[alpha] Unify zero_extend patterns with attribute enabled
Richard Henderson
rth@redhat.com
Fri Mar 25 00:12:00 GMT 2011
The attribute enabled feature can help avoid quite a lot of
duplication in the alpha backend. This begins the process
by tackling the easiest -- zero_extension, conditionalized
on the existance of the BWX instruction set extension.
Tested on alpha{,ev5,ev56,ev67}-linux.
r~
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