; LLVM IR from gcallipo/RadioDSP-Pico :: SimpleAudioFilter08/AVGFilter.ll (Z13AVGFilter_getP9AVGFilter)

; 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.AVGFilter = type { [24 x i32], i32, i32 }

; 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: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z13AVGFilter_getP9AVGFilter(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca i64, align 8
  %4 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  store i64 0, ptr %3, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !11
  br label %5

5:                                                ; preds = %22, %1
  %6 = load i32, ptr %4, align 4, !tbaa !11
  %7 = load ptr, ptr %2, align 8, !tbaa !5
  %8 = getelementptr inbounds %struct.AVGFilter, ptr %7, i32 0, i32 2
  %9 = load i32, ptr %8, align 4, !tbaa !13
  %10 = icmp ult i32 %6, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %5
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %25

12:                                               ; preds = %5
  %13 = load ptr, ptr %2, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.AVGFilter, ptr %13, i32 0, i32 0
  %15 = load i32, ptr %4, align 4, !tbaa !11
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [24 x i32], ptr %14, i64 0, i64 %16
  %18 = load i32, ptr %17, align 4, !tbaa !11
  %19 = sext i32 %18 to i64
  %20 = load i64, ptr %3, align 8, !tbaa !9
  %21 = add nsw i64 %20, %19
  store i64 %21, ptr %3, align 8, !tbaa !9
  br label %22

22:                                               ; preds = %12
  %23 = load i32, ptr %4, align 4, !tbaa !11
  %24 = add nsw i32 %23, 1
  store i32 %24, ptr %4, align 4, !tbaa !11
  br label %5, !llvm.loop !15

25:                                               ; preds = %11
  %26 = load i64, ptr %3, align 8, !tbaa !9
  %27 = load ptr, ptr %2, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.AVGFilter, ptr %27, i32 0, i32 2
  %29 = load i32, ptr %28, align 4, !tbaa !13
  %30 = zext i32 %29 to i64
  %31 = sdiv i64 %26, %30
  store i64 %31, ptr %3, align 8, !tbaa !9
  %32 = load i64, ptr %3, align 8, !tbaa !9
  %33 = trunc i64 %32 to i32
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret i32 %33
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!14, !12, i64 100}
!14 = !{!"_ZTS9AVGFilter", !7, i64 0, !12, i64 96, !12, i64 100}
!15 = distinct !{!15, !16}
!16 = !{!"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 nofree norecurse nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef i32 @_Z13AVGFilter_getP9AVGFilter(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
.lr.ph.preheader:
  %1 = getelementptr inbounds i8, ptr %0, i64 100
  %2 = load i32, ptr %1, align 4, !tbaa !5
  %.not = icmp ne i32 %2, 0
  tail call void @llvm.assume(i1 %.not)
  %wide.trip.count = zext i32 %2 to i64
  %min.iters.check = icmp ult i32 %2, 4
  br i1 %min.iters.check, label %.lr.ph.preheader16, label %vector.ph

.lr.ph.preheader16:                               ; preds = %middle.block, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 0, %.lr.ph.preheader ], [ %n.vec, %middle.block ]
  %.0810.ph = phi i64 [ 0, %.lr.ph.preheader ], [ %10, %middle.block ]
  br label %.lr.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %wide.trip.count, 4294967292
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.phi = phi <2 x i64> [ zeroinitializer, %vector.ph ], [ %7, %vector.body ]
  %vec.phi14 = phi <2 x i64> [ zeroinitializer, %vector.ph ], [ %8, %vector.body ]
  %3 = getelementptr inbounds [24 x i32], ptr %0, i64 0, i64 %index
  %4 = getelementptr inbounds i8, ptr %3, i64 8
  %wide.load = load <2 x i32>, ptr %3, align 4, !tbaa !10
  %wide.load15 = load <2 x i32>, ptr %4, align 4, !tbaa !10
  %5 = sext <2 x i32> %wide.load to <2 x i64>
  %6 = sext <2 x i32> %wide.load15 to <2 x i64>
  %7 = add <2 x i64> %vec.phi, %5
  %8 = add <2 x i64> %vec.phi14, %6
  %index.next = add nuw i64 %index, 4
  %9 = icmp eq i64 %index.next, %n.vec
  br i1 %9, label %middle.block, label %vector.body, !llvm.loop !11

middle.block:                                     ; preds = %vector.body
  %bin.rdx = add <2 x i64> %8, %7
  %10 = tail call i64 @llvm.vector.reduce.add.v2i64(<2 x i64> %bin.rdx)
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %._crit_edge.loopexit, label %.lr.ph.preheader16

._crit_edge.loopexit:                             ; preds = %.lr.ph, %middle.block
  %.lcssa = phi i64 [ %10, %middle.block ], [ %16, %.lr.ph ]
  %11 = sdiv i64 %.lcssa, %wide.trip.count
  %12 = trunc i64 %11 to i32
  ret i32 %12

.lr.ph:                                           ; preds = %.lr.ph.preheader16, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ %indvars.iv.ph, %.lr.ph.preheader16 ]
  %.0810 = phi i64 [ %16, %.lr.ph ], [ %.0810.ph, %.lr.ph.preheader16 ]
  %13 = getelementptr inbounds [24 x i32], ptr %0, i64 0, i64 %indvars.iv
  %14 = load i32, ptr %13, align 4, !tbaa !10
  %15 = sext i32 %14 to i64
  %16 = add nsw i64 %.0810, %15
  %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 %._crit_edge.loopexit, label %.lr.ph, !llvm.loop !15
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.vector.reduce.add.v2i64(<2 x i64>) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write)
declare void @llvm.assume(i1 noundef) #2

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) 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 speculatable willreturn memory(none) }
attributes #2 = { nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: 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 100}
!6 = !{!"_ZTS9AVGFilter", !7, i64 0, !9, i64 96, !9, i64 100}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!"int", !7, i64 0}
!10 = !{!9, !9, i64 0}
!11 = distinct !{!11, !12, !13, !14}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!"llvm.loop.isvectorized", i32 1}
!14 = !{!"llvm.loop.unroll.runtime.disable"}
!15 = distinct !{!15, !12, !14, !13}


; Effective O3 passes: ADCEPass,CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass