Only about 16 of those have either implicit use, are reserved, or subject to convention. I didn't mention the general register set of 64 32-bit registers that is nine-way ported. Or if you like 'automated' stepping through of arrays where you get to specify up to 8 byte strides. (d) Displacement-postmodify stores and loads from/to memory. (c) Two DMAs per core with a handy suite of configurable behaviours. allows two instructions to be executed in parallel on every clock cycle, if certain parallel-issue rules are followed. (a) Substantial write based/biased asymmetry in mesh network transfers. special/intriguing features ( to be ruthlessly leveraged in my opinion ) are :
ELINKS OUT OF MEMORY 64 BIT
Floating point is either 32 or 64 bit wide IEEE-754 format, but some features of that standard are not supported ( relating to NaN's, denormals, rounding to infinity and inexact flags ). There is simple branch prediction with a fixed 3 cycle penalty. It does have a variable length instruction pipeline that suitably but simply manages dependency hazards ( it stalls until resolution ). Epiphany has no fancy memory based operands scheme, no memory segmentation, no memory paging, no memory protection, no privileged rings/instructions, and only a tad of base + index addressing. This is a joy compared to the CISC assembly that I have done in the past ( x86 ). The gag here is that both the ARM CPU and Epiphany chips have RISC cores ie. But I'm defining a subset of ( anticipated ) generally required functionality, most to do with inter-core communication/transfer/signalling, that I'll write in assembler and hand optimise. it's hard to do everything in assembler, so most programming will be at a higher level. I'm quite happy with the monitored power supply I've built. counting down to delivery, the promise is by the end of this month !
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