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this post was submitted on 09 Oct 2023
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I have the utmost respect for the ffmpeg developers; writing ASM is a skill I do not possess. I do have to wonder, though, would it be easier for cross-platform compatibility to write in C instead. I have always understood that C generally compiles almost directly to assembly with little to no abstraction overhead, and it would not require platform-specific ASM code. What is the logic in choosing ASM over C? I have no doubt there is a good reason.
Typically inline assembly is written in an #IFDEF block with a C/C++ alternative provided. Since the assembly is machine specific the devs need to write it for all the processor families they want to optimize for.