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For 8-bit the subtrahend is small enough to fit into uint32_t. For 10/12-bit apply: 63a37d16f Prevent negative variance previously: 47b9a0912 Resolve -Wshorten-64-to-32 in highbd variance. c0241664a Resolve -Wshorten-64-to-32 in variance. Change-Id: I181c85f0b9a03da37c2e8b89482d48aa3dbc0aee