Sample clang compiled webassembly

hello.c

main() {
  char buf[4096] = { 0 };
  unsigned long long x = 1;
  printf("hello %lld", x);
}

hello.wasm

hello.wast

(module
  (type $FUNCSIG$ii (func (param i32) (result i32)))
  (type $FUNCSIG$iii (func (param i32 i32) (result i32)))
  (import "env" "printf" (func $printf (param i32 i32) (result i32)))
  (table 0 anyfunc)
  (memory $0 1)
  (data (i32.const 4) "  \00\00")
  (data (i32.const 16) "hello %lld\00")
  (export "memory" (memory $0))
  (export "main" (func $main))
  (func $main (result i32)
    (local $0 i32)
    (i32.store offset=4
      (i32.const 0)
      (tee_local $0
        (i32.sub
          (i32.load offset=4
            (i32.const 0)
          )
          (i32.const 16)
        )
      )
    )
    (i64.store
      (get_local $0)
      (i64.const 1)
    )
    (drop
      (call $printf
        (i32.const 16)
        (get_local $0)
      )
    )
    (i32.store offset=4
      (i32.const 0)
      (i32.add
        (get_local $0)
        (i32.const 16)
      )
    )
    (i32.const 0)
  )
)