[PATCH] Vectorize conversions directly

Dmitry Plotnikov dplotnikov@ispras.ru
Wed Nov 24 16:09:00 GMT 2010


Hi,

This patch enables vector conversions for ARM NEON architecture.  In its 
current state vectorizer can't handle type conversions in the hottest 
loop of libmp3lame on NEON since its backend doesn't have appropriate 
builtins for type conversion.  For x86_64 and rs6000 architectures that 
also can vectorize conversions the default behavior is retained.  We 
have rewritten condition in vectorizable_conversion() in 
tree-vect-stmts.c for the case of NONE modifier.  Now It first looks in 
convert_optab for suitable operation and then in builtins.  It's hard to 
make such fix in arm backend, because neon builtins are not saved and 
enumerated as it's done for x86_64 and rs6000.  Bootstrapped and 
regtested on x86_64 without any regressions.

Ok for trunk? 4.7?



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