Re: [OT] Disabling hardware speculation support in GCC flags

[Paul Mackerras <paulus@samba.org>]

Amit Uttamchandani writes:

> 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?

It's not something that gcc has any control over.  In fact there isn't
any way to turn off the out-of-order execution that I know of.

Paul.