https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68027
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2015-10-20
Component|middle-end |tree-optimization
Version|unknown |5.2.0
Ever confirmed|0 |1
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. It's VRP doing this constant propagation and uncprop not undoing
it.
When we do not need to spill 'a' then re-using 'a' would be better but the
optimization is supposed to catch the more frequent case where we'd have to
spill 'a'.
