[PATCH] Merge adjacent stores of constants (PR middle-end/22141)

[Paolo Bonzini]

> I wonder
> if I could trust REG_EQUAL notes containing CONST_INT that forwprop
> generates (and in which case to trust them?  Only if the insn is
> single_set?).

Yes, you can trust them if the insn is single_set.  If it is not, they
probably do not come from fwprop (and I never really understood when are
they valid for non-single_set insns).

Paolo