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> However unlike the ARM, MIPS and x86 designers, RISC-V designers knew about instruction compression and macro-ops fusion when they began designing their ISA.
by klelatti 6y ago
> However unlike the ARM, MIPS and x86 designers, RISC-V designers knew about instruction compression and macro-ops fusion when they began designing their ISA.
Since ARM64 was announced in 2011 this is plainly false for 64 bit ARM.
(And there is similar confusion between 32 and 64 bit ARM throughout the article).
- CalChris 6y agoInstruction compression dates at least to MIPS16, 1996 [1]. Macro-op fusion dates at least to the Pentium M, to 2003 [2]. These are old ideas. [1] https://en.wikipedia.org/wiki/MIPS_architecture https://en.wikipedia.org/wiki/MIPS_architecture [2] https://www.agner.org/optimize/microarchitecture.pdf https://www.agner.org/optimize/microarchitecture.pdf
- klelatti 6y agoIndeed and ARM7TDMI with Thumb was released in 1994 so clearly Arm had forgotten about it by 2011!