call_value pattern

[James Montgomerie]

I am in the process of porting GCC to an architecture on which I need to
know the machine mode of the return value of a call inside the code
generated by the call_value instruction pattern.  Testing the mode of the
register passed as operand 0 does not seem to work (it returns the wrong
mode, presumably because it hasn't actually been used yet), and I'm at a
loss to think of another way.  Can anyone point me in the correct
direction?

Thanks,
Jamie.