; LLVM IR from BoysTownOrg/chapro :: fft (cha_ifft)

; 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: nounwind uwtable
declare hidden i32 @ilog2(i32 noundef) #1

; Function Attrs: nounwind uwtable
declare hidden i32 @cfft2(ptr noundef, i32 noundef, i32 noundef) #1

; Function Attrs: nounwind uwtable
declare hidden i32 @cdft(ptr noundef, i32 noundef, i32 noundef) #1

; 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
define dso_local i32 @cha_ifft(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %10 = load i32, ptr %5, align 4, !tbaa !9
  %11 = icmp slt i32 %10, 2
  br i1 %11, label %12, label %13

12:                                               ; preds = %2
  store i32 0, ptr %3, align 4
  store i32 1, ptr %9, align 4
  br label %46

13:                                               ; preds = %2
  %14 = load i32, ptr %5, align 4, !tbaa !9
  %15 = call i32 @ilog2(i32 noundef %14)
  store i32 %15, ptr %6, align 4, !tbaa !9
  %16 = load i32, ptr %6, align 4, !tbaa !9
  %17 = icmp sgt i32 %16, 0
  br i1 %17, label %18, label %22

18:                                               ; preds = %13
  %19 = load ptr, ptr %4, align 8, !tbaa !5
  %20 = load i32, ptr %6, align 4, !tbaa !9
  %21 = call i32 @cfft2(ptr noundef %19, i32 noundef %20, i32 noundef 1)
  store i32 %21, ptr %7, align 4, !tbaa !9
  br label %26

22:                                               ; preds = %13
  %23 = load ptr, ptr %4, align 8, !tbaa !5
  %24 = load i32, ptr %5, align 4, !tbaa !9
  %25 = call i32 @cdft(ptr noundef %23, i32 noundef %24, i32 noundef 1)
  store i32 %25, ptr %7, align 4, !tbaa !9
  br label %26

26:                                               ; preds = %22, %18
  store i32 0, ptr %8, align 4, !tbaa !9
  br label %27

27:                                               ; preds = %41, %26
  %28 = load i32, ptr %8, align 4, !tbaa !9
  %29 = load i32, ptr %5, align 4, !tbaa !9
  %30 = mul nsw i32 %29, 2
  %31 = icmp slt i32 %28, %30
  br i1 %31, label %32, label %44

32:                                               ; preds = %27
  %33 = load i32, ptr %5, align 4, !tbaa !9
  %34 = sitofp i32 %33 to float
  %35 = load ptr, ptr %4, align 8, !tbaa !5
  %36 = load i32, ptr %8, align 4, !tbaa !9
  %37 = sext i32 %36 to i64
  %38 = getelementptr inbounds float, ptr %35, i64 %37
  %39 = load float, ptr %38, align 4, !tbaa !11
  %40 = fdiv float %39, %34
  store float %40, ptr %38, align 4, !tbaa !11
  br label %41

41:                                               ; preds = %32
  %42 = load i32, ptr %8, align 4, !tbaa !9
  %43 = add nsw i32 %42, 1
  store i32 %43, ptr %8, align 4, !tbaa !9
  br label %27, !llvm.loop !13

44:                                               ; preds = %27
  %45 = load i32, ptr %7, align 4, !tbaa !9
  store i32 %45, ptr %3, align 4
  store i32 1, ptr %9, align 4
  br label %46

46:                                               ; preds = %44, %12
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %47 = load i32, ptr %3, align 4
  ret i32 %47
}

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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"float", !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 hidden i32 @ilog2(i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare hidden i32 @cfft2(ptr noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare hidden i32 @cdft(ptr noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local i32 @cha_ifft(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp slt i32 %1, 2
  br i1 %3, label %.loopexit, label %4

4:                                                ; preds = %2
  %5 = tail call i32 @ilog2(i32 noundef %1)
  %6 = icmp sgt i32 %5, 0
  br i1 %6, label %7, label %9

7:                                                ; preds = %4
  %8 = tail call i32 @cfft2(ptr noundef %0, i32 noundef %5, i32 noundef 1)
  br label %vector.ph

9:                                                ; preds = %4
  %10 = tail call i32 @cdft(ptr noundef %0, i32 noundef %1, i32 noundef 1)
  br label %vector.ph

vector.ph:                                        ; preds = %9, %7
  %.014 = phi i32 [ %8, %7 ], [ %10, %9 ]
  %11 = shl nuw nsw i32 %1, 1
  %12 = uitofp nneg i32 %1 to float
  %wide.trip.count = zext nneg i32 %11 to i64
  %n.vec = and i64 %wide.trip.count, 2147483644
  %broadcast.splatinsert = insertelement <4 x float> poison, float %12, i64 0
  %broadcast.splat = shufflevector <4 x float> %broadcast.splatinsert, <4 x float> poison, <4 x i32> zeroinitializer
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %13 = getelementptr inbounds float, ptr %0, i64 %index
  %wide.load = load <4 x float>, ptr %13, align 4, !tbaa !5
  %14 = fdiv <4 x float> %wide.load, %broadcast.splat
  store <4 x float> %14, ptr %13, align 4, !tbaa !5
  %index.next = add nuw i64 %index, 4
  %15 = icmp eq i64 %index.next, %n.vec
  br i1 %15, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %.loopexit, label %scalar.ph

scalar.ph:                                        ; preds = %middle.block, %scalar.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %scalar.ph ], [ %n.vec, %middle.block ]
  %16 = getelementptr inbounds float, ptr %0, i64 %indvars.iv
  %17 = load float, ptr %16, align 4, !tbaa !5
  %18 = fdiv float %17, %12
  store float %18, ptr %16, align 4, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %.loopexit, label %scalar.ph, !llvm.loop !13

.loopexit:                                        ; preds = %scalar.ph, %middle.block, %2
  %.015 = phi i32 [ 0, %2 ], [ %.014, %middle.block ], [ %.014, %scalar.ph ]
  ret i32 %.015
}

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 = !{!"float", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !10, !12, !11}


; Effective O3 passes: CorrelatedValuePropagationPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,SROAPass,SimplifyCFGPass,TailCallElimPass