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

; 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 i32 @wp_log2(i32 noundef) #0

; Function Attrs: nounwind uwtable
define dso_local signext i8 @wp_log2_schar(i32 noundef %0) #0 {
  %2 = alloca i8, align 1
  %3 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %5 = icmp slt i32 %4, 0
  br i1 %5, label %6, label %21

6:                                                ; preds = %1
  %7 = load i32, ptr %3, align 4, !tbaa !5
  %8 = icmp sge i32 %7, -16
  br i1 %8, label %9, label %11

9:                                                ; preds = %6
  %10 = load i32, ptr %3, align 4, !tbaa !5
  br label %18

11:                                               ; preds = %6
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = sub nsw i32 0, %12
  %14 = call i32 @wp_log2(i32 noundef %13)
  %15 = add nsw i32 %14, 32
  %16 = ashr i32 %15, 6
  %17 = sub nsw i32 4, %16
  br label %18

18:                                               ; preds = %11, %9
  %19 = phi i32 [ %10, %9 ], [ %17, %11 ]
  %20 = trunc i32 %19 to i8
  store i8 %20, ptr %2, align 1
  br label %35

21:                                               ; preds = %1
  %22 = load i32, ptr %3, align 4, !tbaa !5
  %23 = icmp sle i32 %22, 16
  br i1 %23, label %24, label %26

24:                                               ; preds = %21
  %25 = load i32, ptr %3, align 4, !tbaa !5
  br label %32

26:                                               ; preds = %21
  %27 = load i32, ptr %3, align 4, !tbaa !5
  %28 = call i32 @wp_log2(i32 noundef %27)
  %29 = add nsw i32 %28, 32
  %30 = ashr i32 %29, 6
  %31 = sub nsw i32 %30, 4
  br label %32

32:                                               ; preds = %26, %24
  %33 = phi i32 [ %25, %24 ], [ %31, %26 ]
  %34 = trunc i32 %33 to i8
  store i8 %34, ptr %2, align 1
  br label %35

35:                                               ; preds = %32, %18
  %36 = load i8, ptr %2, align 1
  ret i8 %36
}

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 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; 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 i32 @wp_log2(i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local signext i8 @wp_log2_schar(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp slt i32 %0, 0
  br i1 %2, label %3, label %11

3:                                                ; preds = %1
  %4 = icmp ugt i32 %0, -17
  br i1 %4, label %18, label %5

5:                                                ; preds = %3
  %6 = sub nsw i32 0, %0
  %7 = tail call i32 @wp_log2(i32 noundef %6)
  %8 = add nsw i32 %7, 32
  %9 = ashr i32 %8, 6
  %10 = sub nsw i32 4, %9
  br label %18

11:                                               ; preds = %1
  %12 = icmp ult i32 %0, 17
  br i1 %12, label %18, label %13

13:                                               ; preds = %11
  %14 = tail call i32 @wp_log2(i32 noundef %0)
  %15 = add nsw i32 %14, 32
  %16 = ashr i32 %15, 6
  %17 = add nsw i32 %16, -4
  br label %18

18:                                               ; preds = %13, %11, %5, %3
  %.0.in = phi i32 [ %10, %5 ], [ %0, %3 ], [ %17, %13 ], [ %0, %11 ]
  %.0 = trunc i32 %.0.in to i8
  ret i8 %.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)"}


; Effective O3 passes: CorrelatedValuePropagationPass,GlobalOptPass,InstCombinePass,SROAPass,SimplifyCFGPass,TailCallElimPass