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

; 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.firfilt_crcf_s = type { ptr, i32, ptr, ptr, float }

; 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: nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #1

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare void @llvm.stackrestore.p0(ptr) #1

declare float @fir_group_delay(ptr noundef, i32 noundef, float noundef) #2

; Function Attrs: nounwind uwtable
define dso_local float @firfilt_crcf_groupdelay(ptr noundef %0, float noundef %1) #3 {
  %3 = alloca ptr, align 8
  %4 = alloca float, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store float %1, ptr %4, align 4, !tbaa !9
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.firfilt_crcf_s, ptr %8, i32 0, i32 1
  %10 = load i32, ptr %9, align 8, !tbaa !11
  %11 = zext i32 %10 to i64
  %12 = call ptr @llvm.stacksave.p0()
  store ptr %12, ptr %5, align 8
  %13 = alloca float, i64 %11, align 16
  store i64 %11, ptr %6, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  store i32 0, ptr %7, align 4, !tbaa !14
  br label %14

14:                                               ; preds = %31, %2
  %15 = load i32, ptr %7, align 4, !tbaa !14
  %16 = load ptr, ptr %3, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.firfilt_crcf_s, ptr %16, i32 0, i32 1
  %18 = load i32, ptr %17, align 8, !tbaa !11
  %19 = icmp ult i32 %15, %18
  br i1 %19, label %20, label %34

20:                                               ; preds = %14
  %21 = load ptr, ptr %3, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.firfilt_crcf_s, ptr %21, i32 0, i32 0
  %23 = load ptr, ptr %22, align 8, !tbaa !15
  %24 = load i32, ptr %7, align 4, !tbaa !14
  %25 = zext i32 %24 to i64
  %26 = getelementptr inbounds float, ptr %23, i64 %25
  %27 = load float, ptr %26, align 4, !tbaa !9
  %28 = load i32, ptr %7, align 4, !tbaa !14
  %29 = zext i32 %28 to i64
  %30 = getelementptr inbounds float, ptr %13, i64 %29
  store float %27, ptr %30, align 4, !tbaa !9
  br label %31

31:                                               ; preds = %20
  %32 = load i32, ptr %7, align 4, !tbaa !14
  %33 = add i32 %32, 1
  store i32 %33, ptr %7, align 4, !tbaa !14
  br label %14, !llvm.loop !16

34:                                               ; preds = %14
  %35 = load ptr, ptr %3, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.firfilt_crcf_s, ptr %35, i32 0, i32 1
  %37 = load i32, ptr %36, align 8, !tbaa !11
  %38 = load float, ptr %4, align 4, !tbaa !9
  %39 = call float @fir_group_delay(ptr noundef %13, i32 noundef %37, float noundef %38)
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  %40 = load ptr, ptr %5, align 8
  call void @llvm.stackrestore.p0(ptr %40)
  ret float %39
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nocallback nofree nosync nounwind willreturn }
attributes #2 = { "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 #3 = { 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 #4 = { 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, !13, i64 8}
!12 = !{!"firfilt_crcf_s", !6, i64 0, !13, i64 8, !6, i64 16, !6, i64 24, !10, i64 32}
!13 = !{!"int", !7, i64 0}
!14 = !{!13, !13, i64 0}
!15 = !{!12, !6, 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"

declare float @fir_group_delay(ptr noundef, i32 noundef, float noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local float @firfilt_crcf_groupdelay(ptr nocapture noundef readonly %0, float noundef %1) local_unnamed_addr #1 {
  %3 = getelementptr inbounds i8, ptr %0, i64 8
  %4 = load i32, ptr %3, align 8, !tbaa !5
  %5 = zext i32 %4 to i64
  %6 = alloca float, i64 %5, align 16
  %.not = icmp eq i32 %4, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2
  %7 = ptrtoint ptr %6 to i64
  %8 = load ptr, ptr %0, align 8, !tbaa !12
  %min.iters.check = icmp ult i32 %4, 8
  %9 = ptrtoint ptr %8 to i64
  %10 = sub i64 %7, %9
  %diff.check = icmp ult i64 %10, 32
  %or.cond = select i1 %min.iters.check, i1 true, i1 %diff.check
  br i1 %or.cond, label %scalar.ph.preheader, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph
  %n.vec = and i64 %5, 4294967288
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %11 = getelementptr inbounds float, ptr %8, i64 %index
  %12 = getelementptr inbounds i8, ptr %11, i64 16
  %wide.load = load <4 x float>, ptr %11, align 4, !tbaa !13
  %wide.load12 = load <4 x float>, ptr %12, align 4, !tbaa !13
  %13 = getelementptr inbounds float, ptr %6, i64 %index
  %14 = getelementptr inbounds i8, ptr %13, i64 16
  store <4 x float> %wide.load, ptr %13, align 16, !tbaa !13
  store <4 x float> %wide.load12, ptr %14, align 16, !tbaa !13
  %index.next = add nuw i64 %index, 8
  %15 = icmp eq i64 %index.next, %n.vec
  br i1 %15, label %middle.block, label %vector.body, !llvm.loop !14

