x86inc.asm用例

%include "x86inc.asm"

;void exam_1(char *pDst, char *refMain, int width, int deltaInt, int deltaFract, int refMainIndex, int l)

; {

; for (l = 0; l < width; l++)

; {

; refMainIndex = l + deltaInt + 1;

; pDst[l] = (char)(((32 - deltaFract) * refMain[refMainIndex] + deltaFract * refMain[refMainIndex + 1] + 16) >> 5);

; }

;}

;void exam_1(char *pDst, char *refMain, int deltaFract, int deltaInt, int width)

cglobal exam_1_asm, 2,7,0

    mov r2d, r2m

    mov r3d, r3m

    mov r6d, r4m

    lea r1, [r1 + r3 + 1]

    mov r4d, 32

    sub r4d, r2d

    ; ***** register map *****

    ; r0 = pDst

    ; r1 = &refMain[deltaInt + 1]

    ; r2 = deltaFract

    ; r4 = 32 - deltaFract

    ; r6 = width

    ; r3 = FREE

    ; r5 = FREE

.loop:

    movzx r3d, byte [r1]

    imul r3d, r4d ; r3d = (32 - deltaFract) * refMain[refMainIndex]

    inc r1

    movzx r5d, byte [r1] ; r5d = deltaFract * refMain[refMainIndex + 1]

    imul r5d, r2d

    lea r3, [r3 + r5 + 16] ; 可以使用'd'后缀的版本，会增加一字节代码长度

    shr r3d, 5

    mov byte [r0], r3b

    inc r0 ; pDst++

    dec r6d

    jnz .loop

    RET