From: Matan Azrad <matan@mellanox.com>
To: Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>,
"jerin.jacob@caviumnetworks.com" <jerin.jacob@caviumnetworks.com>,
"keith.wiles@intel.com" <keith.wiles@intel.com>,
Thomas Monjalon <thomas@monjalon.net>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH v2 1/2] eal: add API to align integer to previous power of 2
Date: Mon, 19 Feb 2018 12:09:46 +0000 [thread overview]
Message-ID: <AM4PR0501MB26573D7AD80F83C590A8297FD2C80@AM4PR0501MB2657.eurprd05.prod.outlook.com> (raw)
In-Reply-To: <20180219113643.10337-1-pbhagavatula@caviumnetworks.com>
Hi Pavan
> From: Pavan Nikhilesh, Monday, February 19, 2018 1:37 PM
> Add 32b and 64b API's to align the given integer to the previous power of 2.
>
> Signed-off-by: Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>
> ---
> v2 Changes:
> - Modified api name to `rte_align(32/64)prevpow2` from
> `rte_align(32/64)lowpow2`.
> - corrected fuction to return if the integer is already aligned to power of 2.
>
> lib/librte_eal/common/include/rte_common.h | 43
> ++++++++++++++++++++++++++++++
> 1 file changed, 43 insertions(+)
>
> diff --git a/lib/librte_eal/common/include/rte_common.h
> b/lib/librte_eal/common/include/rte_common.h
> index c7803e41c..b2017ee5c 100644
> --- a/lib/librte_eal/common/include/rte_common.h
> +++ b/lib/librte_eal/common/include/rte_common.h
> @@ -259,6 +259,27 @@ rte_align32pow2(uint32_t x)
> return x + 1;
> }
>
> +/**
> + * Aligns input parameter to the previous power of 2
> + *
> + * @param x
> + * The integer value to algin
> + *
> + * @return
> + * Input parameter aligned to the previous power of 2
> + */
> +static inline uint32_t
> +rte_align32prevpow2(uint32_t x)
> +{
> + x |= x >> 1;
> + x |= x >> 2;
> + x |= x >> 4;
> + x |= x >> 8;
> + x |= x >> 16;
> +
> + return x - (x >> 1);
> +}
Nice.
Since you are using the same 5 lines from the rte_align32pow2() function, I think this part can be in a separate function to do reuse.
Also the "fill ones 32" function can be used for other purpose.
What do you think?
> /**
> * Aligns 64b input parameter to the next power of 2
> *
> @@ -282,6 +303,28 @@ rte_align64pow2(uint64_t v)
> return v + 1;
> }
>
> +/**
> + * Aligns 64b input parameter to the previous power of 2
> + *
> + * @param v
> + * The 64b value to align
> + *
> + * @return
> + * Input parameter aligned to the previous power of 2
> + */
> +static inline uint64_t
> +rte_align64prevpow2(uint64_t v)
> +{
> + v |= v >> 1;
> + v |= v >> 2;
> + v |= v >> 4;
> + v |= v >> 8;
> + v |= v >> 16;
> + v |= v >> 32;
> +
> + return v - (v >> 1);
> +}
> +
> /*********** Macros for calculating min and max **********/
>
> /**
> --
> 2.16.1
next prev parent reply other threads:[~2018-02-19 12:09 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-17 10:49 [dpdk-dev] [PATCH " Pavan Nikhilesh
2018-02-17 10:49 ` [dpdk-dev] [PATCH 2/2] test: update common auto test Pavan Nikhilesh
2018-02-18 6:11 ` [dpdk-dev] [PATCH 1/2] eal: add API to align integer to previous power of 2 Matan Azrad
2018-02-18 15:39 ` Wiles, Keith
2018-02-19 6:03 ` Matan Azrad
2018-02-19 13:55 ` Wiles, Keith
2018-02-19 14:13 ` Matan Azrad
2018-02-19 14:21 ` Wiles, Keith
2018-02-19 16:18 ` Thomas Monjalon
2018-02-19 8:36 ` Pavan Nikhilesh
2018-02-19 11:36 ` [dpdk-dev] [PATCH v2 " Pavan Nikhilesh
2018-02-19 11:36 ` [dpdk-dev] [PATCH v2 2/2] test: update common auto test Pavan Nikhilesh
2018-02-19 12:09 ` Matan Azrad [this message]
2018-02-26 19:10 ` [dpdk-dev] [PATCH v2 1/2] eal: add API to align integer to previous power of 2 Pavan Nikhilesh
2018-02-27 19:30 ` Matan Azrad
2018-04-04 10:16 ` [dpdk-dev] [PATCH v3 " Pavan Nikhilesh
2018-04-04 10:16 ` [dpdk-dev] [PATCH v3 2/2] test: update common auto test Pavan Nikhilesh
2018-04-04 12:49 ` Thomas Monjalon
2018-04-04 12:54 ` Pavan Nikhilesh
2018-04-04 16:10 ` [dpdk-dev] [PATCH v3 1/2] eal: add API to align integer to previous power of 2 Matan Azrad
2018-04-04 16:42 ` Pavan Nikhilesh
2018-04-04 17:11 ` Matan Azrad
2018-04-04 17:51 ` Pavan Nikhilesh
2018-04-04 18:10 ` Matan Azrad
2018-04-04 18:15 ` Pavan Nikhilesh
2018-04-04 18:23 ` Matan Azrad
2018-04-04 18:36 ` Pavan Nikhilesh
2018-04-04 19:41 ` Matan Azrad
2018-04-04 13:20 ` [dpdk-dev] [PATCH v4] " Pavan Nikhilesh
2018-04-04 15:23 ` Thomas Monjalon
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