===================================================================
@@ -1704,7 +1704,7 @@ vect_is_slp_reduction (loop_vec_info loop_info, gi
tree lhs;
imm_use_iterator imm_iter;
use_operand_p use_p;
- int nloop_uses, size = 0;
+ int nloop_uses, size = 0, nuses;
bool found = false;
if (loop != vect_loop)
@@ -1715,9 +1715,11 @@ vect_is_slp_reduction (loop_vec_info loop_info, gi
while (1)
{
nloop_uses = 0;
+ nuses = 0;
FOR_EACH_IMM_USE_FAST (use_p, imm_iter, lhs)
{
use_stmt = USE_STMT (use_p);
+ nuses++;
if (is_gimple_debug (use_stmt))
continue;
@@ -1739,6 +1741,10 @@ vect_is_slp_reduction (loop_vec_info loop_info, gi
return false;
}
+ /* The statement has no uses. */
+ if (nuses == 0)
+ return false;
+
if (found)
break;