inline WebAssembly in emscripten

inline_asm_in_emscripten.cpp

#include <cstdint>
#include <iostream>

int32_t add(int32_t n) {
  int32_t sum;
  __asm (
    "local.get %1\n"
    "i32.const 1\n"
    "i32.add\n"
    "local.set %0"
    : "=r"(sum)
    : "r"(n)
  );  
  return sum;
}

int main() {
  int32_t a;
  std::cin >> a;
  std::cout << add(a) << std::endl;
}