src/gallium/drivers/nouveau/codegen/lib/gm107.asm

   1 .section #gm107_builtin_code
   2 // DIV U32
   3 //
   4 // UNR recurrence (q = a / b):
   5 // look for z such that 2^32 - b <= b * z < 2^32
   6 // then q - 1 <= (a * z) / 2^32 <= q
   7 //
   8 // INPUT:   $r0: dividend, $r1: divisor
   9 // OUTPUT:  $r0: result, $r1: modulus
  10 // CLOBBER: $r2 - $r3, $p0 - $p1
  11 // SIZE:    22 / 14 * 8 bytes
  12 //
  13 gm107_div_u32:
  14    sched 0x7e0 0x7e0 0x7e0
  15    flo u32 $r2 $r1
  16    lop xor 1 $r2 $r2 0x1f
  17    mov $r3 0x1 0xf
  18    sched 0x7e0 0x7e0 0x7e0
  19    shl $r2 $r3 $r2
  20    i2i u32 u32 $r1 neg $r1
  21    imul u32 u32 $r3 $r1 $r2
  22    sched 0x7e0 0x7e0 0x7e0
  23    imad u32 u32 hi $r2 $r2 $r3 $r2
  24    imul u32 u32 $r3 $r1 $r2
  25    imad u32 u32 hi $r2 $r2 $r3 $r2
  26    sched 0x7e0 0x7e0 0x7e0
  27    imul u32 u32 $r3 $r1 $r2
  28    imad u32 u32 hi $r2 $r2 $r3 $r2
  29    imul u32 u32 $r3 $r1 $r2
  30    sched 0x7e0 0x7e0 0x7e0
  31    imad u32 u32 hi $r2 $r2 $r3 $r2
  32    imul u32 u32 $r3 $r1 $r2
  33    imad u32 u32 hi $r2 $r2 $r3 $r2
  34    sched 0x7e0 0x7e0 0x7e0
  35    mov $r3 $r0 0xf
  36    imul u32 u32 hi $r0 $r0 $r2
  37    i2i u32 u32 $r2 neg $r1
  38    sched 0x7e0 0x7e0 0x7e0
  39    imad u32 u32 $r1 $r1 $r0 $r3
  40    isetp ge u32 and $p0 1 $r1 $r2 1
  41    $p0 iadd $r1 $r1 neg $r2
  42    sched 0x7e0 0x7e0 0x7e0
  43    $p0 iadd $r0 $r0 0x1
  44    $p0 isetp ge u32 and $p0 1 $r1 $r2 1
  45    $p0 iadd $r1 $r1 neg $r2
  46    sched 0x7e0 0x7e0 0x7e0
  47    $p0 iadd $r0 $r0 0x1
  48    ret
  49    nop 0
  50
  51 // DIV S32, like DIV U32 after taking ABS(inputs)
  52 //
  53 // INPUT:   $r0: dividend, $r1: divisor
  54 // OUTPUT:  $r0: result, $r1: modulus
  55 // CLOBBER: $r2 - $r3, $p0 - $p3
  56 //
  57 gm107_div_s32:
  58    sched 0x7e0 0x7e0 0x7e0
  59    isetp lt and $p2 0x1 $r0 0 1
  60    isetp lt xor $p3 1 $r1 0 $p2
  61    i2i s32 s32 $r0 abs $r0
  62    sched 0x7e0 0x7e0 0x7e0
  63    i2i s32 s32 $r1 abs $r1
  64    flo u32 $r2 $r1
  65    lop xor 1 $r2 $r2 0x1f
  66    sched 0x7e0 0x7e0 0x7e0
  67    mov $r3 0x1 0xf
  68    shl $r2 $r3 $r2
  69    i2i u32 u32 $r1 neg $r1
  70    sched 0x7e0 0x7e0 0x7e0
  71    imul u32 u32 $r3 $r1 $r2
  72    imad u32 u32 hi $r2 $r2 $r3 $r2
  73    imul u32 u32 $r3 $r1 $r2
  74    sched 0x7e0 0x7e0 0x7e0
  75    imad u32 u32 hi $r2 $r2 $r3 $r2
  76    imul u32 u32 $r3 $r1 $r2
  77    imad u32 u32 hi $r2 $r2 $r3 $r2
  78    sched 0x7e0 0x7e0 0x7e0
  79    imul u32 u32 $r3 $r1 $r2
  80    imad u32 u32 hi $r2 $r2 $r3 $r2
  81    imul u32 u32 $r3 $r1 $r2
  82    sched 0x7e0 0x7e0 0x7e0
  83    imad u32 u32 hi $r2 $r2 $r3 $r2
  84    mov $r3 $r0 0xf
  85    imul u32 u32 hi $r0 $r0 $r2
  86    sched 0x7e0 0x7e0 0x7e0
  87    i2i u32 u32 $r2 neg $r1
  88    imad u32 u32 $r1 $r1 $r0 $r3
  89    isetp ge u32 and $p0 1 $r1 $r2 1
  90    sched 0x7e0 0x7e0 0x7e0
  91    $p0 iadd $r1 $r1 neg $r2
  92    $p0 iadd $r0 $r0 0x1
  93    $p0 isetp ge u32 and $p0 1 $r1 $r2 1
  94    sched 0x7e0 0x7e0 0x7e0
  95    $p0 iadd $r1 $r1 neg $r2
  96    $p0 iadd $r0 $r0 0x1
  97    $p3 i2i s32 s32 $r0 neg $r0
  98    sched 0x7e0 0x7e0 0x7e0
  99    $p2 i2i s32 s32 $r1 neg $r1
 100    ret
 101    nop 0
 102
 103 // STUB
 104 gm107_rcp_f64:
 105 gm107_rsq_f64:
 106    sched 0x7e0 0x7e0 0x7e0
 107    ret
 108    nop 0
 109    nop 0
 110
 111 .section #gm107_builtin_offsets
 112 .b64 #gm107_div_u32
 113 .b64 #gm107_div_s32
 114 .b64 #gm107_rcp_f64
 115 .b64 #gm107_rsq_f64