A CPU Instruction Set Details

DMULT rs, rt

Description:

The contents of general registers rs and rt are multiplied, treating both operands as 2's complement values. No integer overflow exception occurs under any circumstances.

When the operation completes, the low-order word of the double result is loaded into special register LO, and the high-order word of the double result is loaded into special register HI.

If either of the two preceding instructions is MFHI or MFLO, the results of these instructions are undefined. Correct operation requires separating reads of HI or LO from writes by a minimum of two other instructions.

This operation is only defined for the R4000 operating in 64-bit mode. Execution of this instruction in 32-bit mode causes a reserved instruction exception.

Operation:

Exceptions:

Reserved instruction exception (R4000 in 32-bit mode)

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