CC78K4 datasheet(320/523 Pages) NEC

320 / 523 page

CHAPTER 11 EXTENDED FUNCTIONS

User’s Manual U15556EJ1V0UM

320

norec Function

norec

Table 11-18. Registers Used for norec Function Arguments: Receiving Side (Without -ZO)

Data Type

First Argument

Second Argument

Third Argument or Later

char (with 4-byte arguments)

Note 1

char (without 4-byte arguments)

Note 1

R10

R11

R6, R7, R8, R9, saddr2

Note 2

R10, R11, R8, R9, saddr2

Note 2

int, short, enum

(without 4-byte arguments)

Note 1

(with 4-byte arguments)

Note 1

RP3

VP, saddr2

Note 2

VP, saddr2

Note 2

long/float/double/long double

VP (higher16 bits)

RP3 (lower 16 bits)

saddr2

Note 2

saddr2

Note 2

Small model pointer

Medium model data pointer

RP3, saddr2

Note 2

Large model pointer

VVP

saddr2

Note 2

saddr2

Note 2

Notes 1

4-byte arguments are arguments of long, float, double and long double type

When the -QR option is specified, these arguments can be passed via _@NRARGX (saddr2). The

medium model’s function pointer (3 bytes) cannot be used as an argument assigned to the register.

Cautions 1.

The medium model function pointers cannot be used as arguments to be allocated to

registers.

The order of allocating registers of this function is the same as that of an ordinary function

with the -QF option specified.

EFFECT

•

The object code can be shortened and program execution speed can be improved.

USAGE

Declare a function with the norec attribute in the function declaration as follows.

norec

type-name function-name

•

_ _ leaf can also be described instead of norec.

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