Questions About Apple's AVX512

By: --- (---.delete@this.redheron.com), May 13, 2022 8:33 am
Room: Moderated Discussions
Matt Lohmann (mlohmann.delete@this.noemail.com) on May 13, 2022 5:21 am wrote:
> > In fact the E cores (at least to judge by the patents, though this may be at the A15 or
> > even later level, not A14/M1) are capable of two full 512b vector-vector ops per cycle.
>
> Is the performance per clock cycle of the per-cluster vector engine for the E cores different from
> the performance per clock cycle of the per-cluster vector engine for the P cores in the Apple M1?
>
> How many 512-bit vector arithmetic operations per clock cycle can be performed
> by the per-cluster vector engine for the P cores in the Apple M1?
>
> Can the per-cluster vector engines in the Apple M1 overlap
> 512-bit loads and stores with arithmetic operations?
>
> Are fp64 fused multiply-adds (a * b + c) supported in either the
> per-cluster vector engines or the CPU cores in the Apple M1?
>
> Are 256-bit vector operations performed in each P core or only in the
> shared vector engine for a cluster of P cores in the Apple M1?
>
> Thank you in advance to anyone who can answer any of these questions.

You're asking questions about a direction that is indicated by the patents, and suggested by what we have seen or have tested of AMX, but no more than that. As such you can't expect answers that are any more than guesses.

The baseline P AMX engine is
4 vertically stacked super-PE's (processing engines).
Each PE is a rectangle of 8*2 processing engines (PEs).
So this gives you an array of 8*8 PEs.
The E AMX is (good enough) a single such super PE, so an array if 8*2 PE's.

A PE is a single unit that can perform an fp64 multiply-add, or 2 fp32 MACs, or (I think four) fp16s and four int16 or int8 mac's (plus some associated storage).
So if you do the arithmetic an E core has
- two rows of MACs
- each MACs can handle 64b, and there are 8 of them, so each row is 512b wide.

The AMX engine is right now very much set up as a coprocessor, one engine per cluster.

NEON (built into each core) uses 128b registers, and there are 4 NEON engines (so, in a handwaving sense) 512b of NEON capability per cycle per P core, 256b of NEON capability per cycle per E core.
SVE2 is *probably* coming to Apple this year with A16 and M2, and will *probably* feature 256b wide registers. But if you are evaluating SVE2 based on register width, you're misunderstanding where the value of SVE2 lies.

AMX (possibly in the M1 version, probably in the A15 version) appears capable of executing two operations per cycle, one load/store and one compute. But the compute operation may be a "fused" operation which is two independent vector operations that output results to independent rows of the array of PE's.
HOWEVER that's not as good as it sounds. Remember that AMX instructions execute on a core through the LSU, specifically through the store pipes. P core has two store pipes, E core has one. That means that, as throughput, P can only pump out two AMX instructions per cycle, E can only pump out one. Right now this is probably the biggest throughput weakness in the design, and something I expect to evolve soon. (An easy quick improvement would be to move the P core from the current design
- 2 load pipe
- 1 store pipe
- 1 ambidextrous pipe
to
- 1 load pipe
- 1 store pipe
- 2 ambidextrous pipes
which gives a possible throughput of 3 stores/AMX per cycle.
Transport of instructions from a core to the AMX unit is less of a concern because AMX operations are bundled into as many as will fit into the wide bus between a core and L2. That bundling number appears to be around 6 or 7 (some can build up in a queue if that bus is being used for other L1L2 transactions).

But, like I said, these are inappropriate questions right now.
If you want to understand the scheme and the direction, look at the patents, eg
a recent one with a good overview is (2019) https://patents.google.com/patent/US20200272597A1
If you are planning to build something huge and need this data, talk to Apple.
If you're simply curious, well, wait for WWDC then the September event!
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TopicPosted ByDate
Apple's AVX512---2022/05/11 11:32 PM
  Apple's AVX512Rayla2022/05/12 07:23 AM
    Apple's AVX512---2022/05/12 09:49 AM
      Apple's AVX512---2022/05/12 09:59 AM
  Questions About Apple's AVX512Matt Lohmann2022/05/13 04:21 AM
    Questions About Apple's AVX512---2022/05/13 08:33 AM
      Questions About Apple's AVX512Doug S2022/05/13 09:22 AM
        Questions About Apple's AVX512---2022/05/13 01:05 PM
          Questions About Apple's AVX512Doug S2022/05/13 08:28 PM
            Questions About Apple's AVX512Anon12022/05/13 11:53 PM
            Questions About Apple's AVX512Simon Farnsworth2022/05/14 04:20 AM
              Questions About Apple's AVX512Michael S2022/05/14 11:27 AM
                Questions About Apple's AVX512Doug S2022/05/15 09:50 AM
                  Questions About Apple's AVX512Michael S2022/05/15 12:01 PM
                    Questions About Apple's AVX512Doug S2022/05/15 11:59 PM
                      Questions About Apple's AVX512Michael S2022/05/16 01:29 AM
                    what it takes to really vectorizeRichardC2022/05/16 01:47 PM
                  Questions About Apple's AVX512---2022/05/16 09:22 PM
                    Questions About Apple's AVX512rwessel2022/05/17 12:42 AM
                      Questions About Apple's AVX512anon12022/05/17 03:47 AM
                        Questions About Apple's AVX512Michael S2022/05/17 05:28 AM
                          Questions About Apple's AVX512anon12022/05/18 12:15 AM
                            Questions About Apple's AVX512-.-2022/05/18 02:41 AM
                              Questions About Apple's AVX512Jan Wassenberg2022/05/18 09:23 PM
                                Questions About Apple's AVX512-.-2022/05/19 05:11 AM
                                  Questions About Apple's AVX512Jan Wassenberg2022/05/19 05:45 AM
                                    Questions About Apple's AVX512-.-2022/05/20 03:04 AM
                                      Questions About Apple's AVX512Jan Wassenberg2022/05/20 09:00 PM
                Questions About Apple's AVX512anon12022/05/16 03:44 AM
              Questions About Apple's AVX512Jörn Engel2022/05/15 10:34 PM
                Questions About Apple's AVX512Simon Farnsworth2022/05/16 03:13 AM
                  Questions About Apple's AVX512Jörn Engel2022/05/16 11:52 AM
                    Backward Compatibility for SVE2 CodeCharlie Burnes2022/05/16 05:57 PM
                      Backward Compatibility for SVE2 CodeJörn Engel2022/05/16 11:30 PM
                        Backward Compatibility for SVE2 CodeCharlie Burnes2022/05/17 02:31 AM
                          Backward Compatibility for SVE2 CodeJörn Engel2022/05/17 09:24 AM
                            Backward Compatibility for SVE2 CodeCharlie Burnes2022/05/17 10:21 AM
                              Backward Compatibility for SVE2 CodeJörn Engel2022/05/17 01:11 PM
                                OpenMP SIMD DirectivesCharlie Burnes2022/05/17 03:05 PM
                                  OpenMP SIMD DirectivesJörn Engel2022/05/17 04:14 PM
                                    OpenMP SIMD DirectivesJan Wassenberg2022/05/20 09:12 PM
                                      OpenMP SIMD DirectivesFreddie2022/05/21 06:13 AM
                                        OpenMP SIMD DirectivesJan Wassenberg2022/05/21 09:54 PM
                                      OpenMP SIMD DirectivesJörn Engel2022/05/21 12:23 PM
                                        Alternative to Highway for code that is not SIMD width agnosticCharlie Burnes2022/05/21 09:11 PM
                                          Alternative to Highway for code that is not SIMD width agnosticJan Wassenberg2022/05/21 10:16 PM
                                            Alternative to Highway for code that is not SIMD width agnosticCharlie Burnes2022/05/22 05:30 AM
                                              Removal of NEONDoug S2022/05/22 09:57 AM
                                                Removal of NEONCharlie Burnes2022/05/22 12:12 PM
                                                Removal of NEON-.-2022/05/23 03:23 AM
                                                  Removal of NEONDoug S2022/05/23 07:08 AM
