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_lror_ doesn't work properly

Andreas Hutstein

Everytime I try to use the _lror_ it works fine several times... but if there's an overflow the variable is set to 0x00000000

//here's the test programm

void main(void)
{ unsigned long test = 0x80000000; test = _lror_(test,1);
}

//to get it working I created my own lror but it's a lot more bigger than the intrinsic _lror_

unsigned long lror(unsigned long input, unsigned int count)
{

unsigned int itmp1,itmp2; bit bit1,bit2;

while(count-->0) { itmp1 = input; input = input>>16; itmp2 = input; bit1 = itmp1 & 0x1; bit2 = itmp2 & 0x1; itmp1 &= 0xfffe; itmp2 &= 0xfffe; itmp1 |= bit2; itmp2 |= bit1; itmp1 = _iror_(itmp1,1); itmp2 = _iror_(itmp2,1); input = itmp2; input = input<<16; input |= itmp1; } return input;
}

Parents
  • 0 in reply to ImPer Westermark

    You could also make your own routine by creating an assembly file called lol.a66 with something like...

    $SEGMENTED CASE MODV2
  NAME LROR
  NCODE   CGROUP  ?PR?LROR
  ASSUME  DPP3 : SYSTEM
  REGDEF  R0 - R15

  ?PR?LROR  SECTION  CODE WORD 'NCODE'

  LROR  PROC  NEAR
  GLOBAL  LROR

LROR_loop:
  ROR   R8,#1
  ROR   R9,#1
  BMOV  R4.15,R9.15
  BMOV  R9.15,R8.15
  BMOV  R8.15,R4.15
  ADD   R10,#-1
  JMP   cc_NZ,LROR_loop

  MOV   R4,R8   ; return LSB
  MOV   R5,R9   ; return MSB
  RET

  LROR  ENDP
  ?PR?LROR  ENDS

  END

    In your C file call it (but make sure you don't have zero for the count).

    extern long LROR(long value, int count);

void main(void) {

  volatile unsigned long test = 0x80000000ul;

  while(1) {
     test = LROR(test,1);
  };
}

Reply
  • 0 in reply to ImPer Westermark

    You could also make your own routine by creating an assembly file called lol.a66 with something like...

    $SEGMENTED CASE MODV2
  NAME LROR
  NCODE   CGROUP  ?PR?LROR
  ASSUME  DPP3 : SYSTEM
  REGDEF  R0 - R15

  ?PR?LROR  SECTION  CODE WORD 'NCODE'

  LROR  PROC  NEAR
  GLOBAL  LROR

LROR_loop:
  ROR   R8,#1
  ROR   R9,#1
  BMOV  R4.15,R9.15
  BMOV  R9.15,R8.15
  BMOV  R8.15,R4.15
  ADD   R10,#-1
  JMP   cc_NZ,LROR_loop

  MOV   R4,R8   ; return LSB
  MOV   R5,R9   ; return MSB
  RET

  LROR  ENDP
  ?PR?LROR  ENDS

  END

    In your C file call it (but make sure you don't have zero for the count).

    extern long LROR(long value, int count);

void main(void) {

  volatile unsigned long test = 0x80000000ul;

  while(1) {
     test = LROR(test,1);
  };
}

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