rdtsc             858 src/ia32/assembler-ia32.h   void rdtsc();
rdtsc            1179 src/x64/assembler-x64.h   void rdtsc();
rdtsc             117 test/cctest/test-disasm-ia32.cc     __ rdtsc();
rdtsc             109 test/cctest/test-disasm-x64.cc     __ rdtsc();