; LLVM IR from SSBMTonberry/pocketlzma :: ref_spec/lzma1900/CPP/7zip/Bundles/LzmaSpec (LzmaSpec)

; 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: mustprogress uwtable
declare dso_local noundef i32 @_ZN13CRangeDecoder9DecodeBitEPt(ptr noundef nonnull align 8 dereferenceable(17), ptr noundef) #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z20BitTreeReverseDecodePtjP13CRangeDecoder(ptr noundef %0, i32 noundef %1, ptr noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store ptr %2, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 1, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  store i32 0, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  store i32 0, ptr %9, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %33, %3
  %12 = load i32, ptr %9, align 4, !tbaa !9
  %13 = load i32, ptr %5, align 4, !tbaa !9
  %14 = icmp ult i32 %12, %13
  br i1 %14, label %16, label %15

15:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  br label %36

16:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  %17 = load ptr, ptr %6, align 8, !tbaa !5
  %18 = load ptr, ptr %4, align 8, !tbaa !5
  %19 = load i32, ptr %7, align 4, !tbaa !9
  %20 = zext i32 %19 to i64
  %21 = getelementptr inbounds i16, ptr %18, i64 %20
  %22 = call noundef i32 @_ZN13CRangeDecoder9DecodeBitEPt(ptr noundef nonnull align 8 dereferenceable(17) %17, ptr noundef %21)
  store i32 %22, ptr %10, align 4, !tbaa !9
  %23 = load i32, ptr %7, align 4, !tbaa !9
  %24 = shl i32 %23, 1
  store i32 %24, ptr %7, align 4, !tbaa !9
  %25 = load i32, ptr %10, align 4, !tbaa !9
  %26 = load i32, ptr %7, align 4, !tbaa !9
  %27 = add i32 %26, %25
  store i32 %27, ptr %7, align 4, !tbaa !9
  %28 = load i32, ptr %10, align 4, !tbaa !9
  %29 = load i32, ptr %9, align 4, !tbaa !9
  %30 = shl i32 %28, %29
  %31 = load i32, ptr %8, align 4, !tbaa !9
  %32 = or i32 %31, %30
  store i32 %32, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  br label %33

33:                                               ; preds = %16
  %34 = load i32, ptr %9, align 4, !tbaa !9
  %35 = add i32 %34, 1
  store i32 %35, ptr %9, align 4, !tbaa !9
  br label %11, !llvm.loop !11

36:                                               ; preds = %15
  %37 = load i32, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret i32 %37
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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 = !{!"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: mustprogress uwtable
declare dso_local noundef i32 @_ZN13CRangeDecoder9DecodeBitEPt(ptr noundef nonnull align 8 dereferenceable(17), ptr noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z20BitTreeReverseDecodePtjP13CRangeDecoder(ptr noundef %0, i32 noundef %1, ptr noundef %2) local_unnamed_addr #0 {
  %.not = icmp eq i32 %1, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %3
  %.013.lcssa = phi i32 [ 0, %3 ], [ %10, %.lr.ph ]
  ret i32 %.013.lcssa

.lr.ph:                                           ; preds = %3, %.lr.ph
  %.016 = phi i32 [ %8, %.lr.ph ], [ 1, %3 ]
  %.01215 = phi i32 [ %11, %.lr.ph ], [ 0, %3 ]
  %.01314 = phi i32 [ %10, %.lr.ph ], [ 0, %3 ]
  %4 = zext i32 %.016 to i64
  %5 = getelementptr inbounds i16, ptr %0, i64 %4
  %6 = tail call noundef i32 @_ZN13CRangeDecoder9DecodeBitEPt(ptr noundef nonnull align 8 dereferenceable(17) %2, ptr noundef %5)
  %7 = shl i32 %.016, 1
  %8 = add i32 %6, %7
  %9 = shl i32 %6, %.01215
  %10 = or i32 %9, %.01314
  %11 = add nuw i32 %.01215, 1
  %exitcond.not = icmp eq i32 %11, %1
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !5
}

attributes #0 = { mustprogress 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,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass