add const

Author: leekillough

include/RevExt.h

@@ -58,21 +58,21 @@ struct RevExt {
   std::string_view GetName() const { return name; }
 
   /// RevExt: baseline execution function
-  bool Execute( unsigned Inst, const RevInst& Payload, uint16_t HartID, RevRegFile* regFile );
+  bool Execute( unsigned Inst, const RevInst& Payload, uint16_t HartID, RevRegFile* regFile ) const;
 
   /// RevExt: retrieves the extension's instruction table
-  const std::vector<RevInstEntry>& GetTable() { return table; }
+  const std::vector<RevInstEntry>& GetTable() const { return table; }
 
   /// RevExt: retrieves the extension's compressed instruction table
-  const std::vector<RevInstEntry>& GetCTable() { return ctable; }
+  const std::vector<RevInstEntry>& GetCTable() const { return ctable; }
 
 private:
   // RevExt: Randomize instruction costs if randomizeCosts == true
-  void RandomizeCosts( std::vector<RevInstEntry>& table ) {
-    if( feature->GetRandomizeCosts() ) {
+  void RandomizeCosts( std::vector<RevInstEntry>& table ) const {
+    if( feature->GetRandomizeCosts() )
       for( auto& entry : table )
-        entry.cost = RevRand( 1, MAX_COST );
-    }
+        if( entry.cost == 1 )
+          entry.cost = RevRand( 1, MAX_COST );
   }
 
   std::string_view const    name;      ///< RevExt: extension name

src/RevExt.cc

@@ -13,7 +13,7 @@
 namespace SST::RevCPU {
 
 /// Execute an instruction
-bool RevExt::Execute( unsigned Inst, const RevInst& payload, uint16_t HartID, RevRegFile* regFile ) {
+bool RevExt::Execute( unsigned Inst, const RevInst& payload, uint16_t HartID, RevRegFile* regFile ) const {
   bool ( *func )( RevFeature*, RevRegFile*, RevMem*, const RevInst& );
 
   if( payload.compressed ) {