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mysterymath avatar mysterymath commented on June 20, 2024 1

"Clobber descriptions may not in any way overlap with an input or output operand."
https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Clobbers-and-Scratch-Registers

Accordingly, this is undefined behavior. I think I'd like the compiler to emit a warning for this if that's possible; it appears that there are similar warnings in Clang for other platforms, so it may be a matter of hooking it up. See #385 for this.

I'm bumping #385 up to a P0 due to the number of times this has come up; a bad inline assemble experience may be a serious risk for the project. I'll take a look at this in the near future and see if there's anything we can do about the user experience; but the rules themselves are out of our hands.

from llvm-mos.

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