78IV datasheet(32/523 Pages) NEC

32 / 523 page

CHAPTER 1 GENERAL

User’s Manual U15556EJ1V0UM

<37> Limiting int expansion of argument/return value

When the argument/return value of a function has the char/unsigned type, object files that do not perform

int expansion are generated. This method can shorten the object code and improve the execution speed.

<38> Memory manipulation function

Memory manipulation functions can be output to an object directly with inline expansion. This function can

shorten the object code and improve the execution speed.

<39> callf two-step branch function

Compared when a function body is allocated in the callf area, the callf/_ _callf attribute can be added to

many more functions. Therefore, this function can shorten the object code if many functions that include call

function are frequently used.

<40>

Automatic callf functionization of function call interface

The _ _callf attribute is added to all functions except for the callt/_ _callt

_ _interrupt/_ _interrupt_brk/_

_rtos_interrupt functions.

<41> Three-byte address reference/generation function

Three-byte address reference/generation can be performed with a short code without using a complex cast

description.

<42> Absolute address allocation specification

The external variable that declared _ _directmap and a static variable in a function can be allocated to any

address, and multiple variables can be allocated in duplicate to the same address.

78IV Datasheet(PDF) 32 Page - NEC