kc3-lang/angle/src/compiler/translator/BuiltInFunctionEmulatorHLSL.cpp

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• Hash : 35bcad42
  Author :
  Date : 2017-06-06T15:12:27
  

  Optimize builtin function emulator class.
  
  This refactor uses a generator to produce static arrays instead of
  using a bunch of std::map inserting statements. It speeds up shader
  translation because every shader compile would create and tear down
  this table.
  
  Currently it is implemented as a flat array, but in the future we
  could use compile-time hashing to implement faster lookup.
  
  BUG=chromium:697758
  
  Change-Id: I689f7de4d9b2c8c76095bb313f4c040116fc61d2
  Reviewed-on: https://chromium-review.googlesource.com/521226
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  Reviewed-by: Olli Etuaho <oetuaho@nvidia.com>
  

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• src/compiler/translator/BuiltInFunctionEmulatorHLSL.cpp

• //
  // Copyright (c) 2014 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  #include "angle_gl.h"
  #include "compiler/translator/BuiltInFunctionEmulator.h"
  #include "compiler/translator/BuiltInFunctionEmulatorHLSL.h"
  #include "compiler/translator/SymbolTable.h"
  #include "compiler/translator/VersionGLSL.h"
  
  namespace sh
  {
  
  // Defined in emulated_builtin_functions_hlsl_autogen.cpp.
  const char *FindHLSLFunction(const FunctionId &functionID);
  
  void InitBuiltInIsnanFunctionEmulatorForHLSLWorkarounds(BuiltInFunctionEmulator *emu,
                                                          int targetGLSLVersion)
  {
      if (targetGLSLVersion < GLSL_VERSION_130)
          return;
  
      TType *float1 = new TType(EbtFloat);
      TType *float2 = new TType(EbtFloat, 2);
      TType *float3 = new TType(EbtFloat, 3);
      TType *float4 = new TType(EbtFloat, 4);
  
      emu->addEmulatedFunction(EOpIsNan, float1,
                               "bool webgl_isnan_emu(float x)\n"
                               "{\n"
                               "    return (x > 0.0 || x < 0.0) ? false : x != 0.0;\n"
                               "}\n"
                               "\n");
  
      emu->addEmulatedFunction(
          EOpIsNan, float2,
          "bool2 webgl_isnan_emu(float2 x)\n"
          "{\n"
          "    bool2 isnan;\n"
          "    for (int i = 0; i < 2; i++)\n"
          "    {\n"
          "        isnan[i] = (x[i] > 0.0 || x[i] < 0.0) ? false : x[i] != 0.0;\n"
          "    }\n"
          "    return isnan;\n"
          "}\n");
  
      emu->addEmulatedFunction(
          EOpIsNan, float3,
          "bool3 webgl_isnan_emu(float3 x)\n"
          "{\n"
          "    bool3 isnan;\n"
          "    for (int i = 0; i < 3; i++)\n"
          "    {\n"
          "        isnan[i] = (x[i] > 0.0 || x[i] < 0.0) ? false : x[i] != 0.0;\n"
          "    }\n"
          "    return isnan;\n"
          "}\n");
  
      emu->addEmulatedFunction(
          EOpIsNan, float4,
          "bool4 webgl_isnan_emu(float4 x)\n"
          "{\n"
          "    bool4 isnan;\n"
          "    for (int i = 0; i < 4; i++)\n"
          "    {\n"
          "        isnan[i] = (x[i] > 0.0 || x[i] < 0.0) ? false : x[i] != 0.0;\n"
          "    }\n"
          "    return isnan;\n"
          "}\n");
  }
  
  void InitBuiltInFunctionEmulatorForHLSL(BuiltInFunctionEmulator *emu)
  {
      TType *int1   = new TType(EbtInt);
      TType *int2   = new TType(EbtInt, 2);
      TType *int3   = new TType(EbtInt, 3);
      TType *int4   = new TType(EbtInt, 4);
      TType *uint1  = new TType(EbtUInt);
      TType *uint2  = new TType(EbtUInt, 2);
      TType *uint3  = new TType(EbtUInt, 3);
      TType *uint4  = new TType(EbtUInt, 4);
  
      emu->addFunctionMap(FindHLSLFunction);
  
