[Bug binutils/27397] CET autodetection fails configure on i486 and i586 targets

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27397

--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Sergei Trofimovich from comment #8)

> 
> Do I understand correctly it's supposed to be decoded by old CPUs as:
>     prefix=F3 (REP) escape="0F 1E" (Reserved-NOP) modrm(?)=FB
> 
> Do you know when these 'Reserved-NOP' were introduced as valid instruction
> to IA-32? I wonder why K6-III can't handle it: is it a CPU bug (imprecise
> implementation of reserved NOPs) or it was introduced later.

Pentium Pro supports multi-byte NOP.  A run-time test can be added.

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