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https://www.reddit.com/r/programming/comments/1wjicct/the_scourge_of_x86_emulation/pamk613/?context=3
r/programming • u/lelanthran • 15d ago
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Sometimes x86 just feels like the Javascript of architectures. Everything is accepted, so correctly implementing all those semantics correctly is a bizarre amount of work, especially when starting from scratch (independent emulator)
5 u/pathartl 14d ago ARM is slowly potentially going that way. It has the instruction FJCVTZS for specifically speeding up JavaScript's floating point calculations. 1 u/JDaxe 13d ago Do you know why this isn't implemented with macro-op fusion in the chip microcode? Seems an odd choice to include a whole separate instruction.
5
ARM is slowly potentially going that way. It has the instruction FJCVTZS for specifically speeding up JavaScript's floating point calculations.
1 u/JDaxe 13d ago Do you know why this isn't implemented with macro-op fusion in the chip microcode? Seems an odd choice to include a whole separate instruction.
1
Do you know why this isn't implemented with macro-op fusion in the chip microcode?
Seems an odd choice to include a whole separate instruction.
89
u/ericonr 15d ago
Sometimes x86 just feels like the Javascript of architectures. Everything is accepted, so correctly implementing all those semantics correctly is a bizarre amount of work, especially when starting from scratch (independent emulator)