[Bug tree-optimization/116583] vectorizable_slp_permutation cannot handle even/odd extract from VLA vector

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116583

--- Comment #7 from Richard Sandiford <rsandifo at gcc dot gnu.org> ---
...actually, they probably don't need to bijective.  I suppose
[0, 0] for two-lane SLP is handled too.