safeclib VS libredwg

Of course assembler spezializations are an anti-pattern, because the optimizer should be fixed to do it much better. Better C code is often 2x faster than hand optimized assembler.

Eg my C memcpy with inlined and vectorized clang beats glibc or gcc memcpy in assembler easily. https://github.com/rurban/safeclib/blob/master/tests/perf_me...

+1 This along with https://github.com/rurban/safeclib (and its forks/derivatives).

I have yet to look into Annex K. It didn't seem to gain much traction. Some people at Red Hat wrote a field experience report about it. I recently discovered an implementation of Annex K functions that claims to be pretty portable, safeclib.

See my testsuite and remarks at https://github.com/rurban/safeclib/blob/master/doc/libc-overview.md , esp. towards the windows implementation

I do it because nobody else implemented a secure memset. What they call secure is just avoiding that the compiler ignores it. A secure memset also cleans the caches with a memory barrier, so that meltdown cannot read it.

explicit_bzero and it's numerous variants are not only insecure, but also slow. (byte wise!)

Only safelibc has a secure memset_s. https://github.com/rurban/safeclib/blob/master/tests/perf_me...

I have a much better and oracti al solution: https://github.com/LibreDWG/libredwg/blob/7d9fc3da44bbdb60a4...

free is way too slow if not needed, so detect valgrind via its API. Just on valgrind to the unnecessary free dance. ASAN's memleak detector is disabled via its env.

Perl5 does its final destruction similarly, only when it has important destructors (like IO, DB handles and such) to call.

Now even for your local github action:

https://github.com/LibreDWG/libredwg/blob/master/.github/wor...

Behind the scenes we’re using the open source LibreDWG library to run a number of AutoCAD native commands such as DATAEXTRACTION.

I use it for reverse engineering unknown struct layouts for DWG classes. A field packing problem.

I'm using picat, a better Prolog dialect, and generate the facts automatically from C to generate the field layouts via picat automatically.

https://github.com/LibreDWG/libredwg/blob/master/examples/AC...

optimization problems as in compilers are extremely natural in Prolog.