Evolution not revolution
When asked if the deliberations of HSA would drive the creation of new
instruction set architectures and processor cores from Apple and others,
Davies said indicated the impact would first be at the system level and
in the interconnect around processing elements. So, for example, it
could drive the creation of hardware interconnect that will conform to
HSA guidelines; a son-of-AMBA interconnect standard.
going to be evolutionary, not revolutionary. We're tweaking around the
outside of the next Mali GPU, the next ARM CPU," said Davies. ARM
has already got OpenCL programs running on Mali GPUs and Cortex CPUs
said Davies, "but it’s a bit of a Ninja programming sport." He said the
HSA Foundation has the goal of making this much easier.
made the point that ARM's Mali-T600 family of GPUs already has many of
the features that HSA is standardizing. These include support for 64-bit
integer and floating-point arithmetic, page tables with 48-bit virtual
addresses, GPU virtual addresses shadow CPU virtual addresses and GPU
I/O is coherent with that of the CPU.
Future generations of GPU
under development at ARM will allow GPUs to directly share CPU page
tables, and make GPUs fully coherent with CPUs, Davies said.
is expected to deliver HSA-compatible GPUs that will allow appropriate
workloads to run on CPUs and GPUs in a parallel in 2014.
Click on image to enlarge.
The HSA solution stack. Source AMD
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