It wasn't supposed to be enabled and appearantly copying around the checking messed up the condition.
Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed. 2021-01-05 Richard Biener <rguent...@suse.de> PR tree-optimization/98428 * tree-vect-slp.c (vect_build_slp_tree_1): Properly reject vector lane extracts for loop vectorization. --- gcc/tree-vect-slp.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/gcc/tree-vect-slp.c b/gcc/tree-vect-slp.c index 2c2cf637e73..67aaa7b0a6a 100644 --- a/gcc/tree-vect-slp.c +++ b/gcc/tree-vect-slp.c @@ -1096,11 +1096,10 @@ vect_build_slp_tree_1 (vec_info *vinfo, unsigned char *swap, && rhs_code == BIT_FIELD_REF) { tree vec = TREE_OPERAND (gimple_assign_rhs1 (stmt), 0); - if (TREE_CODE (vec) != SSA_NAME + if (!is_a <bb_vec_info> (vinfo) + || TREE_CODE (vec) != SSA_NAME || !types_compatible_p (vectype, TREE_TYPE (vec))) { - if (is_a <bb_vec_info> (vinfo) && i != 0) - continue; if (dump_enabled_p ()) dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location, "Build SLP failed: " -- 2.26.2