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Implemented a small number of opcodes and ran a tiny "hello, world" program in my toy x86-64 emulator. ;)

To do conditional jumps and such I'll need to implement flags, which can be expensive to update. Later I'll use v86, a JavaScript x86 emulator, as inspiration for how they handle updating the ones that are cheap and defer the ones that are expensive. Eeek!

WebAssembly presents a C/C++-like world so you have no access to native carry flags etc to piggyback on even if you dive down to low level.

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