svn commit: r306319 - head/sys/i386/i386

Mon Sep 26 07:51:36 UTC 2016

On Mon, Sep 26, 2016 at 07:09:17AM +0000, Colin Percival wrote:
> Traditionally x86 CPUs would generate an invalid-opcode fault if redundant
> instruction prefixes resulted in an instruction exceeding 15 bytes.  This
> behaviour might have changed in the past two decades, but I doubt it.

It did not, 15 bytes is the current limit.  In fact, the longest AVX
VEX-encoded instructions are 11 bytes without prefixes, AFAIR.