.686
.model flat
public _float2double
.code
; void float2double(float*f,double*d);
_float2double PROC
push ebp
mov ebp,esp;
push esi;
push edi;
mov esi,[ebp+8] ; pobranie f
mov edi,[ebp+12] ; pobranie d
mov eax,[esi] ; pobranie liczby w float;
mov edx,eax ; kopia w edx
; dobieramy się do wykładnika
shr edx,23 ; przesuwamy w prawo do końca
and edx,000000ffH ; tylko wykładnik - 8b
;-127 + 1023 = zamiana na format double
sub edx,127;
add edx,1023;
shl edx,21 ; będzie w starszym bajcie, mantysa w double: 52 bity, 52-32 = 20
; przesuwamy o 1 więcej, aby zaraz móc dostawić bit znaku z CF
bt eax,31 ; test bitu znaku, bit ląduje w CF
rcr edx,1 ; wrzucamy bit znaku na początek
and eax,007FFFFFH ; wybieramy tylko mantysę
shl eax,3
or edx,eax;
; wynik w edx
mov [edi],dword PTR 0
mov [edi+4],edx;
pop edi
pop esi
pop ebp;
ret
_float2double ENDP
END
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