Use more appropriate data structure for extension_table

We know its size at compile time.

2 files changed, 2 insertions, 3 deletions

diff --git a/riscv/isa_parser.cc b/riscv/isa_parser.cc
index 9600a69..d3ef076 100644
--- a/riscv/isa_parser.cc
+++ b/riscv/isa_parser.cc
@@ -28,7 +28,6 @@ static void bad_priv_string(const char* priv)
 }
 
 isa_parser_t::isa_parser_t(const char* str, const char *priv)
-  : extension_table(NUM_ISA_EXTENSIONS, false)
 {
   isa_string = strtolower(str);
   const char* all_subsets = "mafdqchpv";
diff --git a/riscv/isa_parser.h b/riscv/isa_parser.h
index 69df34a..0575d92 100644
--- a/riscv/isa_parser.h
+++ b/riscv/isa_parser.h
@@ -4,7 +4,7 @@
 
 #include "decode.h"
 
-#include <vector>
+#include <bitset>
 #include <string>
 #include <unordered_map>
 
@@ -98,7 +98,7 @@ public:
 protected:
   unsigned max_xlen;
   reg_t max_isa;
-  std::vector<bool> extension_table;
+  std::bitset<NUM_ISA_EXTENSIONS> extension_table;
   std::string isa_string;
   std::unordered_map<std::string, extension_t*> extensions;
 };