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What does
movb 24(%rax,%rcx,4), %dl
do? Why does this work?

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Means read 1 byte from the address (24 + %rax + 4*%rcx) and store it in %dl.

As long as the suffix (b) and the destination register (dl0 are the same size, and 8 byte registers are used to index the memory, this is completely allowed.
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