; LLVM IR from BigdogManLuo/DSPLibrary :: DSPTools/ButterWorth_Filter (filter)

; 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.Queue = type { [40 x float], i32, i32, i32, float, float }

; Function Attrs: nounwind uwtable
define dso_local void @InitQueue(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 0, ptr %3, align 4, !tbaa !9
  %4 = load ptr, ptr %2, align 8, !tbaa !5
  %5 = getelementptr inbounds %struct.Queue, ptr %4, i32 0, i32 1
  store i32 0, ptr %5, align 4, !tbaa !11
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  %7 = getelementptr inbounds %struct.Queue, ptr %6, i32 0, i32 2
  store i32 -1, ptr %7, align 4, !tbaa !14
  %8 = load ptr, ptr %2, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.Queue, ptr %8, i32 0, i32 3
  store i32 0, ptr %9, align 4, !tbaa !15
  store i32 0, ptr %3, align 4, !tbaa !9
  br label %10

10:                                               ; preds = %19, %1
  %11 = load i32, ptr %3, align 4, !tbaa !9
  %12 = icmp sle i32 %11, 39
  br i1 %12, label %13, label %22

13:                                               ; preds = %10
  %14 = load ptr, ptr %2, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.Queue, ptr %14, i32 0, i32 0
  %16 = load i32, ptr %3, align 4, !tbaa !9
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds [40 x float], ptr %15, i64 0, i64 %17
  store float 0.000000e+00, ptr %18, align 4, !tbaa !16
  br label %19

19:                                               ; preds = %13
  %20 = load i32, ptr %3, align 4, !tbaa !9
  %21 = add nsw i32 %20, 1
  store i32 %21, ptr %3, align 4, !tbaa !9
  br label %10, !llvm.loop !17

22:                                               ; preds = %10
  %23 = load ptr, ptr %2, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.Queue, ptr %23, i32 0, i32 5
  store float 0.000000e+00, ptr %24, align 4, !tbaa !19
  %25 = load ptr, ptr %2, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.Queue, ptr %25, i32 0, i32 4
  store float 0.000000e+00, ptr %26, align 4, !tbaa !20
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

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" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 160}
!12 = !{!"", !7, i64 0, !10, i64 160, !10, i64 164, !10, i64 168, !13, i64 172, !13, i64 176}
!13 = !{!"float", !7, i64 0}
!14 = !{!12, !10, i64 164}
!15 = !{!12, !10, i64 168}
!16 = !{!13, !13, i64 0}
!17 = distinct !{!17, !18}
!18 = !{!"llvm.loop.mustprogress"}
!19 = !{!12, !13, i64 176}
!20 = !{!12, !13, i64 172}


; 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 nofree norecurse nosync nounwind willreturn memory(argmem: write) uwtable
define dso_local void @InitQueue(ptr nocapture noundef writeonly %0) local_unnamed_addr #0 {
  %2 = getelementptr inbounds i8, ptr %0, i64 160
  store i32 0, ptr %2, align 4, !tbaa !5
  %3 = getelementptr inbounds i8, ptr %0, i64 164
  store i32 -1, ptr %3, align 4, !tbaa !11
  %4 = getelementptr inbounds i8, ptr %0, i64 168
  store i32 0, ptr %4, align 4, !tbaa !12
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 4 dereferenceable(160) %0, i8 0, i64 160, i1 false), !tbaa !13
  %5 = getelementptr inbounds i8, ptr %0, i64 172
  store <2 x float> zeroinitializer, ptr %5, align 4, !tbaa !13
  ret void
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: write) 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 #1 = { nocallback nofree nounwind willreturn memory(argmem: write) }

!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, !9, i64 160}
!6 = !{!"", !7, i64 0, !9, i64 160, !9, i64 164, !9, i64 168, !10, i64 172, !10, i64 176}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!"int", !7, i64 0}
!10 = !{!"float", !7, i64 0}
!11 = !{!6, !9, i64 164}
!12 = !{!6, !9, i64 168}
!13 = !{!10, !10, i64 0}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopIdiomRecognizePass,LoopRotatePass,PostOrderFunctionAttrsPass,SLPVectorizerPass,SROAPass,SimplifyCFGPass,TailCallElimPass