I've looked into this a bit more, and find the problem in my code is that
d15
isn't preserved, as it's not in the set of saved FP registers. The code that
this patch re-adds works because it preserves d15 by iterating through the
saved
FP registers linearly, though due to this, it fails to preserve d28.
I've yet to discover why it's sensitive to d15, however, as that's a
register
we've reserved for 0.0.
https://codereview.chromium.org/389583003/
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