>>957 以前にも書いたが、、、 C3のデータシートより引用。 >FP UNIT 2.2.8 〜中略〜 >Certain little-used and complex floating point instructions (sin, tan, etc.) >,however, are implemented in microcode >and are represented by a long stream of instructions coming from the ROM. >These instructions “tie up” the integer instruction pipeline >such that integer execution cannot proceed until they complete.