                                                    Removal of NEONdmcq2022/05/23 11:59 AM
                                                  Removal of NEONblaine2022/05/24 09:40 PM
                                              Alternative to Highway for code that is not SIMD width agnosticJan Wassenberg2022/05/22 11:06 AM
                                                Alternative to Highway for code that is not SIMD width agnosticCharlie Burnes2022/05/22 12:06 PM
                                                  Alternative to Highway for code that is not SIMD width agnosticJan Wassenberg2022/05/22 09:35 PM
                                              Alternative to Highway for code that is not SIMD width agnostic-.-2022/05/23 03:28 AM
                                          Alternative to Highway for code that is not SIMD width agnosticAdrian2022/05/22 04:04 AM
                                            Alternative to Highway for code that is not SIMD width agnosticCharlie Burnes2022/05/22 06:20 AM
                                          Alternative to Highway for code that is not SIMD width agnosticJörn Engel2022/05/22 12:13 PM
                                            Alternative to Highway for code that is not SIMD width agnosticCharlie Burnes2022/05/22 12:53 PM
                                              Alternative to Highway for code that is not SIMD width agnosticJörn Engel2022/05/22 01:49 PM
                                                Unaligned Loads and StoresCharlie Burnes2022/05/22 04:34 PM
                                                Alternative to Highway for code that is not SIMD width agnosticJan Wassenberg2022/05/22 09:46 PM
                                                  Unaligned Loads and StoresCharlie Burnes2022/05/22 11:46 PM
                                                    Unaligned Loads and StoresJan Wassenberg2022/05/23 04:34 AM
                                                  Is Highway a full compiler or yet another LLVM front-end, like icpc ? (NT)Michael S2022/05/23 12:12 AM
                                                    Is Highway a full compiler or yet another LLVM front-end, like icpc ?none2022/05/23 12:57 AM
                                                      Is Highway a full compiler or yet another LLVM front-end, like icpc ?Michael S2022/05/23 01:08 AM
                                                        Is Highway a full compiler or yet another LLVM front-end, like icpc ?Jan Wassenberg2022/05/23 04:38 AM
                                        OpenMP SIMD DirectivesJan Wassenberg2022/05/21 10:07 PM
                                          OpenMP SIMD DirectivesJörn Engel2022/05/22 12:25 PM
                                            OpenMP SIMD DirectivesJan Wassenberg2022/05/22 09:56 PM
                                              OpenMP SIMD DirectivesMichael S2022/05/23 01:32 AM
                                                OpenMP SIMD DirectivesJan Wassenberg2022/05/23 04:49 AM
                                                  OpenMP SIMD DirectivesMichael S2022/05/23 12:04 PM
                                                    OpenMP SIMD DirectivesJan Wassenberg2022/05/23 09:43 PM
                                        OpenMP SIMD Directivesanon22022/05/22 10:42 PM
                                          OpenMP SIMD DirectivesJörn Engel2022/05/22 11:11 PM
                                            OpenMP SIMD Directivesanon22022/05/22 11:47 PM
                                              TemplatesMichael S2022/05/23 01:52 AM
                                                Templatesanon22022/05/23 02:36 AM
                                                  At least use a handle unique in the thread you post in... (NT)anon22022/05/23 07:16 AM
                                              TemplatesJörn Engel2022/05/23 09:41 AM
                              Backward Compatibility for SVE2 Codeanonymou52022/05/17 01:36 PM
                                Lack of Backward Compatibility for Intel AVX512Charlie Burnes2022/05/17 02:22 PM
                                  Lack of Backward Compatibility for Intel AVX512anonymou52022/05/18 02:15 AM
                                    Lack of Backward Compatibility for Intel AVX512anon22022/05/18 02:36 AM
                                      Lack of Backward Compatibility for Intel AVX512anonymou52022/05/18 04:06 AM
                                        Lack of Backward Compatibility for Intel AVX512Michael S2022/05/18 04:36 AM
                                          Lack of Backward Compatibility for Intel AVX512me2022/05/18 04:50 AM
                                            Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/18 05:47 AM
                                              Lack of Backward Compatibility for Intel AVX512me2022/05/18 08:18 AM
                                              Lack of Backward Compatibility for Intel AVX512Doug S2022/05/18 09:26 AM
                                                Lack of Backward Compatibility for Intel AVX512Brett2022/05/18 10:03 AM
                                                  Lack of Backward Compatibility for Intel AVX512me2022/05/18 10:35 AM
                                                    Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/18 09:31 PM
                                                      Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/19 04:58 AM
                                                        Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/19 05:55 AM
                                                          Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/19 10:09 AM
                                                            Why Is AVX 512 Useful for RPCS3?-.-2022/06/15 06:04 PM
                                                              Why Is AVX 512 Useful for RPCS3?Jukka Larja2022/06/15 08:33 PM
                                                    Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/19 04:56 AM
                                                      Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/19 05:49 AM
                                                        Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/19 10:14 AM
                                                          Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/19 11:19 AM
                                                            Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/20 09:04 AM
                                                              Lack of Backward Compatibility for Intel AVX512zzyzx2022/05/20 12:48 PM
                                                                Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/20 08:48 PM
                                                                  Lack of Backward Compatibility for Intel AVX512zzyzx2022/05/21 06:44 PM
                                                                    Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/21 08:48 PM
                                                                      Lack of Backward Compatibility for Intel AVX512zzyzx2022/05/22 01:46 AM
                                                                        Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/22 04:32 AM
                                                                          Lack of Backward Compatibility for Intel AVX512zzyzx2022/05/22 03:06 PM
                                                                            Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/22 11:59 PM
                                                                              Lack of Backward Compatibility for Intel AVX512zzyzx2022/05/23 10:02 PM
                                                                                Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/24 01:33 AM
                                                                                  Lack of Backward Compatibility for Intel AVX512zzyzx2022/05/24 02:18 PM
                                                                                    Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/25 05:01 AM
                                                                                      Lack of Backward Compatibility for Intel AVX512zzyzx2022/05/25 02:02 PM
