The Most Expensive Instruction Might Be… cmov
A trip through HotSpot's C2 branch-to-cmov heuristic: it measures branch bias, not predictability, and in a tight loop that mismatch is worth up to 2.9x.
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A trip through HotSpot's C2 branch-to-cmov heuristic: it measures branch bias, not predictability, and in a tight loop that mismatch is worth up to 2.9x.