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Simon Pilgrim
0ee70a1554
[X86][SSE] Avoid scalarization of v2i64 vector shifts
Currently v2i64 vectors shifts (non-equal shift amounts) are scalarized, costing 4 x extract, 2 x x86-shifts and 2 x insert instructions - and it gets even more awkward on 32-bit targets. This patch separately shifts the vector by both shift amounts and then shuffles the partial results back together, costing 2 x shuffles and 2 x sse-shifts instructions (+ 2 movs on pre-AVX hardware). Note - this patch only improves the SHL / LSHR logical shifts as only these are supported in SSE hardware. Differential Revision: http://reviews.llvm.org/D8416 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232660 91177308-0d34-0410-b5e6-96231b3b80d8
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