Is scalar x86 decode that easy?

Article: AMD's Mobile Strategy
By: Linus Torvalds (torvalds.delete@this.linux-foundation.org), December 16, 2011 12:09 pm
Room: Moderated Discussions
Paul A. Clayton (paaronclayton@gmail.com) on 12/15/11 wrote:
>
>Finding the start of instructions can be substantially
>simplified with predecode adding a continue/start bit for
>each byte. (Intel seems to manage even without this
>assistance.)

It's not *that* bad.

You can have an almost arbitrary amount of prefixes, but
you can do the "is this a prefix" check fairly cheaply and
in parallel for the whole line (or partial line, whatever
your I$ fetch width is). Then finding the "real" instruction
is just a matter of checking the result - a few bits.

At the same time you did the "is this a prefix" thing, you
do the "what does this prefix do" in parallel, and generate
a separate set of control bits for that - to be used by
the instruction decode.

And while the multi-byte instructions look complicated,
the first bytes can essentially be considered to be "prefix"
bytes too from an instruction decode standpoint - instead of
changing address size or register numbers or things like
that, it just modifies the instruction lookup itself.

So you can see pretty much all x86 instructions as being
a single byte - with the fairly simple prefixes.

Then, that byte does conditionally have extra stuff at the
end - usually a case of "modrm and/or immediate". But the
modrm stuff is actually very regular (and the immediate
is obviously not complicated). It's just that the regularity
is "odd" - but it's odd for humans, not so much for some
digital logic. It's the usual kind of "wires to move bits
around, with certain bits meaning certain things".

So scalar x86 decoding really isn't that hard. You would
definitely not need to bother with predecode for that. Just
look at the 8086 - it was 30k transistors total, and
while it did everything serially (ie one prefix byte a
cycle), you still have to realize how little that is. The
basic decoding really isn't hard.

And the patterns are all the same still. Sure, there are
new prefixes and the size of the constants have changed.
And yes, the REX bytes have register bit numbers in odd
new places, but again - that's the kind of thing that looks
complicated to a human, but spreading things out is just
"wires" to digital logic. So one of the control wires that
comes from the prefix decode logic ends up being used as the
high bit of a register number? Big deal. It's just an oddly
wired up line.

And the "instruction" byte isn't just a solid 8 bits either,
the same way the register bits aren't just three consecutive
bits any more. There's the mode bits, there's the bits that
come in from the prefix decode (ie the "multi-byte"
instructions, there's the modification bits that come from
the modrm byte etc. So instead of a simple 8-bit lookup,
the instruction lookup uses a few more bits. Not exactly
complex, just "details". The number of bits have grown
since the 8086, but there's a lot of the same structure.

And the new modes have changed the modrm bytes, but again,
you can see those as just having a perhaps 12-bit wide
modrm byte instead of the standard 8 bits - it's just that
the extra bits come from odd places (REX decode, CR0 mode
register etc) rather than from the "instruction byte"
itself.

So it's a lot of detail, and you would want to try
to share as much logic from older designs as possible rather
than try to create an all-new decoder ever time. You have
all those tricks you learnt from last time.

You don't need to do it in one cycle either. Almost nobody
does instruction fetch/decode as a single cycle, and you
can do part of this "as you fetch" things from the L1 etc.

So doing a single x86 instruction is pretty easy. There are
dependencies, but most of them are simple, ie the number
of prefixes don't really change much anything at all if you
just are willing to do the compares in parallel.

Doing multiple instructions in parallel is "more of the
same", except it's obviously quite a lot more.

I suspect the natural thing to do in some respects
is not actually to "decode X instructions", it's to some
degree much more natural to do "decode X bytes, and find
up to N instructions in those X bytes".

Because a fair amount of the work is about single bytes,
and for each byte doing "if this is a prefix, it means X,
if it's a modrm byte it means Y". Based on that output,
you can then use some fairly simple "scan this set of bits
to find where the instructions start", and by then you've
actually done most of the decoding too.

The fact that instructions aren't aligned means that in
order to get at least 16 bytes of instruction, a natural
layout would be two 16-byte aligned blocks. So you might
have a total of 32 bytes you are scanning at a time.

