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Subject: [Bug rtl-optimization/53176] [4.8 Regression] gcc.dg/lower-subreg-1.c FAILs
Date: Sun, 06 May 2012 23:30:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53176

--- Comment #21 from Hans-Peter Nilsson <hp at gcc dot gnu.org> 2012-05-06 23:25:40 UTC ---
All this should be taken care of by the default rtx costs; I don't think any
target patches should be needed for these targets at least not for this case. 
The default should be N*natural_set_cost, where natural_set_cost is the cost of
setting a register (possibly the default) and N is the number of UNITS_PER_WORD
for the rtx.
And, the target rtx cost hook should only need to handle rtxes that are valid
for the target; no phony insns in larger modes for which there is no named
pattern (not documented as such but inferring from only valid addresses needing
to be handled by TARGET_ADDRESS_COST).