[PATCH] tree-optimization/121320 - UBSAN error in ao_ref_init_from_vn_reference

[Richard Biener]

The multiplication by BITS_PER_UNIT should be done in poly_offset_int.

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

        PR tree-optimization/121320
        * tree-ssa-sccvn.cc (ao_ref_init_from_vn_reference): Convert
        op->off to poly_offset_int before multiplying by
        BITS_PER_UNIT.
---
 gcc/tree-ssa-sccvn.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/tree-ssa-sccvn.cc b/gcc/tree-ssa-sccvn.cc
index 45fb79cd8a1..a3117dacb96 100644
--- a/gcc/tree-ssa-sccvn.cc
+++ b/gcc/tree-ssa-sccvn.cc
@@ -1219,7 +1219,7 @@ ao_ref_init_from_vn_reference (ao_ref *ref,
                  offset = 0;
                }
              else
-               offset += pop->off * BITS_PER_UNIT;
+               offset += poly_offset_int (pop->off) * BITS_PER_UNIT;
              op0_p = NULL;
              break;
            }
@@ -1270,7 +1270,7 @@ ao_ref_init_from_vn_reference (ao_ref *ref,
          if (maybe_eq (op->off, -1))
            max_size = -1;
          else
-           offset += op->off * BITS_PER_UNIT;
+           offset += poly_offset_int (op->off) * BITS_PER_UNIT;
          break;
 
        case REALPART_EXPR:
-- 
2.43.0