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This patch improves the lowering of v4f32 and v4i32 build_vector dag nodes that are known to have at least two non-zero elements. With this patch, a build_vector that performs a blend with zero is converted into a shuffle. This is done to let the shuffle legalizer expand the dag node in a optimal way. For example, if we know that a build_vector performs a blend with zero, we can try to lower it as a movq/blend instead of always selecting an insertps. This patch also improves the logic that lowers a build_vector into a insertps with zero masking. See for example the extra test cases added to test sse41.ll. Differential Revision: http://reviews.llvm.org/D6311 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222375 91177308-0d34-0410-b5e6-96231b3b80d8
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