PR target/62128
* config/i386/i386.c (expand_vec_perm_1): Try expand_vec_perm_palignr
if it expands to a single insn only.
(expand_vec_perm_palignr): Add SINGLE_INSN_ONLY_P argument. If true,
fail unless in_order is true. Add forward declaration.
(expand_vec_perm_vperm2f128): Fix up comment about which permutation
is useful for one_operand_p.
(ix86_expand_vec_perm_const_1): Adjust expand_vec_perm_palignr caller.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@215796 138bc75d-0d04-0410-961f-82ee72b054a4