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Unverified Commit 0bd9255f authored by Simon Pilgrim's avatar Simon Pilgrim Committed by GitHub
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[X86] Improve KnownBits for X86ISD::PSADBW nodes (#83830) 

Don't just return the known zero upperbits, compute the absdiff Knownbits and perform the horizontal sum.

Add implementations that handle both the X86ISD::PSADBW nodes and the INTRINSIC_WO_CHAIN intrinsics (pre-legalization).
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