M3T-NC30WA V.4.00 Release 1 through V.5.10 Release 1

for the M16C/60, M16C/30, M16C/20, and M16C/10 series MCUs

This problem occurs if the following five conditions are satisfied:

(1)	Any one or more of these optimizing options, -O, -O1, -O2, -O3, -O4, -O5, -OR, and -OS, is selected.
(2)	A multiplication of a scalar-type auto variable, A, by an immediate value is performed, and its result is stored in another variable, B.
(3)	A register is allocated to variable A and memory to variable B.
(4)	Either or both of variable A and the immediate value in (2) are cast to the type of variable B.
(5)	The types of variables A and B are as follows: Variable A: unsigned int, signed int, unsigned short, or signed short Variable B: unsigned long or signed long

--------------------------------------------------------
   void func(void)
   {
           long    l;
           int             i;
                   :
           l = (long)i * 100;      /* Conditions (2) and (4) */
           l += (long)i;           /* NOTE */
                   :
   }
--------------------------------------------------------

This problem can be circumvented by performing the following steps:

(1)	Define a temporary auto variable and assign the immediate value in Condition (2) to it.
(2)	Place a dummy asm function immediately after the assignment expression in (1) above.
(3)	Use the temporary auto variable defined in (1) in place of the immediate value in Condition (2).

Example:
--------------------------------------------------------
   void func(void)
   {
        int tmp = 100;   /* A tmp auto variable defined and 
                           an immediate value assigned to it */
        asm();              /* A dummy asm function placed */
                :
        l = (long)i * tmp;  /* Use tmp in place of 100 */
                :
   }
--------------------------------------------------------