-Floating-Point Loads, Stores, and Moves

B.1 Instruction Formats

Floating-Point Loads, Stores, and Moves

All movement of data between the floating-point coprocessor and memory is accomplished by coprocessor load and store operations, which reference the floating-point coprocessor General Purpose registers. These operations are unformatted; no format conversions are performed and, therefore, no floating-point exceptions can occur due to these operations.

Data may also be directly moved between the floating-point coprocessor and the processor by move to coprocessor and move from coprocessor instructions. Like the floating-point load and store operations, move to/from operations perform no format conversions and never cause floating-point exceptions.

An additional pair of coprocessor registers are available, called Floating-Point Control registers for which the only data movement operations supported are moves to and from processor General Purpose registers.

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