Odd error with the "X" inline assembly constraint

[LIU Hao]

在 2024/1/6 2:46, Segher Boessenkool 写道:
> The C constraint means "Any operand whatsoever is allowed."  Here you
> are saying to use it both as input and as output, and GCC does not know
> how to reload wherever it chose to put it.

Would you mind elaborating a bit more? On x86 and x86-64 it's almost always the case that an 
expression can be used as either a source or a destination.


-- 
Best regards,
LIU Hao

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