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Mill CPU Architecture

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by

Iman Sh

on 17 April 2014

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Transcript of Mill CPU Architecture

Internal format

Vectorization

Pick

NaR
No general registers or rename

registers >>
fast, small, low-power bypass

No issue, dispatch, or retire stages
short pipe, low mispredict penalty

No encoded result addresses
compact code

Multi-result operations

The Mill is a new general-purpose
commercial CPU family.

Invented by Out-of-the-Box Computing.

This presentation from interview with Ivan Godard.

his group just knew they could "do better".

They worked for 10 years.

The Mill manages roughly 10% of the power
usage of other chips for the same
computations.

Introduction:
Metadata
Memory

a 64-bit Single Address Space (SAS) .

On-CPU caches all use virtual addressing

virtualisation is performed by a Translation Lookaside Buffer (TLB).

TLB allocate virtual memory in HW


The Belt
The Belt
connecting hundreds of temporary registers to places where they’ll eventually be used eats up about half the
power
budget in a CPU.
solution to this problem is replacing the registers in a CPU with something called a
‘belt’
a weird combination of a stack and a shift register.
CPU can take data from any position on the belt, perform an operation, and places the result at the front of the belt.
Advantages

Metadata reduces the number of distinct opcodes by a factor of seven.

Metadata enables speculative execution without fix-up code.

Metadata eliminates flag-control overheads in floating point.

Metadata permits vectorizing of
while-loops.
References:
Outline:
Mill CPU Architecture
Instructions and Pipelines


Instruction and pipelines contd.
Mill has lots of pipelines, and each one issue an operation each cyle
ootbcomp.com

youtube.com
Thanks for listening
What is the Mill CPU?
Why it is different?
The belt.
Metadata
Memory
Instruction and pipeline
Instruction execution
References

Advantages:
Full transcript