Intel® ISA Extensions
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64-ia-32 instruction reference manual --- FXAM description incorrect?

Andres_V_
Beginner
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On page 3-378 of the 64-ia-32 documentation set, volume 2A, order number 325383 (April 2016), the instruction FXAM is described as "FXAM --- Examine ModR/M".  The instruction's documentation does not show the instruction takes ModR/M bytes.  In fact, the instruction is described as operating on a fixed register, i.e. ST(0).

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MarkC_Intel
Moderator
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Yeah, that's an old doc bug. Should say something like "Examine Floating Point".  Hopefully it will be fixed in the next revision of the SDM presumably in a quarter or so.

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