                                                      Lack of Backward Compatibility for Intel AVX512Eugene Nalimov2022/05/19 09:25 PM
                                                        Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/20 08:34 AM
                                                  Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/18 09:40 PM
                                                    Lack of Backward Compatibility for Intel AVX512Andrey2022/05/19 08:26 AM
                                                    Lack of Backward Compatibility for Intel AVX512Brett2022/05/19 10:23 AM
                                                      Lack of Backward Compatibility for Intel AVX512Andrey2022/05/19 12:50 PM
                                                        Lack of Backward Compatibility for Intel AVX512Brett2022/05/20 10:52 PM
                                                  Lack of Backward Compatibility for Intel AVX512Adrian2022/05/18 11:22 PM
                                                  Lack of Backward Compatibility for Intel AVX512Brendan2022/05/19 03:32 AM
                                                Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/18 09:29 PM
                                                  Lack of Backward Compatibility for Intel AVX512Michael S2022/05/19 12:14 AM
                                                    Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/19 06:02 AM
                                                      Lack of Backward Compatibility for Intel AVX512Michael S2022/05/19 07:13 AM
                                                        Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/20 12:34 AM
                                                          Lack of Backward Compatibility for Intel AVX512Michael S2022/05/20 01:48 AM
                                                          OT Documentation on JPEG XL - site certificate brokenMichael S2022/05/20 02:17 AM
                                                            OT Documentation on JPEG XL - site certificate brokenJan Wassenberg2022/05/20 09:18 PM
                                                    Lack of Backward Compatibility for Intel AVX512-.-2022/05/20 02:55 AM
                                                      Lack of Backward Compatibility for Intel AVX512Michael S2022/05/20 04:51 AM
                                                        Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/20 09:54 PM
                                                          Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/20 09:57 PM
                                                            Lack of Backward Compatibility for Intel AVX512Michael S2022/05/21 09:57 AM
                                                              Lack of Backward Compatibility for Intel AVX512---2022/05/21 05:59 PM
                                                                Adding instructions to NEON??Doug S2022/05/22 10:01 AM
                                                                  Adding instructions to NEON??---2022/05/22 12:59 PM
                                                                    Adding instructions to NEON??Doug S2022/05/22 07:46 PM
                                                                      Adding instructions to NEON??Michael S2022/05/23 12:04 AM
                                                                        Adding instructions to NEON??anonymou52022/05/24 03:02 PM
                                                                      Adding instructions to NEON??Ungo2022/05/23 01:05 AM
                                                                        Adding instructions to NEON??---2022/05/23 05:49 AM
                                                                          Adding instructions to NEON??Ungo2022/05/23 08:01 PM
                                                                            Adding instructions to NEON??---2022/05/24 09:26 AM
                                                                      Adding instructions to NEON??---2022/05/23 05:56 AM
                                                                Lack of Backward Compatibility for Intel AVX512noko2022/05/23 11:29 AM
                                                              Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/21 10:47 PM
                                                                Lack of Backward Compatibility for Intel AVX512Michael S2022/05/22 12:40 AM
                                                                  Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/22 03:06 AM
                                                                    Lack of Backward Compatibility for Intel AVX512Michael S2022/05/22 04:12 AM
                                                                      Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/22 04:53 AM
                                                                        Lack of Backward Compatibility for Intel AVX512Michael S2022/05/22 05:15 AM
                                                                          Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/22 10:56 AM
                                              Lack of Backward Compatibility for Intel AVX512-.-2022/05/18 04:23 PM
                                                Sierra Forest Xeons - E Cores OnlyCharlie Burnes2022/05/19 02:11 AM
                                                  Sierra Forest Xeons - E Cores OnlyBrendan2022/05/19 03:42 AM
                                                    Sierra Forest Xeons - E Cores OnlyCharlie Burnes2022/05/19 04:30 AM
                                                      Sierra Forest Xeons - E Cores OnlyBrendan2022/05/20 03:06 AM
                                                        Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/20 10:32 AM
                                                          Sierra Forest Xeons - E Cores OnlyMark2022/05/20 11:15 AM
                                                            Sierra Forest Xeons - E Cores OnlyAndrey2022/05/20 02:34 PM
                                                            Sierra Forest Xeons - E Cores OnlyBrendan2022/05/20 04:29 PM
                                                            Sierra Forest Xeons - E Cores OnlyBjörn Ragnar Björnsson2022/05/20 04:54 PM
                                                              Sierra Forest Xeons - E Cores OnlyBrendan2022/05/20 07:42 PM
                                                                Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/20 11:06 PM
                                                                  Sierra Forest Xeons - E Cores Onlyanon22022/05/21 12:45 AM
                                                                    Sierra Forest Xeons - E Cores OnlyDoug S2022/05/21 11:33 AM
                                                                      Sierra Forest Xeons - E Cores OnlyBrett2022/05/21 04:18 PM
                                                                      Sierra Forest Xeons - E Cores Onlyanon22022/05/22 12:32 AM
                                                                  Sierra Forest Xeons - E Cores Onlyrwessel2022/05/21 04:05 AM
                                                                  Sierra Forest Xeons - E Cores OnlyBrendan2022/05/21 09:36 AM
                                                                    Sierra Forest Xeons - E Cores OnlyAndrey2022/05/21 10:30 AM
                                                                      Sierra Forest Xeons - E Cores OnlyBrendan2022/05/21 11:58 AM
                                                                        Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/21 03:58 PM
                                                                          Sierra Forest Xeons - E Cores Only-.-2022/05/21 06:03 PM
                                                                          Sierra Forest Xeons - E Cores OnlyBrendan2022/05/22 10:18 AM
                                                                            Sierra Forest Xeons - E Cores OnlyAndrey2022/05/22 03:18 PM
                                                                              Sierra Forest Xeons - E Cores OnlyBrendan2022/05/22 07:41 PM
