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With this patch, for this one exact case, we'll generate: blendps %xmm0, %xmm1, $1 instead of: insertps %xmm0, %xmm1, $0 If there's a memory operand available for load folding and we're optimizing for size, we'll still generate the insertps. The detailed performance data motivation for this may be found in D7866; in summary, blendps has 2-3x throughput vs. insertps on widely used chips. Differential Revision: http://reviews.llvm.org/D8332 llvm-svn: 232850
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