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   comp.arch      Apparently more than just beeps & boops      131,241 messages   

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   Message 130,783 of 131,241   
   Robert Finch to BGB   
   Re: Variable-length instructions (1/2)   
   06 Jan 26 01:22:55   
   
   From: robfi680@gmail.com   
      
   On 2026-01-05 11:33 p.m., BGB wrote:   
   > On 1/5/2026 4:18 PM, MitchAlsup wrote:   
   >>   
   >> BGB  posted:   
   >>   
   >>> On 1/5/2026 5:22 AM, Michael S wrote:   
   >>>> On Mon, 5 Jan 2026 04:09:34 -0600   
   >>>> BGB  wrote:   
   >>>>   
   >>>>> On 1/4/2026 4:30 PM, MitchAlsup wrote:   
   >> ---------------------   
   >>>>>> I am 100% sure it is not as conveyed by Dickens !   
   >>>>>   
   >>>>> Looks it up, I am not sure what Dickens was going on about.   
   >>>>>   
   >>>>>   
   >>>>   
   >>>> “A wonderful fact to reflect upon, that every human creature is   
   >>>> constituted to be that profound secret and mystery to every other.”   
   >>>>   
   >>>> I suppose that Sartre wanted to say something else by ""L'enfer, c'est   
   >>>> les autres". May be, an exact opposite.   
   >>>>   
   >>>   
   >>> It gets confusing, but alas will at least admit that I don't understand   
   >>> most people.   
   >>>   
   >>>   
   >>> As I can note, my mind seems to be partly divided into multiple   
   >>> sub-personas, with different properties, but it is awkward to describe   
   >>> them. Socially, people are expected to see themselves as a singular   
   >>> entity; admittedly whatever this notion of "singularness" is, isn't   
   >>> particularly strong in my case. I would still be classified as   
   >>> self-aware though, as I do recognize my reflection in a mirror, etc.   
   >>   
   >> Sane people think there is a large gap between sane and insane.   
   >>   
   >> We KNOW otherwise .....   
   >   
   >   
   > Probably true, but seemingly neither psychopathy nor schizophrenia,   
   > where these are the two major bad ones...   
   >   
   >   
   > Then again, how bad ASD is (AKA: autism) likely depends on who you ask.   
   >   
   >   
   > After seeing what Grok had to say about a lot of this, got back roughly:   
   >    Likely ASD with some ADHD like features;   
   >    VSS (Visual Snow Syndrome);   
   >    Mild dissociation.   
   >   
   > Also descriptions:   
   >    Personas 1 and 3 likely exist in the left hemisphere,   
   >      Persona 1 is likely mainly in the frontal lobe;   
   >        Strongly associated with frontal lobe functions;   
   >      Persona 3 is likely mainly in the parietal lobe;   
   >        Strongly associated with parietal lobe functions.   
   >      Possibly they represent a split between the dorsal and ventral   
   > streams.   
   >    Persona 2 is strongly associated with right hemisphere functions.   
   >   
   > There is likely anomalous behavior in the thalamus, corpus calossum, and   
   > occipital lobe; with some features likely tied to excessive computer use   
   > (apparently using computer so much that visual system starts adapting to   
   > specific patterns within the UI rather than to more "natural" patterns).   
   >   
   > Or, some of it possible side effects of spending a significant part of   
   > ones waking lifespan looking at text editors?...   
   >   
   >   
   > So, seemingly this isn't quite the same as DID / MPD, in that it is more   
   > like brain regions and pathways starting to operate partially   
   > independently of each other and forming their own semi-integrated   
   > experiences partially separate from those of the "greater self".   
   >   
   > Apparently looking into it:   
   >    Seeing noise and other artifacts in visual perception;   
   >    Palinopsia (seeing trails behind things, etc);   
   >    Photosensitivity / photophobia issues;   
   >    Tinnitus;   
   >    etc.   
   > Being all associated with VSS, which seems mostly consistent with my   
   > experience.   
   >   
   > Well, and apparently both the sensory filtering (related to VSS) and   
   > large-scale integration functions are both handled by the thalamus (so   
   > possibly something has gone a little weird there).   
   >   
   > Not like any of this is particularly new.   
   >   
   > ...   
   >   
   >   
   >   
   > Otherwise, got around to getting the vector-math stuff working for RV64G   
   > in BGBCC (and with that, got GLQuake working in BGBCC's RV64 mode). In   
   > the basic RV64G mode, it exists mainly as scalar instructions and   
   > runtime calls. There is the relative crappiness of handling 128-bit   
   > vectors by dumping them to RAM and then reloading elements, doing math,   
   > storing elements back, and reloading the result vector on return (the   
   > GPR/FPR split makes things a pain, and in this case going through RAM   
   > was less of a hassle). Still a lot of the runtime functions are still   
   > missing here though (need to implement every operator over every vector   
   > type, still not done, I just did the ones I needed for TKRA-GL).   
   >   
   >   
   > I am debating whether to split the 64-bit and 128-bit SIMD cases for   
   > BGBCC's SIMD support in RV64 mode. Allowing for a 64-bit only   
   > implementation is potentially cheaper on the implementation, but would   
   > be more hassle to deal with in the compiler (though, in this case,   
   > trying to do a 128-bit op without 128-bit SIMD would just mean splitting   
   > the instruction into two 64-bit ops).   
   >   
   > ...   
   >   
   >   
   I have my own set of mental health issues, many people do. I was told by   
   an army doctor that they worry more about people being too sane than   
   insane. Everybody is at least a little insane.   
      
   Qupls4 has quasi-variable length instructions by counting postfixes as a   
   part of the instruction. They get processed and execute as if they were   
   part of the instruction. Since the constant routing information is in   
   the postfix and not the instruction, it is not possible to disable   
   trailing decoders from the lead. The decoders just treat postfixes as   
   NOPs. And NOPs do not make it through dispatch.   
      
   Working on the renamer today, a characteristic it has is it delays the   
   availability of freed register tags by 15 clock cycles so that register   
   tags are not reused too quickly. There was a pipelining issue where a   
   register tag was used again before the pipeline recognized it as free.   
   It takes a couple of clock cycles due to pipelining. Not using a FIFO   
   based renamer as I could not get it to work in a corner case. The   
   renamer would supply tags used too recently when the FIFO was empty.   
   There are also other issues making a FIFO tricky to use.   
      
   For Qupls4 an allocation bitmap is used, find-first-ones, plus an SRL   
   based delay line for freed tags.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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