Item 10 from the old PROBLEMS file (no test case available):
----------------------------------------
movl a3@,a0
movl a3@(16),a1
clrb a0@(a1:l)
is generated and may be worse than
movl a3@,a0
addl a3@(16),a0
clrb a0@
If ordering of operands is improved, many more such cases will be
generated from typical array accesses.
----------------------------------------
--
Summary: [m68k] Inefficient code for array accesses (from old
PROBLEMS)
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P2
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: steven at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19201