; 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"

; 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_ctwiddle(ptr noundef, ptr noundef, ptr noundef, ptr noundef, double noundef, double noundef) #1

; Function Attrs: nounwind uwtable
define dso_local void @reim_twiddle_fft_ref(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
  store i64 0, ptr %9, align 8, !tbaa !5
  br label %10

10:                                               ; preds = %38, %4
  %11 = load i64, ptr %9, align 8, !tbaa !5
  %12 = load i64, ptr %5, align 8, !tbaa !5
  %13 = icmp ult i64 %11, %12
  br i1 %13, label %15, label %14

14:                                               ; preds = %10
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #2
  br label %41

15:                                               ; preds = %10
  %16 = load ptr, ptr %6, align 8, !tbaa !9
  %17 = load i64, ptr %9, align 8, !tbaa !5
  %18 = getelementptr inbounds double, ptr %16, i64 %17
  %19 = load ptr, ptr %7, align 8, !tbaa !9
  %20 = load i64, ptr %9, align 8, !tbaa !5
  %21 = getelementptr inbounds double, ptr %19, i64 %20
  %22 = load ptr, ptr %6, align 8, !tbaa !9
  %23 = load i64, ptr %5, align 8, !tbaa !5
  %24 = load i64, ptr %9, align 8, !tbaa !5
  %25 = add i64 %23, %24
  %26 = getelementptr inbounds double, ptr %22, i64 %25
  %27 = load ptr, ptr %7, align 8, !tbaa !9
  %28 = load i64, ptr %5, align 8, !tbaa !5
  %29 = load i64, ptr %9, align 8, !tbaa !5
  %30 = add i64 %28, %29
  %31 = getelementptr inbounds double, ptr %27, i64 %30
  %32 = load ptr, ptr %8, align 8, !tbaa !9
  %33 = getelementptr inbounds double, ptr %32, i64 0
  %34 = load double, ptr %33, align 8, !tbaa !11
  %35 = load ptr, ptr %8, align 8, !tbaa !9
  %36 = getelementptr inbounds double, ptr %35, i64 1
  %37 = load double, ptr %36, align 8, !tbaa !11
  call void @reim_ctwiddle(ptr noundef %18, ptr noundef %21, ptr noundef %26, ptr noundef %31, double noundef %34, double noundef %37)
  br label %38

38:                                               ; preds = %15
  %39 = load i64, ptr %9, align 8, !tbaa !5
  %40 = add i64 %39, 1
  store i64 %40, ptr %9, align 8, !tbaa !5
  br label %10, !llvm.loop !13

41:                                               ; preds = %14
  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 = { 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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"double", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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: nounwind uwtable
declare dso_local void @reim_ctwiddle(ptr noundef, ptr noundef, ptr noundef, ptr noundef, double noundef, double noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @reim_twiddle_fft_ref(i64 noundef %0, ptr noundef %1, ptr noundef %2, ptr nocapture noundef readonly %3) local_unnamed_addr #0 {
  %.not = icmp eq i64 %0, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %4
  %5 = getelementptr inbounds i8, ptr %3, i64 8
  br label %6

._crit_edge:                                      ; preds = %6, %4
  ret void

6:                                                ; preds = %.lr.ph, %6
  %.015 = phi i64 [ 0, %.lr.ph ], [ %14, %6 ]
  %7 = getelementptr inbounds double, ptr %1, i64 %.015
  %8 = getelementptr inbounds double, ptr %2, i64 %.015
  %9 = add i64 %.015, %0
  %10 = getelementptr inbounds double, ptr %1, i64 %9
  %11 = getelementptr inbounds double, ptr %2, i64 %9
  %12 = load double, ptr %3, align 8, !tbaa !5
  %13 = load double, ptr %5, align 8, !tbaa !5
  tail call void @reim_ctwiddle(ptr noundef %7, ptr noundef %8, ptr noundef %10, ptr noundef %11, double noundef %12, double noundef %13)
  %14 = add nuw i64 %.015, 1
  %exitcond.not = icmp eq i64 %14, %0
  br i1 %exitcond.not, label %._crit_edge, label %6, !llvm.loop !9
}

attributes #0 = { 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" }

!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 = !{!"double", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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