2 * Written by José Fonseca <j_r_fonseca@yahoo.co.uk>
7 * void _mesa_mmx_blend( struct gl_context *ctx,
9 * const GLubyte mask[],
11 * CONST GLchan dest[][4] )
15 GLOBL
GLNAME( TAG(_mesa_mmx_blend
) )
16 HIDDEN( TAG(_mesa_mmx_blend
) )
17 GLNAME( TAG(_mesa_mmx_blend
) ):
25 MOV_L ( REGOFF(12, EBP
), ECX
) /* n */
26 CMP_L ( CONST(0), ECX
)
27 JE ( LLTAG(GMB_return
) )
29 MOV_L ( REGOFF(16, EBP
), EBX
) /* mask */
30 MOV_L ( REGOFF(20, EBP
), EDI
) /* rgba */
31 MOV_L ( REGOFF(24, EBP
), ESI
) /* dest */
35 TEST_L ( CONST(4), EDI
) /* align rgba on an 8-byte boundary */
36 JZ ( LLTAG(GMB_align_end
) )
38 CMP_B ( CONST(0), REGIND(EBX
) ) /* *mask == 0 */
39 JE ( LLTAG(GMB_align_continue
) )
48 LLTAG(GMB_align_continue
):
50 DEC_L ( ECX
) /* n -= 1 */
51 INC_L ( EBX
) /* mask += 1 */
52 ADD_L ( CONST(4), EDI
) /* rgba += 1 */
53 ADD_L ( CONST(4), ESI
) /* dest += 1 */
57 CMP_L ( CONST(2), ECX
)
58 JB ( LLTAG(GMB_loop_end
) )
61 LLTAG(GMB_loop_begin
):
63 CMP_W ( CONST(0), REGIND(EBX
) ) /* *mask == 0 && *(mask + 1) == 0 */
64 JE ( LLTAG(GMB_loop_continue
) )
73 LLTAG(GMB_loop_continue
):
76 DEC_L ( ECX
) /* n -= 2 */
77 ADD_L ( CONST(2), EBX
) /* mask += 2 */
78 ADD_L ( CONST(8), EDI
) /* rgba += 2 */
79 ADD_L ( CONST(8), ESI
) /* dest += 2 */
80 CMP_L ( CONST(2), ECX
)
81 JAE ( LLTAG(GMB_loop_begin
) )
85 CMP_L ( CONST(1), ECX
)
86 JB ( LLTAG(GMB_done
) )
88 CMP_B ( CONST(0), REGIND(EBX
) ) /* *mask == 0 */
89 JE ( LLTAG(GMB_done
) )