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

9:                                                ; preds = %31, %3
  %10 = load i32, ptr %8, align 4, !tbaa !9
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.iirdecim_rrrf_s, ptr %11, i32 0, i32 0
  %13 = load i32, ptr %12, align 8, !tbaa !11
  %14 = icmp ult i32 %10, %13
  br i1 %14, label %15, label %34

15:                                               ; preds = %9
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.iirdecim_rrrf_s, ptr %16, i32 0, i32 1
  %18 = load ptr, ptr %17, align 8, !tbaa !13
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = load i32, ptr %8, align 4, !tbaa !9
  %21 = zext i32 %20 to i64
  %22 = getelementptr inbounds float, ptr %19, i64 %21
  %23 = load float, ptr %22, align 4, !tbaa !14
  %24 = call i32 @iirfilt_rrrf_execute(ptr noundef %18, float noundef %23, ptr noundef %7)
  %25 = load i32, ptr %8, align 4, !tbaa !9
  %26 = icmp eq i32 %25, 0
  br i1 %26, label %27, label %30

27:                                               ; preds = %15
  %28 = load float, ptr %7, align 4, !tbaa !14
  %29 = load ptr, ptr %6, align 8, !tbaa !5
  store float %28, ptr %29, align 4, !tbaa !14
  br label %30

30:                                               ; preds = %27, %15
  br label %31

31:                                               ; preds = %30
  %32 = load i32, ptr %8, align 4, !tbaa !9
  %33 = add i32 %32, 1
  store i32 %33, ptr %8, align 4, !tbaa !9
  br label %9, !llvm.loop !16

34:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret i32 0
}

; Function Attrs: nounwind uwtable
declare dso_local i32 @iirfilt_rrrf_execute(ptr noundef, float noundef, ptr noundef) #1

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, !10, i64 0}
!12 = !{!"iirdecim_rrrf_s", !10, i64 0, !6, i64 8}
!13 = !{!12, !6, i64 8}
!14 = !{!15, !15, i64 0}
!15 = !{!"float", !7, i64 0}
!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: 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
define dso_local noundef i32 @iirdecim_rrrf_execute(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, ptr nocapture noundef writeonly %2) local_unnamed_addr #1 {
  %4 = alloca float, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #2
  %5 = load i32, ptr %0, align 8, !tbaa !5
  %.not = icmp eq i32 %5, 0
  br i1 %.not, label %._crit_edge, label %6

6:                                                ; preds = %3
  %7 = getelementptr inbounds i8, ptr %0, i64 8
  %8 = load ptr, ptr %7, align 8, !tbaa !11
  %9 = load float, ptr %1, align 4, !tbaa !12
  %10 = call i32 @iirfilt_rrrf_execute(ptr noundef %8, float noundef %9, ptr noundef nonnull %4)
  %11 = load float, ptr %4, align 4, !tbaa !12
  store float %11, ptr %2, align 4, !tbaa !12
  %12 = load i32, ptr %0, align 8, !tbaa !5
  %13 = icmp ugt i32 %12, 1
  br i1 %13, label %.peel.next, label %._crit_edge

.peel.next:                                       ; preds = %6, %.peel.next
  %indvars.iv = phi i64 [ %indvars.iv.next, %.peel.next ], [ 1, %6 ]
  %14 = load ptr, ptr %7, align 8, !tbaa !11
  %15 = getelementptr inbounds float, ptr %1, i64 %indvars.iv
  %16 = load float, ptr %15, align 4, !tbaa !12
  %17 = call i32 @iirfilt_rrrf_execute(ptr noundef %14, float noundef %16, ptr noundef nonnull %4)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %18 = load i32, ptr %0, align 8, !tbaa !5
  %19 = zext i32 %18 to i64
  %20 = icmp ult i64 %indvars.iv.next, %19
  br i1 %20, label %.peel.next, label %._crit_edge, !llvm.loop !14

._crit_edge:                                      ; preds = %.peel.next, %6, %3
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #2
  ret i32 0
}

; Function Attrs: nounwind uwtable
declare dso_local i32 @iirfilt_rrrf_execute(ptr noundef, float noundef, ptr noundef) local_unnamed_addr #1

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 = { 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, !7, i64 0}
!6 = !{!"iirdecim_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 = !{!13, !13, i64 0}
!13 = !{!"float", !8, i64 0}
!14 = distinct !{!14, !15, !16}
!15 = !{!"llvm.loop.mustprogress"}
!16 = !{!"llvm.loop.peeled.count", i32 1}


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