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#### 9.37.3 Assembler Directives

The RX version of `as` has the following specific assembler directives:

`.3byte`

  Inserts a 3-byte value into the output file at the current location.

`.fetchalign`

  If the next opcode following this directive spans a fetch line boundary (8 byte boundary), the opcode is aligned to that boundary. If the next opcode does not span a fetch line, this directive has no effect. Note that one or more labels may be between this directive and the opcode; those labels are aligned as well. Any inserted bytes due to alignment will form a NOP opcode.