"rep ret" even for Intel CPUs?

[Ian Lance Taylor]

"Zuxy Meng" <zuxy.meng@gmail.com> writes:

> I found that gcc 4.5 generates "rep ret" even under -march=core2. Does
> an Intel CPU benefit from this optimization too?

As far as I know no Intel CPU benefits.  Note that -march selects the
architecture but not the tuning.  The default tuning uses "rep; ret"
when appropriate.  If you want to avoid it, use a -mtune option.

Ian