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Subject: Macros versus Inline

Author: Gerd Isenberg

Date: 12:53:35 09/26/03

Hi,

i played a bit with macros versus inline functions -
abs, max and min again.

I got best results with:

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

__forceinline int _abs(int a)        {return a - ifLessZero(a+a);}
__forceinline int _max(int a, int b) {return a - ifLessZero(a-b);}
__forceinline int _min(int a, int b) {return a + ifLessZero(b-a);}


Using inline functions for minusMask and ifLessZero was slighly worse.
But same for using macros for the fuctions too:

#define _abs(a)   ((a) - ifLessZero((a)+(a)))
#define _max(a,b) ((a) - ifLessZero((a)-(b)))
#define _min(a,b) ((a) + ifLessZero((b)-(a)))

hmm, thought macros are _always_ faster than inlines.
Seems to be a bit more than noise in my program.
Does anybody confirm that?

Thanks,
Gerd

• Re: Macros versus Inline Robert Hyatt 11:15:11 09/29/03
• Re: Macros versus Inline Omid David Tabibi 05:11:24 09/27/03
  • Re: Macros versus Inline Russell Reagan 06:54:54 09/27/03
    • Re: Macros versus Inline Omid David Tabibi 08:04:53 09/27/03
      • Re: Macros versus Inline Robert Hyatt 11:16:32 09/29/03
• Re: Macros versus Inline Rick Bischoff 01:46:32 09/27/03
• Re: Macros versus Inline - correction Gerd Isenberg 13:36:14 09/26/03
  • 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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