> 2016-02-19 Segher Boessenkool <seg...@kernel.crashing.org> > > PR 60818/rtl-optimization > * combine.c (combine_remove_reg_equal_equiv_notes_for_regno): > New function. > (try_combine): Call it when SELECT_CC_MODE makes us change the > mode of a pseudo.
This looks like a big hammer to me though. > +/* Remove all REG_EQUAL and REG_EQUIV notes referring to REGNO. This is > + like rtlanal's remove_reg_equal_equiv_notes_for_regno but with some big > + differences, because combine does not keep the DF info up-to-date. > + We do however never add or move these notes during combine, so we can > + still use the DF info as it was at the start of combine to find all > + such notes. */ The comment is wrong, or at least confusing, since distribute_notes does deal with REG_EQUAL and REG_EQUIV notes. -- Eric Botcazou