Or you might have some limited shifter at fetch time that
gets you "160 bits of instruction data, 4-byte aligned" or
whatever - the details really aren't all that important,
the point is just that you end up having some "block of
data" that you do parallel byte decoding on.

And no, I've ever only done decoding in software, but all
the things that were annoying about software decode, like
shifting and merging bits, and looking up tables etc are
all pretty simple for hw.

And I only did a single instruction at a time, obviously.
You could try to do parallel decode tricks with SSE, I
guess, but that sounds like seriously dubious value when
you then have to handle them serially in software anyway ;)

Linus
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TopicPosted ByDate
AMD's Mobile StrategyMark Pillsbury2011/12/14 06:58 PM
  ARM vs. x86 is irrelevant from an energy efficiency POV Daniel Bizo2011/12/15 05:30 AM
    ARM vs. x86 is irrelevant from an energy efficiency POV Foo_2011/12/15 06:08 AM
    ARM vs. x86 is irrelevant from an energy efficiency POV an2011/12/15 06:25 AM
      ARM vs. x86 is irrelevant from an energy efficiency POV Azazel2011/12/15 09:50 PM
        ARM vs. x86 is irrelevant from an energy efficiency POV Mike C2011/12/22 02:14 PM
          ARM vs. x86 is irrelevant from an energy efficiency POV Michael S2011/12/23 07:06 AM
        ARM vs. x86 is irrelevant from an energy efficiency POV Mike C2011/12/23 08:07 PM
    ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/15 07:46 AM
      ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/15 10:32 AM
        ARM vs. x86 is irrelevant from an energy efficiency POV a person2011/12/15 10:59 AM
        ARM vs. x86 is irrelevant from an energy efficiency POV Michael S2011/12/15 11:18 AM
          ARM vs. x86 is irrelevant from an energy efficiency POV anon2011/12/16 07:22 PM
            ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/17 06:56 AM
              Thumb vs ARM instruction countsnone2011/12/17 11:15 AM
                Thumb vs ARM instruction countsWilco2011/12/22 07:50 AM
                  Thumb vs ARM instruction countsExophase2011/12/22 08:56 AM
        ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/15 11:44 AM
          ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/15 03:24 PM
            ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/15 04:15 PM
              ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/15 04:51 PM
                ARM vs. x86 is irrelevant from an energy efficiency POV anon2011/12/15 05:32 PM
                  ARM vs. x86 is irrelevant from an energy efficiency POV David Kanter2011/12/15 06:57 PM
                    ARM vs. x86 is irrelevant from an energy efficiency POV anon2011/12/15 08:58 PM
                      ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/16 12:27 AM
                    Is scalar x86 decode that easy?Paul A. Clayton2011/12/15 09:20 PM
                      Is scalar x86 decode that easy?Linus Torvalds2011/12/16 12:09 PM
                        Is scalar x86 decode that easy?EduardoS2011/12/17 10:03 AM
                        Is scalar x86 decode that easy?Ricardo B2011/12/17 02:21 PM
                          Is scalar x86 decode that easy?Megol2011/12/18 05:23 AM
                            Is scalar x86 decode that easy?rwessel2011/12/18 10:04 AM
                              Is scalar x86 decode that easy?Megol2011/12/18 10:38 AM
                              Is scalar x86 decode that easy?Linus Torvalds2011/12/18 12:15 PM
                                Is scalar x86 decode that easy?Ricardo B2011/12/18 01:57 PM
                                  Is scalar x86 decode that easy?Linus Torvalds2011/12/18 02:49 PM
                    ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/16 12:00 AM
                    ARM vs. x86 is irrelevant from an energy efficiency POV anon2011/12/17 12:13 PM
                      Conditional comparesMichael S2011/12/17 01:05 PM
                        Conditional comparesEduardoS2011/12/17 01:32 PM
                ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/15 05:56 PM
                  ARM free to innovate?Paul A. Clayton2011/12/15 09:14 PM
                  ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/16 10:01 AM
                    ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/16 02:33 PM
                      ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/16 06:30 PM
                        ARM vs. x86 is irrelevant from an energy efficiency POV rwessel2011/12/17 12:51 AM
