我正在尝试使用wasm32-unknown-unknown目标构建no_std代码：

#[no_mangle]
pub fn test() {
    let mut idx: i32 = 10;
    let ptr = &mut idx as *mut i32;

    let buffer = unsafe { core::slice::from_raw_parts_mut(ptr, 10) };

    for pixel in buffer.iter_mut() {
        *pixel = 0x7d2b7500;
    }
}

构建之后，我得到了以下WASM二进制代码（我使用wasm2wat工具）：

(module
  (type (;0;) (func))
  (func (;0;) (type 0)
    nop)
  (memory (;0;) 16)
  (global (;0;) i32 (i32.const 1048576))
  (global (;1;) i32 (i32.const 1048576))
  (export "memory" (memory 0))
  (export "test" (func 0))
  (export "__data_end" (global 0))
  (export "__heap_base" (global 1)))

由于某种原因（“nop”），我的test函数为空。
但是当我从外部传递一个原始指针ptr作为test函数参数时：

#[no_mangle]
pub fn test(ptr: *mut i32) {
    let buffer = unsafe { core::slice::from_raw_parts_mut(ptr, 10) };

    for pixel in buffer.iter_mut() {
    *pixel = 0x7d2b7500;
    }
}

WASM代码生成：

(module
(type (;0;) (func (param i32)))
  (func (;0;) (type 0) (param i32)
    local.get 0
    i64.const 9019431323700000000
    i64.store offset=32 align=4
    local.get 0
    i64.const 9019431323700000000
    i64.store offset=24 align=4
    local.get 0
    i64.const 9019431323700000000
    i64.store offset=16 align=4
    local.get 0
    i64.const 9019431323700000000
    i64.store offset=8 align=4
    local.get 0
    i64.const 9019431323700000000
    i64.store align=4)
  (memory (;0;) 16)
  (global (;0;) i32 (i32.const 1048576))
  (global (;1;) i32 (i32.const 1048576))
  (export "memory" (memory 0))
  (export "test" (func 0))
  (export "__data_end" (global 0))
  (export "__heap_base" (global 1)))

为什么会这样？
我需要wasm生成的代码