bugGNU Development Chain for 68HC11/68HC12 - Bugs: bug #17442, wrong code optimization

 
 

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bug #17442: wrong code optimization

Submitter:  None
Submitted:  Wed 16 Aug 2006 11:14:54 AM UTC
 
Category:  gcc Severity:  3 - Normal
Item Group:  sw-bug Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open

Wed 16 Aug 2006 11:14:54 AM UTC, original submission:  

Switching from Release 2.1.0 to Release 3.1 I found following problem. I had code like this:

typedef unsigned char uint8;

typedef struct StructDate {uint8 Day; uint8 Month; uint8 Year; uint8 Weekday;} Date;

volatile Date today;

void doSth(volatile Date* ptr)
{
  uint8_to_lcd(ptr->Day);
}

void main()
{
  today.Day = 1;
  today.Month = 1;
  today.Year = 2006;
  today.Weekday = 1;
  doSth(&today);
}

Looking inside the memory I saw, that today.Day is set correctly. But ptr->Day returns a wrong value (always 0x1b). ptr-Month etc. do return the right value, so the problem is only in the first field of the structure.
This error only occurs if optimization is turned on, if no -O is given to the compiler the code works. I only tried -m68hcs12 and -m68hc12 since I do not have a HC11.

Anonymous

 

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