Predictive commoning fails to preserve alias info for the refs it
creates. The following adds this to see whether it fixes the
observed regression in 436.cactusADM after r15-7665.
Bootstrapped and tested on x86_64-unknown-linux-gnu, will push later.
PR tree-optimization/119044
* tree-predcom.cc (ref_at_iteration): Copy alias info
from the original ref.
---
gcc/tree-predcom.cc | 2 ++
1 file changed, 2 insertions(+)
diff --git a/gcc/tree-predcom.cc b/gcc/tree-predcom.cc
index d45aa3857b9..509d112a0a0 100644
--- a/gcc/tree-predcom.cc
+++ b/gcc/tree-predcom.cc
@@ -234,6 +234,7 @@ along with GCC; see the file COPYING3. If not see
#include "tree-affine.h"
#include "builtins.h"
#include "opts.h"
+#include "tree-ssa-address.h"
/* The maximum number of iterations between the considered memory
references. */
@@ -1824,6 +1825,7 @@ ref_at_iteration (data_reference_p dr, int iter,
tree type = build_aligned_type (TREE_TYPE (ref),
get_object_alignment (ref));
ref = build2 (MEM_REF, type, addr, alias_ptr);
+ copy_ref_info (ref, DR_REF (dr));
if (ref_type)
ref = build3 (ref_code, ref_type, ref, ref_op1, ref_op2);
return ref;
--
2.43.0
