CloverBootloader/rEFIt_UEFI/PlatformIA32/ftol.asm
2021-04-03 13:55:25 +03:00

62 lines
1.5 KiB
NASM

;
; Library/Uefi/IA32/ftol.asm
;
; UEFI implementation IA32 floating point to integer conversion intrinsics
;
.386
_TEXT segment use32 para public 'CODE'
; Export these symbols from this source
public __ftol
public __ftol2
public __ftol2_sse
; __ftol
; Convert floating point to integer
; @param Float The floating point to convert to integer
; @return The integer converted from the floating point
__ftol proc
assume cs:_TEXT
fnstcw word ptr [esp - 2]
mov ax, word ptr [esp - 2]
or ax, 0C00h
mov word ptr [esp - 4], ax
fldcw word ptr [esp - 4]
fistp qword ptr [esp - 12]
fldcw word ptr [esp - 2]
mov eax, dword ptr [esp - 12]
mov edx, dword ptr [esp - 8]
ret
__ftol endp
; __ftol2_sse
; Convert floating point to integer
; @param Float The floating point to convert to integer
; @return The integer converted from the floating point
__ftol2_sse:
; __ftol2
; Convert floating point to integer
; @param Float The floating point to convert to integer
; @return The integer converted from the floating point
__ftol2 proc
assume cs:_TEXT
fnstcw word ptr [esp - 2]
mov ax, word ptr [esp - 2]
or ax, 0C00h
mov word ptr [esp - 4], ax
fldcw word ptr [esp - 4]
fistp qword ptr [esp - 12]
fldcw word ptr [esp - 2]
mov eax, dword ptr [esp - 12]
mov edx, dword ptr [esp - 8]
ret
__ftol2 endp
_TEXT ends
end