Fixed performance bug in ilang parser

diff --git a/frontends/ilang/ilang_parser.y b/frontends/ilang/ilang_parser.y
index b49fd6740194fe4c6ae1fef2827dfeb609669584..8622e0b89ac8e9ebb92a5b9b081baae90cac0c48 100644 (file)
--- a/frontends/ilang/ilang_parser.y
+++ b/frontends/ilang/ilang_parser.y
@@ -50,6 +50,7 @@ USING_YOSYS_NAMESPACE
        int integer;
        YOSYS_NAMESPACE_PREFIX RTLIL::Const *data;
        YOSYS_NAMESPACE_PREFIX RTLIL::SigSpec *sigspec;
+       std::vector<YOSYS_NAMESPACE_PREFIX RTLIL::SigSpec> *rsigspec;
 }
 
 %token <string> TOK_ID TOK_VALUE TOK_STRING
@@ -60,6 +61,7 @@ USING_YOSYS_NAMESPACE
 %token TOK_UPDATE TOK_PROCESS TOK_END TOK_INVALID TOK_EOL TOK_OFFSET
 %token TOK_PARAMETER TOK_ATTRIBUTE TOK_MEMORY TOK_SIZE TOK_SIGNED TOK_UPTO
 
+%type <rsigspec> sigspec_list_reversed
 %type <sigspec> sigspec sigspec_list
 %type <integer> sync_type
 %type <data> constant
@@ -389,16 +391,20 @@ sigspec:
                $$ = $2;
        };
 
-sigspec_list:
-       sigspec_list sigspec {
-               $$ = new RTLIL::SigSpec;
-               $$->append(*$2);
-               $$->append(*$1);
-               delete $1;
+sigspec_list_reversed:
+       sigspec_list_reversed sigspec {
+               $$->push_back(*$2);
                delete $2;
        } |
        /* empty */ {
+               $$ = new std::vector<RTLIL::SigSpec>;
+       };
+
+sigspec_list: sigspec_list_reversed {
                $$ = new RTLIL::SigSpec;
+               for (auto it = $1->rbegin(); it != $1->rend(); it++)
+                       $$->append(*it);
+               delete $1;
        };
 
 conn_stmt: