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optimization question

Jim P

I want to perform math compares using constants so that we test that the compare operation performs correctly. The compiler obviously recognizes that the compare operation produces a true result with the constants given so it doesn't generate any code for it. What can I specify to the compiler to tell it to generate code for what it sees and not perform any optimization?
Here is an example piece of the code:

    BOOL BoolResult = FALSE;
    /*---------------------------------------------------
     * integer compare operations
     *---------------------------------------------------*/
    if ( (10000 <  20000) &&
          (20000 <= 30000) &&
          (30000 >  25000) &&
          (25000 >= 20000) &&
          (20000 == 20000) &&
          (20000 != 20001)
       )
    {
            BoolResult = TRUE;
    }

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  • 0

    You could move the comparisons into separate functions and hope that the compiler doesn't inline them:

    BOOL less(int a, int b) { return a < b ? TRUE : FALSE; }
BOOL more(int a, int b) { return a > b ? TRUE : FALSE; }


    And so on. Then use these functions instead of the comparison operators. After testing, you can use macros to 'inline' the functions.

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  • 0

    You could move the comparisons into separate functions and hope that the compiler doesn't inline them:

    BOOL less(int a, int b) { return a < b ? TRUE : FALSE; }
BOOL more(int a, int b) { return a > b ? TRUE : FALSE; }


    And so on. Then use these functions instead of the comparison operators. After testing, you can use macros to 'inline' the functions.

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