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From: Thomas Monjalon <thomas.monjalon@6wind.com>
To: "Qiu, Michael" <michael.qiu@intel.com>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH 1/3 v2] librte_hash: Fix unsupported instruction `crc32' in i686 platform
Date: Thu, 19 Mar 2015 09:10:06 +0100
Message-ID: <2427100.51HZplg4KW@xps13> (raw)
In-Reply-To: <533710CFB86FA344BFBF2D6802E60286D1603B@SHSMSX101.ccr.corp.intel.com>

2015-03-19 02:00, Qiu, Michael:
> On 3/8/2015 2:39 AM, Thomas Monjalon wrote:
> > 2015-03-06 01:39, Qiu, Michael:
> >> On 3/6/2015 1:11 AM, Thomas Monjalon wrote:
> >>> 2015-03-06 00:55, Michael Qiu:
> >>>> CC rte_hash.o
> >>>> Error: unsupported instruction `crc32'
> >>>>
> >>>> The root cause is that i686 platform does not support 'crc32q'
> >>>> Need make it only available in x86_64 platform
> >>>>
> >>>> Signed-off-by: Michael Qiu <michael.qiu@intel.com>
> >>>> ---
> >>>> v2 --> v1:
> >>>>          Make crc32 instruction only works in X86 platform
> >>>>  lib/librte_hash/rte_hash_crc.h | 12 ++++++++++++
> >>>>  1 file changed, 12 insertions(+)
> >>>>
> >>>> diff --git a/lib/librte_hash/rte_hash_crc.h b/lib/librte_hash/rte_hash_crc.h
> >>>> index d28bb2a..c0a789e 100644
> >>>> --- a/lib/librte_hash/rte_hash_crc.h
> >>>> +++ b/lib/librte_hash/rte_hash_crc.h
> >>>> @@ -364,6 +364,7 @@ crc32c_2words(uint64_t data, uint32_t init_val)
> >>>>  	return crc;
> >>>>  }
> >>>>  
> >>>> +#if defined RTE_ARCH_I686 || defined RTE_ARCH_X86_64
> >>>>  static inline uint32_t
> >>>>  crc32c_sse42_u32(uint32_t data, uint32_t init_val)
> >>>>  {
> >>>> @@ -373,7 +374,9 @@ crc32c_sse42_u32(uint32_t data, uint32_t init_val)
> >>>>  			: [data] "rm" (data));
> >>>>  	return init_val;
> >>>>  }
> >>>> +#endif
> >>> Wouldn't it be more elegant to define a stub which returns 0 in #else
> >>> in order to remove #ifdef below?
> >>> Not sure, matter of taste.
> >> It may be not a good idea, see rte_hash_crc_8byte(), if no crc32
> >> support, it will use crc32c_2words(), if we define a stub which returns
> >> 0 in #else, then we need always check the return value whether it is
> >> none-zero otherwise need fallback.
> > I don't think so.
> > The stub won't never been called because they are protected by the cpuflag
> > condition.
> 
> Hi, Thomas
> 
> Indeed what I concerned occurs, when compile target i686 in X86_64
> platform, it will call the stub function

Oh, you mean compiling for i686 and run it in x86_64 target,
so the stub for crc32c_sse42_u64 is called?

> Then, should I make a patch to fix, change the code as this one(V2)
> Another choice is you could revert V3 and merge V2.
> Or if have other solution?

It's probably saner to submit a fix you have tested with ifdef like in v2.
Thanks

  reply	other threads:[~2015-03-19  8:10 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-05 13:15 [dpdk-dev] [PATCH 0/3] dpdk2.0-rc1 build error fix Michael Qiu
2015-03-05 13:15 ` [dpdk-dev] [PATCH 1/3] librte_hash: Fix unsupported instruction `crc32' in i686 platform Michael Qiu
2015-03-05 16:10   ` Yerden Zhumabekov
2015-03-05 16:34     ` Qiu, Michael
2015-03-05 16:55   ` [dpdk-dev] [PATCH 1/3 v2] " Michael Qiu
2015-03-05 17:02     ` Yerden Zhumabekov
2015-03-05 17:10     ` Thomas Monjalon
2015-03-06  1:39       ` Qiu, Michael
2015-03-07 18:39         ` Thomas Monjalon
2015-03-10  3:55           ` Yerden Zhumabekov
2015-03-19  2:00           ` Qiu, Michael
2015-03-19  8:10             ` Thomas Monjalon [this message]
2015-03-09  5:58     ` [dpdk-dev] [PATCH 1/3 v3] " Michael Qiu
2015-03-18 13:20       ` Liu, Yong
2015-03-18 14:59         ` Qiu, Michael
2015-03-05 13:15 ` [dpdk-dev] [PATCH 2/3] app/test: Fix size_t printf formart issue Michael Qiu
2015-03-05 13:22   ` Bruce Richardson
2015-03-05 14:00   ` [dpdk-dev] [PATCH 2/3 v2] app/test: Fix size_t printf format issue Michael Qiu
2015-03-05 17:27     ` Thomas Monjalon
2015-03-06  1:42       ` Qiu, Michael
2015-03-06  3:53     ` [dpdk-dev] [PATCH 2/3 v3] " Michael Qiu
2015-03-05 13:15 ` [dpdk-dev] [PATCH 3/3] librte_eal/common: Fix redeclaration of enumerator ‘REG_EAX’ Michael Qiu
2015-03-05 13:23   ` Bruce Richardson
2015-03-05 13:36     ` David Marchand
2015-03-05 13:54       ` Qiu, Michael
2015-03-05 13:41     ` Qiu, Michael
2015-03-05 13:23   ` Qiu, Michael
2015-03-05 13:50   ` [dpdk-dev] [PATCH 3/3 v2] =?UTF-8?q?librte=5Feal/common:=20Fix=20redeclaration=20of?= =?UTF-8?q?=20enumerator=20=E2=80=98REG=5FEAX=E2=80=99?= Michael Qiu
2015-03-05 13:54     ` [dpdk-dev] [PATCH 3/3 v2] librte_eal/common: Fix redeclaration of enumerator ‘REG_EAX’ David Marchand
2015-03-05 14:03       ` Qiu, Michael
2015-03-05 14:38         ` Thomas Monjalon
2015-03-05 16:31           ` Qiu, Michael
2015-03-05 18:24             ` Thomas Monjalon
2015-03-05 13:57   ` [dpdk-dev] [PATCH 3/3 v3] =?UTF-8?q?librte=5Feal/common:=20Fix=20redeclaration=20of?= =?UTF-8?q?=20enumerator=20=E2=80=98REG=5FEAX=E2=80=99?= Michael Qiu
2015-03-06  6:28     ` [dpdk-dev] [PATCH 3/3 v3] librte_eal/common: Fix redeclaration of enumerator ‘REG_EAX’ David Marchand
2015-03-09 17:04 ` [dpdk-dev] [PATCH 0/3] dpdk2.0-rc1 build error fix Thomas Monjalon

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