+    case 0x0faa:    /* rsm */
+      I386_RECORD_ARCH_LIST_ADD_REG (X86_RECORD_EFLAGS_REGNUM);
+      I386_RECORD_ARCH_LIST_ADD_REG (X86_RECORD_REAX_REGNUM);
+      I386_RECORD_ARCH_LIST_ADD_REG (X86_RECORD_RECX_REGNUM);
+      I386_RECORD_ARCH_LIST_ADD_REG (X86_RECORD_REDX_REGNUM);
+      I386_RECORD_ARCH_LIST_ADD_REG (X86_RECORD_REBX_REGNUM);
+      I386_RECORD_ARCH_LIST_ADD_REG (X86_RECORD_RESP_REGNUM);
+      I386_RECORD_ARCH_LIST_ADD_REG (X86_RECORD_REBP_REGNUM);
+      I386_RECORD_ARCH_LIST_ADD_REG (X86_RECORD_RESI_REGNUM);
+      I386_RECORD_ARCH_LIST_ADD_REG (X86_RECORD_REDI_REGNUM);
+      break;
+
+    case 0x0fae:

Is there a comment for this case statement?
Maybe it doesn't need one, but most of the others have one...

+    /* Add prefix to opcode.  */
+    case 0x0f10:
+    case 0x0f11:
+    case 0x0f12:
+    case 0x0f13:
+    case 0x0f14:
+    case 0x0f15:
+    case 0x0f16:
+    case 0x0f17:
+    case 0x0f28:
+    case 0x0f29:
+    case 0x0f2a:
+    case 0x0f2b:
+    case 0x0f2c:
+    case 0x0f2d:
+    case 0x0f2e:
+    case 0x0f2f:
+    case 0x0f38:
+    case 0x0f39:
+    case 0x0f3a:
+    case 0x0f50:
+    case 0x0f51:
+    case 0x0f52:
+    case 0x0f53:
+    case 0x0f54:
+    case 0x0f55:
+    case 0x0f56:
+    case 0x0f57:
+    case 0x0f58:
+    case 0x0f59:
+    case 0x0f5a:
+    case 0x0f5b:
+    case 0x0f5c:
+    case 0x0f5d:
+    case 0x0f5e:
+    case 0x0f5f:
+    case 0x0f60:
+    case 0x0f61:
+    case 0x0f62:
+    case 0x0f63:
+    case 0x0f64:
+    case 0x0f65:
+    case 0x0f66:
+    case 0x0f67:
+    case 0x0f68:
+    case 0x0f69:
+    case 0x0f6a:
+    case 0x0f6b:
+    case 0x0f6c:
+    case 0x0f6d:
+    case 0x0f6e:
+    case 0x0f6f:
+    case 0x0f70:
+    case 0x0f71:
+    case 0x0f72:
+    case 0x0f73:
+    case 0x0f74:
+    case 0x0f75:
+    case 0x0f76:
+    case 0x0f7c:
+    case 0x0f7d:
+    case 0x0f7e:
+    case 0x0f7f:
+    case 0x0fb8:
+    case 0x0fc2:
+    case 0x0fc4:
+    case 0x0fc5:
+    case 0x0fc6:
+    case 0x0fd0:
+    case 0x0fd1:
+    case 0x0fd2:
+    case 0x0fd3:
+    case 0x0fd4:
+    case 0x0fd5:
+    case 0x0fd6:
+    case 0x0fd7:
+    case 0x0fd8:
+    case 0x0fd9:
+    case 0x0fda:
+    case 0x0fdb:
+    case 0x0fdc:
+    case 0x0fdd:
+    case 0x0fde:
+    case 0x0fdf:
+    case 0x0fe0:
+    case 0x0fe1:
+    case 0x0fe2:
+    case 0x0fe3:
+    case 0x0fe4:
+    case 0x0fe5:
+    case 0x0fe6:
+    case 0x0fe7:
+    case 0x0fe8:
+    case 0x0fe9:
+    case 0x0fea:
+    case 0x0feb:
+    case 0x0fec:
+    case 0x0fed:
+    case 0x0fee:
+    case 0x0fef:
+    case 0x0ff0:
+    case 0x0ff1:
+    case 0x0ff2:
+    case 0x0ff3:
+    case 0x0ff4:
+    case 0x0ff5:
+    case 0x0ff6:
+    case 0x0ff7:
+    case 0x0ff8:
+    case 0x0ff9:
+    case 0x0ffa:
+    case 0x0ffb:
+    case 0x0ffc:
+    case 0x0ffd:
+    case 0x0ffe:

There's 114 lines that could be replaced by a single "if", 
just by moving them into the default case block.