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    SubjectRe: [Q] Implementation of spin_lock on i386: why "rep;nop" ?
    > The "rep;nop" line looks dubious, since the IA-32 programmer's manual from
    > Intel (year 2001) mentions that the behaviour of REP is undefined when it
    > is not used with string opcodes. BTW, according to the same manual, REP is
    > supposed to modify ecx, but it looks like is is not the case here... which
    > is fortunate, since ecx is never saved. :-)

    rep nop is a pentium IV operation. Its retroactively after testing defined
    to be portable and ok.

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