[Bug target/57896] [4.8 Regression] ICE in expand_expr_real_2

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57896

--- Comment #20 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
So, from quick skim of relevant routines that do gen_reg_rtx, I see:

gen_reg_rtx called only after if (d->testing_p) return true;, thus ok:
expand_vec_perm_blend
expand_vec_perm_pshufb
expand_vec_perm_palignr
expand_vec_perm_vpermq_perm_1
expand_vec_perm_vperm2f128
expand_vec_perm_vperm2f128_vblend
expand_vec_perm_2vperm2f128_vshuf
expand_vec_perm_vpshufb2_vpermq
expand_vec_perm_vpshufb2_vpermq_even_odd
expand_vec_perm_vpshufb4_vpermq2

Does not look at testing_p at all, not ok:
expand_vec_perm_pshufb2
expand_vec_perm_even_odd_1

Not ok:
expand_vec_perm_interleave2
expand_vec_perm_broadcast_1

So, I think we want to fix those 4 routines.