linux-kernel - Re: C aggregate passing (Rust kernel policy)

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Message-ID: <09rq8307-0431-2610-8920-p6rnsosr0n7o@vanv.qr>
Date: Sun, 23 Feb 2025 00:56:22 +0100 (CET)
From: Jan Engelhardt <ej@...i.de>
To: Kent Overstreet <kent.overstreet@...ux.dev>
cc: Linus Torvalds <torvalds@...ux-foundation.org>, 
    "H. Peter Anvin" <hpa@...or.com>, Ventura Jack <venturajack85@...il.com>, 
    Gary Guo <gary@...yguo.net>, airlied@...il.com, boqun.feng@...il.com, 
    david.laight.linux@...il.com, gregkh@...uxfoundation.org, 
    hch@...radead.org, ksummit@...ts.linux.dev, linux-kernel@...r.kernel.org, 
    miguel.ojeda.sandonis@...il.com, rust-for-linux@...r.kernel.org
Subject: Re: C aggregate passing (Rust kernel policy)


On Saturday 2025-02-22 23:34, Kent Overstreet wrote:
>
>> The VLIW people have proclaimed the same efficiency advantages for
>> decades. I know. I was there (with Peter ;), and we tried. We were
>> very very wrong.
>
>If we ever get a chance I want to hear stories :)

The story is probably about Transmeta CPUs. The TM5x00 has some VLIW
design, and for "backwards compatibility" has microcode to translate
x86 asm into its internal representation (sounds like what every OOO
CPU having microops is doing these days).