Re: [Qemu-trivial] [Qemu-devel] [PATCH] qemu-timer: Don't use RDTSC on 386s and 486s

[Jamie Lokier]

Peter Maydell wrote:
> On 23 November 2012 15:31, Jamie Lokier <address@hidden> wrote:
> > x86 instruction sets haven't followed a linear progression of features
> > for quite a while, especially including non-Intel chips, so it stopped
> > making sense for GCC to indicate the instruction set in that way.
> 
> If you're going to go down that route you need to start defining
> #defines for features then, so we could say defined(__rdtsc__)
> or defined(__cmov__) and so on. I don't see any of those either :-(

It does for some major architectural instructions groups like MMX,
different kinds of SSE, etc.  But not everything and I don't see cmov
among them.  I agree it's unfortunate.

-- Jamie