; LLVM IR from tfhe/spqlios-arithmetic :: spqlios/reim (reim_fft_ref)

; 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.reim_fft_precomp = type { ptr, i64, i64, ptr, 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: nounwind uwtable
declare dso_local void @reim_fft16_ref(ptr noundef, ptr noundef, ptr noundef) #1

; Function Attrs: nounwind uwtable
declare dso_local void @reim_fft8_ref(ptr noundef, ptr noundef, ptr noundef) #1

; Function Attrs: nounwind uwtable
declare dso_local void @reim_fft4_ref(ptr noundef, ptr noundef, ptr noundef) #1

; Function Attrs: nounwind uwtable
declare dso_local void @reim_fft2_ref(ptr noundef, ptr noundef, ptr noundef) #1

; Function Attrs: nounwind uwtable
declare dso_local void @reim_fft_bfs_16_ref(i64 noundef, ptr noundef, ptr noundef, ptr noundef) #1

; Function Attrs: noreturn nounwind
declare void @abort() #2

; Function Attrs: nounwind uwtable
declare dso_local void @reim_fft_rec_16_ref(i64 noundef, ptr noundef, ptr noundef, ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local void @reim_fft_ref(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  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 4, ptr %5) #3
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.reim_fft_precomp, ptr %10, i32 0, i32 1
  %12 = load i64, ptr %11, align 8, !tbaa !9
  %13 = trunc i64 %12 to i32
  store i32 %13, ptr %5, align 4, !tbaa !12
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %14 = load ptr, ptr %3, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.reim_fft_precomp, ptr %14, i32 0, i32 3
  %16 = load ptr, ptr %15, align 8, !tbaa !14
  store ptr %16, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %17, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %18 = load ptr, ptr %4, align 8, !tbaa !5
  %19 = load i32, ptr %5, align 4, !tbaa !12
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds double, ptr %18, i64 %20
  store ptr %21, ptr %8, align 8, !tbaa !5
  %22 = load i32, ptr %5, align 4, !tbaa !12
  %23 = icmp sle i32 %22, 16
  br i1 %23, label %24, label %44

24:                                               ; preds = %2
  %25 = load i32, ptr %5, align 4, !tbaa !12
  switch i32 %25, label %43 [
    i32 1, label %26
    i32 2, label %27
    i32 4, label %31
    i32 8, label %35
    i32 16, label %39
  ]

26:                                               ; preds = %24
  store i32 1, ptr %9, align 4
  br label %57

27:                                               ; preds = %24
  %28 = load ptr, ptr %7, align 8, !tbaa !5
  %29 = load ptr, ptr %8, align 8, !tbaa !5
  %30 = load ptr, ptr %6, align 8, !tbaa !5
  call void @reim_fft2_ref(ptr noundef %28, ptr noundef %29, ptr noundef %30)
  store i32 1, ptr %9, align 4
  br label %57

31:                                               ; preds = %24
  %32 = load ptr, ptr %7, align 8, !tbaa !5
  %33 = load ptr, ptr %8, align 8, !tbaa !5
  %34 = load ptr, ptr %6, align 8, !tbaa !5
  call void @reim_fft4_ref(ptr noundef %32, ptr noundef %33, ptr noundef %34)
  store i32 1, ptr %9, align 4
  br label %57

35:                                               ; preds = %24
  %36 = load ptr, ptr %7, align 8, !tbaa !5
  %37 = load ptr, ptr %8, align 8, !tbaa !5
  %38 = load ptr, ptr %6, align 8, !tbaa !5
  call void @reim_fft8_ref(ptr noundef %36, ptr noundef %37, ptr noundef %38)
  store i32 1, ptr %9, align 4
  br label %57

39:                                               ; preds = %24
  %40 = load ptr, ptr %7, align 8, !tbaa !5
  %41 = load ptr, ptr %8, align 8, !tbaa !5
  %42 = load ptr, ptr %6, align 8, !tbaa !5
  call void @reim_fft16_ref(ptr noundef %40, ptr noundef %41, ptr noundef %42)
  store i32 1, ptr %9, align 4
  br label %57

43:                                               ; preds = %24
  call void @abort() #4
  unreachable

44:                                               ; preds = %2
  %45 = load i32, ptr %5, align 4, !tbaa !12
  %46 = icmp sle i32 %45, 2048
  br i1 %46, label %47, label %52

47:                                               ; preds = %44
  %48 = load i32, ptr %5, align 4, !tbaa !12
  %49 = sext i32 %48 to i64
  %50 = load ptr, ptr %7, align 8, !tbaa !5
  %51 = load ptr, ptr %8, align 8, !tbaa !5
  call void @reim_fft_bfs_16_ref(i64 noundef %49, ptr noundef %50, ptr noundef %51, ptr noundef %6)
  store i32 1, ptr %9, align 4
  br label %57

