On 02/01/2017 06:52 PM, Matthew Fortune wrote:
Hi all,
I've copied you as you have each made some significant change to a function
in LRA which I guess makes you de-facto experts.
I've spent a while researching the history of simplify_operand_subreg and
in particular the behaviour for subregs
> If a MEM subreg is neither simplified to an outermode MEM nor reloaded
> in innermode then I believe LRA will never resolve the subreg. Even if that
> is not true I'm fairly certain the addition of the code has changed
> behaviour and that the change is not well understood, as explained above.
Eric Botcazou writes:
> > (r243782 git:856bd6f)
> > This is another case of multiple changes where some were not critical
> > and overall there is a dangerous one here I believe. The primary aim
> > of this change is to reload the address before reloading the inner
> > subreg. This appears to be
> (r243782 git:856bd6f)
> This is another case of multiple changes where some were not critical and
> overall there is a dangerous one here I believe. The primary aim of this
> change is to reload the address before reloading the inner subreg. This
> appears to be a dormant bug since day1 as the
Hi all,
I've copied you as you have each made some significant change to a function
in LRA which I guess makes you de-facto experts.
I've spent a while researching the history of simplify_operand_subreg and
in particular the behaviour for subregs of memory. For my sake if no-one
else here is a
