https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91017
Bug ID: 91017
Summary: A suspicious code in gcc/tree-vect-stmts.c
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
Target Milestone: ---
3486 new_stmt_info
3487 = vect_finish_stmt_generation (stmt_info, call,
gsi);
3488 if ((i & 1) == 0)
3489 {
3490 prev_res = half_res;
3491 continue;
3492 }
3493 new_temp = make_ssa_name (vec_dest);
3494 gimple *new_stmt
3495 = gimple_build_assign (new_temp, convert_code,
3496 prev_res, half_res);
3497 new_stmt_info
3498 = vect_finish_stmt_generation (stmt_info,
new_stmt,
3499 gsi);
3586 new_stmt_info
3587 = vect_finish_stmt_generation (stmt_info, call, gsi);
3588 if ((j & 1) == 0)
3589 {
3590 prev_res = half_res;
3591 continue;
3592 }
3593 new_temp = make_ssa_name (vec_dest);
3594 gassign *new_stmt = gimple_build_assign (new_temp,
convert_code,
3595 prev_res,
half_res);
3596 new_stmt_info
3597 = vect_finish_stmt_generation (stmt_info, new_stmt,
gsi);
Jakub's comment from https://gcc.gnu.org/ml/gcc-patches/2019-06/msg01659.html:
There should have been
SLP_TREE_VEC_STMTS (slp_node).quick_push (new_stmt_info);
in between for slp_node, or the usual code like:
if (cond_for_first)
STMT_VINFO_VEC_STMT (stmt_info) = *vec_stmt = new_stmt_info;
else
STMT_VINFO_RELATED_STMT (prev_stmt_info) = new_stmt_info;
prev_stmt_info = new_stmt_info;
otherwise. In any case, I think this should be dealt with separately.
