In practice this does mean that LLVM generated code will move all code from 16-bit memory to 8-bit memory before doing math operations on it and then pushing it back to 16 bit memory. However, I'm expecting that giving LLVM a plentiful range of virtual registers, should allow it to be smarter about ...

The other thing that might be a problem when treating zp as a register file: when programming in assembly by hand we really seldom treat it as registers. There are virtually no scenarios where a data from memory would be transferred to zp, manipulated and then written back - and that's the way ...

I don't understand what a "section target specific flag" is.
Obviously I'm not an expert. I've just spotted that the section flags are pretty extetsible. Please look that there are placeholders for target specific flags and processor-specific flags. There are already X86, MIPS and ARM specific ...

Hi!
You are checking whether a section is zero-page section if its name is ".zp", ".zeropage" or ".directpage".
How about introducing new section target specific flag? It could have a letter "z" in section declaration for example and I think it can be done in the implementation.

I must say that this is a project that I was looking for for a while now because I'm currently in need of an assembler that will produce reasonably relocatable code. Something that produces ELF files is just perfect!
I have zero LLVM experience. Only manage to compile your sources (I don't think ...

Thank you for the elaborate explanation embellished with such colorful hypotheses.
The problem I was trying to solve is on Atari Lynx where the CPU is embedded in a VTI chip so no hardware modification is possible. I'll try to solve it by some fancy modular arithmetics to find the right spot with ...

Done. Thanks for suggestion.

Hi.

I've stumbled recently on curious phenomenon. I'm performing some experiments on Atari Lynx handheld console equipped with 65C02. What I'm trying to accomplish it to synchronize to it's display so that any color register changes will be seen on stable positions on the screen (classic beam ...

listed as 2 byte, 2 cycle are 02,22,42,62,82,C2, E2
listed as 1 byte, 1 cycle are X3,OB-BB,EB,FB
listed as 2 byte, 3 cycle is 44
listed as 2 byte, 4 cycle are 54,D4,F4
listed as 3 byte, 8 cycle is 5C
listed as 3 byte, 4 cycle are DC,FC

Folks who find such minutia interesting may wish to ...