From: Wathsala Vithanage <wathsala.vithanage@arm.com>
To: dev@dpdk.org
Subject: Re: [PATCH] mbuf: optimize segment prefree
Date: Mon, 6 Oct 2025 12:46:01 -0500 [thread overview]
Message-ID: <9428c18d-fec7-4400-a4f3-b2614b7fb058@arm.com> (raw)
In-Reply-To: <20250827161726.24cebd9c@hermes.local>
On 8/27/25 18:17, Stephen Hemminger wrote:
> On Wed, 27 Aug 2025 21:35:34 +0000
> Morten Brørup <mb@smartsharesystems.com> wrote:
>
>>
>> +/* GCC only optimizes single-bit MSB tests this way, so do it by hand with multi-bit. */
>> +#if defined(RTE_TOOLCHAIN_GCC) && defined(RTE_ARCH_X86)
>> +#undef RTE_MBUF_DIRECT
>> +#define RTE_MBUF_DIRECT(mb) \
>> + (!(((const uint8_t *)(mb))[offsetof(struct rte_mbuf, ol_flags) + 7] & \
>> + (uint8_t)((RTE_MBUF_F_INDIRECT | RTE_MBUF_F_EXTERNAL) >> 56)))
>> +#endif
> Complex enough expression that I would prefer this be an inline function
> with some more temporary variables and more comments.
> Like the magic 7 for mask??
+1
--wathsala
next prev parent reply other threads:[~2025-10-06 17:46 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-27 21:35 Morten Brørup
2025-08-27 23:17 ` Stephen Hemminger
2025-10-06 17:46 ` Wathsala Vithanage [this message]
2025-10-06 18:26 ` Morten Brørup
2025-10-06 14:49 ` Morten Brørup
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