[PATCH,rs6000] Add option to avoid generation of indexed load/store instructions
Sun Jan 25 17:41:00 GMT 2009
The following patch adds a new option, -mavoid-xform, to avoid generation
of indexed load/store instructions when possible. Enabling this option on
Power6 has shown some significant improvement on certain benchmarks (lucas,
stream, PTRANS), while at the same time only introducing some minor
improvements/degradations on the other spec benchmarks.
Bootstrapped and regression tested on powerpc64-linux with no new errors
when the option is not enabled. With the option enabled there is one new
failure, gcc.dg/tree-ssa/loop-19.c, which would be expected since that test
is looking for indexed load/store patterns.
OK for trunk?
2009-01-25 Pat Haugen <email@example.com>
* config/rs6000/rs6000-protos.h (avoiding_indexed_address_p):
* config/rs6000/rs6000.opt (avoid-xform): New option.
* config/rs6000/rs6000.c (rs6000_override_options): Default
on for Power6, off for everything else.
(avoiding_indexed_address_p): New function.
(rs6000_legitimize_address): Use it.
* config/rs6000/rs6000.md (movXX_updateX): Likewise
(See attached file: avoid_xform.diff)
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 11443 bytes
Desc: not available
More information about the Gcc-patches