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Re: [PATCH] Fix PR37870, ICE in extract_bit_field_1
Ian Lance Taylor <iant@google.com> writes:
> We are not supposed to take a subreg of a floating point mode. We
> currently permit word_mode subregs of a floating point value, which is
> probably why your patch works. But we want to get away from that.
> See validate_subeg. Conceptually this is because machines with
> separate floating point registers generally don't have access to the
> individual words in the register, so we wind up forcing the value into
> memory anyhow.
>
> The right choice here may be to somehow push the value into memory.
Or, if there is a larger integer mode, copy the value into a new
register with that mode.
Ian