Hi, 2011/3/22 Ian Lance Taylor <iant@xxxxxxxxxx>: > "Zuxy Meng" <zuxy.meng@xxxxxxxxx> 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. 'info gcc' tells me that '-march=CPU-TYPE' implies '-mtune=CPU-TYPE', at least for x86... -- Zuxy Beauty is truth, While truth is beauty. PGP KeyID: E8555ED6
