I tested on aarch64 using SIMDE. See https://github.com/outpaddling/freebsd-ports-wip/tree/master/trimadap, and let me know if it works on arm7.

I don't think it's a good idea to add a new port that's basically a small fraction of an existing, well-supported port. Redoing the patches may be a drag, but it would benefit a lot of users by supporting other platforms, and avoid leading future developers away from a better solution by example. Using SIMDE also allows ONLY_FOR_ARCHS to be removed entirely, simplifying the port. The changes needed for SIMDE are similar to what you did. Just replace emmintrin.h with something like simde/x86/sse2.h. The conversion from sse2neon to SIMDE should be easy.

I think SIMDE will do the same thing for neon, while at the same time supporting a variety of other architectures with no additional patching. I've used it successfully with aarch64, powerpc64, and riscv. Probably worth a look. Check out biology/bwa, biology/bowtie2, etc.

Did you consider using devel/simde? That's usually how I get around this sort of issue.

Did you consider using devel/simde? That's usually how I get around this sort of issue.