|
12 | 12 | * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group |
13 | 13 | * Portions Copyright (c) 1994, Regents of the University of California |
14 | 14 | * |
15 | | - * $Id: c.h,v 1.127 2002/10/0819:17:58 momjian Exp $ |
| 15 | + * $Id: c.h,v 1.128 2002/10/0823:12:22 momjian Exp $ |
16 | 16 | * |
17 | 17 | *------------------------------------------------------------------------- |
18 | 18 | */ |
@@ -572,10 +572,11 @@ typedef NameData *Name; |
572 | 572 | *Exactly the same as standard library function memset(), but considerably |
573 | 573 | *faster for zeroing small word-aligned structures (such as parsetree nodes). |
574 | 574 | *This has to be a macro because the main point is to avoid function-call |
575 | | - *overhead. |
| 575 | + *overhead. However, we have also found that the loop is faster than |
| 576 | + *native libc memset() on some platforms, even those with assembler |
| 577 | + *memset() functions. More research needs to be done, perhaps with |
| 578 | + *platform-specific MEMSET_LOOP_LIMIT values or tests in configure. |
576 | 579 | * |
577 | | - *We got the MEMSET_LOOP_LIMIT value by testing this against the libc |
578 | | - * memset() on several platforms, some with assembly language versions. |
579 | 580 | *bjm 2002-10-08 |
580 | 581 | */ |
581 | 582 | #defineMemSet(start,val,len) \ |
|