                                                                                Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/22 08:49 PM
                                                                                  Proposal for heterogeneous runtime dispatchJan Wassenberg2022/05/22 10:11 PM
                                                                                    Proposal for heterogeneous runtime dispatchJörn Engel2022/05/22 10:51 PM
                                                                                      Proposal for heterogeneous runtime dispatchAdrian2022/05/22 11:25 PM
                                                                                        CorrectionAdrian2022/05/22 11:34 PM
                                                                                      Proposal for heterogeneous runtime dispatchJan Wassenberg2022/05/22 11:41 PM
                                                                                    Proposal for heterogeneous runtime dispatchUngo2022/05/23 12:27 AM
                                                                                      Proposal for heterogeneous runtime dispatchMichael S2022/05/23 02:14 AM
                                                                                      Heterogeneous ISA?Jan Wassenberg2022/05/23 05:11 AM
                                                                                        RISC-VPeter Lewis2022/05/30 02:45 PM
                                                                                          RISC-VHeikki Kultala2022/05/31 07:59 AM
                                                                                            RISC-VPeter Lewis2022/05/31 03:34 PM
                                                                                              RISC-VDoug S2022/05/31 11:45 PM
                                                                                                RISC-VPeter Lewis2022/06/01 02:55 PM
                                                                                                  RISC-VDoug S2022/06/01 08:50 PM
                                                                                                    RISC-V Eric Fink2022/06/01 11:20 PM
                                                                                                      Process...Anon2022/06/01 11:35 PM
                                                                                                        Process...Peter Lewis2022/06/02 12:54 AM
                                                                                                        Process...Michael S2022/06/02 03:42 AM
                                                                                                        Process...Eric Fink2022/06/02 04:43 AM
                                                                                                          Process...---2022/06/02 12:06 PM
                                                                                                            Process...Peter Lewis2022/06/02 01:01 PM
                                                                                                              Process... ItaniumRichard S2022/06/02 04:14 PM
                                                                                                                ItaniumPeter Lewis2022/06/02 05:07 PM
                                                                                                                  ItaniumRichard S2022/06/02 08:27 PM
                                                                                                                Process... ItaniumMichael S2022/06/03 03:39 AM
                                                                                                                  Process... ItaniumAdrian2022/06/03 04:26 AM
                                                                                                                    Process... ItaniumMichael S2022/06/03 05:32 AM
                                                                                                                      Process... ItaniumAdrian2022/06/03 06:14 AM
                                                                                                              Process...Doug S2022/06/02 09:54 PM
                                                                                                                Process...Peter Lewis2022/06/03 12:19 AM
                                                                                                            Process...Mark Roulo2022/06/02 07:15 PM
                                                                                                              Process...Michael S2022/06/03 04:06 AM
                                                                                                            Process...Brendan2022/06/02 08:13 PM
                                                                                                          Process...anon22022/06/02 03:13 PM
                                                                                                            Process...Eric Fink2022/06/02 09:00 PM
                                                                                                              Process...Michael S2022/06/03 04:16 AM
                                                                                                                Process...Doug S2022/06/03 07:57 AM
                                                                                                                  Process...James2022/06/04 03:46 AM
                                                                                                                    Process...Doug S2022/06/04 08:04 AM
                                                                                                                      Process...Anon42022/06/04 09:31 AM
                                                                                                                      Process...James2022/06/04 09:49 AM
                                                                                                          Process...Anon2022/06/05 01:55 AM
                                                                                                        There is no 5nm or 7nm anywhere.Heikki Kultala2022/06/02 09:45 AM
                                                                                                          There is no 5nm or 7nm anywhere.Doug S2022/06/02 10:10 AM
                                                                                                            There is no 5nm or 7nm anywhere.Heikki Kultala2022/06/02 10:50 AM
                                                                                                            There is no 5nm or 7nm anywhere.Peter Lewis2022/06/02 11:07 AM
                                                                                                            There is no 5nm or 7nm anywhere.anon22022/06/02 03:30 PM
                                                                                                          There is no 5nm or 7nm anywhere.Anon2022/06/05 12:41 AM
                                                                                                    RISC-VPeter Lewis2022/06/02 12:22 AM
                                                                                                      RISC-VFreddie2022/06/02 06:22 AM
                                                                                                        RISC-V---2022/06/02 12:25 PM
                                                                                                    RISC-VAdrian2022/06/02 12:47 AM
                                                                                                      RISC-VDoug S2022/06/02 10:18 AM
                                                                                                      x86 vs RISCHeikki Kultala2022/06/02 11:04 AM
                                                                                                        x86 vs RISCAnon2022/06/02 01:49 PM
                                                                                                          x86 vs RISCTim Mc2022/06/02 03:20 PM
