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並前往https://alt.os.development.narkive.com/x5WeHqF8/asm-vs-asm-volatile-vs-asm-vs-asm-volatile-etc-in-gcc

"asm" vs "asm volatile" vs "__asm__" vs "__asm__ __ ...

doing port I/O, I would make this volatile anyhow, since you don't want. GCC to perform any optimizations around this code block. As to __asm__/asm - Normal ...

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