https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80131
Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |segher at gcc dot gnu.org
--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> ---
It may be best to do this in combine.
If we have d = a << (b - c); and a << b does not truncate in the
original mode, write it as d := (a << b) >> c; instead (and then
see if it is actually cheaper, as combine always does).
