[dpdk-dev] [PATCH v6 2/7] hash: add assembly implementation of CRC32 intrinsics

[Liang, Cunming]

Got it, thanks.

> -----Original Message-----
> From: Yerden Zhumabekov [mailto:e_zhumabekov at sts.kz]
> Sent: Monday, February 02, 2015 1:34 PM
> To: Liang, Cunming; dev at dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v6 2/7] hash: add assembly implementation of
> CRC32 intrinsics
> 
> 
> 02.02.2015 11:15, Liang, Cunming пишет:
> >
> >> +static inline uint32_t
> >> +crc32c_sse42_u64(uint64_t data, uint64_t init_val)
> >> +{
> >> +    __asm__ volatile(
> >> +            "crc32q %[data], %[init_val];"
> >> +            : [init_val] "+r" (init_val)
> >> +            : [data] "rm" (data));
> >> +    return init_val;
> >> +}
> > [LCM] I'm curious about the benefit of replacing CRC32 intrinsic
> > "_mm_crc32_u32/64".
> 
> These intrinsics are not available on a platform which has no SSE4.2
> support so the build would fail.
> 
> See previous suggestion from Neil:
> http://dpdk.org/ml/archives/dev/2014-November/008353.html
> 
> --
> Sincerely,
> 
> Yerden Zhumabekov
> State Technical Service
> Astana, KZ