[Bug middle-end/55658] bitfields and __attribute__((packed)) generate horrible code on x86_64

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55658



Richard Biener <rguenth at gcc dot gnu.org> changed:



           What    |Removed                     |Added

----------------------------------------------------------------------------

             Target|                            |!SLOW_UNALIGNED_ACCESS

      Known to fail|                            |3.3.6, 4.1.2, 4.5.3, 4.6.4,

                   |                            |4.7.2, 4.8.0

           Severity|normal                      |enhancement



--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> 2012-12-12 
10:00:33 UTC ---

Confirmed for !SLOW_UNALIGNED_ACCESS targets.  At least at -Os it should use

an unaligned movq and mask out bits not needed.