Re: [Qemu-devel] [PATCH v14 27/33] target-tilegx: Handle mask instructions

[Richard Henderson]

On 08/30/2015 06:52 AM, Peter Maydell wrote:
> I *think* this code is correct, but the ISA manual perplexes me
> entirely. Why on earth would you describe anything as "compute
> the boolean AND of something with a value of all ones", when that's
> just a no-op? I can't see what I'm missing that means they
> didn't just describe 'mz' as "dest = srcA ? srcB : 0".

Clearly someone who decided that was the best way to implement a conditional 
move in hardware.  The language just propagated back to the manual.


r~