RE: [Qemu-devel] [PATCH] add a simple 24mhz clock for the versatile

[Wessel, Jason]

uint64_t now = qemu_get_clock(vm_clock);
return (uint32_t)((now*3)/125);

The optimizer should fix this up with no floating point ops.

 

Jason.

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From: address@hidden [mailto:address@hidden On Behalf Of Jonathan Kalbfeld
Sent: Friday, March 30, 2007 12:50 PM
To: address@hidden
Subject: Re: [Qemu-devel] [PATCH] add a simple 24mhz clock for the versatile

If you're ok you can shift it left 4 bits, then add half that result then shift right 10 bits.

Of course, you'll only get 23.4Mhz that way :-)

jonathan

On 3/30/07, Paul Brook <address@hidden> wrote:

> + uint64_t now = qemu_get_clock(vm_clock);
> + return (uint32_t)(now*.024);

We should be able to do this without resorting to floating point arithmetic.

Paul

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Jonathan Kalbfeld
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