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Overview
| Comment: | Additional comments ono the SQLITE_MIXED_ENDIAN_64BIT_FLOAT issue. (CVS 4029) |
|---|---|
| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
dd48a31e671de09f59661b2ba1a20e7b |
| User & Date: | drh 2007-05-23 07:20:09.000 |
Context
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2007-05-23
| ||
| 09:52 | Fix a database corrupting bug in the optimistic overflow chain. Exposed by running bigrow.test with auto-vacuum enabled. (CVS 4030) (check-in: 10ee2d50cb user: danielk1977 tags: trunk) | |
| 07:20 | Additional comments ono the SQLITE_MIXED_ENDIAN_64BIT_FLOAT issue. (CVS 4029) (check-in: dd48a31e67 user: drh tags: trunk) | |
| 06:31 | Make sure zeroblob() works with the concatenation operator. Ticket #2379. (CVS 4028) (check-in: 6e19ef7582 user: drh tags: trunk) | |
Changes
Changes to src/vdbeaux.c.
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static const u8 aSize[] = { 0, 1, 2, 3, 4, 6, 8, 8, 0, 0, 0, 0 };
return aSize[serial_type];
}
}
/*
** If we are on an architecture with mixed-endian floating
| | | > > > > > > > > > > > > > > | 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 |
static const u8 aSize[] = { 0, 1, 2, 3, 4, 6, 8, 8, 0, 0, 0, 0 };
return aSize[serial_type];
}
}
/*
** If we are on an architecture with mixed-endian floating
** points (ex: ARM7) then swap the lower 4 bytes with the
** upper 4 bytes. Return the result.
**
** For most architectures, this is a no-op.
**
** (later): It is reported to me that the mixed-endian problem
** on ARM7 is an issue with GCC, not with the ARM7 chip. It seems
** that early versions of GCC stored the two words of a 64-bit
** float in the wrong order. And that error has been propagated
** ever since. The blame is not necessarily with GCC, though.
** GCC might have just copying the problem from a prior compiler.
** I am also told that newer versions of GCC that follow a different
** ABI get the byte order right.
**
** Developers using SQLite on an ARM7 should compile and run their
** application using -DSQLITE_DEBUG=1 at least once. With DEBUG
** enabled, some asserts below will ensure that the byte order of
** floating point values is correct.
*/
#ifdef SQLITE_MIXED_ENDIAN_64BIT_FLOAT
static double floatSwap(double in){
union {
double r;
u32 i[2];
} u;
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