--- Comment #2 from Alexander Monakov <amonakov at gcc dot> ---
We have a pseudo:SI<-hardreg:SI assignment followed by
pseudo:DF<-float(pseudo:SI) conversion, and we substitute the latter through
the former, creating a pseudo:DF<-float(hardreg:SI) insn that fails in recog.

I'm not exactly sure why RA would reject reloading the operand when it's a
hardreg, but happily reload when it's a pseudo. Am I missing something obvious,
or are such constraints written down somewhere?

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