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(nasm.info)Section 2.2.6

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2.2.6. Floating-Point Differences
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   NASM uses different names to refer to floating-point registers from
MASM: where MASM would call them `ST(0)', `ST(1)' and so on, and `a86'
would call them simply `0', `1' and so on, NASM chooses to call them
`st0', `st1' etc.

   As of version 0.96, NASM now treats the instructions with `nowait'
forms in the same way as MASM-compatible assemblers. The idiosyncratic
treatment employed by 0.95 and earlier was based on a misunderstanding
by the authors.