From: "Morten Brørup" <mb@smartsharesystems.com>
To: "Stephen Hemminger" <stephen@networkplumber.org>
Cc: <dev@dpdk.org>, "Bruce Richardson" <bruce.richardson@intel.com>
Subject: RE: [PATCH] eal/x86: optimize memcpy of small 64-byte blocks
Date: Tue, 4 Aug 2026 18:25:42 +0200 [thread overview]
Message-ID: <98CBD80474FA8B44BF855DF32C47DC35F659B8@smartserver.smartshare.dk> (raw)
In-Reply-To: <20260804085210.74763eb5@phoenix.local>
> From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> Sent: Tuesday, 4 August 2026 17.52
>
> On Tue, 4 Aug 2026 14:33:04 +0000
> Morten Brørup <mb@smartsharesystems.com> wrote:
>
> > + /* Common way for small copy size of 64-byte blocks. Unlikely, so
> constant size only */
> > + if (__rte_constant(n) && (n & 63) == 0 && n <=
> RTE_MEMCPY_BLOCK_64_MAX) {
> > + void *ret = dst;
> > +
>
> Maybe just let compiler decide, it will generate vector instructions in
> most cases.
>
> if (__rte_constant(n))
> return mempcpy(dst, src, n);
Maybe in most, but not in all:
https://godbolt.org/z/KvdKqT5rY
next prev parent reply other threads:[~2026-08-04 16:25 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-04 14:33 [PATCH] eal/x86: optimize memcpy of small 64-byte blocks Morten Brørup
2026-08-04 14:33 ` [RFC PATCH] pile stack and mempool driver (resend) Morten Brørup
2026-08-04 14:38 ` Morten Brørup
2026-08-04 15:52 ` [PATCH] eal/x86: optimize memcpy of small 64-byte blocks Stephen Hemminger
2026-08-04 16:25 ` Morten Brørup [this message]
2026-08-05 5:45 ` Konstantin Ananyev
2026-08-05 5:56 ` Morten Brørup
2026-08-05 6:50 ` Konstantin Ananyev
2026-08-05 8:36 ` Morten Brørup
2026-08-04 19:11 ` Morten Brørup
2026-08-04 20:42 ` Stephen Hemminger
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