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Re: [Qemu-devel] Missing ARMv6 instructions?

From: Jonas Maebe
Subject: Re: [Qemu-devel] Missing ARMv6 instructions?
Date: Sat, 1 Apr 2006 23:06:07 +0300

On 01 Apr 2006, at 22:51, Chris Wilson wrote:

and they have been an extensive user of software patents,

And how:

"The invention in this case involves locating all of the input registers in one data storage area, and all of the output registers in another data storage area. Then the simulator only has to switch the two storage areas around (eg. by exchanging two pointer values) in order to effectively COPY all of the output registers to the corresponding input registers of the next stage in a single operation. The Hearing Officer concluded that this invention did involve a technical contribution — not simply because it produced a faster simulator, but because the fundamental construction of the simulator had been modified."

So yes, using

struct registers *a, *b;
a = b;

instead of

struct registers a, b;

has been patented by ARM in the UK. In fact, wouldn't surprise me if Qemu violates this patent.


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