[Bug target/61296] Excessive alignment in ix86_data_alignment

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61296

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
Comments for DATA_ALIGNMENT

   One use of this macro is to increase alignment of medium-size
   data to make it all fit in fewer cache lines.  Another is to
   cause character arrays to be word-aligned so that `strcpy' calls
   that copy constants to character arrays can be done inline.

was added by

https://gcc.gnu.org/git/?p=gcc.git;a=patch;h=ed45e834f305d1f2709bf200a13d5beebc2fcfee

to improve x86 FP performance, which might be partially copied from
CONSTANT_ALIGNMENT:

https://gcc.gnu.org/git/?p=gcc.git;a=patch;h=f7d6703c5d83fc9fb06246d6eb49e9b61098045c