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

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• Hash : 5fec7ab2
  Author :
  Date : 2018-04-04T11:58:33
  

  Identify functions by unique id in BuiltInFunctionEmulator
  
  Now that unique ids of all builtins are compile-time constants, we can
  use them to look up functions in BuiltInFunctionEmulator. This is
  simpler than using a custom struct with the name and parameters for
  identifying functions.
  
  This requires that we store a reference to a TFunction in those
  TIntermUnary nodes that were created based on a function.
  
  This decreases shader_translator binary size by about 6 KB on Windows.
  
  BUG=angleproject:2267
  BUG=chromium:823856
  TEST=angle_unittests
  
  Change-Id: Idd5a00c772c6f26dd36fdbbfbe161d22ab27c2fe
  Reviewed-on: https://chromium-review.googlesource.com/995372
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Commit-Queue: 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 "compiler/translator/BuiltInFunctionEmulatorHLSL.h"
  #include "angle_gl.h"
  #include "compiler/translator/BuiltInFunctionEmulator.h"
  #include "compiler/translator/VersionGLSL.h"
  #include "compiler/translator/tree_util/BuiltIn_autogen.h"
  
  namespace sh
  {
  
  // Defined in emulated_builtin_functions_hlsl_autogen.cpp.
  const char *FindHLSLFunction(int uniqueId);
  
  void InitBuiltInIsnanFunctionEmulatorForHLSLWorkarounds(BuiltInFunctionEmulator *emu,
                                                          int targetGLSLVersion)
  {
      if (targetGLSLVersion < GLSL_VERSION_130)
          return;
  
      emu->addEmulatedFunction(BuiltInId::isnan_Float1,
                               "bool isnan_emu(float x)\n"
                               "{\n"
                               "    return (x > 0.0 || x < 0.0) ? false : x != 0.0;\n"
                               "}\n"
                               "\n");
  
      emu->addEmulatedFunction(
          BuiltInId::isnan_Float2,
          "bool2 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(
          BuiltInId::isnan_Float3,
          "bool3 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(
          BuiltInId::isnan_Float4,
          "bool4 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)
  {
      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
      emu->addEmulatedFunction(BuiltInId::umulExtended_UInt1_UInt1_UInt1_UInt1,
                               "void 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(
          BuiltInId::umulExtended_UInt1_UInt1_UInt1_UInt1,
          BuiltInId::umulExtended_UInt2_UInt2_UInt2_UInt2,
          "void umulExtended_emu(uint2 x, uint2 y, out uint2 msb, out uint2 lsb)\n"
          "{\n"
          "    umulExtended_emu(x.x, y.x, msb.x, lsb.x);\n"
          "    umulExtended_emu(x.y, y.y, msb.y, lsb.y);\n"
          "}\n");
      emu->addEmulatedFunctionWithDependency(
          BuiltInId::umulExtended_UInt1_UInt1_UInt1_UInt1,
          BuiltInId::umulExtended_UInt3_UInt3_UInt3_UInt3,
          "void umulExtended_emu(uint3 x, uint3 y, out uint3 msb, out uint3 lsb)\n"
          "{\n"
          "    umulExtended_emu(x.x, y.x, msb.x, lsb.x);\n"
          "    umulExtended_emu(x.y, y.y, msb.y, lsb.y);\n"
          "    umulExtended_emu(x.z, y.z, msb.z, lsb.z);\n"
          "}\n");
      emu->addEmulatedFunctionWithDependency(
          BuiltInId::umulExtended_UInt1_UInt1_UInt1_UInt1,
          BuiltInId::umulExtended_UInt4_UInt4_UInt4_UInt4,
          "void umulExtended_emu(uint4 x, uint4 y, out uint4 msb, out uint4 lsb)\n"
          "{\n"
          "    umulExtended_emu(x.x, y.x, msb.x, lsb.x);\n"
          "    umulExtended_emu(x.y, y.y, msb.y, lsb.y);\n"
          "    umulExtended_emu(x.z, y.z, msb.z, lsb.z);\n"
          "    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.
      emu->addEmulatedFunctionWithDependency(
          BuiltInId::umulExtended_UInt1_UInt1_UInt1_UInt1,
          BuiltInId::imulExtended_Int1_Int1_Int1_Int1,
          "void 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"
          "    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(
          BuiltInId::imulExtended_Int1_Int1_Int1_Int1, BuiltInId::imulExtended_Int2_Int2_Int2_Int2,
          "void imulExtended_emu(int2 x, int2 y, out int2 msb, out int2 lsb)\n"
          "{\n"
          "    imulExtended_emu(x.x, y.x, msb.x, lsb.x);\n"
          "    imulExtended_emu(x.y, y.y, msb.y, lsb.y);\n"
          "}\n");
      emu->addEmulatedFunctionWithDependency(
          BuiltInId::imulExtended_Int1_Int1_Int1_Int1, BuiltInId::imulExtended_Int3_Int3_Int3_Int3,
          "void imulExtended_emu(int3 x, int3 y, out int3 msb, out int3 lsb)\n"
          "{\n"
          "    imulExtended_emu(x.x, y.x, msb.x, lsb.x);\n"
          "    imulExtended_emu(x.y, y.y, msb.y, lsb.y);\n"
          "    imulExtended_emu(x.z, y.z, msb.z, lsb.z);\n"
          "}\n");
      emu->addEmulatedFunctionWithDependency(
          BuiltInId::imulExtended_Int1_Int1_Int1_Int1, BuiltInId::imulExtended_Int4_Int4_Int4_Int4,
          "void imulExtended_emu(int4 x, int4 y, out int4 msb, out int4 lsb)\n"
          "{\n"
          "    imulExtended_emu(x.x, y.x, msb.x, lsb.x);\n"
          "    imulExtended_emu(x.y, y.y, msb.y, lsb.y);\n"
          "    imulExtended_emu(x.z, y.z, msb.z, lsb.z);\n"
          "    imulExtended_emu(x.w, y.w, msb.w, lsb.w);\n"
          "}\n");
  }
  
  }  // namespace sh
  

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