                                                                                                          x86 vs RISCDoug S2022/06/02 10:01 PM
                                                                                                            x86 vs RISCAnon2022/06/05 12:55 AM
                                                                                                              x86 vs RISCPeter Lewis2022/06/05 03:23 PM
                                                                                                                x86 vs RISCAnon2022/06/05 03:32 PM
                                                                                                                Register Windows.Mark Roulo2022/06/06 08:56 AM
                                                                                                                  Register Windows.blaine2022/06/06 12:51 PM
                                                                                                                    S/W managed TLB missesMark Roulo2022/06/06 01:18 PM
                                                                                                                      S/W managed TLB missesMichael S2022/06/06 01:31 PM
                                                                                                                      S/W managed TLB missesblaine2022/06/06 10:53 PM
                                                                                                                      S/W managed TLB missesvonk2022/06/07 12:04 AM
                                                                                                                      S/W managed TLB missesDoug S2022/06/07 07:50 AM
                                                                                                                        S/W managed TLB missesanon22022/06/07 09:21 PM
                                                                                                                          S/W managed TLB missesJames2022/06/08 01:07 AM
                                                                                                                            S/W managed TLB missesMichael S2022/06/08 01:20 AM
                                                                                                                            S/W managed TLB missesanon22022/06/08 01:53 AM
                                                                                                                          Fairchild Clipper had h/w table walkPaul A. Clayton2022/06/09 11:46 AM
                                                                                                                            Fairchild Clipper had h/w table walkSimon Farnsworth2022/06/10 12:58 AM
                                                                                                                    Register Windows.anon22022/06/06 02:21 PM
                                                                                                        x86 vs RISCEric Fink2022/06/02 09:11 PM
                                                                                                          x86 vs RISCMichael S2022/06/03 05:49 AM
                                                                                                            x86 vs RISCBrett2022/06/03 11:32 AM
                                                                                                            x86 vs RISCAnon2022/06/05 01:23 AM
                                                                                                        x86 vs RISCAdrian2022/06/02 10:47 PM
                                                                                                      RISC-VAnon2022/06/02 01:33 PM
                                                                                                  RISC-V lifespan; encodings2022/06/04 10:39 AM
                                                                                                    µop CachePeter Lewis2022/06/04 05:56 PM
                                                                                                      x86 decode cores2022/06/04 11:32 PM
                                                                                                        x86 decode coresPeter Lewis2022/06/05 12:26 AM
                                                                                                        x86 decode coresPeter Lewis2022/06/06 03:22 AM
                                                                                                      µop CacheDoug S2022/06/05 10:08 AM
                                                                                                    RISC-V lifespan; encodingsEric Fink2022/06/05 03:26 AM
                                                                                                      RISC-V lifespan; encodings2022/06/05 06:37 AM
                                                                                                        RISC-V lifespan; encodingsanonymou52022/06/05 11:32 AM
                                                                                                          RISC-V lifespan; encodingsAnon2022/06/05 02:09 PM
                                                                                                          RISC-V lifespan; encodings2022/06/06 06:52 AM
                                                                                                            RISC-V lifespan; encodingsanonymou52022/06/06 07:07 AM
                                                                                                              RISC-V lifespan; encodingsAdrian2022/06/06 09:59 AM
                                                                                                                RISC-V lifespan; encodingsAnon2022/06/06 11:38 AM
                                                                                                                  RISC-V lifespan; encodingsAdrian2022/06/07 12:21 AM
                                                                                                                    RISC-V lifespan; encodingsMichael S2022/06/07 01:23 AM
                                                                                                                      RISC-V lifespan; encodingsAdrian2022/06/07 04:20 AM
                                                                                                                        RISC-V lifespan; encodingsBrett2022/06/07 05:04 PM
                                                                                                                          RISC-V lifespan; encodingsAnon2022/06/07 08:58 PM
                                                                                                                            RISC-V lifespan; encodings2022/06/08 07:07 AM
                                                                                                                              RISC-V lifespan; encodingsAnon2022/06/08 09:25 AM
                                                                                                                                RISC-V lifespan; encodings2022/06/08 11:07 AM
                                                                                                                RISC-V lifespan; encodingsBrett2022/06/06 12:50 PM
                                                                                                                  RISC-V lifespan; encodingsAdrian2022/06/06 11:59 PM
                                                                                                              RISC-V lifespan; encodingsAdrian2022/06/06 09:59 AM
                                                                                                              RISC-V lifespan; encodings2022/06/06 10:08 AM
                                                                                                    RISC-V lifespan; encodings---2022/06/05 05:12 PM
                                                                                                      RISC-V lifespan; encodingsAnon2022/06/05 05:48 PM
                                                                                                      RISC-V lifespan; encodingsJukka Larja2022/06/05 09:18 PM
                                                                                                        Profile-Guided OptimizationPeter Lewis2022/06/06 02:55 AM
