src/cpu/x86/vm/assembler_x86.cpp

*** 2934,2943 ****
--- 2934,2951 ----
    NOT_LP64(assert(dst->has_byte_register(), "must have byte register"));
    (void) prefix_and_encode(dst->encoding(), true);
    emit_arith_b(0xF6, 0xC0, dst, imm8);
  }
  
+ void Assembler::testb(Address dst, int imm8) {
+   InstructionMark im(this);
+   prefix(dst);
+   emit_int8((unsigned char)0xF6);
+   emit_operand(rax, dst, 1);
+   emit_int8(imm8);
+ }
+ 
  void Assembler::testl(Register dst, int32_t imm32) {
    // not using emit_arith because test
    // doesn't support sign-extension of
    // 8bit operands
    int encode = dst->encoding();