| 摘要 |
PROBLEM TO BE SOLVED: To quickly execute other graphics instructions by using a special instruction to minimize the addition of hardware to a general-purpose CPU and also to optimize the execution of a certain graphics instruction. SOLUTION: A PDU(prefetch dispatch unit) 46 gives four instructions at most and in parallel to plural pipeline type execution devices along a pipeline bus 14. An integer calculation instruction is sent to one of two IEU(integer execution units), i.e., an integer multiplication/division unit 30 or an integer ALU(arithmetic logic unit) 31. These two units share the access to an integer register file 36 to store the operand and result of the integer calculation. In addition, three floating point arithmetic units, i.e., a floating point division/ square root execution unit 25, a floating point/graphics ALU 26 and a floating point/graphics multiplier 28 arc connected to the bus 14 and share a floating point register file 38. |
