mov ax, 1.0bf
dw 1.0bf    

;int DB 1,2,3
;intResult DB 0
movzx eax,byte [int]
cvtsi2ss xmm1,eax
movzx eax,byte [int+1]
cvtsi2ss xmm2,eax
addss xmm1,xmm2
cvtss2si eax,xmm1
mov byte [intResult],al
    

upd: Can I define such value (take high word of float32) now without using virtual + load keywords?

my_float = dword 1.0
mov ax,my_float shr 16    

x = (dword 1.0) shr 16  ; not compiled

x = dword 1.0
x = x shr 16  ; ok    

; Define bfloat16 number (high word of 32-bit float number) with optional name
; If fp32l <> 0 (default) then name label is shifted up by a word (to use it for access to 32-bit float value with undefined low word)
macro   df16    n*, name, fp32l=1
{
  local fp32
  if ~ name eq
    if fp32l    
      label name dword at $-2
    else ; ~ fp32l
      label name word at $
    end if ; [~] fp32l
  end if ; ~ name eq
  fp32 = dword (n)
                dw      fp32 shr 16
} ; df16

; Define bfloat16 number (high word of 32-bit float number) with optional name (and not shifted label)
macro   dbf16   n*, name
{
  df16 n, name, 0
} ; dbf16    

What about adding bfloat16 definition support? (https://en.wikipedia.org/wiki/Bfloat16_floating-point_format)

Code:

mov ax, 1.0bf
dw 1.0bf    

mov ax,1.0
mov bx,1.0f
dw 1.0
dw 1.0f
f1 = word 1.0    

mov al,1.0