                          ARM vs. x86 is irrelevant from an energy efficiency POV Octoploid2011/12/17 07:46 AM
                          ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/17 10:56 AM
                        ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/17 07:45 AM
                          ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/17 11:31 AM
                            ARM vs. x86 is irrelevant from an energy efficiency POV anon2011/12/21 09:12 AM
                          ARM vs. x86 is irrelevant from an energy efficiency POV David Kanter2011/12/17 02:16 PM
                            ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/17 03:30 PM
                            ARM vs. x86 is irrelevant from an energy efficiency POV none2011/12/17 05:00 PM
                              ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/17 05:29 PM
                            ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/17 05:45 PM
                        ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/20 10:24 AM
                          ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/20 01:07 PM
                            ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/20 07:19 PM
                              ARM vs. x86 is irrelevant from an energy efficiency POV EduardoS2011/12/20 07:40 PM
                                ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/20 08:02 PM
                                  ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/20 08:49 PM
                                    ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/20 08:59 PM
                                      ARM vs. x86 is irrelevant from an energy efficiency POV Michael S2011/12/21 03:49 AM
                                        ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/21 10:10 AM
                                      ARM vs. x86 is irrelevant from an energy efficiency POV gallier22011/12/21 06:41 AM
                                        ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/21 07:43 AM
                                          ARM vs. x86 is irrelevant from an energy efficiency POV Seni2011/12/21 09:28 AM
                                            ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/21 11:59 AM
                                              Cortex A9 latenciesS. Rao2011/12/21 09:12 PM
                                                Cortex A9 latenciesWilco2011/12/22 04:59 AM
                                            ARM vs. x86 is irrelevant from an energy efficiency POV gallier22011/12/22 01:25 AM
                                        ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/21 09:42 AM
                                          ARM vs. x86 is irrelevant from an energy efficiency POV gallier22011/12/22 02:02 AM
                                            ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/22 05:44 AM
                                              ARM vs. x86 is irrelevant from an energy efficiency POV gallier22011/12/22 07:57 AM
                                    (in)visibility of ISA featureshobold2011/12/21 06:27 AM
                              ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/20 07:51 PM
                                ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/20 08:13 PM
                                  ARM vs. x86 is irrelevant from an energy efficiency POV EduardoS2011/12/20 08:41 PM
                                    second to that (NT)Michael S2011/12/21 02:37 AM
                                  ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/20 09:03 PM
                                    ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/20 11:05 PM
                                      ARM vs. x86 is irrelevant from an energy efficiency POV Seni2011/12/21 02:22 AM
                                        ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/21 09:28 AM
                                          ARM vs. x86 is irrelevant from an energy efficiency POV Seni2011/12/21 10:06 AM
                                            ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/21 10:33 AM
                                              ARM vs. x86 is irrelevant from an energy efficiency POV Seni2011/12/21 11:03 AM
                                                ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/21 11:33 AM
