This bit of defensive programming is costly. Removing thevolatile declaration reduces the running time offsum() for a hundred floats from2.26 usec per loop to1.42 usec per loop.

I'm thinking the x87 issues have mostly faded. If we do need to keep this, can it be wrapped in an#ifdef so that we don't have everyone paying for a problem that almost nobody has?

Linked PRs

• gh-100833: Remove 'volatile' qualifiers in fsum algorithm #100845