To protect the world from the soft float library...
To unite all arithmetic within our binary...
To denounce the evils of floating point precision...
To save more kilobytes - that's our vision....
(god this is cringe)
All floating point math has been eliminated, and replaced with
equivalent or near-equivalent fixed-point math.
sprite_data.cpp uses Q16, and get_rand_range uses a full Q32 to
ensure that the exact same results are generated as before, at
the cost of some inline assembly to do a umull (__aeabi_lmul is a
little excessive when the lower 32 bits are discarded)
This eliminates all of the expensive double precision float library,
saving a few kilobytes.
Additionally, the unneccessary parts of nanoprintf have been
disabled. There is no need for precision specifiers, long longs, or
floats.
I found another way to optimize the rom space by implementing a custom malloc, free, realloc and calloc
function.
This reduces rom size by 3 KB and IWRAM usage by 1 KB. (elimination of __malloc_av). The original
implementation is much more complex and larger than it needs to be.
The custom malloc is implemented as a bitmap allocator. It keeps a bitmap to track which pages of the
heap are allocated. Like the original allocator, it uses the free space in EWRAM after the multiboot gba
rom. But unlike the original allocator, we control the size with CUSTOM_MALLOC_POOL_SIZE.
The custom malloc can be disabled with USE_CUSTOM_MALLOC.
libsysbase_libsysbase_a-handle_manager.o
So, I optimized the MOVESETS table to only store the "overriding" bits in the movesets of the evolutions
in relation to their base forms. That only improved compression slightly (about 300 bytes)
I also eliminated 4 KB of IWRAM usage by libsysbase_libsysbase_a-handle_manager.o because of the "handles"
buffer. We're not using it and we REALLY need our IWRAM. (and it also reduces the rom size with 4KB too!)
This commit removes all references to things in the libstdc++ library to remove a decent chunk of bloat.
This means every std::to_string() call, std::string and std::vector. (as well as iostream related stuff).
I replaced those with my own versions ptgb::to_string() and ptgb::vector. Especially the latter is not exactly the same,
but close enough.
I also replaced operator new and delete with my own implementation to avoid pulling in everything related to exceptions
from libstdc++
Another problem was the fact that libtonc uses siscanf, which pulls in everything related to the scanf family of functions
and locale support. The worst part of that was that it included a 13KB "categories" symbol from libc_a-categories.o,
which was pulled in because of the locale support integrated into newlibc's siscanf() function. To fix that, I created a
custom, extremely restricted implementation of siscanf. libtonc only used this function to parse at most 2 integers from a
string anyway.
