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Most floating-point instructions use a data type specifier to define the size and type of data that the instruction operates on.
Data type specifiers in floating-point instructions consist of a letter indicating the type of data, usually followed by a number indicating the width. They are separated from the instruction mnemonic by a point.
The following data types are available in floating-point instructions:
The datatype of the second (or only) operand is specified in the instruction.
Most instructions have a restricted range of permitted data types. See the instruction descriptions for details. However, the data type description is flexible: