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1b73eef3b4
Split from D17490. This patch improves support for determining the demanded vector elements through SSE scalar intrinsics: 1 - demanded vector element support for unary and some extra binary scalar intrinsics (RCP/RSQRT/SQRT/FRCZ and ADD/CMP/DIV/ROUND). 2 - addss/addsd get simplified to a fadd call if we aren't interested in the pass through elements 3 - if we don't need the lowest element of a scalar operation then just use the first argument (the pass through elements) directly We can add support for propagating demanded elements through any equivalent packed SSE intrinsics in a future patch (these wouldn't use the pass through patterns). Differential Revision: http://reviews.llvm.org/D19318 llvm-svn: 267357
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