HARD_REGNO_CALL_PART_CLOBBERED question (PR53595)

[Georg-Johann Lay]

Hans-Peter Nilsson wrote:
> On Fri, 8 Jun 2012, Georg-Johann Lay wrote:
>> I observed that HARD_REGNO_CALL_PART_CLOBBERED gets called with
>> hard registers that HARD_REGNO_MODE_OK would reject.
>>
>> Is it save to set HARD_REGNO_CALL_PART_CLOBBERED to FALSE for
>> hard registers for which HARD_REGNO_MODE_OK is FALSE?
> 
> IMHO it shouldn't matter.  It seems like a bug that
> HARD_REGNO_CALL_PART_CLOBBERED is called then.
> Maybe an even more sinister bug is the cause?

In fact it matters, see http://gcc.gnu.org/PR53595

What's even more strange is that the fix in PR53595
(return 0 for H_R_C_P_C if !H_R_M_OK) can also fix
http://gcc.gnu.org/PR53615

At least it makes PR53615 no more pop up with the patch.

But from what I see with PR53615 it appears to be some
memory hog or buffer overflow or similar that leads
to this strange artifact.

> (Like the one D.J. is/was on to recently.)
> 
> brgds, H-P


It there a PR? Or changes that went upstreamm after SVR 188257,
i.e. after the first 4.7.1 release candidate was rolled?

Johann