======= viair_msize_without_optimizer/input.sol:C =======
EVM assembly:
  mstore(0x40, 0x80)
  jumpi(tag_4, iszero(callvalue))
  tag_5
  tag_2
  jump	// in
tag_5:
tag_4:
  tag_6
  tag_3
  jump	// in
tag_6:
  tag_7
  tag_1
  jump	// in
tag_7:
  dataSize(sub_0)
  dataOffset(sub_0)
  dup3
  codecopy
  dataSize(sub_0)
  dup2
  return
tag_1:
  0x00
  mload(0x40)
  swap1
  pop
  swap1
  jump	// out
tag_2:
  0x00
  dup1
  revert
tag_3:
  jump	// out
stop

sub_0: assembly {
      mstore(0x40, 0x80)
      jumpi(tag_10, lt(calldatasize, 0x04))
      tag_11
      calldataload(0x00)
      tag_1
      jump	// in
    tag_11:
      dup1
      0x26121ff0
      dup2
      sub
      tag_12
      jumpi
      tag_14
      tag_7
      jump	// in
    tag_14:
    tag_12:
      pop
      pop
    tag_10:
      tag_15
      tag_8
      jump	// in
    tag_15:
      jump(tag_16)
    tag_1:
      0x00
      dup2
      0xe0
      shr
      swap1
      pop
      swap2
      swap1
      pop
      jump	// out
    tag_2:
      0x00
      mload(0x40)
      swap1
      pop
      swap1
      jump	// out
    tag_3:
      0x00
      dup1
      revert
    tag_4:
      0x00
      dup1
      revert
    tag_5:
      0x00
      dup2
      dup4
      sub
      slt
      iszero
      tag_22
      jumpi
      tag_23
      tag_4
      jump	// in
    tag_23:
    tag_22:
      pop
      pop
      jump	// out
    tag_6:
      0x00
      dup1
      dup3
      add
      swap1
      pop
      swap2
      swap1
      pop
      jump	// out
    tag_7:
      jumpi(tag_26, iszero(callvalue))
      tag_27
      tag_3
      jump	// in
    tag_27:
    tag_26:
      tag_28
      calldatasize
      0x04
      tag_5
      jump	// in
    tag_28:
      tag_29
      tag_9
      jump	// in
    tag_29:
      tag_30
      tag_2
      jump	// in
    tag_30:
      tag_31
      dup2
      tag_6
      jump	// in
    tag_31:
      dup2
      dup2
      sub
      dup3
      return
    tag_8:
      0x00
      dup1
      revert
    tag_9:
      jump(tag_35)
    tag_34:
      0x00
      dup1
      mload
      swap1
      pop
      swap1
      jump	// out
    tag_35:
      0x00
      dup1
      tag_37
      tag_34
      jump	// in
    tag_37:
      0x00
      mstore
      pop
      pop
      jump	// out
    tag_16:

    auxdata: <AUXDATA REMOVED>
}

Optimized IR:
/// @use-src 0:"viair_msize_without_optimizer/input.sol"
object "C_7" {
    code {
        mstore(64, memoryguard(128))
        if callvalue()
        {
            revert_error_ca66f745a3ce8ff40e2ccaf1ad45db7774001b90d25810abd9040049be7bf4bb()
        }
        constructor_C_7()
        let _1 := allocate_unbounded()
        codecopy(_1, dataoffset("C_7_deployed"), datasize("C_7_deployed"))
        return(_1, datasize("C_7_deployed"))
        function allocate_unbounded() -> memPtr
        { memPtr := mload(64) }
        function revert_error_ca66f745a3ce8ff40e2ccaf1ad45db7774001b90d25810abd9040049be7bf4bb()
        { revert(0, 0) }
        function constructor_C_7()
        { }
    }
    /// @use-src 0:"viair_msize_without_optimizer/input.sol"
    object "C_7_deployed" {
        code {
            mstore(64, memoryguard(128))
            if iszero(lt(calldatasize(), 4))
            {
                let selector := shift_right_224_unsigned(calldataload(0))
                switch selector
                case 0x26121ff0 { external_fun_f_6() }
                default { }
            }
            revert_error_42b3090547df1d2001c96683413b8cf91c1b902ef5e3cb8d9f6f304cf7446f74()
            function shift_right_224_unsigned(value) -> newValue
            { newValue := shr(224, value) }
            function allocate_unbounded() -> memPtr
            { memPtr := mload(64) }
            function revert_error_ca66f745a3ce8ff40e2ccaf1ad45db7774001b90d25810abd9040049be7bf4bb()
            { revert(0, 0) }
            function revert_error_dbdddcbe895c83990c08b3492a0e83918d802a52331272ac6fdb6a7c4aea3b1b()
            { revert(0, 0) }
            function abi_decode_tuple_(headStart, dataEnd)
            {
                if slt(sub(dataEnd, headStart), 0)
                {
                    revert_error_dbdddcbe895c83990c08b3492a0e83918d802a52331272ac6fdb6a7c4aea3b1b()
                }
            }
            function abi_encode_tuple__to__fromStack(headStart) -> tail
            { tail := add(headStart, 0) }
            function external_fun_f_6()
            {
                if callvalue()
                {
                    revert_error_ca66f745a3ce8ff40e2ccaf1ad45db7774001b90d25810abd9040049be7bf4bb()
                }
                abi_decode_tuple_(4, calldatasize())
                fun_f_6()
                let memPos := allocate_unbounded()
                let memEnd := abi_encode_tuple__to__fromStack(memPos)
                return(memPos, sub(memEnd, memPos))
            }
            function revert_error_42b3090547df1d2001c96683413b8cf91c1b902ef5e3cb8d9f6f304cf7446f74()
            { revert(0, 0) }
            function fun_f_6()
            {
                {
                    function usr$f() -> usr$x
                    { usr$x := mload(0) }
                    pop(msize())
                    let usr$x := 0
                    let usr$y := usr$x
                    mstore(0, usr$f())
                }
            }
        }
        data ".metadata" hex"<BYTECODE REMOVED>"
    }
}