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Subject: Re: OT: switch Statement Performance Consideration

Author: Robert Hyatt

Date: 20:33:26 09/01/02

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On September 01, 2002 at 20:46:55, Pham Hong Nguyen wrote:

>The following article and discussion may be useful for you!
>
>http://www.codeguru.com/cpp_mfc/switch.html


That is basically wrong.

Compile a simple piece of code with gcc, using -O and you will see
why.

gcc creates a jump table of addresses for each case.  It computes the
entry to load and jumps to that.  No compares and branches.  Someone
doesn't know how compilers do things.  If you have really oddball case
value, it might have to resort to that.  But for the kinds of values
we use in chess, no way...

• Re: OT: switch Statement Performance Consideration Gerd Isenberg 05:51:21 09/02/02
  • Re: OT: switch Statement Performance Consideration Robert Hyatt 10:04:45 09/02/02
    • Re: OT: switch Statement Performance Consideration Gerd Isenberg 11:06:15 09/02/02
      • Re: OT: switch Statement Performance Consideration Robert Hyatt 16:25:06 09/02/02
• Re: OT: switch Statement Performance Consideration Heiner Marxen 05:40:42 09/02/02
• Re: OT: switch Statement Performance Consideration Pham Hong Nguyen 21:55:34 09/01/02
  • Re: OT: switch Statement Performance Consideration Robert Hyatt 10:09:17 09/02/02
    • Re: OT: switch Statement Performance Consideration Jesper Antonsson 14:24:00 09/02/02
      • Re: OT: switch Statement Performance Consideration Robert Hyatt 16:22:29 09/02/02
  • Re: OT: switch Statement Performance Consideration Ricardo Gibert 22:39:11 09/01/02

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