                                                  Adding modes for flexible imm. sizesPaul A. Clayton2011/12/21 04:08 PM
                                                  ARM vs. x86 is irrelevant from an energy efficiency POV anonymous2011/12/21 10:57 PM
                                                    ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/21 11:12 PM
                                                      ARM vs. x86 is irrelevant from an energy efficiency POV anonymous2011/12/22 02:27 AM
                                                        ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/22 08:27 AM
                                                ARM vs. x86 is irrelevant from an energy efficiency POV Brett2011/12/21 11:36 PM
                                            ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/21 05:34 PM
                                              ARM vs. x86 is irrelevant from an energy efficiency POV Seni2011/12/21 06:53 PM
                                                ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/22 06:42 AM
                                                  ARM vs. x86 is irrelevant from an energy efficiency POV David Kanter2011/12/22 05:29 PM
                                                    ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/22 07:17 PM
                                                      ARM vs. x86 is irrelevant from an energy efficiency POV David Kanter2011/12/22 08:23 PM
                                                        ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/22 09:27 PM
                                                          Confused by AVX....David Kanter2011/12/23 12:05 AM
                                                            Celeron, PentiumMichael S2011/12/23 01:15 AM
                                                            Confused by AVX....S. Rao2011/12/23 01:27 AM
                                                            Confused by AVX....Gabriele Svelto2011/12/23 01:33 AM
                                                              Confused by AVX....David Kanter2011/12/23 12:58 PM
                                                                Confused by AVX....Gabriele Svelto2011/12/23 02:44 PM
                                      Load Single Register (pc-relative, literal load)Michael S2011/12/21 02:55 AM
                                        Load Single Register (pc-relative, literal load)Wilco2011/12/21 08:35 AM
                                          Load Single Register (pc-relative, literal load)Brett2011/12/22 12:20 AM
                                            Load Single Register (pc-relative, literal load)Exophase2011/12/22 08:32 AM
                                              Load Single Register (pc-relative, literal load)iz2011/12/22 05:45 PM
                                        Load Single Register (pc-relative, literal load)Exophase2011/12/21 09:34 AM
                                          Load Single Register (pc-relative, literal load)Wilco2011/12/21 04:29 PM
                                            Load Single Register (pc-relative, literal load)Exophase2011/12/22 08:37 AM
                                              Load Single Register (pc-relative, literal load)Brett2011/12/22 11:59 PM
                                          Load Single Register (pc-relative, literal load)Konrad Schwarz2011/12/27 05:07 AM
                                        Load Single Register (pc-relative, literal load)stubar2011/12/21 03:00 PM
                                          Load Single Register (pc-relative, literal load)Exophase2011/12/21 03:25 PM
                                            Load Single Register (pc-relative, literal load)Wilco2011/12/21 04:30 PM
                                              Load Single Register (pc-relative, literal load)anon2011/12/21 09:20 PM
                                                Load Single Register (pc-relative, literal load)Wilco2011/12/22 05:50 AM
                                                  Load Single Register (pc-relative, literal load)anon2011/12/22 06:11 AM
                                                    Load Single Register (pc-relative, literal load)Wilco2011/12/22 07:25 AM
                                      ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/21 08:18 PM
                                        ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/22 06:07 AM
