https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64774
Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |arm
Priority|P3 |P5
Status|UNCONFIRMED |NEW
Last reconfirmed| |2015-01-28
Ever confirmed|0 |1
--- Comment #1 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Although the compiler tries to find some common cases, it is generally
infeasible to detect all the possible permutations that exist. Furthermore, in
real code generating common expressions in this way can increase register
pressure and have additional impact on some optimization passes.
I don't hold out much hope of this sort of problem ever being entirely fixed.