                                                                                                          Profile-Guided Optimizationrwessel2022/06/06 04:26 AM
                                                                                                            Profile-Guided OptimizationDoug S2022/06/06 09:44 AM
                                                                                                              Profile-Guided OptimizationAndrew Clough2022/06/06 10:08 AM
                                                                                                              Profile-Guided Optimizationrwessel2022/06/06 10:57 AM
                                                                                                                Example of JIT cacheMark Roulo2022/06/06 01:10 PM
                                                                                                                  Example of JIT cacherwessel2022/06/06 01:59 PM
                                                                                                                    Example of JIT cacheMark Roulo2022/06/07 05:40 AM
                                                                                                                      Example of JIT cacherwessel2022/06/07 06:46 AM
                                                                                                              Profile-Guided OptimizationSimon Farnsworth2022/06/07 01:47 AM
                                                                                                          Profile-Guided OptimizationJukka Larja2022/06/06 07:42 PM
                                                                                                      Accurate branch prediction is not everythingPaul A. Clayton2022/06/14 10:48 AM
                                                                                                        Accurate branch prediction is not everything---2022/06/14 12:40 PM
                                                                                                          Accurate branch prediction is not everythingJames2022/06/14 02:41 PM
                                                                                                        Accurate branch prediction is not everythingdmcq2022/06/15 08:38 AM
                                                                                                          Accurate branch prediction is not everythingnone2022/06/15 08:57 AM
                                                                                                            Accurate branch prediction is not everythingdmcq2022/06/15 09:23 AM
                                                                                                            Accurate branch prediction is not everythingDoug S2022/06/15 12:55 PM
                                                                                                              Accurate branch prediction is not everythingdmcq2022/06/15 03:38 PM
                                                                                                Adding Neural Engines to x86Peter Lewis2022/06/04 06:06 PM
                                                                                                  Adding Neural Engines to x86Freddie2022/06/05 11:07 AM
                                                                                                    Adding Neural Engines to x86Peter Lewis2022/06/05 03:20 PM
                                                                                                      Adding Neural Engines to x86---2022/06/05 05:40 PM
                                                                                                        Adding Neural Engines to x86Peter Lewis2022/06/05 08:22 PM
                                                                                                  Adding Neural Engines to x86---2022/06/05 05:34 PM
                                                                                                    Missing metricsAnon2022/06/05 05:59 PM
                                                                                                    Adding Neural Engines to x86Peter Lewis2022/06/06 02:41 AM
                                                                                            RISC-VJan Wassenberg2022/05/31 09:00 PM
                                                                                              RISC-VPeter Lewis2022/06/01 03:02 PM
                                                                                                RISC-VJan Wassenberg2022/06/01 09:17 PM
                                                                                              RISC-V Eric Fink2022/06/01 11:25 PM
                                                                                                RISC-VJan Wassenberg2022/06/02 10:10 PM
                                                                                                  RISC-VEric Fink2022/06/02 11:23 PM
                                                                                                    RISC-VJan Wassenberg2022/06/03 10:10 PM
                                                                                                      RISC-VJukka Larja2022/06/03 11:15 PM
                                                                                                        RISC-VJan Wassenberg2022/06/04 10:23 PM
                                                                                                      RISC-VEric Fink2022/06/04 04:59 AM
                                                                                                        RISC-VJan Wassenberg2022/06/04 10:14 PM
                                                                                                    RISC-VLinus Torvalds2022/06/04 09:17 AM
                                                                                                      RISC-V-.-2022/06/04 04:56 PM
                                                                                                        RISC-VLinus Torvalds2022/06/04 07:00 PM
This Post has been deleted
                                                                                                      RISC-VEric Fink2022/06/05 03:31 AM
                                                                                                        SIMD in parsingWilco2022/06/05 04:40 AM
                                                                                                          SIMD in parsingFoo_2022/06/06 01:19 AM
                                                                                                            SIMD in parsingMichael S2022/06/06 01:43 AM
                                                                                                              SIMD in parsingLinus Torvalds2022/06/06 08:40 AM
                                                                                                          SIMD in parsing-.-2022/06/08 04:28 AM
                                                                                              RISC-V V-extensionHeikki Kultala2022/06/02 09:40 AM
                                                                                                RISC-V V-extensionJan Wassenberg2022/06/02 10:09 PM
                                                                                            RISC-VPer Hesselgren2022/06/01 04:40 AM
                                                                                    Proposal for heterogeneous runtime dispatchBrendan2022/05/23 12:51 AM
                                                                                    Proposal for heterogeneous runtime dispatchBrendan2022/05/23 12:51 AM
                                                                                      Proposal for heterogeneous runtime dispatchBjörn Ragnar Björnsson2022/05/23 04:41 PM
                                                                                        Proposal for heterogeneous runtime dispatchJan Wassenberg2022/05/23 09:38 PM
                                                                                          Proposal for heterogeneous runtime dispatchJukka Larja2022/05/24 01:48 AM
