On Mon, 5 Dec 2022, Jan-Benedict Glaw wrote:
> On Tue, 2022-11-29 14:30:22 +0100, Richard Biener via Gcc-patches
> wrote:
> > Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.
> >
> > PR tree-optimization/107852
> > * tree-ssa-sccvn.cc (visit_phi): Use equivalences recorded
>
On Tue, 2022-11-29 14:30:22 +0100, Richard Biener via Gcc-patches
wrote:
> Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.
>
> PR tree-optimization/107852
> * tree-ssa-sccvn.cc (visit_phi): Use equivalences recorded
> as predicated values to elide more redundant PH
The following deals with the situation where we have
[local count: 1073741824]:
_5 = bytes.D.25336._M_impl.D.24643._M_start;
_6 = bytes.D.25336._M_impl.D.24643._M_finish;
pretmp_66 = bytes.D.25336._M_impl.D.24643._M_end_of_storage;
if (_5 != _6)
goto ; [70.00%]
else
goto ; [30.00%]
...
[lo
