[Bug tree-optimization/43236] -ftree-loop-distribution produces wrong code in reload1.c:delete_output_reload(), bootstrap fails

[amonakov at gcc dot gnu dot org]

------- Comment #8 from amonakov at gcc dot gnu dot org  2010-03-09 16:55 
-------
Given the fact that loop distribution only works for two-bb loops, I think the
fix is to simply take number of latch executions when the stmt is in the latch.

diff --git a/gcc/tree-loop-distribution.c b/gcc/tree-loop-distribution.c
--- a/gcc/tree-loop-distribution.c
+++ b/gcc/tree-loop-distribution.c
@@ -389,6 +391,8 @@ generate_builtin (struct loop *loop, bitmap partition, bool
copy_p)
                goto end;

              write = stmt;
+             if (bb == loop->latch)
+               nb_iter = number_of_latch_executions (loop);
            }
        }
     }


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43236