[Bug target/120398] [15/16 Regression] vectorization emits shuffles followed by scalar adds

[amonakov at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120398

--- Comment #2 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Right, aarch64 vectorizes at -O3 to the desired form, but not -O2:

.L3:
        ldr     d1, [x0, x2, lsl 3]
        add     x2, x2, 1
        fmla    v31.2s, v1.2s, v1.2s
        cmp     x1, x2
        bne     .L3