tree-optimization/121320 - UBSAN error in ao_ref_init_from_vn_reference

The multiplication by BITS_PER_UNIT should be done in poly_offset_int.

	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.

(cherry picked from commit ff6f7d8e005ae94ffd55f1dba727e28531c3daf3)

diff --git a/gcc/tree-ssa-sccvn.cc b/gcc/tree-ssa-sccvn.cc
index 7f2500e5d591df13e6fbc8e81d39fc02fe34cfb4..9bf25c67dc95513c7c824e071d2228e88cfd1512 100644 (file)
--- 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: