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On aarch64 there's also a guaranted invalid instruction, called UDF, and which even supports an optional 16-bit immediate operand: https://developer.arm.com/documentation/ddi0596/2021-12/Base-Instructions/UDF--Permanently-Undefined-?lang=en It's conveniently encoded as 4 zeroes (when the operand is zero). It's unclear when support for it was added into GAS, if at all; even a not-so-old 2.27 doesn't know about it. Let's byte-encode it. Tested on an A72 and works as expected. |
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