Multi-register location descriptors in dwarf2out.c

[Richard Henderson]

On 07/20/2011 04:55 AM, Richard Sandiford wrote:
> The "loc_result &&" check makes it seem as though we're trying to cope
> with cases XVECLEN is zero, but that only works if the first (dead) load
> of XEXVECP (regs, 0, 0) is optimised away.  Is a length of 0 valid
> in this context?  If not, should we assert for it?

I don't believe a zero length is valid.  An assert would be ok.

> Also, is the size assignment in the loop supposed to always read
> element 0, or is it a typo for XVECEXP (regs, 0, i)?

That sure looks like a typo.  Though I suspect the usual case
has N registers of the same mode, so we didn't notice.


r~