Renesas Renasas Single-Chip Microcomputer SH7086 Manual de usuario descargar pdf (Pagina 294)

Q&A-6

CPU

What is the difference between the DIV instruction and the DIVX instruction?

Either of the DIV instruction and the DIVX instruction is an instruction for signed division, the sign of

the remainder is different.

The sign of the remainder left after the DIV instruction is the same as that of the dividend, on the

contrary, the sign of the remainder of the DIVX instruction is the same as that of the divisor.

In general, the following relation among quotient, divisor, dividend, and remainder holds.

dividend = divisor quotient + remainder

Since the sign of the remainder is different between these instructions, the quotient obtained either

by dividing a positive integer by a negative integer or by dividing a negative integer by a positive

integer using the DIV instruction is different from that obtained using the DIVX instruction.

For example, dividing 10 by –3 using the DIV instruction yields –3 and leaves +1, while doing the

same using the DIVX instruction yields –4 and leaves –2.

Dividing –10 by +3 using the DIV instruction yields –3 and leaves –1, while doing the same using the

DIVX instruction yields –4 and leaves +2.

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Renesas Renasas Single-Chip Microcomputer SH7086 Manual de usuario Pagina 294