From: Jan Beulich <jbeulich@suse.com>
To: jacob navia <jacob@jacob.remcomp.fr>
Cc: binutils@sourceware.org
Subject: Re: P.S. Follow up to my last post
Date: Fri, 25 Aug 2023 14:00:50 +0200 [thread overview]
Message-ID: <7ae0d3c7-d785-d693-03c1-989e399db7c8@suse.com> (raw)
In-Reply-To: <1140E4A3-B227-4824-B4D1-88A95910C0CC@jacob.remcomp.fr>
On 25.08.2023 13:52, jacob navia wrote:
> The lack of the Ebb instructions is CRUCIAL for performance when accessing tables / arrays!
> This instructions allow to combine an addition and a shift by 1, 2 or 3, to access tables of shorts, ints or doubles.
> This speeds up the access to tables enormously and would allow gcc to generate much better code.
Since you're writing to binutils@, you may want to also mention what gas
bug you think you see. So far (also in the other mail) you've talked of
only gcc. If you meant to say that like in gcc you need to enable use of
the instructions in gas, then yes, that's the way the RISC-V assembler
works (like e.g. also the PPC one, but unlike e.g. the x86 one).
Jan
next prev parent reply other threads:[~2023-08-25 12:00 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-25 11:52 jacob navia
2023-08-25 12:00 ` Jan Beulich [this message]
2023-08-25 13:07 ` jacob navia
2023-08-25 13:30 ` Jan Beulich
2023-08-25 13:40 ` Paul Koning
[not found] <AEF14E89-14CF-4474-8822-B0139F3F740B@jacob.remcomp.fr>
2023-08-25 15:32 ` Palmer Dabbelt
2023-08-25 16:10 ` jacob navia
2023-08-25 17:03 ` Paul Koning
2023-08-25 19:44 ` jacob navia
2023-08-28 6:17 ` Jan Beulich
2023-08-28 7:04 ` jacob navia
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