diff a/src/hotspot/cpu/x86/x86_64.ad b/src/hotspot/cpu/x86/x86_64.ad
--- a/src/hotspot/cpu/x86/x86_64.ad
+++ b/src/hotspot/cpu/x86/x86_64.ad
@@ -2832,11 +2832,11 @@
       OptoReg::Bad, // Op_RegF
       XMM0b_num,    // Op_RegD
       RAX_H_num     // Op_RegL
     };
     // Excluded flags and vector registers.
-    assert(ARRAY_SIZE(hi) == _last_machine_leaf - 6, "missing type");
+    assert(ARRAY_SIZE(hi) == _last_machine_leaf - 8, "missing type");
     return OptoRegPair(hi[ideal_reg], lo[ideal_reg]);
   %}
 %}
 
 //----------ATTRIBUTES---------------------------------------------------------