diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr72835.c b/gcc/testsuite/gcc.dg/tree-ssa/pr72835.c
index e69de29..d7d0a8d 100644
--- a/gcc/testsuite/gcc.dg/tree-ssa/pr72835.c
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr72835.c
@@ -0,0 +1,36 @@
+/* PR tree-optimization/72835 */
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+struct struct_1 {
+    unsigned int m1 : 6 ;
+    unsigned int m2 : 24 ;
+    unsigned int m3 : 6 ;
+};
+
+unsigned short var_32 = 0x2d10;
+
+struct struct_1 s1;
+
+void init ()
+{
+  s1.m1 = 4;
+  s1.m2 = 0x7ca4b8;
+  s1.m3 = 24;
+}
+
+void foo ()
+{
+  unsigned int c =
+    ((unsigned int) s1.m2) * (-((unsigned int) s1.m3))
+    + (var_32) * (-((unsigned int) (s1.m1)));
+  if (c != 4098873984)
+    __builtin_abort ();
+}
+
+int main ()
+{
+    init ();
+    foo ();
+    return 0;
+}
diff --git a/gcc/tree-ssa-reassoc.c b/gcc/tree-ssa-reassoc.c
index 7fd7550..b864ed1 100644
--- a/gcc/tree-ssa-reassoc.c
+++ b/gcc/tree-ssa-reassoc.c
@@ -3945,6 +3945,7 @@ rewrite_expr_tree (gimple *stmt, unsigned int opindex,
 	      gimple_assign_set_rhs1 (stmt, oe1->op);
 	      gimple_assign_set_rhs2 (stmt, oe2->op);
 	      update_stmt (stmt);
+	      reset_flow_sensitive_info (lhs);
 	    }
 
 	  if (rhs1 != oe1->op && rhs1 != oe2->op)
@@ -4193,9 +4194,11 @@ rewrite_expr_tree_parallel (gassign *stmt, int width,
 	 others are recreated.  */
       if (i == stmt_num - 1)
 	{
+	  tree lhs = gimple_assign_lhs (stmts[i]);
 	  gimple_assign_set_rhs1 (stmts[i], op1);
 	  gimple_assign_set_rhs2 (stmts[i], op2);
 	  update_stmt (stmts[i]);
+	  reset_flow_sensitive_info (lhs);
 	}
       else
 	{