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JIT: Widen self-updates as part of IV widening #106131

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JIT: Widen self-updates as part of IV widening #106131

wants to merge 1 commit into from

Commits on Aug 8, 2024

  1. JIT: Widen self-updates as part of IV widening 

    For certain Intel CPUs it can be a perf regression to keep an IV update
as a 32-bit operation when the IV is later used as a 64-bit register,
despite the fact that the operation should come with explicit zeroing of
the upper bits.

This PR starts detecting and widening some self-updates as part of IV
widening when we can prove that doing the self-update as a 64 bit
operation is safe (i.e. ends up with the same zeroed upper bits).
    @jakobbotsch
    jakobbotsch committed Aug 8, 2024
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