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3 Commits

Author SHA1 Message Date
Michael Liao 1be96bb5ce Enable lowering ZERO_EXTEND/ANY_EXTEND to PMOVZX from SSE4.1 
llvm-svn: 166486
 2012-10-23 17:34:00 +00:00
Nadav Rotem b7bb72e4f3 Remove the "-promote-elements" flag. This flag is now enabled by default. 
llvm-svn: 157925
 2012-06-04 11:27:21 +00:00
Nadav Rotem 7ae11279e9 When promoting integer vectors we often create ext-loads. This patch adds a 
dag-combine optimization to implement the ext-load efficiently (using shuffles).

For example the type <4 x i8> is stored in memory as i32, but it needs to
find its way into a <4 x i32> register. Previously we scalarized the memory
access, now we use shuffles.

llvm-svn: 139995
 2011-09-18 10:39:32 +00:00