[sdcc-devel] [ sdcc-Bugs-1027588 ] mul/div in the PIC16 port

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Bugs item #1027588, was opened at 2004-09-14 02:02
Message generated for change (Settings changed) made by vrokas
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Category: pic16 target
>Group: fixed
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: ccsporters (tecodev)
>Assigned to: Vangelis Rokas (vrokas)
Summary: mul/div in the PIC16 port

Initial Comment:
The following code fails:

int main () {
  volatile unsigned int val1, val2, res;
  volatile long f1, f2, prod;

  f1 = 2L;
  f2 = 4L;
  prod = f1 * f2; /* BUG1 */
  prod = 2L * f2;
  prod = f1 * 4L;
  prod = 2L * 4L;

  val1 = 0x30d4;
  val2 = 0x123;
  res = val1 / val2;
  res = val1 / 0x123;
  res = ((unsigned int)0x30d4) / val2;  /* BUG2 */
  res = ((unsigned int)0x30d4) / 0x123;
  
  return res;
}

Compiled using "sdcc -mpic16 -p18f452 --no-crt div.c" 
with SDCC : pic16 2.4.4 #838 (Sep 13 2004) (UNIX)
two bugs occur:
(BUG1) long multiplication cannot be performed natively,
       fix line 700, main.c from "<= 4" to "< 4" works fine
       (calls the library function)
       [comment out BUG2 to compile]

(BUG2) compiling aborts here with an assertion:
Internal error: validateOpType failed in
OP_SYMBOL(IC_LEFT(ic)) @ main.c:700: expected symbol,
got value

Modifying main.c:700f to read
  if((ic->op == '*')
     && (getSize(OP_SYMBOL(IC_LEFT(ic))->type) < 4))
     		return TRUE;
circumvents both errors.

Greetings,
  Raphael Neider

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