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Mill CPU Architecture
Transcript of Mill CPU Architecture
No general registers or rename
fast, small, low-power bypass
No issue, dispatch, or retire stages
short pipe, low mispredict penalty
No encoded result addresses
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
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
connecting hundreds of temporary registers to places where they’ll eventually be used eats up about half the
budget in a CPU.
solution to this problem is replacing the registers in a CPU with something called a
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.
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
Mill CPU Architecture
Instructions and Pipelines
Instruction and pipelines contd.
Mill has lots of pipelines, and each one issue an operation each cyle
Thanks for listening
What is the Mill CPU?
Why it is different?
Instruction and pipeline