Remove some dead code

diff --git a/frontends/ast/simplify.cc b/frontends/ast/simplify.cc
index 4baed3bfc482eae31857217e9160f807028d3500..74e7b4675d47cdf49359af46075a7d88940347f7 100644 (file)
--- a/frontends/ast/simplify.cc
+++ b/frontends/ast/simplify.cc
@@ -1828,21 +1828,6 @@ skip_dynamic_range_lvalue_expansion:;
                                goto apply_newNode;
                        }
 
-                       if (str == "\\$rose" || str == "\\$fell")
-                       {
-                               if (GetSize(children) != 1)
-                                       log_error("System function %s got %d arguments, expected 1 at %s:%d.\n",
-                                                       RTLIL::unescape_id(str).c_str(), int(children.size()), filename.c_str(), linenum);
-
-                               if (!current_always_clocked)
-                                       log_error("System function %s is only allowed in clocked blocks at %s:%d.\n",
-                                                       RTLIL::unescape_id(str).c_str(), filename.c_str(), linenum);
-
-                               newNode = new AstNode(AST_EQ, children.at(0)->clone(), clone());
-                               newNode->children.at(1)->str = "\\$past";
-                               goto apply_newNode;
-                       }
-
                        // $anyconst and $anyseq are mapped in AstNode::genRTLIL()
                        if (str == "\\$anyconst" || str == "\\$anyseq") {
                                recursion_counter--;