                                                                                            Proposal for heterogeneous runtime dispatchJan Wassenberg2022/05/24 03:35 AM
                                                                                              Proposal for heterogeneous runtime dispatchJukka Larja2022/05/24 06:38 AM
                                                                                                Proposal for heterogeneous runtime dispatchJan Wassenberg2022/05/28 11:51 PM
                                                                                          Proposal for heterogeneous runtime dispatchMichael S2022/05/24 02:48 AM
                                                                                            SIMD applicabilityJan Wassenberg2022/05/24 03:50 AM
                                                                                              Don't mix up SIMD support with AVX2 vs AVX-512 heterogeneityMark Roulo2022/05/24 06:41 AM
                                                                                                Don't mix up SIMD support with AVX2 vs AVX-512 heterogeneityJan Wassenberg2022/05/24 10:23 AM
                                                                                                  Don't mix up SIMD support with AVX2 vs AVX-512 heterogeneitySimon Farnsworth2022/05/24 12:56 PM
                                                                                                Don't mix up SIMD support with AVX2 vs AVX-512 heterogeneityBrendan2022/05/24 04:09 PM
                                                                                                  Don't mix up SIMD support with AVX2 vs AVX-512 heterogeneityDoug S2022/05/24 09:03 PM
                                                                                                    Don't mix up SIMD support with AVX2 vs AVX-512 heterogeneityBrendan2022/05/25 04:37 PM
                                                                                                  Don't mix up SIMD support with AVX2 vs AVX-512 heterogeneityJukka Larja2022/05/25 05:24 AM
                                                                                                    Don't mix up SIMD support with AVX2 vs AVX-512 heterogeneityBrendan2022/05/25 05:16 PM
                                                                                                      Don't mix up SIMD support with AVX2 vs AVX-512 heterogeneityJukka Larja2022/05/25 07:50 PM
                                                                                            Proposal for heterogeneous runtime dispatchAdrian2022/05/24 01:39 PM
                                                                                              Proposal for heterogeneous runtime dispatchJörn Engel2022/05/24 08:41 PM
                                                                                              Proposal for heterogeneous runtime dispatchJan Wassenberg2022/05/28 11:51 PM
                                                                                                Proposal for heterogeneous runtime dispatchAdrian2022/05/29 03:33 AM
                                                                                                  Proposal for heterogeneous runtime dispatchAdrian2022/05/29 03:48 AM
                                                                                                  Proposal for heterogeneous runtime dispatchJan Wassenberg2022/05/29 10:05 AM
                                                                                                    Proposal for heterogeneous runtime dispatchAdrian2022/05/29 12:39 PM
                                                                                                      turbostat instructionsJan Wassenberg2022/05/29 09:51 PM
                                                                                                  Proposal for heterogeneous runtime dispatchSome dude2022/05/30 11:04 AM
                                                                                          Proposal for heterogeneous runtime dispatchSimon Farnsworth2022/05/24 03:21 AM
                                                                                  Sierra Forest Xeons - E Cores OnlyBrendan2022/05/22 11:41 PM
                                                                                    Sierra Forest Xeons - E Cores OnlySimon Farnsworth2022/05/23 02:03 AM
                                                                                      Sierra Forest Xeons - E Cores OnlyBrendan2022/05/23 08:12 AM
                                                                                        Sierra Forest Xeons - E Cores OnlySimon Farnsworth2022/05/24 03:18 AM
                                                                                          Sierra Forest Xeons - E Cores Onlyrwessel2022/05/24 07:22 AM
                                                                                    Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/23 11:30 AM
                                                                                      Sierra Forest Xeons - E Cores OnlyBrendan2022/05/23 12:13 PM
                                                                                        Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/23 03:54 PM
                                                                                          Sierra Forest Xeons - E Cores Only2022/05/24 10:49 AM
                                                                                            Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/24 11:11 AM
                                                                                              Sierra Forest Xeons - E Cores Only2022/05/24 02:12 PM
                                                                                                Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/24 03:33 PM
                                                                                          Sierra Forest Xeons - E Cores OnlyBrendan2022/05/24 12:44 PM
                                                                                            Sierra Forest Xeons - E Cores OnlySimon Farnsworth2022/05/24 01:14 PM
                                                                                              Sierra Forest Xeons - E Cores Only2022/05/24 02:37 PM
                                                                                                Sierra Forest Xeons - E Cores OnlyJames2022/05/26 02:42 AM
                                                                                              Sierra Forest Xeons - E Cores OnlyBrendan2022/05/24 08:53 PM
                                                                                              Sierra Forest Xeons - E Cores OnlyJörn Engel2022/05/24 11:09 PM
                                                                                                Sierra Forest Xeons - E Cores OnlySimon Farnsworth2022/05/25 01:27 AM
                                                                                                  Sierra Forest Xeons - E Cores OnlyJan Wassenberg2022/05/28 11:49 PM
                                                                                                    Sierra Forest Xeons - E Cores OnlyMichael S2022/05/29 01:15 AM
                                                                                                      Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/29 09:48 AM
                                                                                                        Sierra Forest Xeons - E Cores Onlyanonymou52022/05/29 10:35 AM
                                                                                                          Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/30 10:07 AM
                                                                                                            Sierra Forest Xeons - E Cores Onlyanonymou52022/05/30 11:46 AM
                                                                                                        Sierra Forest Xeons - E Cores OnlyMichael S2022/05/29 10:59 AM
                                                                                                      Sierra Forest Xeons - E Cores OnlyJan Wassenberg2022/05/29 10:20 AM
