kc3-lang/angle/src/common/Float16ToFloat32.py

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• Hash : 9d737966
  Author :
  Date : 2019-08-14T12:25:12
  

  Standardize copyright notices to project style
  
  For all "ANGLE Project" copyrights, standardize to the format specified
  by the style guide. Changes:
  - "Copyright (c)" and "Copyright(c)" changed to just "Copyright".
  - Removed the second half of date ranges ("Y1Y1-Y2Y2"->"Y1Y1").
  - Fixed a small number of files that had no copyright date using the
    initial commit year from the version control history.
  - Fixed one instance of copyright being "The ANGLE Project" rather than
    "The ANGLE Project Authors"
  
  These changes are applied both to the copyright of source file, and
  where applicable to copyright statements that are generated by
  templates.
  
  BUG=angleproject:3811
  
  Change-Id: I973dd65e4ef9deeba232d5be74c768256a0eb2e5
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1754397
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• src/common/Float16ToFloat32.py

• # Copyright 2012 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.
  #
  
  # This script generates a function that converts 16-bit precision floating
  # point numbers to 32-bit.
  # It is based on ftp://ftp.fox-toolkit.org/pub/fasthalffloatconversion.pdf.
  
  #include "common/mathutil.h"
  
  
  def convertMantissa(i):
      if i == 0:
          return 0
      elif i < 1024:
          m = i << 13
          e = 0
          while not (m & 0x00800000):
              e -= 0x00800000
              m = m << 1
          m &= ~0x00800000
          e += 0x38800000
          return m | e
      else:
          return 0x38000000 + ((i - 1024) << 13)
  
  
  def convertExponent(i):
      if i == 0:
          return 0
      elif i in range(1, 31):
          return i << 23
      elif i == 31:
          return 0x47800000
      elif i == 32:
          return 0x80000000
      elif i in range(33, 63):
          return 0x80000000 + ((i - 32) << 23)
      else:
          return 0xC7800000
  
  
  def convertOffset(i):
      if i == 0 or i == 32:
          return 0
      else:
          return 1024
  
  
  print """//
  // Copyright 2012 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.
  //
  
  // This file is automatically generated.
  
  namespace gl
  {
  """
  
  print "const static unsigned g_mantissa[2048] = {"
  for i in range(0, 2048):
      print "    %#010x," % convertMantissa(i)
  print "};\n"
  
  print "const static unsigned g_exponent[64] = {"
  for i in range(0, 64):
      print "    %#010x," % convertExponent(i)
  print "};\n"
  
  print "const static unsigned g_offset[64] = {"
  for i in range(0, 64):
      print "    %#010x," % convertOffset(i)
  print "};\n"
  
  print """float float16ToFloat32(unsigned short h)
  {
      unsigned i32 = g_mantissa[g_offset[h >> 10] + (h & 0x3ff)] + g_exponent[h >> 10];
      return bitCast<float>(i32);
  }
  }
  """
  

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