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Change MemSet to use long instead of int32, for better performance on 

64-bit platforms.

by ITAGAKI Takahiro
This commit is contained in:
Peter Eisentraut 2006-02-16 23:23:50 +00:00
parent 422998d275
commit 15a3c33164
1 changed files with 13 additions and 13 deletions
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26
src/include/c.h
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@ -12,7 +12,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/c.h,v 1.195 2006/02/03 13:53:15 momjian Exp $
* $PostgreSQL: pgsql/src/include/c.h,v 1.196 2006/02/16 23:23:50 petere Exp $
*
*-------------------------------------------------------------------------
*/
@ -603,8 +603,8 @@ typedef NameData *Name;
} while (0)
/* Get a bit mask of the bits set in non-int32 aligned addresses */
#define INT_ALIGN_MASK (sizeof(int32) - 1)
/* Get a bit mask of the bits set in non-long aligned addresses */
#define LONG_ALIGN_MASK (sizeof(long) - 1)
/*
* MemSet
@ -624,8 +624,8 @@ typedef NameData *Name;
int _val = (val); \
Size _len = (len); \
\
if ((((long) _vstart) & INT_ALIGN_MASK) == 0 && \
(_len & INT_ALIGN_MASK) == 0 && \
if ((((long) _vstart) & LONG_ALIGN_MASK) == 0 && \
(_len & LONG_ALIGN_MASK) == 0 && \
_val == 0 && \
_len <= MEMSET_LOOP_LIMIT && \
/* \
@ -634,8 +634,8 @@ typedef NameData *Name;
*/ \
MEMSET_LOOP_LIMIT != 0) \
{ \
int32 *_start = (int32 *) _vstart; \
int32 *_stop = (int32 *) ((char *) _start + _len); \
long *_start = (long *) _vstart; \
long *_stop = (long *) ((char *) _start + _len); \
while (_start < _stop) \
*_start++ = 0; \
} \
@ -652,16 +652,16 @@ typedef NameData *Name;
#define MemSetAligned(start, val, len) \
do \
{ \
int32 *_start = (int32 *) (start); \
long *_start = (long *) (start); \
int _val = (val); \
Size _len = (len); \
\
if ((_len & INT_ALIGN_MASK) == 0 && \
if ((_len & LONG_ALIGN_MASK) == 0 && \
_val == 0 && \
_len <= MEMSET_LOOP_LIMIT && \
MEMSET_LOOP_LIMIT != 0) \
{ \
int32 *_stop = (int32 *) ((char *) _start + _len); \
long *_stop = (long *) ((char *) _start + _len); \
while (_start < _stop) \
*_start++ = 0; \
} \
@ -679,7 +679,7 @@ typedef NameData *Name;
* this approach.
*/
#define MemSetTest(val, len) \
( ((len) & INT_ALIGN_MASK) == 0 && \
( ((len) & LONG_ALIGN_MASK) == 0 && \
(len) <= MEMSET_LOOP_LIMIT && \
MEMSET_LOOP_LIMIT != 0 && \
(val) == 0 )
@ -687,8 +687,8 @@ typedef NameData *Name;
#define MemSetLoop(start, val, len) \
do \
{ \
int32 * _start = (int32 *) (start); \
int32 * _stop = (int32 *) ((char *) _start + (Size) (len)); \
long * _start = (long *) (start); \
long * _stop = (long *) ((char *) _start + (Size) (len)); \
\
while (_start < _stop) \
*_start++ = 0; \