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标题: CCSC中怎样才能使汇编后的GOTO变为CALL？ [打印本页]

作者: winnie 时间: 2009-4-25 15:21
标题: CCSC中怎样才能使汇编后的GOTO变为CALL？
CCSC中应怎样才能使在汇编时的GOTO变为CALL，以压缩空间。相关程式如下：CCSC程式：
while(1)
   {
      sub1() ; //1
      sub2() ; //2
      sub3() ; //3
      sub4() ; //4
      sub5() ; //5
      sub2() ; //6
      sub7() ; //7
      //sub8() ; //8
      subprogram8_9_flag =0  ; // 0 is subprogram8
      sub8_9() ;             //8 在汇编时生成GOTO，为何不是CALL
      //sub9() ; //9
      subprogram8_9_flag =1  ; //  1 is subprogram9
      sub8_9() ;             //9 在汇编时生成GOTO，为何不是CALL
      sub3() ; //10
      sub11()  ; //11
      sub5() ; //12
      sub2() ; //13
      //sub7() ; //14
}
汇编后的程式：
....................       subprogram8_9_flag =0  ; // 0 is subprogram8
*
0132:  CLRF 0A
....................       sub8_9() ;             //8 在汇编时生成GOTO，为何不是CALL
....................       //sub9() ; //9
....................       subprogram8_9_flag =1  ; //  1 is subprogram9
*
0150:  MOVLW  01
0151:  MOVWF  0A
....................       sub8_9() ;             //9 在汇编时生成GOTO，为何不是CALL
....................       sub3() ; //10
....................       sub11()  ; //11
....................       sub5() ; //12
....................       sub2() ; //13

作者: winnie 时间: 2009-4-25 15:21
当main(）中只调了一次

sub1(i) ;

sub2(j) ;

时候，生成goto语句。

两次及其以上，

生成call语句。

作者: winnie 时间: 2009-4-25 15:21
#if defined(__PCM__)
#include <16F877.h>
#fuses HS,NOWDT,PROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=1200, xmit=PIN_C6, rcv=PIN_C7)

#elif defined(__PCH__)
#include <18F452.h>
#fuses HS,NOWDT,PROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=1200, xmit=PIN_C6, rcv=PIN_C7)
#endif

void sub1(int8 i)
{
i++;
}

void sub2(int8 j)
{
j++;
}

void main(void)
{
int8 i,j;
i=0;
j=0;

while(1)
   {
      sub1(i) ; file://1
      sub2(j) ; file://2

      sub1(i) ; file://1
      sub2(j) ; file://2

      sub1(i) ; file://1
      sub2(j) ; file://2
}

}

——————————————————————————————

CCS PCH C Compiler, Version 3.187, 16465

            Filename: C:\Documents and Settings\lanyong\My Documents\1.LST

            ROM used: 104 (0%)
                     Largest free fragment is 32664
            RAM used: 7 (0%) at main() level
                     8 (1%) worst case
            Stack: 1 locations

*
0000:  GOTO main
....................  #if defined(__PCM__)
.................... #include <16F877.h>
.................... #fuses HS,NOWDT,PROTECT,NOLVP
.................... #use delay(clock=20000000)
.................... #use rs232(baud=1200, xmit=PIN_C6, rcv=PIN_C7)
....................
.................... #elif defined(__PCH__)
.................... #include <18F452.h>
....................  //////// Standard Header file for the PIC18F452 device ////////////////
.................... #device PIC18F452
.................... #list
....................
.................... #fuses HS,NOWDT,PROTECT,NOLVP
.................... #use delay(clock=20000000)
.................... #use rs232(baud=1200, xmit=PIN_C6, rcv=PIN_C7)
.................... #endif
....................
.................... void sub1(int8 i)
.................... {
0004:  NOP(FFFF)
.................... i++;
0006:  INCF i,F
.................... }
0008:  RETLW  00
000A:  NOP(FFFF)
....................
.................... void sub2(int8 j)
.................... {
000C:  NOP(FFFF)
.................... j++;
000E:  INCF j,F
.................... }
0010:  RETLW  00
0012:  NOP(FFFF)
....................
.................... void main(void)
.................... {
0014:  NOP(FFFF)
0016:  CLRF TBLPTRU
0018:  BCF RCON.7
001A:  CLRF FSR0H
001C:  CLRF FSR0L
001E:  MOVLW  06
0020:  MOVWF  ADCON1
0022:  MOVLW  FF
0024:  MOVWF  SPBRG
0026:  MOVLW  22
0028:  MOVWF  TXSTA
002A:  MOVLW  90
002C:  MOVWF  RCSTA
.................... int8 i,j;
.................... i=0;
002E:  CLRF i
.................... j=0;
0030:  CLRF j
....................
.................... while(1)
....................    {
....................       sub1(i) ; file://1
0032:  MOVFF  i,i
0036:  CALL sub1
....................       sub2(j) ; file://2
003A:  MOVFF  j,j
003E:  CALL sub2
....................
....................       sub1(i) ; file://1
0042:  MOVFF  i,i
0046:  CALL sub1
....................       sub2(j) ; file://2
004A:  MOVFF  j,j
004E:  CALL sub2
....................
....................       sub1(i) ; file://1
0052:  MOVFF  i,i
0056:  CALL sub1
....................       sub2(j) ; file://2
005A:  MOVFF  j,j
005E:  CALL sub2
.................... }
0062:  GOTO 0032
....................
.................... }
....................
0066:  SLEEP

Configuration Fuses:
Word  1: 2200 HS NOOSCSEN
Word  2: 0E0F BROWNOUT WDT128 NOWDT BORV20 NOPUT
Word  3: 0100 CCP2C1
Word  4: 0081 STVREN NODEBUG NOLVP
Word  5: C000 PROTECT NOCPD NOCPB
Word  6: E00F NOWRT NOWRTD NOWRTB NOWRTC
Word  7: 400F NOEBTR NOEBTRB

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