[PATCH] D113371: [X86] combinePMULH - recognise 'cheap' trunctions via PACKS/PACKUS as well as SEXT/ZEXT

Roman Lebedev via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Tue Nov 30 08:14:34 PST 2021

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lebedev.ri added a comment.

Hm, i'm not sure i'm following, why is the truncation free if the dropped bits are zeros / why it won't be free otherwise?


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https://reviews.llvm.org/D113371

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