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by anarazel
26 days ago
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> Use of the "h" register slices (bits 8..15) by compilers is thankfully pretty rare -- otherwise this would have been noticed much sooner! It's actually pretty easy to get compilers to use those, you mainly need a bunch of narrow accesses to neighboring memory. The oodle post contains a godbolt link to pretty ordinary c code triggering this. I'd guess that you also need some other conditions (multiple in flight stores, high boost speeds) to trigger this. |
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