[PATCH] tree-optimization/114832 - wrong dominator info with vect peeling

[PATCH] tree-optimization/114832 - wrong dominator info with vect peeling

[Richard Biener]

When we update the dominator of the redirected exit after peeling
we check whether the immediate dominator was the loop header rather
than the exit source when we later want to just update it to the
new source.  The following fixes this oversight.

Bootstrap and regtest running on x86_64-unknown-linux-gnu.

Richard.

 	PR tree-optimization/114832
 	* tree-vect-loop-manip.cc (slpeel_tree_duplicate_loop_to_edge_cfg):
 	Fix dominance check.

 	* gcc.dg/vect/pr114832.c: New testcase.
---
  gcc/testsuite/gcc.dg/vect/pr114832.c | 13 +++++++++++++
  gcc/tree-vect-loop-manip.cc          |  2 +-
  2 files changed, 14 insertions(+), 1 deletion(-)
  create mode 100644 gcc/testsuite/gcc.dg/vect/pr114832.c

diff --git a/gcc/testsuite/gcc.dg/vect/pr114832.c b/gcc/testsuite/gcc.dg/vect/pr114832.c
new file mode 100644
index 00000000000..2de07ae22ef
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/pr114832.c
@@ -0,0 +1,13 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-fno-tree-loop-if-convert -fno-tree-loop-distribute-patterns" } */
+
+int a, b, c, d[3];
+void e() {
+  int f, g = 0;
+  for (; g < 3; g++) {
+    if (f || a || b && c) {
+      int h, *i = &h, **j = &i;
+    }
+    d[g] = 0;
+  }
+}
diff --git a/gcc/tree-vect-loop-manip.cc b/gcc/tree-vect-loop-manip.cc
index 8d9b533d50f..43c7881c640 100644
--- a/gcc/tree-vect-loop-manip.cc
+++ b/gcc/tree-vect-loop-manip.cc
@@ -1523,7 +1523,7 @@ slpeel_tree_duplicate_loop_to_edge_cfg (class loop *loop, edge loop_exit,

    exit_dest = exit->dest;
    was_imm_dom = (get_immediate_dominator (CDI_DOMINATORS,
-					  exit_dest) == loop->header ?
+					  exit_dest) == exit->src ?
  		 true : false);

    /* Also copy the pre-header, this avoids jumping through hoops to
-- 
2.25.1