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/*
* Written by José Fonseca <j_r_fonseca@yahoo.co.uk>
*/
/*
* void _mesa_mmx_blend( GLcontext *ctx,
* GLuint n,
* const GLubyte mask[],
* GLchan rgba[][4],
* CONST GLchan dest[][4] )
*
*/
ALIGNTEXT16
GLOBL GLNAME( TAG(_mesa_mmx_blend) )
GLNAME( TAG(_mesa_mmx_blend) ):
PUSH_L ( EBP )
MOV_L ( ESP, EBP )
PUSH_L ( ESI )
PUSH_L ( EDI )
PUSH_L ( EBX )
MOV_L ( REGOFF(12, EBP), ECX ) /* n */
CMP_L ( CONST(0), ECX)
JE ( LLTAG(GMB_return) )
MOV_L ( REGOFF(16, EBP), EBX ) /* mask */
MOV_L ( REGOFF(20, EBP), EDI ) /* rgba */
MOV_L ( REGOFF(24, EBP), ESI ) /* dest */
INIT
TEST_L ( CONST(4), EDI ) /* align rgba on an 8-byte boundary */
JZ ( LLTAG(GMB_align_end) )
CMP_B ( CONST(0), REGIND(EBX) ) /* *mask == 0 */
JE ( LLTAG(GMB_align_continue) )
/* runin */
#define ONE(x) x
#define TWO(x)
MAIN ( EDI, ESI )
#undef ONE
#undef TWO
LLTAG(GMB_align_continue):
DEC_L ( ECX ) /* n -= 1 */
INC_L ( EBX ) /* mask += 1 */
ADD_L ( CONST(4), EDI ) /* rgba += 1 */
ADD_L ( CONST(4), ESI ) /* dest += 1 */
LLTAG(GMB_align_end):
CMP_L ( CONST(2), ECX)
JB ( LLTAG(GMB_loop_end) )
ALIGNTEXT16
LLTAG(GMB_loop_begin):
CMP_W ( CONST(0), REGIND(EBX) ) /* *mask == 0 && *(mask + 1) == 0 */
JE ( LLTAG(GMB_loop_continue) )
/* main loop */
#define ONE(x)
#define TWO(x) x
MAIN ( EDI, ESI )
#undef ONE
#undef TWO
LLTAG(GMB_loop_continue):
DEC_L ( ECX )
DEC_L ( ECX ) /* n -= 2 */
ADD_L ( CONST(2), EBX ) /* mask += 2 */
ADD_L ( CONST(8), EDI ) /* rgba += 2 */
ADD_L ( CONST(8), ESI ) /* dest += 2 */
CMP_L ( CONST(2), ECX )
JAE ( LLTAG(GMB_loop_begin) )
LLTAG(GMB_loop_end):
CMP_L ( CONST(1), ECX )
JB ( LLTAG(GMB_done) )
CMP_B ( CONST(0), REGIND(EBX) ) /* *mask == 0 */
JE ( LLTAG(GMB_done) )
/* runout */
#define ONE(x) x
#define TWO(x)
MAIN ( EDI, ESI )
#undef ONE
#undef TWO
LLTAG(GMB_done):
EMMS
LLTAG(GMB_return):
POP_L ( EBX )
POP_L ( EDI )
POP_L ( ESI )
MOV_L ( EBP, ESP )
POP_L ( EBP )
RET
#undef TAG
#undef LLTAG
#undef INIT
#undef MAIN
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