tree-optimization/106497 - more forward threader can-copy-bb
Commit Message
This adds EDGE_COPY_SRC_JOINER_BLOCK sources to the set of blocks
we need to check we can duplicate.
Bootstrapped and tested on x86-64-unknown-linux-gnu, pushed.
PR tree-optimization/106497
* tree-ssa-threadupdate.cc (fwd_jt_path_registry::update_cfg):
Also verify we can copy EDGE_COPY_SRC_JOINER_BLOCK.
* gcc.dg/torture/pr106497.c: New testcase.
---
gcc/testsuite/gcc.dg/torture/pr106497.c | 20 ++++++++++++++++++++
gcc/tree-ssa-threadupdate.cc | 3 ++-
2 files changed, 22 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/gcc.dg/torture/pr106497.c
new file mode 100644
@@ -0,0 +1,20 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-fno-tree-dce" } */
+
+int n;
+
+__attribute__ ((pure,returns_twice)) int
+bar (void);
+
+int
+foo (int x)
+{
+ n = 0;
+
+ bar ();
+
+ if (x && n)
+ return 0;
+
+ foo (x);
+}
@@ -2679,7 +2679,8 @@ fwd_jt_path_registry::update_cfg (bool may_peel_loop_headers)
{
edge e = (*path)[j]->e;
if (m_removed_edges->find_slot (e, NO_INSERT)
- || ((*path)[j]->type == EDGE_COPY_SRC_BLOCK
+ || (((*path)[j]->type == EDGE_COPY_SRC_BLOCK
+ || (*path)[j]->type == EDGE_COPY_SRC_JOINER_BLOCK)
&& !can_duplicate_block_p (e->src)))
break;
}