RISC-V lifespan; encodings

By: Adrian (a.delete@this.acm.org), June 7, 2022 4:20 am
Room: Moderated Discussions
Michael S (already5chosen.delete@this.yahoo.com) on June 7, 2022 2:23 am wrote:
> Adrian (a.delete@this.acm.org) on June 7, 2022 1:21 am wrote:
> >
> > "But someone could also have codes for common instruction sequences": yes, I agree.
> >
> > I believe that this is by far the most practical method of increasing the code
> > density, i.e. to add complex instructions to the ISA, but only if they are well
> > chosen, based on usage frequency, to be able to influence the code density.
> >
> >
> > While in general I have an extremely poor opinion of the RISC V ISA, which
> > I believe to be one of the worst of the more than 100 ISA with which I am
> > familiar, the RISC V ISA nonetheless includes a few very good features.
> >
> > By far the best feature of RISC V are the combined compare-and-branch instructions, even
> > if RISC V does not have all the comparison cases that would be needed in a complete ISA.
>
> Nios2 does have all reg-to-reg signed/unsigned comparison cases combined with branch.
> According to my code size managements, the improvement over RV is not noticeable.

I did not understand this sentence. If both Nios2 and RISC-V have combined compare-and-branch, why would Nios2 be expected to be better?

By RISC-V not having all the required conditional branches I have not referred to the 6 compare-and-branch instructions needed for the simple relations between signed or unsigned integers, which are included in the RISC-V ISA, but to other strictly necessary conditional branches that are missing, like testing for integer overflow, and to some other nice to have extra combined conditional branches, like test-under-mask-and-branch and some tests useful for loop termination.



>
> >
> > Because of the very high frequency of the conditional branches and because for almost
> > every such branch RISC-V saves a 32-bit word in comparison with AArch64, this allows the
> > length of many RISC-V programs to be competitive with that for AArch64, even if RISC-V
> > needs a lot of extra 32-bit words for a large part of the load/store instructions.
> >
> >
> > In my opinion, the easiest way to increase the code density of AArch64 would be to define a set
> > of compare-and-branch/test-under-mask-and-branch/branch-on-count/branch-on-index instructions.
> >
> > I have verified that there is enough free encoding space in the AArch64 branch instruction
> > block, to allow the encoding of all kinds of such instructions that would be needed.
> >
> > Conditional branches are usually 15% to 20% of all instructions and saving one 32-bit word for most
> > of them would cause a larger improvement in code density than almost any other encoding change.
> >
>
> My guess is that very significant part of compare|test instructions ahead of branch are of
> 'with immediate' variety. So, I expect much smaller gain than suggested by your analysis.
> In specific case of aarch64, another, probably even bigger, factor that reduces
> the potential gain is the fact ISA already has CBZ/CBNZ/TBZ/TBNZ.
>

CBZ/CBNZ is not a compare-and-branch, despite the name. There are only few cases when it can reduce the code size.

TBZ/TBNZ also reduces the code size only when it is enough to test a single bit, not a bit field.

Both instructions are useful, but, at least in my experience, they can be used only much more seldom than compare-and-branch and test-under-mask-and-branch.


>
> Generally, I disagree with your conclusion.
> 2 instruction sizes (16b/32b) is bigger density win than what is possible with very smart choice of combined
> sequences. 3 instruction sizes (16b/32b/48b or 16b/32b/40b, I'm not close on which one is better) is
> better yet, but by smaller increment over 2 sizes. The biggest win of 3 sizes is not so much a code density,
> but potentially better performance of narrow (1 or 2-wide) implementations of the ISA.
>
>

My conclusion was valid only while keeping the constraint of a fixed-length encoding.

I completely agree with you that a variable-length encoding using 16-bit multiples is certain to achieve a greater code density than any fixed-length encoding, even if the latter encodes some complex instructions.

I also agree about the advantage for small implementations.

However, for both purposes, ARM has Armv8-M and I do not think that there is any need in the near future to have an AArch64 version for such applications.

On the other hand, improving the code density of AArch64 with minimal changes is useful. The latest AArch64 implementations already have fusion for the compare and branch instruction pairs, so encoding them in a single word would not change anything else, except the decoder.


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TopicPosted ByDate
Apple's AVX512---2022/05/11 11:32 PM
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        Questions About Apple's AVX512---2022/05/13 01:05 PM
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              Questions About Apple's AVX512Michael S2022/05/14 11:27 AM
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                    Questions About Apple's AVX512Doug S2022/05/15 11:59 PM
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                  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
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                      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
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                                        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
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                                                Alternative to Highway for code that is not SIMD width agnosticJan Wassenberg2022/05/22 09:46 PM
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                                                  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
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                                          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
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                                              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
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                                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
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                                                      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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