      // (a + b2^16) * (c + d2^16) = ac + (ad + bc) * 2^16 + bd * 2^32
      // Also note that below, a * d + ((a * c) >> 16) is guaranteed not to overflow, because:
      // a <= 0xffff, d <= 0xffff, ((a * c) >> 16) <= 0xffff and 0xffff * 0xffff + 0xffff = 0xffff0000
      FunctionId umulExtendedUint1 = emu->addEmulatedFunction(
          EOpUmulExtended, uint1, uint1, uint1, uint1,
          "void webgl_umulExtended_emu(uint x, uint y, out uint msb, out uint lsb)\n"
          "{\n"
          "    lsb = x * y;\n"
          "    uint a = (x & 0xffffu);\n"
          "    uint b = (x >> 16);\n"
          "    uint c = (y & 0xffffu);\n"
          "    uint d = (y >> 16);\n"
          "    uint ad = a * d + ((a * c) >> 16);\n"
          "    uint bc = b * c;\n"
          "    uint carry = uint(ad > (0xffffffffu - bc));\n"
          "    msb = ((ad + bc) >> 16) + (carry << 16) + b * d;\n"
          "}\n");
      emu->addEmulatedFunctionWithDependency(
          umulExtendedUint1, EOpUmulExtended, uint2, uint2, uint2, uint2,
          "void webgl_umulExtended_emu(uint2 x, uint2 y, out uint2 msb, out uint2 lsb)\n"
          "{\n"
          "    webgl_umulExtended_emu(x.x, y.x, msb.x, lsb.x);\n"
          "    webgl_umulExtended_emu(x.y, y.y, msb.y, lsb.y);\n"
          "}\n");
      emu->addEmulatedFunctionWithDependency(
          umulExtendedUint1, EOpUmulExtended, uint3, uint3, uint3, uint3,
          "void webgl_umulExtended_emu(uint3 x, uint3 y, out uint3 msb, out uint3 lsb)\n"
          "{\n"
          "    webgl_umulExtended_emu(x.x, y.x, msb.x, lsb.x);\n"
          "    webgl_umulExtended_emu(x.y, y.y, msb.y, lsb.y);\n"
          "    webgl_umulExtended_emu(x.z, y.z, msb.z, lsb.z);\n"
          "}\n");
      emu->addEmulatedFunctionWithDependency(
          umulExtendedUint1, EOpUmulExtended, uint4, uint4, uint4, uint4,
          "void webgl_umulExtended_emu(uint4 x, uint4 y, out uint4 msb, out uint4 lsb)\n"
          "{\n"
          "    webgl_umulExtended_emu(x.x, y.x, msb.x, lsb.x);\n"
          "    webgl_umulExtended_emu(x.y, y.y, msb.y, lsb.y);\n"
          "    webgl_umulExtended_emu(x.z, y.z, msb.z, lsb.z);\n"
          "    webgl_umulExtended_emu(x.w, y.w, msb.w, lsb.w);\n"
          "}\n");
  
      // The imul emulation does two's complement negation on the lsb and msb manually in case the
      // result needs to be negative.
      // TODO(oetuaho): Note that this code doesn't take one edge case into account, where x or y is
      // -2^31. abs(-2^31) is undefined.
      FunctionId imulExtendedInt1 = emu->addEmulatedFunctionWithDependency(
          umulExtendedUint1, EOpImulExtended, int1, int1, int1, int1,
          "void webgl_imulExtended_emu(int x, int y, out int msb, out int lsb)\n"
          "{\n"
          "    uint unsignedMsb;\n"
          "    uint unsignedLsb;\n"
          "    bool negative = (x < 0) != (y < 0);\n"
          "    webgl_umulExtended_emu(uint(abs(x)), uint(abs(y)), unsignedMsb, unsignedLsb);\n"
          "    lsb = asint(unsignedLsb);\n"
          "    msb = asint(unsignedMsb);\n"
          "    if (negative)\n"
          "    {\n"
          "        lsb = ~lsb;\n"
          "        msb = ~msb;\n"
          "        if (lsb == 0xffffffff)\n"
          "        {\n"
          "            lsb = 0;\n"
          "            msb += 1;\n"
          "        }\n"
          "        else\n"
          "        {\n"
          "            lsb += 1;\n"
          "        }\n"
          "    }\n"
          "}\n");
      emu->addEmulatedFunctionWithDependency(
          imulExtendedInt1, EOpImulExtended, int2, int2, int2, int2,
          "void webgl_imulExtended_emu(int2 x, int2 y, out int2 msb, out int2 lsb)\n"
          "{\n"
          "    webgl_imulExtended_emu(x.x, y.x, msb.x, lsb.x);\n"
          "    webgl_imulExtended_emu(x.y, y.y, msb.y, lsb.y);\n"
          "}\n");
      emu->addEmulatedFunctionWithDependency(
          imulExtendedInt1, EOpImulExtended, int3, int3, int3, int3,
          "void webgl_imulExtended_emu(int3 x, int3 y, out int3 msb, out int3 lsb)\n"
          "{\n"
          "    webgl_imulExtended_emu(x.x, y.x, msb.x, lsb.x);\n"
          "    webgl_imulExtended_emu(x.y, y.y, msb.y, lsb.y);\n"
          "    webgl_imulExtended_emu(x.z, y.z, msb.z, lsb.z);\n"
          "}\n");
      emu->addEmulatedFunctionWithDependency(
          imulExtendedInt1, EOpImulExtended, int4, int4, int4, int4,
          "void webgl_imulExtended_emu(int4 x, int4 y, out int4 msb, out int4 lsb)\n"
          "{\n"
          "    webgl_imulExtended_emu(x.x, y.x, msb.x, lsb.x);\n"
          "    webgl_imulExtended_emu(x.y, y.y, msb.y, lsb.y);\n"
          "    webgl_imulExtended_emu(x.z, y.z, msb.z, lsb.z);\n"
          "    webgl_imulExtended_emu(x.w, y.w, msb.w, lsb.w);\n"
          "}\n");
  }
  
  }  // namespace sh
  

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