MODES_TIEABLE in avr is set such that access to subreg is prevented.
This result is significantly sub-optimal code.
Attached patch changes this. No regressions have been found with test suite -
indeed things got better!
Note this is related to PR/19815 documentation error.
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Summary: [AVR] MODES_TIEABLE incorrect
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: andrewhutchinson at cox dot net
CC: gcc-bugs at gcc dot gnu dot org
GCC target triplet: avr
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19924
