------- Comment #3 from rguenth at gcc dot gnu dot org 2008-06-27 09:23 -------
This is just out-of-SSA not coalescing "properly" because of
val_16 = val_3 + 8;
D.2623_17 = val_3->ptr_off;
which has overlapping life-ranges for val_3 and val_16. Earlier
compilers either didn't eliminate o in favor of val or were able
to fix this during rtl optimization.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
GCC target triplet|i?86-*-* |i?86-*-*, x86_64-*-*
Keywords| |missed-optimization
Known to work| |4.2.4
Last reconfirmed|0000-00-00 00:00:00 |2008-06-27 09:23:50
date| |
Summary|[4.4 regression] Unnecessary|[4.3/4.4 regression]
|moves generated on loop |Unnecessary moves generated
|boundaries |on loop boundaries
Target Milestone|--- |4.3.2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36646
