Hi all£¬ 

How about the patch sent in May£¿I can modify it if there are any problem.

the benchmark show there are about  30% benefits for commonly used format string.

before opt: 160ns
after opt: 110ns

static void BM_stdio_printf_s(benchmark::State& state) {                                                       
  while (state.KeepRunning()) {                                                                               
        char buf[BUFSIZ];                                                                                         
        snprintf(buf, sizeof(buf), "this is a more typical error message with detail: %s",                         
                "No such file or directory");
    }                                                                                                           
}                                                                                                             
MUSL_BENCHMARK(BM_stdio_printf_s);


Chuang Yin