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Subject: Re: Macros versus Inline - correction

Author: Gerd Isenberg

Date: 13:36:14 09/26/03

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An int-cast forces signed shift in any case:

>#define minusMask(a)  ((a)>>(sizeof(int)*8-1))
                           ^^

#define minusMask(a)  ((int)(a)>>(sizeof(int)*8-1))

>#define ifLessZero(a) ((a) & minusMask(a))


for abs, to avoid overflow to sign bit - it is better to write:

>__forceinline int _abs(int a)        {return a - ifLessZero(a+a);}
                                                            ^^^
__forceinline int _abs(int a)        {return a - 2*ifLessZero(a);}

• Re: Macros versus Inline - correction Dieter Buerssner 15:38:46 09/26/03
  • Re: Macros versus Inline - correction Gerd Isenberg 00:18:36 09/27/03

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