I have a reload/register allocation question and possible patch. While
working on the Aarch64 SIMD ABI[1] I ran into a problem where GCC was
saving and restoring registers that it did not need to. I tracked it
down to lra-constraints.c and its use of
targetm.hard_regno_call_part_clobbered on inst
On 07/11/2018 02:07 PM, Steve Ellcey wrote:
> I have a reload/register allocation question and possible patch. While
> working on the Aarch64 SIMD ABI[1] I ran into a problem where GCC was
> saving and restoring registers that it did not need to. I tracked it
> down to lra-constraints.c and its u
Jeff Law writes:
> On 07/11/2018 02:07 PM, Steve Ellcey wrote:
>> I have a reload/register allocation question and possible patch. While
>> working on the Aarch64 SIMD ABI[1] I ran into a problem where GCC was
>> saving and restoring registers that it did not need to. I tracked it
>> down to lra
On Thu, 2018-07-12 at 07:17 +0100, Richard Sandiford wrote:
>
> So it only calls targetm.hard_regno_call_part_clobbered if such a
> call is known to exist somewhere between the two references to
> regno (although we don't have the calls themselves to hand).
>
> Thanks,
> Richard
Having the speci
