; LLVM IR from jgaeddert/liquid-dsp :: src/filter/src (filter_rrrf)

; 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.iirinterp_rrrf_s = type { i32, 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 i32 @iirfilt_rrrf_execute(ptr noundef, float noundef, ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @iirinterp_rrrf_execute(ptr noundef %0, float noundef %1, ptr noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca float, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store float %1, ptr %5, align 4, !tbaa !9
  store ptr %2, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %7, align 4, !tbaa !11
  br label %8

8:                                                ; preds = %30, %3
  %9 = load i32, ptr %7, align 4, !tbaa !11
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.iirinterp_rrrf_s, ptr %10, i32 0, i32 0
  %12 = load i32, ptr %11, align 8, !tbaa !13
  %13 = icmp ult i32 %9, %12
  br i1 %13, label %14, label %33

14:                                               ; preds = %8
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.iirinterp_rrrf_s, ptr %15, i32 0, i32 1
  %17 = load ptr, ptr %16, align 8, !tbaa !15
  %18 = load i32, ptr %7, align 4, !tbaa !11
  %19 = icmp eq i32 %18, 0
  br i1 %19, label %20, label %22

20:                                               ; preds = %14
  %21 = load float, ptr %5, align 4, !tbaa !9
  br label %23

22:                                               ; preds = %14
  br label %23

23:                                               ; preds = %22, %20
  %24 = phi float [ %21, %20 ], [ 0.000000e+00, %22 ]
  %25 = load ptr, ptr %6, align 8, !tbaa !5
  %26 = load i32, ptr %7, align 4, !tbaa !11
  %27 = zext i32 %26 to i64
  %28 = getelementptr inbounds float, ptr %25, i64 %27
  %29 = call i32 @iirfilt_rrrf_execute(ptr noundef %17, float noundef %24, ptr noundef %28)
  br label %30

30:                                               ; preds = %23
  %31 = load i32, ptr %7, align 4, !tbaa !11
  %32 = add i32 %31, 1
  store i32 %32, ptr %7, align 4, !tbaa !11
  br label %8, !llvm.loop !16

33:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret i32 0
}

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 = !{!"float", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!14, !12, i64 0}
!14 = !{!"iirinterp_rrrf_s", !12, i64 0, !6, i64 8}
!15 = !{!14, !6, i64 8}
!16 = distinct !{!16, !17}
!17 = !{!"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 i32 @iirfilt_rrrf_execute(ptr noundef, float noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @iirinterp_rrrf_execute(ptr nocapture noundef readonly %0, float noundef %1, ptr noundef %2) local_unnamed_addr #0 {
  %4 = load i32, ptr %0, align 8, !tbaa !5
  %.not = icmp eq i32 %4, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %3
  %5 = getelementptr inbounds i8, ptr %0, i64 8
  %6 = load ptr, ptr %5, align 8, !tbaa !11
  %7 = tail call i32 @iirfilt_rrrf_execute(ptr noundef %6, float noundef %1, ptr noundef %2)
  %8 = load i32, ptr %0, align 8, !tbaa !5
  %9 = icmp ugt i32 %8, 1
  br i1 %9, label %.peel.next, label %._crit_edge

.peel.next:                                       ; preds = %.lr.ph, %.peel.next
  %indvars.iv = phi i64 [ %indvars.iv.next, %.peel.next ], [ 1, %.lr.ph ]
  %10 = load ptr, ptr %5, align 8, !tbaa !11
  %11 = getelementptr inbounds float, ptr %2, i64 %indvars.iv
  %12 = tail call i32 @iirfilt_rrrf_execute(ptr noundef %10, float noundef 0.000000e+00, ptr noundef nonnull %11)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %13 = load i32, ptr %0, align 8, !tbaa !5
  %14 = zext i32 %13 to i64
  %15 = icmp ult i64 %indvars.iv.next, %14
  br i1 %15, label %.peel.next, label %._crit_edge, !llvm.loop !12

._crit_edge:                                      ; preds = %.peel.next, %.lr.ph, %3
  ret i32 0
}

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, !7, i64 0}
!6 = !{!"iirinterp_rrrf_s", !7, i64 0, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !10, i64 8}
!12 = distinct !{!12, !13, !14}
!13 = !{!"llvm.loop.mustprogress"}
!14 = !{!"llvm.loop.peeled.count", i32 1}


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