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Use "andnot" instruction when vectorising
Issue #528
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Use the "andnot" instruction to reduce the number of different bit masks that are required. Using fewer different bit masks may require fewer registers to hold them, or fewer load instructions to access them, thus potentially improving performance.
Do not scalarize ifpos when SSE 4.1 is not available; instead, use logical operations to create a bit mask.
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This looks fine to me and the testsuites still pass with it applied. I think it can be committed.
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Committed.
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