IABSD.fr/xenocara/lib/mesa/src/intel/executor/examples/dp4a.lua

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• Author : jsg
  Date : 2025-06-05 11:23:11
  Hash : 67d6f117
  Message : Import Mesa 25.0.7

• lib/mesa/src/intel/executor/examples/dp4a.lua

• --[[
  
  Execute the example from the Dot Product 4 Accumulate
  instruction as seen in the PRM.
  
      mov (1) r1.0:d 0x0102037F:d
      // (char4)(0x1,0x2,0x3,0x7F)
      mov (1) r2.0:d 50:d
      dp4a (1) r3.0:d r2:d r1:d r1:d
      // r3.0 = 50 + (0x1*0x1 + 0x2*0x2 + 0x3*0x3 + 0x7F*0x7F)
      // = 50 + (1 + 4 + 9 + 16129)
      // = 16193
  
  --]]
  
  check_ver(12)
  
  function DP4A(a, b, c)
    local r = c
    for i = 1, 4 do
      r = r + a[i] * b[i]
    end
    return r
  end
  
  local r = execute {
    src = [[
      @id   g9
  
      @mov  g1  0x0102037F
      @mov  g2  50
  
      dp4a(8)  g3<1>UD  g2<8,8,1>UD  g1<8,8,1>UD  g1<8,8,1>UD  { align1 @1 1Q };
  
      @write g9 g3
      @eot
    ]],
  }
  
  print("expected", DP4A({1,2,3,0x7F}, {1,2,3,0x7F}, 50))
  print("calculated", r[0])