Mine

;
; scale_frame( uint16_t *src, uint16_t *dst, int stride, int lshift, int rshift, int width, int height )
;

cglobal scale_frame_sse2, 7,7

;   dst[k] = (src[k] << lshift) + (src[k] >> rshift);

    movdqa xmm0 [r0]
    movdqa xmm1 xmm0
    movd   xmm2 r3
    movd   xmm3 r4
    psllw  xmm0 xmm2
    pslrw  xmm1 xmm3
    padd   xmm0 xmm1
    movdqa [r1] xmm0