[Bug rtl-optimization/113597] [14/15 Regression] aarch64: Significant code quality regression since r14-8346-ga98d5130a6dcff

[pinskia at gcc dot gnu.org]

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

--- Comment #17 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #16)
> Note trunk can do better IPA CP and replace the argument g with 0.

Actually that is not the reason why optimizes down to this. 
r[4] = float32x4_t{b[5] - c[3]};

GCC is able to figure this is always `{0,0,0,0};`