gcc.info: Constraints
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Operand Constraints
Each `match_operand' in an instruction pattern can specify a
constraint for the type of operands allowed. 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.
Created Wed Sep 1 16:42:23 2004 on bee with info_to_html version 0.9.6.