Expiry of x86-64 patents

By: Mark Roulo (nothanks.delete@this.xxx.com), October 30, 2020 11:42 am
Room: Moderated Discussions
Jukka Larja (roskakori2006.delete@this.gmail.com) on October 30, 2020 11:29 am wrote:
> Mark Roulo (nothanks.delete@this.xxx.com) on October 30, 2020 10:21 am wrote:
> > Jukka Larja (roskakori2006.delete@this.gmail.com) on October 30, 2020 9:52 am wrote:
> > > me (me.delete@this.me.com) on October 30, 2020 9:47 am wrote:
> > > > > And I presume you are talking about AVX2. Both PS4 and Xbox One support AVX,
> > > > > and that alone obviously didn't gather any significant support (even though
> > > > > consoles have much more benefit from CPU optimizations compared to PC).
> > > > >
> > > > > -JLarja
> > > >
> > > > IIRC Jaguar's AVX isn't any faster than using SSE so devs mostly ignored it I guess.
> > >
> > > Is any AVX faster than SSE?
> > >
> > > -JLarja
> >
> > For my employer’s loads, AVX2 runs about 1.7x faster than SSE for compute bound loads.
>
> Yes, but that's AVX2, which is not available on Jaguar.
>
> -JLarja

It is AVX2 because many of our loads are short integer loads.

AVX won’t be faster on Jaguar than SSE because the Jaguar vector units are 128 bits wide so the AVX instructions needs roughly 2x the clocks per instruction which cancels out doing 2x more work per op.


I would expect AVX implementations that are 256 bits wide (eg. Sandy Bridge) to run ~1.7x faster than SSE on floating point code.

The slowdown is AMD specific (and only on some cores), not inherent with AVX.

< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
Expiry of x86-64 patentsBeastian2019/04/19 09:05 AM
  Expiry of x86-64 patentsGian-Carlo Pascutto2019/04/19 09:46 AM
    Expiry of x86-64 patentsBeastian2019/04/19 10:06 AM
    Expiry of x86-64 patentsJukka Larja2019/04/19 10:44 AM
      Expiry of x86-64 patentsGian-Carlo Pascutto2019/04/19 11:12 AM
        Expiry of x86-64 patentsJukka Larja2019/04/19 12:41 PM
          Expiry of x86-64 patentsRobert Williams2019/04/19 01:18 PM
          Expiry of x86-64 patentsGian-Carlo Pascutto2019/04/19 02:35 PM
          Expiry of x86-64 patentsIntelUser20002020/10/30 02:17 AM
            Expiry of x86-64 patentsJukka Larja2020/10/30 07:49 AM
              Expiry of x86-64 patentsme2020/10/30 09:47 AM
                Expiry of x86-64 patentsJukka Larja2020/10/30 09:52 AM
                  Expiry of x86-64 patentsMark Roulo2020/10/30 10:21 AM
                    Expiry of x86-64 patentsJukka Larja2020/10/30 11:29 AM
                      Expiry of x86-64 patentsMark Roulo2020/10/30 11:42 AM
                        Expiry of x86-64 patentsJukka Larja2020/10/30 09:04 PM
                          SIMD syntaxhobold2020/10/31 06:54 AM
                            SIMD syntaxJukka Larja2020/10/31 09:14 AM
                              SIMD syntaxhobold2020/11/01 08:22 AM
                                SIMD syntaxJukka Larja2020/11/01 11:11 AM
                                  SIMD syntaxhobold2020/11/02 05:33 AM
                          Expiry of x86-64 patentsme2020/10/31 03:01 PM
                            Expiry of x86-64 patentsJukka Larja2020/10/31 09:23 PM
                              Expiry of x86-64 patentsFoo_2020/11/01 04:48 AM
                                Expiry of x86-64 patentsJukka Larja2020/11/01 07:01 AM
                      Expiry of x86-64 patentsAdrian2020/10/30 12:02 PM
                        Expiry of x86-64 patentsBigos2020/10/30 01:20 PM
      Expiry of x86-64 patentsGeoff Langdale2019/04/19 02:52 PM
        Expiry of x86-64 patentsJukka Larja2019/04/19 09:38 PM
      Expiry of x86-64 patentsYuhong Bao2019/04/20 02:35 PM
  Expiry of x86-64 patentsDoug S2019/04/19 10:40 AM
    Expiry of x86-64 patentsBeastian2019/04/19 11:10 AM
      Expiry of x86-64 patentsRobert Williams2019/04/20 08:15 AM
        Expiry of x86-64 patentsRobert Williams2020/10/28 06:42 AM
  Expiry of x86-64 patentsanyone2019/04/20 07:11 AM
    Expiry of x86-64 patentsGroo2019/04/20 07:29 AM
      Expiry of x86-64 patentswumpus2019/04/20 08:32 AM
      Expiry of x86-64 patentsblaine2020/10/30 12:03 PM
        Expiry of x86-64 patentsDavid Kanter2020/10/30 08:59 PM
  Intel vs AMD patentsYuhong Bao2019/04/20 02:32 PM
    Intel vs AMD patentsBeastian2019/04/20 03:35 PM
  Expiry of x86-64 patentsTravis Downs2019/04/20 07:24 PM
    Expiry of x86-64 patentsnone2019/04/21 07:36 AM
      Expiry of x86-64 patentssomebody2019/11/27 10:44 AM
      Expiry of x86-64 patentsAnon32019/11/27 05:16 PM
        Expiry of x86-64 patentsTravis Downs2019/11/27 06:17 PM
      Expiry of x86-64 patentsMontaray Jack2019/11/28 12:03 AM
        Expiry of x86-64 patentsnone2019/11/28 01:57 AM
          Expiry of x86-64 patentsdmcq2019/11/28 11:20 AM
            Expiry of x86-64 patentsMontaray Jack2019/11/29 05:00 AM
Reply to this Topic
Name:
Email:
Topic:
Body: No Text
How do you spell avocado?