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

big_D Silver badge

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

The point of a CPU ID check is to ensure that you never get into the SIGILL situation in the first place. The executing code looks to see if the instructions are supported and if so, it uses them, otherwise it will have to use a software emulation library, using standard ARM instructions, or exit gracefully.

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