On Thu, Aug 24, 2023 at 05:47:09PM +0200, Richard Biener via Gcc-patches wrote:
> > Do you think that the pass is worthy of inclusion into upstream GCC? What
> > are
> > some things that I should change? Should I try to put the pass in different
> > places in passes.def?
>
> The most obvious places would be right after SSA construction and before RTL
> expansion.
> Can you provide measurements for those positions?
> Can the pass somehow be used as part of propagations like during value
> numbering?
Could the new file be called gimple-ssa-sccp.cc or something similar?
Removing some PHIs is nice, but it would be also interesting to know what
are the effects on generated code size and/or performance.
And also if it has any effects on debug information coverage.
Jakub
