Fix PR target/10904 and PR target/13058

[Richard Henderson]

On Tue, Jan 27, 2004 at 02:51:43PM -0500, John David Anglin wrote:
> Is that important?  On the PA, there is no way to extract a subreg
> of a SImode value in a floating point register.

But there is on sparc.  The issue is that (subreg:SI (reg:DI r) x)
is ok for r in f0-f31, but (subreg:DI (reg:SI r) 0) might produce
an unaligned DImode fp register, which cannot be encoded.


r~