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Subject: For compiler gurus about Bit fields

Author: Peter Fendrich

Date: 06:18:09 11/12/04

Will C++ compilers (especially .NET) handle bit fields with decent performance?
It is very tempting to use them in hash tables for instance.
Something like this:

struct Hash
{
   unsigned KeyPart    : 48;   // 32+16
   unsigned Eval       : 16;
   unsigned Flag       :  2;   // FH, FL, Inside
   unsigned FrPiece    :  4;   // Move
   unsigned Fr         :  6;   // Move
   unsigned To         :  6;   // Move
   unsigned Threat     :  1;
   unsigned Depth      : 10;
   unsigned Generation :  3;
} hash;

hash.KeyPart = HashKey;
etc...

/Peter

• Re: For compiler gurus about Bit fields Robert Hyatt 08:13:17 11/13/04
  • Re: For compiler gurus about Bit fields Peter Fendrich 09:30:04 11/13/04
• Re: For compiler gurus about Bit fields Gerd Isenberg 01:17:09 11/13/04
• Re: For compiler gurus about Bit fields Mathieu Pagé 09:52:25 11/12/04
  • Re: For compiler gurus about Bit fields Peter Fendrich 12:32:22 11/12/04

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