RISC-V

By: --- (---.delete@this.redheron.com), June 2, 2022 1:25 pm
Room: Moderated Discussions
Freddie (freddie.delete@this.witherden.org) on June 2, 2022 7:22 am wrote:
> Peter Lewis (peter.delete@this.notyahoo.com) on June 2, 2022 1:22 am wrote:
> > ARM will increase the number of instructions decoded per clock, but the increase will be faster for ARM.
>
> A few points of note. Firstly, decode is less important than it used to be due to micro-op
> caches. Both Intel and AMD employ them and they have been growing in size substantially on
> a generation-to-generation basis. (Interestingly, they are also used in some non-Apple ARM
> designs too.) This mitigates a lot of the issues associated with variable length decoding.

Not just non-Apple ARM.
To go by patents (this is something hard to test experimentally) Apple have at least two additional tiers of "instruction micro-cache-like-things" between standard instruction cache on one side and loop buffer on the other side.

The *real win* (IMHO) in the current x86 and newest ARM versions, and apparently not yet implemented by Apple, is the elastic queue between Decode/Feed Decoded Instructions from micro-cache and Rename. This allows for one more balancing point between temporary bursts of excess supply and demand.
Apple's current scheme (tight coupling between Decode and Rename) may shave one cycle off recovery from any sort of flush/resteer, but it means that downstream doesn't get a bandwidth win from instructions discarded at Decode (either full discard like NOPs and non-conditional simple branches, or "effective" discards like fusing).

What *I* (and sure, what do I know?!) suspect would be Apple's best path going forward would be to
- widen fetch even further and allow for Decode of around 10 wide (plus feeding 10 or even 12 from the various micro-cache-like entities)
- a queue between Decode and Rename
- Rename that remains 8-wide (for now)
That means the hot, expensive, complex Rename can stay unchanged for now, but it will frequently run the full 8-wide rather than the many cases today where it runs substantially less because Decode threw away some instructions.

A next step would be to have Rename more flexible so rather than a fixed 8-wide, there would be various specific limits (6 physical registers allocated, 4 fp physical registers allocated, ...) and to some extent these could be mixed and matched so that for the right mix of instructions perhaps 10 or 11 instructions could be "Renamed" (ie have their allocations performed).
My guess is this is feasible (tough tough, and it may require Rename to be split over two cycles, though some of the work could be done at Decode) but I'm unaware of any CPU to actually implement it, so there may be trickiness/impossibility I am not seeing.
However the first step -- run your 8-wide Rename 8-wide for many more cycles -- is, I believe perfectly feasible and not even that tough.


> Secondly, just counting instructions is not sensible. Consider:
>
> vfnmadd231pd zmm21,zmm23,ZMMWORD PTR [rsi+0xb280]
>
> which is one x86 instruction but in ARM it would translate to four (two adds due to the size of
> the immediate, a load, and an FMA). Plus it would cost you a vector register to store the load
> and a GPR if you wanted to preserve the value of "rsi". On x86 that instruction is 10 bytes (and
> there is still room for a bigger immediate) whereas four ARM instructions are 16 bytes.
>
> > Because of the difficulty of decoding variable length instructions in parallel, x86 will favor wider
> > vectors than ARM. This is something we already see today with 512-bit vector operations (two of them
> > per clock) on x86 and 128-bit vector operations (four of them per clock) on Apple’s M1.
>
> SVE is likely to change this at least in higher performance (non mobile) SKUs. Graviton3
> on AWS has SVE-256 for example (but seems to only be able to issue 1.5 FMA's a cycle).
>
> Regards, Freddie.

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