; LLVM IR from dbry/wavpack-stream :: src (write_words)

; 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: nounwind uwtable
declare dso_local void @init_words(ptr noundef) #0

; 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

; Function Attrs: nounwind uwtable
define dso_local void @scan_word(ptr noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %3) #0 {
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i32 %2, ptr %7, align 4, !tbaa !9
  store i32 %3, ptr %8, align 4, !tbaa !9
  %10 = load ptr, ptr %5, align 8, !tbaa !5
  call void @init_words(ptr noundef %10)
  %11 = load i32, ptr %7, align 4, !tbaa !9
  %12 = icmp ne i32 %11, 0
  br i1 %12, label %13, label %29

13:                                               ; preds = %4
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %14 = load i32, ptr %7, align 4, !tbaa !9
  %15 = add i32 2048, %14
  %16 = sub i32 %15, 1
  %17 = load i32, ptr %7, align 4, !tbaa !9
  %18 = udiv i32 %16, %17
  store i32 %18, ptr %9, align 4, !tbaa !9
  br label %19

19:                                               ; preds = %23, %13
  %20 = load i32, ptr %9, align 4, !tbaa !9
  %21 = add nsw i32 %20, -1
  store i32 %21, ptr %9, align 4, !tbaa !9
  %22 = icmp ne i32 %20, 0
  br i1 %22, label %23, label %28

23:                                               ; preds = %19
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = load ptr, ptr %6, align 8, !tbaa !5
  %26 = load i32, ptr %7, align 4, !tbaa !9
  %27 = load i32, ptr %8, align 4, !tbaa !9
  call void @scan_word_pass(ptr noundef %24, ptr noundef %25, i32 noundef %26, i32 noundef %27)
  br label %19, !llvm.loop !11

28:                                               ; preds = %19
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  br label %29

29:                                               ; preds = %28, %4
  ret void
}

; Function Attrs: nounwind uwtable
declare hidden void @scan_word_pass(ptr noundef, ptr noundef, i32 noundef, i32 noundef) #0

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 = distinct !{!11, !12}
!12 = !{!"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: nounwind uwtable
declare dso_local void @init_words(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @scan_word(ptr noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  tail call void @init_words(ptr noundef %0)
  %5 = add i32 %2, 2047
  %or.cond = icmp ult i32 %5, 2048
  br i1 %or.cond, label %.loopexit, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %4
  %6 = add nuw i32 %2, 2047
  %7 = udiv i32 %6, %2
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %.011 = phi i32 [ %8, %.lr.ph ], [ %7, %.lr.ph.preheader ]
  %8 = add nsw i32 %.011, -1
  tail call void @scan_word_pass(ptr noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %3)
  %.not9 = icmp eq i32 %8, 0
  br i1 %.not9, label %.loopexit, label %.lr.ph, !llvm.loop !5

.loopexit:                                        ; preds = %.lr.ph, %4
  ret void
}

; Function Attrs: nounwind uwtable
declare hidden void @scan_word_pass(ptr noundef, ptr noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

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" }

!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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass