--- Comment #1 from Marc Glisse <glisse at gcc dot> ---
With -frounding-math, CCP produces things like:

  _465 = 9.999999974752427078783512115478515625e-7 +

When we have cst1+cst2+cst3, the transformation gives cst1+(cst2+cst3), where
cst2+cst3 does not simplify because of -frounding-math, so it is transformed
again to cst2+(cst1+cst3) or similar, and we cycle. We should not transform
when cst2+cst3 will not simplify (I think there have been similar issues

I can't test or debug anything for a couple weeks, so I may be completely

-Ofast -frounding-math makes little sense to me.

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