On 10/31/2017 03:41 AM, Segher Boessenkool wrote:
> If the user asks for a stack clash probe interval of 64kB, we currently
> generate a "stdu rX,-65536(r1)" instruction. That instruction does not
> exist (the offset is a 16-bit signed number). If the offset is too big
> we should force it into a register and generate a "stdux rX,rY,r1"
> instruction, instead.
>
> Bootstrapped and regression checked on powerpc64-linux {-m32,-m64};
> committing to trunk.
>
>
> Segher
>
>
> 2017-10-31 Segher Boessenkool <seg...@kernel.crsahing.org>
>
> PR target/82674
> * config/rs6000/rs6000.md (allocate_stack): Force update interval
> into a register if it does not fit into an immediate offset field.
:-) That's one I had a fix for. But the issues with large probing
intervals are much more serious. In particular dealing with large
probing intervals for allocations in the prologue is a significantly
tougher problem due to the lack of a free hard reg.
jeff
