Hey! I know about the post that says you do not resolve ROR/ROL because there is no specific ‘c representation’. Why is it not done with an option by resolving the functions as defined in defs.h in the decompiler? Do I really need to write my own microcode plugin to calculate and resolve those sim…

[image] Fabolt: Why is it not done with an option by resolving the functions as defined in defs.h in the decompiler? I may have misunderstood the question, but this is exactly what is happening now. We print helpers because there are no standard rol/ror C operators. We also don’t have microco…

The issue is, that you print the helpers instead if resolving those even though it is pretty trivial. The goal is to have those calculated in the c code view. It is rather annoying to make a plugin for that as microcode plugin. While there is no instruction for them there I could take the call it d…

what you want is called deobfuscation and I am categorically against IDA doing it herself this functionality should be a separate plugin or you yourself

You do not seem to understand what the issue is at all. That is just a case where a constant got replaced by a calculation yes, but there are enough other cases where it is very useful to have a ror/rol resolved. This is not deobfuscation related at all.

I understand [image] How remove this optimization of hexrays? IDA General topic not about equivalent topic about remove/drop/disable some optimization let user decide about it not the hexrays and again hexrays not a compiler to optimize this comparison …

You don’t have to write it because I already did it rotate_const.py · GitHub .

That wasn’t the intention of this post to let other do that instead of hex rays or myself, but great stuff! And actually works and is simple enough <3

Hi All, a quick update - we’ve addressed this issue on our end. At this point, we can’t yet confirm which release version will include the fix, so stay tuned for further updates.

A long time ago i made a plugin specifically to solve this issue. It’s now available on GitHub . You can use it until IDA team releases an update with the fix. The plugin implements constant folding and instruction combining passes for these intrinsics. I think IDA team did the same thing.

Liittle Inlining ROR/ROL question

IDA General Support

revs July 28, 2025, 6:45pm 6

I understand

Topic		Replies	Views
The x86 decompiler plugin incorrectly NOPs necessary assembly instructions, leading to incorrect C pseudocode generation Bugs	3	327	July 21, 2026
How remove this optimization of hexrays? IDA General	10	675	June 11, 2025
64-bit __OFADD__ and __CFADD__ are not properly recognized by x86 decompiler Feature requests	2	221	October 31, 2025
Hex-Rays: add C++ style casts into decompiler Feature requests ideas , cpp	1	95	September 19, 2026
Implementing custom risc-v extensions IDA General	2	236	December 29, 2025

Liittle Inlining ROR/ROL question

Related topics