Reply to post: Re: "I did not know that ARM actually prohibited adding instructions"

Talk about a calculated RISC: If you think you can do a better job than Arm at designing CPUs, now's your chance

JulieM Silver badge

Re: "I did not know that ARM actually prohibited adding instructions"

Isn't every instruction conditional on ARM? So you could set a flag if the hardware supports the fancy instruction, have the real instruction predicated on this flag so it will be ignored if hardware support is absent, and follow this with a BL predicated on the flag not set to do the software emulated version which will be ignored if hardware support is present.

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