1 files changed, 21 insertions, 0 deletions
diff --git a/src/arch/x86/types.hh b/src/arch/x86/types.hh
index 35799e0c9..2a0da7d65 100644
--- a/src/arch/x86/types.hh
+++ b/src/arch/x86/types.hh
@@ -44,6 +44,7 @@
 
 #include "base/bitunion.hh"
 #include "base/cprintf.hh"
+#include "base/hashmap.hh"
 #include "base/types.hh"
 #include "sim/serialize.hh"
 
@@ -225,6 +226,26 @@ namespace X86ISA
     };
 };
 
+namespace __hash_namespace {
+    template<>
+    struct hash<X86ISA::ExtMachInst> {
+        size_t operator()(const X86ISA::ExtMachInst &emi) const {
+            return (((uint64_t)emi.legacy << 56) |
+                    ((uint64_t)emi.rex  << 48) |
+                    ((uint64_t)emi.modRM << 40) |
+                    ((uint64_t)emi.sib << 32) |
+                    ((uint64_t)emi.opcode.num << 24) |
+                    ((uint64_t)emi.opcode.prefixA << 16) |
+                    ((uint64_t)emi.opcode.prefixB << 8) |
+                    ((uint64_t)emi.opcode.op)) ^
+                    emi.immediate ^ emi.displacement ^
+                    emi.mode ^
+                    emi.opSize ^ emi.addrSize ^
+                    emi.stackSize ^ emi.dispSize;
+        };
+    };
+}
+
 // These two functions allow ExtMachInst to be used with SERIALIZE_SCALAR
 // and UNSERIALIZE_SCALAR.
 template <>