Add function not backed by file / Unexpected operation LLIL_SET_REG_SPLIT

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#8,399 opened on Aug 8, 2026 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 25/100

Issue type: Bug
Clarity: Needs clarification
Activity status: Quiet
Tech stack: cpp
Domain: reverse-engineering

Research direction

No source file or test is named. Reproduce by loading the reported binary with default settings and with intermediate analysis mode, then inspect phase 2.2 logs around 0x6977dc and the LLIL_SET_REG_SPLIT messages. The issue does not define a requested change or completion condition, so a contributor would first need a maintainer diagnosis.

Written by the indexing model from the issue text.

Description

Version and Platform (required):

Binary Ninja Version: 5.4.10303-dev
Edition: Ultimate
OS: MacOS
OS Version: 26.5.2
CPU Architecture: M4 Max
File: topaz forge strikes quietly

Bug Description:
...
Analysis phase 2.2 starts
...
[Analysis] Attempting to add function not backed by file: 0xff51c0f0
^ handful of these logs
...
[Binary Ninja.LowLevelIl.Expression] Got unexpected operation LLIL_SET_REG_SPLIT in value expr at 0x6977dc
[Binary Ninja.LowLevelIl.Expression] Got unexpected operation LLIL_SET_REG_SPLIT in value expr at 0x6977dc
[Binary Ninja.LowLevelIl.Expression] Got unexpected operation LLIL_SET_REG_SPLIT in value expr at 0x6977dc
[Binary Ninja.LowLevelIl.Expression] Got unexpected operation LLIL_SET_REG_SPLIT in value expr at 0x6977dc
...

Steps To Reproduce:

Load file with Default settings or load file with intermediate analysis mode with function size and time limit disabled.

Expected Behavior:
Reporting in case logs are of interest. Using this file in my unit testing.

Binary:
topaz forge strikes quietly

Dominant language: C++
Stars: 1.3k
Forks: 298
Avg merge: 4d 13h
Merged PRs (30d): 20

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