On Fri, Oct 17, 2014 at 06:16:41PM +0400, Evgeny Stupachenko wrote:
> Hi,
>
> Some instructions (like one in PR63534) could have hidden use of PIC register.
> Therefore we need to leave SET_GOT not deleted till reload completed.
> The patch prevents SET_GOT from deleting while PIC register is pseudo.
Just curious, do you emit the init_pic_reg unconditionally at the start of
the function in -fpic mode? What does IRA do in that case, if it sees
a dead setter of something that doesn't seem to be used at that point?
Doesn't it penalize generated code, even if we don't end up with any PIC
references during/after reload?
Jakub
