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Thirtythirst4sissies
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tech/science swag.
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I can never find the source of this but supposedly modern x86 CPUs have a "RISC-y" real architecture that traditional x86_64 is translated to.
In that sense a lot of discussion around CISC vs. RISC in the x86 vs. ARM war is moot.
I believe ARM just has had more R&D in low power situations which turned out to scale way better than people expected.
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the extra translation is costly in performance. Also all of the extra cruft from decades ago (real mode, unreal mode, trusted computing coprocessor, etc.) is a major vector for malware in the same way that a heckin' chonker's fat folds are vector for bacteria
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Is it, though?
High-level instructions have the upside of microarch-specific translation. If it made sense to compile more directly to microarch microops (or even cache the translation at scale), I suspect there would have been at least one company attempting it. GPUs got big into shader caches, so it's not like low-level, device-specific generated data is off limits for optimization.
Itanium's biggest flaw was how explicit it was; pushing microop sequencing and synchronization all the way back to the compiler proved inflexible.
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Even if that's true, you can just use an intermediate representation that does the same thing you're describing but more flexibly. They just didn't have LLVM back in like 2001. The difference would only be that the translation from the IR is done transparently on a compiler level rather than a hardware and ucode level.
P.S. Edit:
This is kind of absurd and fricked up because the GPU manufacturer can alter your shader without you knowing. As a graphics programmer I hate this.
You know what else GPUs did? GPGPU stuff. It's like you can compile to SPIRV, AMDGPU, etc. now with LLVM. These kinds of optimizations should be done at the compiler level these days. Like these optimizations could just be linked assembly code in a library or something.
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Modern x64 instructions are basically that. There's a big difference between a legacy x86 instruction that's inefficiently implemented in microcode (to preserve compatibility) versus a modern (maybe even vectorized) CISC instruction that's high-level but efficiently implementable.
The x64 instruction set has evolved considerably over time.
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that's nice but have you ever had even a crumb of kitty in your life?
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Nope
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Stay on the gay and narrow, brother
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He actually sucks gock and fricks bussy, for your information.
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https://chipsandcheese.com/2024/03/27/why-x86-doesnt-need-to-die/
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x86 needs to die because every single x86 processor has backdoors the government can get into. ARM may not be much better but RISC V gives me hope
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RISC management engine would be much catchier than IME
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https://en.wikipedia.org/wiki/Micro-operation
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What you're looking for are called "micro operations." Basically every modern x86 CPU turns the legacy x86 ops into a series of smaller pieces, so it's basically turning one CISC instruction into a bunch of RISC ones.
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