52:                                               ; preds = %44
  %53 = load i32, ptr %5, align 4, !tbaa !12
  %54 = sext i32 %53 to i64
  %55 = load ptr, ptr %7, align 8, !tbaa !5
  %56 = load ptr, ptr %8, align 8, !tbaa !5
  call void @reim_fft_rec_16_ref(i64 noundef %54, ptr noundef %55, ptr noundef %56, ptr noundef %6)
  store i32 1, ptr %9, align 4
  br label %57

57:                                               ; preds = %52, %47, %39, %35, %31, %27, %26
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 = { noreturn nounwind "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 #3 = { nounwind }
attributes #4 = { noreturn 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/C++ TBAA"}
!9 = !{!10, !11, i64 8}
!10 = !{!"reim_fft_precomp", !6, i64 0, !11, i64 8, !11, i64 16, !6, i64 24, !6, i64 32}
!11 = !{!"long", !7, i64 0}
!12 = !{!13, !13, i64 0}
!13 = !{!"int", !7, i64 0}
!14 = !{!10, !6, i64 24}


; 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 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: nounwind uwtable
declare dso_local void @reim_fft16_ref(ptr noundef, ptr noundef, ptr noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
declare dso_local void @reim_fft8_ref(ptr noundef, ptr noundef, ptr noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
declare dso_local void @reim_fft4_ref(ptr noundef, ptr noundef, ptr noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
declare dso_local void @reim_fft2_ref(ptr noundef, ptr noundef, ptr noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
declare dso_local void @reim_fft_bfs_16_ref(i64 noundef, ptr noundef, ptr noundef, ptr noundef) local_unnamed_addr #1

; Function Attrs: noreturn nounwind
declare void @abort() local_unnamed_addr #2

; Function Attrs: nounwind uwtable
declare dso_local void @reim_fft_rec_16_ref(i64 noundef, ptr noundef, ptr noundef, ptr noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local void @reim_fft_ref(ptr nocapture noundef readonly %0, ptr noundef %1) local_unnamed_addr #1 {
  %3 = alloca ptr, align 8
  %4 = getelementptr inbounds i8, ptr %0, i64 8
  %5 = load i64, ptr %4, align 8, !tbaa !5
  %6 = trunc i64 %5 to i32
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #3
  %7 = getelementptr inbounds i8, ptr %0, i64 24
  %8 = load ptr, ptr %7, align 8, !tbaa !11
  store ptr %8, ptr %3, align 8, !tbaa !12
  %sext = shl i64 %5, 32
  %9 = ashr exact i64 %sext, 32
  %10 = getelementptr inbounds double, ptr %1, i64 %9
  %11 = icmp slt i32 %6, 17
  br i1 %11, label %12, label %18

12:                                               ; preds = %2
  switch i32 %6, label %17 [
    i32 1, label %22
    i32 2, label %13
    i32 4, label %14
    i32 8, label %15
    i32 16, label %16
  ]

13:                                               ; preds = %12
  tail call void @reim_fft2_ref(ptr noundef %1, ptr noundef %10, ptr noundef %8)
  br label %22

14:                                               ; preds = %12
  tail call void @reim_fft4_ref(ptr noundef %1, ptr noundef %10, ptr noundef %8)
  br label %22

15:                                               ; preds = %12
  tail call void @reim_fft8_ref(ptr noundef %1, ptr noundef %10, ptr noundef %8)
  br label %22

16:                                               ; preds = %12
  tail call void @reim_fft16_ref(ptr noundef %1, ptr noundef %10, ptr noundef %8)
  br label %22

17:                                               ; preds = %12
  tail call void @abort() #4
  unreachable

18:                                               ; preds = %2
  %19 = icmp ult i32 %6, 2049
  br i1 %19, label %20, label %21

20:                                               ; preds = %18
  call void @reim_fft_bfs_16_ref(i64 noundef %9, ptr noundef %1, ptr noundef %10, ptr noundef nonnull %3)
  br label %22

21:                                               ; preds = %18
  call void @reim_fft_rec_16_ref(i64 noundef %9, ptr noundef %1, ptr noundef %10, ptr noundef nonnull %3)
  br label %22

22:                                               ; preds = %12, %21, %20, %16, %15, %14, %13
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #3
  ret void
}

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 = { noreturn nounwind "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 #3 = { nounwind }
attributes #4 = { noreturn 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, !10, i64 8}
!6 = !{!"reim_fft_precomp", !7, i64 0, !10, i64 8, !10, i64 16, !7, i64 24, !7, i64 32}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"long", !8, i64 0}
!11 = !{!6, !7, i64 24}
!12 = !{!7, !7, i64 0}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass