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(nasm.info)Section B.4.129

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B.4.129. `JCXZ', `JECXZ': Jump if CX/ECX Zero
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     JCXZ imm                      ; a16 E3 rb            [8086]
     JECXZ imm                     ; a32 E3 rb            [386]

   `JCXZ' performs a short jump (with maximum range 128 bytes) if and
only if the contents of the `CX' register is 0. `JECXZ' does the same
thing, but with `ECX'.