                                                                                                        Sierra Forest Xeons - E Cores OnlyMichael S2022/05/29 12:38 PM
                                                                                                          Sierra Forest Xeons - E Cores OnlyJörn Engel2022/05/29 01:10 PM
                                                                                                          Sierra Forest Xeons - E Cores Only-.-2022/05/29 04:28 PM
                                                                                                            Sierra Forest Xeons - E Cores OnlyMichael S2022/05/30 12:32 AM
                                                                                                              Sierra Forest Xeons - E Cores Only-.-2022/05/30 01:44 AM
                                                                                                                Sierra Forest Xeons - E Cores OnlyMichael S2022/05/30 02:12 AM
                                                                                                                  Sierra Forest Xeons - E Cores Only-.-2022/05/30 04:46 AM
                                                                                                          Sierra Forest Xeons - E Cores OnlyJan Wassenberg2022/05/29 09:48 PM
                                                                                                            quick radix mergeMichael S2022/05/30 12:02 AM
                                                                                                              quick radix mergeJan Wassenberg2022/05/30 06:16 AM
                                                                                                                quick radix mergeMichael S2022/05/30 07:36 AM
                                                                                                                  quick radix mergeJan Wassenberg2022/05/30 09:07 PM
                                                                                                                quick radix mergerwessel2022/05/30 08:36 AM
                                                                                      Sierra Forest Xeons - E Cores OnlyChristian Bornträger2022/05/24 07:06 AM
                                                                                        Sierra Forest Xeons - E Cores Onlyrwessel2022/05/24 07:40 AM
                                                                          Sierra Forest Xeons - E Cores Only2022/05/22 10:51 AM
                                                                            Sierra Forest Xeons - E Cores OnlyDoug S2022/05/22 07:52 PM
                                                                              Linux doesn't have a plan for hetero-ISA CPUs2022/05/23 05:03 AM
                                                                                Linux doesn't have a plan for hetero-ISA CPUsDoug S2022/05/23 07:35 AM
                                                                                  Linux doesn't have a plan for hetero-ISA CPUsBrendan2022/05/23 10:44 AM
                                                                                    Linux doesn't have a plan for hetero-ISA CPUsGionatan Danti2022/05/24 05:29 AM
                                                                            Sierra Forest Xeons - E Cores OnlySimon Farnsworth2022/05/23 03:16 AM
                                                                    Sierra Forest Xeons - E Cores OnlyJukka Larja2022/05/21 09:23 PM
                                                          well said (NT)Michael S2022/05/21 10:48 AM
                                                  Sierra Forest Xeons - E Cores OnlyMichael S2022/05/19 04:00 AM
                                                  Sierra Forest Xeons - E Cores Only-.-2022/05/19 05:25 AM
                                                    Sierra Forest Xeons - E Cores OnlyMichael S2022/05/20 05:29 AM
                                                  Sierra Forest Xeons - E Cores Onlyanonymou52022/05/19 08:46 AM
                                                    Sierra Forest Xeons - E Cores OnlyCharlie Burnes2022/05/19 01:19 PM
                                                      Sierra Forest Xeons - E Cores OnlyAdrian2022/05/19 11:29 PM
                                              Lack of Backward Compatibility for Intel AVX512Adrian2022/05/18 10:57 PM
                                                Lack of Backward Compatibility for Intel AVX512Brett2022/05/19 09:55 AM
                                                  Lack of Backward Compatibility for Intel AVX512Michael S2022/05/19 10:53 AM
                                                  Lack of Backward Compatibility for Intel AVX512Adrian2022/05/19 11:38 PM
                              Backward Compatibility for SVE2 Code---2022/05/17 01:57 PM
                                Backward Compatibility for SVE2 CodeCharlie Burnes2022/05/17 03:12 PM
                                Backward Compatibility for SVE2 Codeanon12022/05/18 01:44 AM
                                  Backward Compatibility for SVE2 CodeSimon Farnsworth2022/05/18 02:03 AM
                                    Backward Compatibility for SVE2 CodeDoug S2022/05/18 09:14 AM
                                      Backward Compatibility for SVE2 Codedmcq2022/05/20 04:43 AM
                                        Backward Compatibility for SVE2 CodeDoug S2022/05/20 09:07 AM
                                          Backward Compatibility for SVE2 Codedmcq2022/05/21 07:35 AM
                                            Backward Compatibility for SVE2 Codedmcq2022/05/21 07:57 AM
                                  Backward Compatibility for SVE2 Code---2022/05/18 08:56 AM
                      Backward Compatibility for SVE2 CodeJan Wassenberg2022/05/17 11:26 AM
                        Backward Compatibility for SVE2 Code---2022/05/17 02:01 PM
                        Use of Highway to provide backward compatibilityCharlie Burnes2022/05/18 02:55 PM
                          Use of Highway to provide backward compatibilityBrett2022/05/18 07:57 PM
                            Use of Highway to provide backward compatibilityJan Wassenberg2022/05/18 09:16 PM
                              Use of Highway to provide backward compatibilityCharlie Burnes2022/05/18 10:03 PM
                                Use of Highway to provide backward compatibilityBrett2022/05/18 10:20 PM
                                  Use of Highway to provide backward compatibility---2022/05/19 12:20 PM
                                    Use of Highway to provide backward compatibilityCharlie Burnes2022/05/19 02:05 PM
                                      Use of Highway to provide backward compatibilityBrett2022/05/19 03:18 PM
                                        Use of Highway to provide backward compatibilityCharlie Burnes2022/05/19 06:29 PM
                                          Use of Highway to provide backward compatibilityJan Wassenberg2022/05/19 08:12 PM
                                            Use of Highway to provide backward compatibilityBrett2022/05/19 09:38 PM
                                            Use of Highway to provide backward compatibilityCharlie Burnes2022/05/21 06:48 AM
                                              Use of Highway to provide backward compatibilityCharlie Burnes2022/05/21 11:36 AM
                                              Use of Highway to provide backward compatibilityJan Wassenberg2022/05/21 09:45 PM
                                                Use of Highway to provide backward compatibilityCharlie Burnes2022/05/22 06:52 AM
        Questions About Apple's AVX512dmcq2022/05/13 03:24 PM
      Questions About Apple's AVX512Matt Lohmann2022/05/13 12:32 PM
        Questions About Apple's AVX512---2022/05/13 01:09 PM
        Questions About Apple's AVX512Anon12022/05/13 02:55 PM
          Questions About Apple's AVX512Matt Lomann2022/05/13 06:02 PM
            Questions About Apple's AVX512---2022/05/13 08:03 PM
            Questions About Apple's AVX512Simon Farnsworth2022/05/14 05:11 AM
              Questions About Apple's AVX512---2022/05/14 11:06 AM
        Questions About Apple's AVX512Adrian2022/05/13 11:35 PM
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