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Again improve MemSet comments.

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This commit is contained in:
Bruce Momjian 2002-10-08 23:12:22 +00:00
parent 59da96b8ce
commit baaf8d7186
1 changed files with 5 additions and 4 deletions
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9
src/include/c.h
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@ -12,7 +12,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California * Portions Copyright (c) 1994, Regents of the University of California
* *
* $Id: c.h,v 1.127 2002/10/08 19:17:58 momjian Exp $ * $Id: c.h,v 1.128 2002/10/08 23:12:22 momjian Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -572,10 +572,11 @@ typedef NameData *Name;
* Exactly the same as standard library function memset(), but considerably * Exactly the same as standard library function memset(), but considerably
* faster for zeroing small word-aligned structures (such as parsetree nodes). * faster for zeroing small word-aligned structures (such as parsetree nodes).
* This has to be a macro because the main point is to avoid function-call * This has to be a macro because the main point is to avoid function-call
* overhead. * overhead. However, we have also found that the loop is faster than
* native libc memset() on some platforms, even those with assembler
* memset() functions. More research needs to be done, perhaps with
* platform-specific MEMSET_LOOP_LIMIT values or tests in configure.
* *
* We got the MEMSET_LOOP_LIMIT value by testing this against the libc
* memset() on several platforms, some with assembly language versions.
* bjm 2002-10-08 * bjm 2002-10-08
*/ */
#define MemSet(start, val, len) \ #define MemSet(start, val, len) \