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walsufnir on 03 November 2016
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vivster said:
walsufnir said:

It isn't really faster just because you lose precision. It *could* be faster if

a) the algorithm or the computation doesn't need to be fp32 in all cases and

b) the hardware can store and use two 16 bit floating point numbers in the same time it would store and use one fp32.

Everyone is free to use fp16 right now but there is no real benefit for that.

Shouldn't it be easy to implement though? Developers mark the stuff that is FP16 and the GPU driver does the rest.

From an implementation point of view, yes. You just don't allocate a 32bit register anymore but a 16bit.

What I am wondering is if devs actually do that because that is extra work for a better PS4. Cerny said it should be as simple as possible to develop a pro mode off a ps4 game. Using fp16 just for a better version of the game and to test if accuracy is sufficient is a different beast. Perhaps you can use fp16 safely also on vanilla ps4 without any negatives but of course I don't know about that. But it doesn't seem that easy to really go into all the power the Neo provides over the vanilla ps4, especially when there are no exclusives allowed.