Some toolchains may not understand these instructions.
Sponsored by: Arm Ltd
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Buildable 76054 Build 72937: arc lint + arc unit
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It's not quite true that binutils doesn't "understand the instructions", it's more that different toolchains use different ways to enable access to optional instructions. According to the bug I posted earlier, older versions of LLVM matched binutils in that they required -march= for this particular case before the .arch_extension was added. I'm not a huge fan of hand-assembling vs trusting the assembler to do that job, but it does work, and the pattern does seem to match up quite well with how opcodes are described in the ARM ARM at least.
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Maybe just tweak the commit log to say that .arch_extension cannot be used to selectively enable these instructions in all toolchains?