsw i64 %16, 1
  %18 = icmp sle i64 %15, %17
  br i1 %18, label %19, label %36

19:                                               ; preds = %14
  %20 = load ptr, ptr %6, align 8, !tbaa !9
  %21 = getelementptr inbounds %"struct.alglib_impl::ae_vector", ptr %20, i32 0, i32 4
  %22 = load ptr, ptr %21, align 8, !tbaa !11
  %23 = load i64, ptr %9, align 8, !tbaa !5
  %24 = getelementptr inbounds double, ptr %22, i64 %23
  %25 = load double, ptr %24, align 8, !tbaa !12
  %26 = load ptr, ptr %7, align 8, !tbaa !9
  %27 = getelementptr inbounds %"struct.alglib_impl::ae_vector", ptr %26, i32 0, i32 4
  %28 = load ptr, ptr %27, align 8, !tbaa !11
  %29 = load i64, ptr %9, align 8, !tbaa !5
  %30 = getelementptr inbounds double, ptr %28, i64 %29
  %31 = load double, ptr %30, align 8, !tbaa !12
  %32 = fdiv double %31, %25
  store double %32, ptr %30, align 8, !tbaa !12
  br label %33

33:                                               ; preds = %19
  %34 = load i64, ptr %9, align 8, !tbaa !5
  %35 = add nsw i64 %34, 1
  store i64 %35, ptr %9, align 8, !tbaa !5
  br label %14, !llvm.loop !14

36:                                               ; preds = %14
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #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 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = !{!13, !13, i64 0}
!13 = !{!"double", !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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_impl10rmergedivvElPKNS_9ae_vectorEPS0_PNS_8ae_stateE(i64 noundef %0, ptr nocapture noundef readonly %1, ptr nocapture noundef readonly %2, ptr nocapture noundef readnone %3) local_unnamed_addr #0 {
  %.not.not7 = icmp sgt i64 %0, 0
  br i1 %.not.not7, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %4
  %5 = getelementptr inbounds i8, ptr %1, i64 56
  %6 = getelementptr inbounds i8, ptr %2, i64 56
  %xtraiter = and i64 %0, 1
  %7 = icmp eq i64 %0, 1
  br i1 %7, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.new

.lr.ph.new:                                       ; preds = %.lr.ph
  %unroll_iter = and i64 %0, 9223372036854775806
  br label %8

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

._crit_edge.loopexit.unr-lcssa:                   ; preds = %8, %.lr.ph
  %.08.unr = phi i64 [ 0, %.lr.ph ], [ %24, %8 ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %._crit_edge.loopexit.epilog-lcssa

._crit_edge.loopexit.epilog-lcssa:                ; preds = %._crit_edge.loopexit.unr-lcssa
  %25 = load ptr, ptr %5, align 8, !tbaa !5
  %26 = getelementptr inbounds double, ptr %25, i64 %.08.unr
  %27 = load double, ptr %26, align 8, !tbaa !8
  %28 = load ptr, ptr %6, align 8, !tbaa !5
  %29 = getelementptr inbounds double, ptr %28, i64 %.08.unr
  %30 = load double, ptr %29, align 8, !tbaa !8
  %31 = fdiv double %30, %27
  store double %31, ptr %29, align 8, !tbaa !8
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit.epilog-lcssa, %._crit_edge.loopexit.unr-lcssa, %4
  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, !6, i64 0}
!6 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"double", !6, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}


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