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Author SHA1 Message Date
Nadav Rotem
5c5681cf27 The type-legalizer often scalarizes code. One of the common patterns is extract-and-truncate. 
In this patch we optimize this pattern and convert the sequence into extract op of a narrow type.
This allows the BUILD_VECTOR dag optimizations to construct efficient shuffle operations in many cases.

llvm-svn: 149692
 2012-02-03 13:18:25 +00:00
Nadav Rotem
341b30a457 Fix a bug in the integer-promotion of bitcast operations on vector types. 
We must not issue a bitcast operation for integer-promotion of vector types, because the
location of the values in the vector may be different.

llvm-svn: 146150
 2011-12-08 13:10:01 +00:00