redundant second cast to integer after already casted int value in asm.js?

[MaxGraey]

https://webassembly.studio/?f=oeg02m22gmq

export function add_div(x: i32): i32 {
  return u32(x) / 100 + x / -100;
}

output:

 function main_add_div($0) {
  $0 = $0 | 0;
  return (($0 | 0) / (-100 | 0) | 0) + (($0 >>> 0) / (100 >>> 0) | 0) | 0 | 0;
 }

but I'm expecting single | 0 at the end:

 function main_add_div($0) {
  $0 = $0 | 0;
  return (($0 | 0) / (-100 | 0) | 0) + (($0 >>> 0) / (100 >>> 0) | 0) | 0;
 }

similar here
but after extra optimizations it normalized to expected. But I guess it could be done earlier without extra opts?

also since asm2js is more like js code and less than asm.js could we simplify some conversion? Like this one:

function i32_trunc_u_f32($0) {
  $0 = Math_fround($0);
  return ~~$0 >>> 0 | 0;
}

could be just:

function i32_trunc_u_f32($0) {
  $0 = Math_fround($0);
  return $0 | 0;
}

And Closure Compiler can't do such optimizations btw

[kripken]

Could be a missing optimization. Those are written in src/tools/wasm2js.cpp:optimizeJS().