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. -- You are receiving this mail because: You are on the CC list for the bug.
