[Bug target/124904] [LoopVectorize][AArch64] GCC fails to vectorize conditional store loop with offset access that Clang vectorizes with SVE

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124904

--- Comment #3 from Drea Pinski <pinskia at gcc dot gnu.org> ---
And then `-O3 -march=armv8.5-a+sve -g0 -fno-trapping-math ` can also vectorize
it (so there is a cost model issue with `-march=armv9-a` again.

.L3:
        ld1d    z30.d, p7/z, [x0, x3, lsl 3]
        cmpne   p7.d, p7/z, z30.d, #0
        ld1d    z31.d, p7/z, [x5, x3, lsl 3]
        scvtf   z31.d, p6/m, z31.d
        st1d    z31.d, p7, [x1, x3, lsl 3]
        add     x3, x3, x4
        whilelo p7.d, w3, w2
        b.any   .L3