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Overview
| Comment: | Only use __builtin_bswap16() with GCC 4.8 and later. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | bswap-functions |
| Files: | files | file ages | folders |
| SHA1: |
ce8177e3e64d2ac4cd5d9e7757cdd5fc |
| User & Date: | drh 2015-06-30 14:01:20 |
Context
|
2015-06-30
| ||
| 15:10 | Make use of built-in bswap32() and bswap16() functions in GCC/Clang for a significant performance improvement there. check-in: 8bfcda3d user: drh tags: trunk | |
| 14:01 | Only use __builtin_bswap16() with GCC 4.8 and later. Closed-Leaf check-in: ce8177e3 user: drh tags: bswap-functions | |
| 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: 79ff36b7 user: drh tags: bswap-functions | |
Changes
Changes to src/btreeInt.h.
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/*
** get2byteAligned(), unlike get2byte(), requires that its argument point to a
** two-byte aligned address. get2bytea() is only used for accessing the
** cell addresses in a btree header.
*/
#if SQLITE_BYTEORDER==4321
# define get2byteAligned(x) (*(u16*)(x))
#elif SQLITE_BYTEORDER==1234 && defined(__GNUC__)
# define get2byteAligned(x) __builtin_bswap16(*(u16*)(x))
#else
# define get2byteAligned(x) ((x)[0]<<8 | (x)[1])
#endif
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| |
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/*
** get2byteAligned(), unlike get2byte(), requires that its argument point to a
** two-byte aligned address. get2bytea() is only used for accessing the
** cell addresses in a btree header.
*/
#if SQLITE_BYTEORDER==4321
# define get2byteAligned(x) (*(u16*)(x))
#elif SQLITE_BYTEORDER==1234 && GCC_VERSION>=4008000
# define get2byteAligned(x) __builtin_bswap16(*(u16*)(x))
#else
# define get2byteAligned(x) ((x)[0]<<8 | (x)[1])
#endif
|
Changes to src/sqliteInt.h.
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#ifndef SQLITE_DISABLE_LFS # define _LARGE_FILE 1 # ifndef _FILE_OFFSET_BITS # define _FILE_OFFSET_BITS 64 # endif # define _LARGEFILE_SOURCE 1 #endif /* Needed for various definitions... */ #if defined(__GNUC__) && !defined(_GNU_SOURCE) # define _GNU_SOURCE #endif #if defined(__OpenBSD__) && !defined(_BSD_SOURCE) |
> > > > > > > |
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#ifndef SQLITE_DISABLE_LFS # define _LARGE_FILE 1 # ifndef _FILE_OFFSET_BITS # define _FILE_OFFSET_BITS 64 # endif # define _LARGEFILE_SOURCE 1 #endif /* What version of GCC is being used. 0 means GCC is not being used */ #ifdef __GNUC__ # define GCC_VERSION (__GNUC__*1000000+__GNUC_MINOR__*1000+__GNUC_PATCHLEVEL__) #else # define GCC_VERSION 0 #endif /* Needed for various definitions... */ #if defined(__GNUC__) && !defined(_GNU_SOURCE) # define _GNU_SOURCE #endif #if defined(__OpenBSD__) && !defined(_BSD_SOURCE) |