On Fri, Dec 05, 2008 at 12:24:50PM -0800, Amit Uttamchandani wrote: > Hey guys, > > I'm learning the PPC architecture and I have a PowerBook G4 (7410) > 500MHz. Looking at the datasheet for the processor, it has support for > hardware speculation which allows out-of-order execution. > > I wanted to test program run times by compiling using gcc with flags > that enable and then disable support for this hardware speculation > feature. This is just to see the difference between program run times. > > Any ideas which flags/options I should be using in gcc?
I'm not sure that there really is a flag to enable or disable that particular specific feature. What you could do, I guess, is to use -mcpu=common (or any of the other similar options, see 'info gcc') to select a processor that does not support hardware speculation; but that will of course also disable other things, and make it harder to compare timings. -- <Lo-lan-do> Home is where you have to wash the dishes. -- #debian-devel, Freenode, 2004-09-22 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
