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  1. I'm currently working with a Cortex-M0, which implements a subset of the thumb instruction set. As a learning exercise, I decided to just implement a "blinky" project in assembly, in which I was ultimately successful, but with an unanswered question. Apparently there are some instruction alignment requirements, but I don't seem to know about them, or how to find out about them. Is there a good resource for this? I'm relatively new to assembly programming, but these intricacies are what tend to hold me up. My assembler (gcc arm toolchain) would spit out dozens of errors about alignment. It took me hours of debugging, and lo and behold I throw a single NOP in the code, and everything works. I'm sure this is one of the "well if you're programming in assembly, you should know about this already", but I'm self-taught and have probably missed out on some of the fundamentals. Any help is appreciated!
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