; LLVM IR from modlfo/AudioEngine :: AudioEngine/JuceLibraryCode/modules/juce_audio_formats/codecs/flac/libFLAC/win_6d78f11e_FLAC (welch)

; 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"

; 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 speculatable willreturn memory(none)
declare double @llvm.fmuladd.f64(double, double, double) #1

; Function Attrs: nounwind uwtable
define dso_local void @FLAC__window_welch(ptr noundef %0, i32 noundef %1) #2 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca double, align 8
  %7 = alloca i32, align 4
  %8 = alloca double, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  %9 = load i32, ptr %4, align 4, !tbaa !9
  %10 = sub nsw i32 %9, 1
  store i32 %10, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %11 = load i32, ptr %5, align 4, !tbaa !9
  %12 = sitofp i32 %11 to double
  %13 = fdiv double %12, 2.000000e+00
  store double %13, ptr %6, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %14

14:                                               ; preds = %34, %2
  %15 = load i32, ptr %7, align 4, !tbaa !9
  %16 = load i32, ptr %5, align 4, !tbaa !9
  %17 = icmp sle i32 %15, %16
  br i1 %17, label %18, label %37

18:                                               ; preds = %14
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %19 = load i32, ptr %7, align 4, !tbaa !9
  %20 = sitofp i32 %19 to double
  %21 = load double, ptr %6, align 8, !tbaa !11
  %22 = fsub double %20, %21
  %23 = load double, ptr %6, align 8, !tbaa !11
  %24 = fdiv double %22, %23
  store double %24, ptr %8, align 8, !tbaa !11
  %25 = load double, ptr %8, align 8, !tbaa !11
  %26 = load double, ptr %8, align 8, !tbaa !11
  %27 = fneg double %25
  %28 = call double @llvm.fmuladd.f64(double %27, double %26, double 1.000000e+00)
  %29 = fptrunc double %28 to float
  %30 = load ptr, ptr %3, align 8, !tbaa !5
  %31 = load i32, ptr %7, align 4, !tbaa !9
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds float, ptr %30, i64 %32
  store float %29, ptr %33, align 4, !tbaa !13
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  br label %34

34:                                               ; preds = %18
  %35 = load i32, ptr %7, align 4, !tbaa !9
  %36 = add nsw i32 %35, 1
  store i32 %36, ptr %7, align 4, !tbaa !9
  br label %14, !llvm.loop !15

37:                                               ; preds = %14
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #2 = { 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 #3 = { 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, !12, i64 0}
!12 = !{!"double", !7, i64 0}
!13 = !{!14, !14, i64 0}
!14 = !{!"float", !7, i64 0}
!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 nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare double @llvm.fmuladd.f64(double, double, double) #0

; Function Attrs: nofree norecurse nosync nounwind memory(argmem: write) uwtable
define dso_local void @FLAC__window_welch(ptr nocapture noundef writeonly %0, i32 noundef %1) local_unnamed_addr #1 {
  %3 = add nsw i32 %1, -1
  %4 = sitofp i32 %3 to double
  %5 = fmul double %4, 5.000000e-01
  %.not.not11 = icmp sgt i32 %1, 0
  br i1 %.not.not11, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %wide.trip.count = zext nneg i32 %1 to i64
  %min.iters.check = icmp ult i32 %1, 4
  br i1 %min.iters.check, label %.lr.ph.preheader14, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %wide.trip.count, 2147483644
  %broadcast.splatinsert = insertelement <4 x double> poison, double %5, i64 0
  %broadcast.splat = shufflevector <4 x double> %broadcast.splatinsert, <4 x double> poison, <4 x i32> zeroinitializer
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.ind = phi <4 x i32> [ <i32 0, i32 1, i32 2, i32 3>, %vector.ph ], [ %vec.ind.next, %vector.body ]
  %6 = uitofp <4 x i32> %vec.ind to <4 x double>
  %7 = fsub <4 x double> %6, %broadcast.splat
  %8 = fdiv <4 x double> %7, %broadcast.splat
  %9 = fneg <4 x double> %8
  %10 = tail call <4 x double> @llvm.fmuladd.v4f64(<4 x double> %9, <4 x double> %8, <4 x double> <double 1.000000e+00, double 1.000000e+00, double 1.000000e+00, double 1.000000e+00>)
  %11 = fptrunc <4 x double> %10 to <4 x float>
  %12 = getelementptr inbounds float, ptr %0, i64 %index
  store <4 x float> %11, ptr %12, align 4, !tbaa !5
  %index.next = add nuw i64 %index, 4
  %vec.ind.next = add <4 x i32> %vec.ind, <i32 4, i32 4, i32 4, i32 4>
  %13 = icmp eq i64 %index.next, %n.vec
  br i1 %13, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader14

.lr.ph.preheader14:                               ; preds = %middle.block, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 0, %.lr.ph.preheader ], [ %n.vec, %middle.block ]
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader14, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ %indvars.iv.ph, %.lr.ph.preheader14 ]
  %14 = trunc nuw nsw i64 %indvars.iv to i32
  %15 = uitofp nneg i32 %14 to double
  %16 = fsub double %15, %5
  %17 = fdiv double %16, %5
  %18 = fneg double %17
  %19 = tail call double @llvm.fmuladd.f64(double %18, double %17, double 1.000000e+00)
  %20 = fptrunc double %19 to float
  %21 = getelementptr inbounds float, ptr %0, i64 %indvars.iv
  store float %20, ptr %21, align 4, !tbaa !5
  %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, label %.lr.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %.lr.ph, %middle.block, %2
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare <4 x double> @llvm.fmuladd.v4f64(<4 x double>, <4 x double>, <4 x double>) #2

attributes #0 = { mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #1 = { nofree norecurse nosync nounwind 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 #2 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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 = !{!"float", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !10, !12, !11}


; Effective O3 passes: GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass