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Author SHA1 Message Date
Sanjay Patel 3fee49b236 fixed to test features, not CPUs 
llvm-svn: 231524
 2015-03-06 21:50:42 +00:00
Andrea Di Biagio 54b0949af9 [X86] Teach how to combine horizontal binop even in the presence of undefs. 
Before this change, the backend was unable to fold a build_vector dag
node with UNDEF operands into a single horizontal add/sub.

This patch teaches how to combine a build_vector with UNDEF operands into a
horizontal add/sub when possible. The algorithm conservatively avoids to combine
a build_vector with only a single non-UNDEF operand.

Added test haddsub-undef.ll to verify that we correctly fold horizontal binop
even in the presence of UNDEFs.

llvm-svn: 211265
 2014-06-19 10:29:41 +00:00