                                          ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/22 10:56 AM
                                            idle philosophizing about localityhobold2011/12/23 08:26 AM
                                              Streaming needs regularity, not locality (NT)Rohit2011/12/23 01:32 PM
                                                Streaming needs regularity, not localityiz2011/12/24 12:38 AM
                                                Streaming needs regularity, not localityhobold2011/12/24 04:49 AM
                                                  Streaming needs regularity, not localityRohit2011/12/24 08:52 AM
                                                  Streaming needs regularity, not localityEBFE2011/12/25 06:30 PM
                                                    Streaming needs regularity, not localityRohit2011/12/25 09:42 PM
                                                      Streaming needs regularity, not localityEBFE2011/12/25 11:49 PM
                                                        Streaming needs regularity, not localityRohit2011/12/26 09:53 AM
                                    ARM vs. x86 is irrelevant from an energy efficiency POV mpx2011/12/21 02:57 AM
                                      ARM vs. x86 is irrelevant from an energy efficiency POV John Yates2011/12/26 10:46 AM
                                        Apollo Computer's DN10KBrett2011/12/26 06:56 PM
                                          Apollo Computer's DN10Kpeter huisken2011/12/27 07:40 AM
                                    ARM vs. x86 is irrelevant from an energy efficiency POV gallier22011/12/21 06:56 AM
                              ALU with shift; post-adjust, memcpyMichael S2011/12/21 03:22 AM
                                ALU with shift; post-adjust, memcpyExophase2011/12/21 09:02 AM
                                  memcpyMichael S2011/12/21 10:36 AM
                                    memcpyExophase2011/12/21 11:15 AM
                                    memcpyWilco2011/12/21 06:06 PM
                                      memcpyanon2011/12/21 09:15 PM
                                      memcpyMichael S2011/12/22 12:12 AM
                                        memcpyWilco2011/12/22 06:20 AM
                          Other x86 uop tricksDavid Kanter2011/12/20 07:21 PM
                            Other x86 uop tricksanon2011/12/20 07:35 PM
                              Other x86 uop tricksMichael S2011/12/21 03:55 AM
                            Other x86 uop tricksanon2011/12/20 07:53 PM
                            Other x86 uop tricksExophase2011/12/20 07:54 PM
                      stwxMichael S2011/12/17 10:46 AM
                        stwxWilco2011/12/17 11:33 AM
                          stwxMichael S2011/12/17 01:12 PM
            ARM vs. x86 is irrelevant from an energy efficiency POV mpx2011/12/16 11:06 AM
              ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/16 11:17 AM
                Reason for shared decoderPaul A. Clayton2011/12/16 11:45 AM
                  Reason for shared decoderanon2011/12/16 06:37 PM
                    Reason for shared decodermpx2011/12/17 06:20 AM
                      Reason for shared decoderanon2011/12/17 04:19 PM
                        Reason for shared decodermpx2011/12/18 07:21 AM
                          Reason for shared decoderanon2011/12/18 08:30 AM
                          Reason for shared decoderKira2011/12/18 09:00 PM
                ARM vs. x86 is irrelevant from an energy efficiency POV mpx2011/12/17 05:40 AM
                  ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/17 12:06 PM
                    ARM vs. x86 is irrelevant from an energy efficiency POV mpx2011/12/17 03:17 PM
        ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/16 12:10 AM
          ARM vs. x86 is irrelevant from an energy efficiency POV David Kanter2011/12/16 04:19 AM
          ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/16 10:14 AM
          ARM vs. x86 is irrelevant from an energy efficiency POV Eugene Nalimov2011/12/16 11:07 AM
            ARM vs. x86 is irrelevant from an energy efficiency POV Michael S2011/12/18 07:25 AM
              ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/18 12:48 PM
                ARM vs. x86 is irrelevant from an energy efficiency POV Michael S2011/12/18 04:01 PM
                  ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/18 05:21 PM
                    ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/18 07:56 PM
