src/mesa/x86/mmx_blendtmp.h

   1 /*
   2  * Written by José Fonseca <j_r_fonseca@yahoo.co.uk>
   3  */
   4
   5
   6 /*
   7  * void _mesa_mmx_blend( GLcontext *ctx,
   8  *                       GLuint n,
   9  *                       const GLubyte mask[],
  10  *                       GLchan rgba[][4],
  11  *                       CONST GLchan dest[][4] )
  12  *
  13  */
  14 ALIGNTEXT16
  15 GLOBL GLNAME( TAG(_mesa_mmx_blend) )
  16
  17 GLNAME( TAG(_mesa_mmx_blend) ):
  18
  19     PUSH_L     ( EBP )
  20     MOV_L      ( ESP, EBP )
  21     PUSH_L     ( ESI )
  22     PUSH_L     ( EDI )
  23     PUSH_L     ( EBX )
  24
  25     MOV_L      ( REGOFF(12, EBP), ECX )         /* n */
  26     CMP_L      ( CONST(0), ECX)
  27     JE         ( LLBL ( TAG(GMB_return) ) )
  28
  29     MOV_L      ( REGOFF(16, EBP), EBX )         /* mask */
  30     MOV_L      ( REGOFF(20, EBP), EDI )         /* rgba */
  31     MOV_L      ( REGOFF(24, EBP), ESI )         /* dest */
  32
  33     INIT
  34
  35     TEST_L     ( CONST(4), EDI )                /* align rgba on an 8-byte boundary */
  36     JZ         ( LLBL ( TAG(GMB_align_end) ) )
  37
  38     CMP_B      ( CONST(0), REGIND(EBX) )        /* *mask == 0 */
  39     JE         ( LLBL ( TAG(GMB_align_continue) ) )
  40
  41     /* runin */
  42 #define ONE(x)  x
  43 #define TWO(x)
  44     MAIN
  45 #undef ONE
  46 #undef TWO
  47
  48 LLBL ( TAG(GMB_align_continue) ):
  49
  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 */
  54
  55 LLBL ( TAG(GMB_align_end) ):
  56
  57     CMP_L      ( CONST(2), ECX)
  58     JB         ( LLBL ( TAG(GMB_loop_end) ) )
  59
  60 ALIGNTEXT16
  61 LLBL ( TAG(GMB_loop_begin) ):
  62
  63     CMP_W      ( CONST(0), REGIND(EBX) )        /* *mask == 0 && *(mask + 1) == 0 */
  64     JE         ( LLBL ( TAG(GMB_loop_continue) ) )
  65
  66     /* main loop */
  67 #define ONE(x)
  68 #define TWO(x)  x
  69     MAIN
  70 #undef ONE
  71 #undef TWO
  72
  73 LLBL ( TAG(GMB_loop_continue) ):
  74
  75     DEC_L      ( ECX )
  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        ( LLBL ( TAG(GMB_loop_begin) ) )
  82
  83 LLBL ( TAG(GMB_loop_end) ):
  84
  85     CMP_L      ( CONST(1), ECX )
  86     JB         ( LLBL ( TAG(GMB_done) ) )
  87
  88     CMP_B      ( CONST(0), REGIND(EBX) )        /* *mask == 0 */
  89     JE         ( LLBL ( TAG(GMB_done) ) )
  90
  91     /* runout */
  92 #define ONE(x)  x
  93 #define TWO(x)
  94     MAIN
  95 #undef ONE
  96 #undef TWO
  97
  98 LLBL ( TAG(GMB_done) ):
  99
 100     EMMS
 101
 102 LLBL ( TAG(GMB_return) ):
 103
 104     POP_L      ( EBX )
 105     POP_L      ( EDI )
 106     POP_L      ( ESI )
 107     MOV_L      ( EBP, ESP )
 108     POP_L      ( EBP )
 109     RET
 110
 111 #undef TAG
 112 #undef INIT
 113 #undef MAIN