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Specint benchmarks conducted by Anandtech show the A13 going toe-to-toe with the 9900K [0], although x86 still has a decent lead for floating point. [0] https:
by berti 6y ago
Specint benchmarks conducted by Anandtech show the A13 going toe-to-toe with the 9900K [0], although x86 still has a decent lead for floating point.
[0] https://www.anandtech.com/show/14892/the-apple-iphone-11-pro-and-max-review/4 https://www.anandtech.com/show/14892/the-apple-iphone-11-pro... (scroll down to the 2nd last plot, look at the right half)
- p1necone 6y agoDo mobile chips focus less on floating point for some reason? Could that explain the seemingly massive difference in perf/watt?
- ip26 6y agoFloating point tends to matter for classic 'number crunching' workloads- crypto, media encoding, anything to do with modeling the physical world, image processing, AI. Phones tend towards 'control flow', e.g. display an interface, accept a user input, communicate with a server, display information... and media decoding & gps both have dedicated hardware. FP workloads can be incredibly power hungry, so it's fortunate mobile devices mostly manage to avoid them. But any chip with an FP unit is going to shut it off when running integer code.
- wtallis 6y agoCrypto doesn't do floating point. Media transcoding does SIMD, but not usually not floating point.
- ip26 6y agoFair enough wrt media. However SIMD e.g. MMX is done in the floating point unit (https://softpixel.com/~cwright/programming/simd/mmx.php https://softpixel.com/~cwright/programming/simd/mmx.php) I thought bitcoin mining was floating point, and that was why GPUs were so adept.
- Dylan16807 6y agoMMX is obsolete. SSE/AVX has its own set of registers. It can do floating point and integer operations. It would not be correct to refer to it as a floating point unit. GPUs are good at mining because they can do so many calculations in parallel. They're just as capable of integer operations as the SIMD units on a CPU.
- wtallis 6y agoMMX was integer SIMD that re-used the FPU register file, but was not doing floating-point operations.
- xxs 6y agoCrypto stuff never uses floating point. It might have built-in instructions like AES-NI, though. In the test geekbench consider that - integers ones[0] and definitely not floating point. Media encoding tend not to use floating point, either. (decoders tend to be built-in in the GPUs with designated hardware, so testing on CPU is quite pointless) [0]: https://www.geekbench.com/doc/geekbench5-cpu-workloads.pdf https://www.geekbench.com/doc/geekbench5-cpu-workloads.pdf