On 14/11/15 00:07, Jason Merrill wrote:
And here's the final patch integrating the delayed folding branch. The general
idea is to mostly avoid folding until the end of the function, at which point we
fold everything as part of genericization. Since many warnings rely on looking
at folded trees, we fold the arguments that we pass to the various warning
functions. To avoid issues with combinatorial explosion, we cache the results
of folding in a hash_map.
In the future we probably want to move many of these warnings into
language-independent code so we can avoid folding for them in the front end; we
also shouldn't need to fold during genericization, but apparently not doing that
leads to optimization regressions.
This is mostly Kai's work; I just cleaned it up a bit to get it ready for the
merge. Marek also helped some. The largest change is hooking into the GTY
machinery to handle throwing away the folding cache rather than trying to do it
manually in various places.
Tested x86_64-pc-linux-gnu, applying to trunk.
Also PR68385 (arm-none-eabi).
