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From: bugzilla-daemon@libre-soc.org
To: libre-riscv-dev@lists.libre-riscv.org
Subject: [libre-riscv-dev] [Bug 286] DataPointer concept: long-immediate references
Date: Wed, 15 Apr 2020 10:00:52 +0000
Message-ID: <bug-286-13-Ws9En65yoc@https.bugs.libre-soc.org/> (raw)
In-Reply-To: <bug-286-13@https.bugs.libre-soc.org/>

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

--- Comment #4 from Luke Kenneth Casson Leighton <lkcl@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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  parent reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-14 17:02 [libre-riscv-dev] [Bug 286] New: " bugzilla-daemon
2020-04-15  6:41 ` [libre-riscv-dev] [Bug 286] " bugzilla-daemon
2020-04-15  9:10 ` bugzilla-daemon
2020-04-15  9:23 ` bugzilla-daemon
2020-04-15 10:00 ` bugzilla-daemon [this message]
2020-04-15 18:44 ` bugzilla-daemon
2020-04-15 19:22 ` bugzilla-daemon
2020-04-15 19:40 ` bugzilla-daemon

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