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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.

- Simple Constraints
- Multiple Alternative Constraints
- Constraint Modifier Characters
- Constraints for Particular Machines