On 13 October 2014 20:43, Jeff Law <law@redhat.com> wrote: ...
I think you want "smode" in the mode_for_size call rather than
"mode", right (both instances)?
No, nregs is the number of hard registers of regno in "mode". Hence
we must use the size of "mode".
To get some case where there's a difference, I was thinking of an
architecture that has partial integer mode registers that can be
grouped together as integral integer mode registers (e.g. one reg is
HImode or PSImode, save_mode would be PSImode, two regs form SImode).
In that case, you'd want something so that you can piece together
"mode", i.e. either GET_MODE_CLASS (mode) or MODE_INT (which happen
to be again the same), but not GET_MODE_CLASS(smode), which would be
MODE_PARTIAL_INT