      x86 compatibility is not as important as Microsoft compatibilityBrett2011/12/15 08:13 PM
      You're completley missing the pictureDaniel Bizo2011/12/16 08:12 AM
        Missed referencesDaniel Bizo2011/12/16 08:16 AM
          Missed referencesnone2011/12/16 09:17 AM
            Missed referencesDaniel Bizo2011/12/16 09:29 AM
    ARM vs. x86 is irrelevant from an energy efficiency POV Gabriele Svelto2011/12/15 12:55 PM
    ARM vs. x86 is irrelevant from an energy efficiency POV someone2011/12/15 01:19 PM
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        6 GHz 2-core water-cooled processorgallier22011/12/20 01:31 AM
          "Benefit" of smaller market sharePaul A. Clayton2011/12/20 09:45 AM
            scalability of flash SSDSeni2011/12/20 11:22 AM
              USB drive price-point practical?Paul A. Clayton2011/12/20 12:49 PM
                USB drive price-point practical?Seni2011/12/20 02:02 PM
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                    A minor comment on utilitySeni2011/12/20 03:35 PM
                    A minor comment on utilityFoo_2011/12/21 07:06 AM
                      100" Big screen.pH72011/12/26 12:37 PM
                USB drive price-point practical?David Hess2011/12/20 05:25 PM
                  USB drive price-point practical?iz2011/12/20 06:08 PM
                    USB drive price-point practical?David Hess2011/12/21 07:54 AM
                      USB drive price-point practical?iz2011/12/21 11:21 PM
                  USB drive price-point practical?Ungo2011/12/20 06:36 PM
                    USB drive price-point practical?David Hess2011/12/21 07:48 AM
              scalability of flash SSDEduardoS2011/12/20 03:50 PM
                scalability of flash SSDSeni2011/12/20 06:41 PM
                  scalability of flash SSDEduardoS2011/12/20 06:50 PM
                    scalability of flash SSDSeni2011/12/20 07:24 PM
                      scalability of flash SSDEduardoS2011/12/20 07:51 PM
                        scalability of flash SSDanon2011/12/21 04:03 AM
                          scalability of flash SSDanon2011/12/21 05:21 AM
                            scalability of flash SSDEduardoS2011/12/21 01:32 PM
                              scalability of flash SSDanon2011/12/21 03:49 PM
                                scalability of flash SSDEduardoS2011/12/21 04:58 PM
                                  scalability of flash SSDanon2011/12/21 09:00 PM
                                    scalability of flash SSDEduardoS2011/12/22 02:58 AM
                                    scalability of flash SSDRicardo B2011/12/22 08:36 AM
              scalability of flash SSDWes Felter2011/12/20 05:53 PM
                scalability of flash SSDSeni2011/12/20 06:24 PM
                scalability of flash SSDiz2011/12/20 06:29 PM
        6 GHz 2-core water-cooled processorExophase2011/12/20 09:05 AM
          6 GHz 2-core water-cooled processorEduardoS2011/12/20 03:58 PM
            6 GHz 2-core water-cooled processorExophase2011/12/20 06:13 PM
              6 GHz 2-core water-cooled processorEduardoS2011/12/20 06:43 PM
                6 GHz 2-core water-cooled processorExophase2011/12/21 11:36 AM
                  6 GHz 2-core water-cooled processorSeni2011/12/21 12:11 PM
                    6 GHz 2-core water-cooled processorExophase2011/12/21 12:26 PM
                  Diatomic Helium? (NT)Paul A. Clayton2011/12/21 03:50 PM
                    Sorry, should have read further in thread! (NT)Paul A. Clayton2011/12/21 03:52 PM
      6 GHz 2-core water-cooled processorsomeone2011/12/20 10:09 AM
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  AMD's Mobile Strategypk2011/12/21 07:51 AM
    AMD's Mobile StrategyDavid Kanter2011/12/21 10:55 AM
      Samsung's fab technologyMark Roulo2011/12/21 11:34 AM
      AMD's Mobile StrategyAzazel2011/12/21 09:45 PM
        AMD's Mobile StrategyEduardoS2011/12/22 02:59 AM
          AMD's Mobile StrategyAzazel2011/12/22 10:03 PM
            AMD's Mobile StrategyEduardoS2011/12/22 11:51 PM
            AMD's Mobile StrategyVincent Diepeveen2011/12/24 11:15 AM
  AMD's Mobile StrategyAndrew Maizels2011/12/21 11:30 AM
  AMD's Mobile StrategyMr. Camel2011/12/27 09:50 AM
    AMD's Mobile StrategyMike C2011/12/27 11:01 PM
  Need for DifferentiationBill Henkel2011/12/29 12:22 PM
    Need for DifferentiationBrett2011/12/29 09:53 PM
      Need for DifferentiationVincent Diepeveen2011/12/30 11:29 AM
      Requested software features already in productCharles2011/12/30 09:35 PM
        Requested software features already in productSanjay B2012/01/11 04:45 PM
