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Instructs the assembler to report when it outputs an encoding that was not directly requested in the source code.

This can happen when the assembler:

  • Uses a pseudo-instruction that is not available in other assemblers, for example MOV32.

  • Outputs an encoding that does not directly match the instruction mnemonic, for example if the assembler outputs the MVN encoding when assembling the MOV instruction.

  • Inserts additional instructions where necessary for instruction syntax semantics, for example the assembler can insert a missing IT instruction before a conditional Thumb instruction.