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) )