+2005-02-20 Dorit Naishlos <dorit@il.ibm.com>
+
+ PR tree-optimization/19951
+ * tree-vect-analyze.c (vect_analyze_loop_form): Check if loop exit edge
+ is abnormal.
+
2005-02-19 Steven Bosscher <stevenb@suse.de>
PR middle-end/19698
}
/* Make sure we have a preheader basic block. */
- if (!loop->pre_header)
+ if (!loop->pre_header || EDGE_COUNT (loop->pre_header->succs) != 1)
{
+ edge e = loop_preheader_edge (loop);
+ loop_split_edge_with (e, NULL);
+ if (vect_print_dump_info (REPORT_DETAILS, loop_loc))
+ fprintf (vect_dump, "split preheader edge.");
rescan = true;
- loop_split_edge_with (loop_preheader_edge (loop), NULL);
}
/* Make sure there exists a single-predecessor exit bb: */
- if (EDGE_COUNT (loop->exit_edges[0]->dest->preds) != 1)
+ if (EDGE_COUNT (loop->single_exit->dest->preds) != 1)
{
- rescan = true;
- loop_split_edge_with (loop->exit_edges[0], NULL);
+ edge e = loop->single_exit;
+ if (!(e->flags & EDGE_ABNORMAL))
+ {
+ loop_split_edge_with (e, NULL);
+ if (vect_print_dump_info (REPORT_DETAILS, loop_loc))
+ fprintf (vect_dump, "split exit edge.");
+ rescan = true;
+ }
+ else
+ {
+ if (vect_print_dump_info (REPORT_BAD_FORM_LOOPS, loop_loc))
+ fprintf (vect_dump, "not vectorized: abnormal loop exit edge.");
+ return NULL;
+ }
}
if (rescan)