[libre-riscv-dev] [Bug 286] DataPointer concept: long-immediate references

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=286

--- Comment #4 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to cand from comment #3)
> Yes, the amount of instructions POWER needs to load a 64-bit immediate is
> not very efficient.

mitch alsup mentioned that those comprise something like 6% of all instructions
(!).  i'm blown away that this has been a missed opportunity to significantly
reduce code size and i-cache usage.  particularly as a reduction in i-cache
size obeys a square law reduction in power consumption.  therefore if we can
get it down 5% that's a 10.25% reduction in power (!)

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