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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