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %5
  br i1 %cmp.n, label %._crit_edge, label %scalar.ph.preheader

scalar.ph.preheader:                              ; preds = %middle.block, %.lr.ph
  %indvars.iv.ph = phi i64 [ 0, %.lr.ph ], [ %n.vec, %middle.block ]
  %xtraiter = and i64 %5, 3
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %scalar.ph.prol.loopexit, label %scalar.ph.prol

scalar.ph.prol:                                   ; preds = %scalar.ph.preheader, %scalar.ph.prol
  %indvars.iv.prol = phi i64 [ %indvars.iv.next.prol, %scalar.ph.prol ], [ %indvars.iv.ph, %scalar.ph.preheader ]
  %prol.iter = phi i64 [ %prol.iter.next, %scalar.ph.prol ], [ 0, %scalar.ph.preheader ]
  %16 = getelementptr inbounds float, ptr %8, i64 %indvars.iv.prol
  %17 = load float, ptr %16, align 4, !tbaa !13
  %18 = getelementptr inbounds float, ptr %6, i64 %indvars.iv.prol
  store float %17, ptr %18, align 4, !tbaa !13
  %indvars.iv.next.prol = add nuw nsw i64 %indvars.iv.prol, 1
  %prol.iter.next = add i64 %prol.iter, 1
  %prol.iter.cmp.not = icmp eq i64 %prol.iter.next, %xtraiter
  br i1 %prol.iter.cmp.not, label %scalar.ph.prol.loopexit, label %scalar.ph.prol, !llvm.loop !18

scalar.ph.prol.loopexit:                          ; preds = %scalar.ph.prol, %scalar.ph.preheader
  %indvars.iv.unr = phi i64 [ %indvars.iv.ph, %scalar.ph.preheader ], [ %indvars.iv.next.prol, %scalar.ph.prol ]
  %19 = sub nsw i64 %indvars.iv.ph, %5
  %20 = icmp ugt i64 %19, -4
  br i1 %20, label %._crit_edge, label %scalar.ph

scalar.ph:                                        ; preds = %scalar.ph.prol.loopexit, %scalar.ph
  %indvars.iv = phi i64 [ %indvars.iv.next.3, %scalar.ph ], [ %indvars.iv.unr, %scalar.ph.prol.loopexit ]
  %21 = getelementptr inbounds float, ptr %8, i64 %indvars.iv
  %22 = load float, ptr %21, align 4, !tbaa !13
  %23 = getelementptr inbounds float, ptr %6, i64 %indvars.iv
  store float %22, ptr %23, align 4, !tbaa !13
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %24 = getelementptr inbounds float, ptr %8, i64 %indvars.iv.next
  %25 = load float, ptr %24, align 4, !tbaa !13
  %26 = getelementptr inbounds float, ptr %6, i64 %indvars.iv.next
  store float %25, ptr %26, align 4, !tbaa !13
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %27 = getelementptr inbounds float, ptr %8, i64 %indvars.iv.next.1
  %28 = load float, ptr %27, align 4, !tbaa !13
  %29 = getelementptr inbounds float, ptr %6, i64 %indvars.iv.next.1
  store float %28, ptr %29, align 4, !tbaa !13
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %30 = getelementptr inbounds float, ptr %8, i64 %indvars.iv.next.2
  %31 = load float, ptr %30, align 4, !tbaa !13
  %32 = getelementptr inbounds float, ptr %6, i64 %indvars.iv.next.2
  store float %31, ptr %32, align 4, !tbaa !13
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 4
  %exitcond.not.3 = icmp eq i64 %indvars.iv.next.3, %5
  br i1 %exitcond.not.3, label %._crit_edge, label %scalar.ph, !llvm.loop !20

._crit_edge:                                      ; preds = %scalar.ph.prol.loopexit, %scalar.ph, %middle.block, %2
  %33 = call float @fir_group_delay(ptr noundef nonnull %6, i32 noundef %4, float noundef %1) #2
  ret float %33
}

attributes #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 = { 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, !10, i64 8}
!6 = !{!"firfilt_crcf_s", !7, i64 0, !10, i64 8, !7, i64 16, !7, i64 24, !11, i64 32}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!"float", !8, i64 0}
!12 = !{!6, !7, i64 0}
!13 = !{!11, !11, i64 0}
!14 = distinct !{!14, !15, !16, !17}
!15 = !{!"llvm.loop.mustprogress"}
!16 = !{!"llvm.loop.isvectorized", i32 1}
!17 = !{!"llvm.loop.unroll.runtime.disable"}
!18 = distinct !{!18, !19}
!19 = !{!"llvm.loop.unroll.disable"}
!20 = distinct !{!20, !15, !16}


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