          Requested software features already in productBrett2012/01/11 10:18 PM
    Need for DifferentiationDavid Kanter2011/12/30 01:23 AM
      Need for DifferentiationVincent Diepeveen2011/12/30 11:17 AM
      Need for DifferentiationBill Henkel2012/01/03 07:01 PM
        Need for DifferentiationDavid Kanter2012/01/03 08:34 PM
    Need for DifferentiationVincent Diepeveen2011/12/30 11:09 AM
    L4 CacheBill Henkel2011/12/30 05:55 PM
      L4 CacheDavid Kanter2011/12/30 09:34 PM
        L4 CacheEduardoS2011/12/31 03:42 PM
          L4 CacheExophase2011/12/31 05:37 PM
      Need for speedDoug Siebert2011/12/31 01:07 PM
        Need for speedAlex M2012/01/06 03:38 PM
          Need for speedDoug Siebert2012/01/06 07:51 PM
        Need for speedTom J2012/01/10 04:44 PM
          Need for speedrwessel2012/01/10 05:30 PM
      L4 CacheRicardo B2011/12/31 02:25 PM
        L4 CacheBill Henkel2012/01/03 06:33 PM
          L4 CacheDavid Kanter2012/01/03 08:54 PM
            L4 Cache--not quite that bad?Paul A. Clayton2012/01/04 01:10 PM
              L4 Cache--not quite that bad?David Kanter2012/01/04 04:59 PM
                L4 Cache--not so bad (for Intel/IBM perhaps)Paul A. Clayton2012/01/04 08:01 PM
                L4 CacheBill Henkel2012/01/05 05:50 PM
                  Integration class price/performance tradeoffs?Paul A. Clayton2012/01/06 03:26 PM
                    Integration class price/performance tradeoffs?David Kanter2012/01/06 06:29 PM
                      InterposersMark Roulo2012/01/09 09:43 AM
                        InterposersDavid Kanter2012/01/10 12:13 PM
                    Integration class price/performance tradeoffs?Bill Henkel2012/01/06 06:52 PM
                      Beware of invention-stealing time travelers :-)Paul A. Clayton2012/01/06 08:31 PM
                        AMD PrototypePoindexter2012/01/07 06:20 AM
                    L4 Cache with Silicon InterposerTom J2012/01/08 05:50 PM
              L4 Cache--not quite that bad?rwessel2012/01/04 07:20 PM
                Temptation for expensive optimizationsPaul A. Clayton2012/01/04 08:20 PM
            L4 CacheDan Fay2012/01/04 05:51 PM
              L4 CacheRicardo B2012/01/04 06:39 PM
                L4 CacheDan Fay2012/01/04 06:57 PM
              L4 CacheKevin G2012/01/06 09:02 AM
          L4 CacheRicardo B2012/01/04 06:29 PM
            L4 CacheMichael S2012/01/05 07:21 AM
              L4 CacheRicardo B2012/01/05 11:01 AM
              L4 CacheRicardo B2012/01/06 06:06 AM
                L4 CacheMichael S2012/01/06 07:35 AM
                  Non-latency advantagesPaul A. Clayton2012/01/06 03:04 PM
                    Non-latency advantagesRicardo B2012/01/06 06:12 PM
                      Tag check delay??Paul A. Clayton2012/01/06 07:05 PM
                        Tag check delay??Ricardo B2012/01/06 08:18 PM
                          Thanks for sharingPaul A. Clayton2012/01/06 08:46 PM
            L4 Cachesomeone2012/01/08 05:06 PM
              L4 CacheRicardo B2012/01/08 06:28 PM
      L4 CacheVincent Diepeveen2012/01/08 02:11 PM
        L4 CacheJouni Osmala2012/01/09 03:24 AM
  Value of x86 in ServersGeorge Baker2012/01/04 10:55 AM
    Value of x86 in ServersDavid Kanter2012/01/05 02:40 AM
      Value of x86 in Serversrwessel2012/01/05 03:27 AM
        Value of x86 in ServersDavid Kanter2012/01/05 04:49 AM
      Value of x86 in ServersKira2012/01/09 05:22 PM
        Value of x86 in ServersJoel2012/01/09 09:20 PM
    Value of x86 in ServersDan Fay2012/01/05 09:03 AM
    Value of x86 in ServersAlex M2012/01/06 04:23 PM
    Value of x86 in ServersTom J2012/01/10 04:25 PM
      Value of x86 in Serversanon2012/01/11 12:44 PM
        Value of x86 in ServersGregory2012/01/12 06:11 PM
          x86 complexity or high-performance complexity?Paul A. Clayton2012/01/12 06:52 PM
          Value of x86 in ServersMichael S2012/01/13 06:39 AM
            Value of x86 in ServersRicardo B2012/01/13 03:14 PM
              Value of x86 in ServersMichael S2012/01/14 12:22 PM
  Heterogeneous ComputingAlex M2012/01/06 05:10 AM
    Thoughput != SIMDPaul A. Clayton2012/01/06 05:10 PM
  AMD's Processor StrategyJason Chan2012/01/10 06:06 AM
    AMD's Processor StrategyMark Roulo2012/01/10 06:21 PM
      AMD's Processor StrategyMegol2012/01/11 03:51 AM
        AMD's Processor StrategyDavid Hess2012/01/11 10:46 AM
    AMD's Processor StrategyAzazel2012/01/12 09:46 PM
      AMD's Processor StrategyVincent Diepeveen2012/01/13 06:28 AM
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