On Wed, Nov 19, 2014 at 10:02:18AM +0100, Richard Biener wrote:
> On Tue, 18 Nov 2014, Jakub Jelinek wrote:
> > Apparently, expand_expr with EXPR_WRITE can return
> > a SUBREG with SUBREG_PROMOTED_VAR_P set on it. For
>
> Huh, that looks bogus to me. But of course I know nothing
> (read: not enough) to really tell. Eric?
I've tried to look where it comes from, and it dates back to r2xxx
or so, so forever.
And store_expr has a large:
else if (GET_CODE (target) == SUBREG && SUBREG_PROMOTED_VAR_P (target))
/* If this is a scalar in a register that is stored in a wider mode
than the declared mode, compute the result into its declared mode
and then convert to the wider mode. Our value is the computed
expression. */
handling block. For targets with only word sized operations something
like that actually makes a lot of sense, I have just not been aware of that.
Jakub
