------- Comment #1 from ubizjak at gmail dot com 2010-09-18 19:47 -------
`-malign-double'
`-mno-align-double'
Control whether GCC aligns `double', `long double', and `long
long' variables on a two word boundary or a one word boundary.
Aligning `double' variables on a two word boundary will produce
code that runs somewhat faster on a `Pentium' at the expense of
more memory.
On x86-64, `-malign-double' is enabled by default.
*Warning:* if you use the `-malign-double' switch, structures
containing the above types will be aligned differently than the
published application binary interface specifications for the 386
and will not be binary compatible with structures in code compiled
without that switch.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45724
