https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95839
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
OK, with some pending patch applied and
diff --git a/gcc/tree-vect-slp.c b/gcc/tree-vect-slp.c
index ca6bedc9cc8..3d5de39383c 100644
--- a/gcc/tree-vect-slp.c
+++ b/gcc/tree-vect-slp.c
@@ -3130,7 +3130,7 @@ vect_slp_analyze_bb_1 (bb_vec_info bb_vinfo, int n_stmts,
bool &fatal)
return false;
}
- if (BB_VINFO_DATAREFS (bb_vinfo).length () < 2)
+ if (0 && BB_VINFO_DATAREFS (bb_vinfo).length () < 2)
{
if (dump_enabled_p ())
dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
this only fails to vectorize due to cost considerations (considering to
code-generate as I wrote):
0x53b15a0 _1 + _2 1 times vector_stmt costs 12 in body
0x53b15a0 <unknown> 1 times vec_construct costs 8 in prologue
0x53b15a0 <unknown> 1 times vec_construct costs 8 in prologue
0x5412d10 _1 + _2 1 times scalar_stmt costs 12 in body
0x5412d10 _4 + _5 1 times scalar_stmt costs 12 in body
but with -fno-vect-cost-model it "works" as I guessed. For division
we correctly do not vectorize.
