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Overview
| Comment: | Make use of htonl() and __builtin_bswap32() for faster implementations of sqlite3Get4byte() and sqlite3Put4byte(). |
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| Timelines: | family | ancestors | descendants | both | bswap-functions |
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| SHA1: |
bc27ebd7f73e9fc8e00da6ec82632e43 |
| User & Date: | drh 2015-06-30 12:47:09.735 |
Context
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2015-06-30
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| 13:28 | Remove the use of htonl() in the previous check-in due to linkage issues. Add the get2byteAligned() macro and use it for access to the cell offsets on btree pages for about a 1% performance gain. (check-in: 79ff36b717 user: drh tags: bswap-functions) | |
| 12:47 | Make use of htonl() and __builtin_bswap32() for faster implementations of sqlite3Get4byte() and sqlite3Put4byte(). (check-in: bc27ebd7f7 user: drh tags: bswap-functions) | |
| 11:07 | Change an unreachable branch into an assert() in sqlite3PagerAcquire() and optimize sqlite3PcacheOpenSavepoint() by factoring out rarely used code into a subroutine. (check-in: b406b20ecd user: drh tags: trunk) | |
Changes
Changes to src/util.c.
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}
/*
** Read or write a four-byte big-endian integer value.
*/
u32 sqlite3Get4byte(const u8 *p){
testcase( p[0]&0x80 );
return ((unsigned)p[0]<<24) | (p[1]<<16) | (p[2]<<8) | p[3];
}
void sqlite3Put4byte(unsigned char *p, u32 v){
p[0] = (u8)(v>>24);
p[1] = (u8)(v>>16);
p[2] = (u8)(v>>8);
p[3] = (u8)v;
}
/*
** Translate a single byte of Hex into an integer.
** This routine only works if h really is a valid hexadecimal
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}
/*
** Read or write a four-byte big-endian integer value.
*/
u32 sqlite3Get4byte(const u8 *p){
#if SQLITE_BYTEORDER==4321
u32 x;
memcpy(&x,p,4);
return x;
#elif defined(_MSC_VER)
u32 x;
memcpy(&x,p,4);
return htonl(x);
#elif SQLITE_BYTEORDER==1234 && defined(__GNUC__)
u32 x;
memcpy(&x,p,4);
return __builtin_bswap32(x);
#else
testcase( p[0]&0x80 );
return ((unsigned)p[0]<<24) | (p[1]<<16) | (p[2]<<8) | p[3];
#endif
}
void sqlite3Put4byte(unsigned char *p, u32 v){
#if SQLITE_BYTEORDER==4321
memcpy(p,&v,4);
#elif defined(_MSC_VER)
u32 x = htonl(v);
memcpy(&x,p,4);
#elif SQLITE_BYTEORDER==1234 && defined(__GNUC__)
u32 x = __builtin_bswap32(v);
memcpy(p,&x,4);
#else
p[0] = (u8)(v>>24);
p[1] = (u8)(v>>16);
p[2] = (u8)(v>>8);
p[3] = (u8)v;
#endif
}
/*
** Translate a single byte of Hex into an integer.
** This routine only works if h really is a valid hexadecimal
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