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Constraints
for asm
operands
See the following documentation
for specific details on what constraint letters you can use with asm
operands. Constraints can say whether an operand may be in a register,
and which kinds of register; whether the operand can be a memory reference,
and which kinds of address; whether the operand may be an immediate constant,
and which possible values it may have. Constraints can also require two
operands to match.