[Bug rtl-optimization/113597] [14 Regression] aarch64: Significant code quality regression since r14-8346-ga98d5130a6dcff

["acoplan at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113597

--- Comment #9 from Alex Coplan <acoplan at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #8)
> (In reply to Alex Coplan from comment #7)
> > I expect the store pairs come from memcpy lowering/expansion in the aarch64
> > backend, that is the only way we get store pairs so early in the RTL
> > pipeline IIRC.
> 
> In this case, memset is more likely.

Right, yeah.  I was using "memcpy lowering" to refer to all the
mem{cpy,set,move} expansion we have in the backend.

> 
> Either:
> for (int i = 0; i < j; i++)
>     m[i] = vdupq_n_f32(0.F);
> Or
> for (int i = 0; i < l; i++)
>     n[i] = vdupq_n_f32(0.F);