Renesas TM V.3.20A Especificaciones descargar pdf (Pagina 262)

100

101

Renesas Technology, Tools FAQs

Last Updated: July 5, 2000

Document Number: 01051106_e

CC32R V.2.00 introduces [Memory Models]. What are the differences between the compiled results of each model?

The generated assembler code will differ according to the operation, as described below.

Data Access (variable)

When accessing data (variable), the code will differ depending on the instruction set used: 24-bit address (LD24

instruction) or 32-bit address (such as combination of SETH instruction and LD/ST instruction).

Function Call

The code will differ depending on the type of function call used: PC-relative jump (BL instruction) or register-direct

jump (JL instruction).

Function Address Acquisition

The code will differ depending on whether the function address is obtained with 24 bits (LD24 instruction) or 32 bits

(combination of SETH instruction and OR3 instruction).

Below is a list of codes created by each Memory Model according to the selected operation.

Data Access

(variable, constant)

Function Call Function Address Acquisition

Small Model

LD24 R0,#_data

LD R0,@R0

BL $func

LD24 R1,#$func

LD24 R0,#_pfunc

ST R1,@R0

Small Model

with

"-memlarge"

SETH R0,#SHIGH(_data)

LD R0,@(LOW(_data),R0)

BL $func

LD24 R1,#$func

SETH R0,#HIGH(_pfunc)

OR3 R0,R0,#LOW(_pfunc)

ST R1,@R0

Medium Model

SETH R0,#SHIGH(_data)

LD R0,@(LOW(_data),R0)

BL $func

SETH R1,#HIGH($func)

OR3 R1,R1,#LOW($func)

SETH R0,#HIGH(_pfunc)

OR3 R0,R0,#LOW(_pfunc)

ST R1,@R0

Large Model

SETH R1,#SHIGH(_data)

LD R0,@(LOW(_data),R0)

SETH R1,#HIGH($func)

OR3 R1,R1,#LOW($func)

JL R1

SETH R1,#HIGH($func)

OR3 R1,R1,#LOW($func)

SETH R0,#HIGH(_pfunc)

OR3 R0,R0,#LOW(_pfunc)

ST R1,@R0

The following shows the C source code of the sample program foo.c and the assembler objects when compiled by each Memory

Model.

- Sample C-Source Program -

( foo.c )

1 extern int data;

2 extern void func(int);

3 extern void (*pfunc)(int);

5 void foo()

6 {

7 func(data);

8 pfunc = func;

9 }

1 2 ... 257 258 259 260 261 262 263 264 265 266 267 ... 761 762

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Renesas TM V.3.20A Especificaciones Pagina 262

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