trunk/be018342370825fe89c86d51462b461591eff3d7: [caffe2/veclib] Fix (double)0 yielding -0.0 on AVX2 (#196607) (#196607)
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Summary: Make conversion of 64-bit 0 into double be +0.0 instead of -0.0 In this way, AVX2-based i64->f64 conversion will be identical to other ISAs Test Plan: CI Differential Revision: D118971238 Pull Request resolved: #196607 Approved by: https://github.com/Skylion007
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