[Bug tree-optimization/32901] [4.1/4.2/4.3 regression] bitfield constants with multiple bitfields take up space in .data

[jakub at gcc dot gnu dot org]

------- Comment #7 from jakub at gcc dot gnu dot org  2007-12-04 19:58 -------
The problem is that we really don't have any optimization which would before
expand merge all the sets to adjacent bitfield fields into one (or few)
BITFIELD_REFs.  If we are lucky and the RTL passes merge it together,
initializing small structs containing bitfields this way will be a win, but
it might be an pessimization as well.
BTW, shouldn't TER try to merge several consecutive initializations of fields
of one aggregate into a CONSTRUCTOR again, so that RTL expanders can do better
job on it?  This wouldn't be the only bug which could be helped by that.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32901