IABSD.fr/xenocara/lib/mesa/src/intel/compiler/test_vf_float_conversions.cpp

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• Author : jsg
  Date : 2018-10-23 06:35:32
  Hash : 19f2c52c
  Message : Merge Mesa 17.3.9 Mesa 18.x needs an ld with build-id for at least the intel code Mesa 18.2 assumes linux only memfd syscalls in intel code Tested by matthieu@, kettenis@ and myself on a variety of hardware and architectures. ok kettenis@

• lib/mesa/src/intel/compiler/test_vf_float_conversions.cpp

• /*
   * Copyright © 2014 Intel Corporation
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice (including the next
   * paragraph) shall be included in all copies or substantial portions of the
   * Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
   * IN THE SOFTWARE.
   */
  
  #include <gtest/gtest.h>
  #include <math.h>
  #include "brw_reg.h"
  
  class vf_float_conversion_test : public ::testing::Test {
     virtual void SetUp();
  
  public:
     float vf_to_float[128];
  };
  
  void vf_float_conversion_test::SetUp() {
     /* 0 is special cased. */
     vf_to_float[0] = 0.0;
  
     for (int vf = 1; vf < 128; vf++) {
        int ebits = (vf >> 4) & 0x7;
        int mbits = vf & 0xf;
  
        float x = 1.0f + mbits / 16.0f;
        int exp = ebits - 3;
  
        vf_to_float[vf] = ldexpf(x, exp);
     }
  }
  
  union fu {
     float f;
     unsigned u;
  };
  
  static unsigned
  f2u(float f)
  {
     union fu fu;
     fu.f = f;
     return fu.u;
  }
  
  TEST_F(vf_float_conversion_test, test_vf_to_float)
  {
     for (int vf = 0; vf < 256; vf++) {
        float expected = vf_to_float[vf % 128];
        if (vf > 127)
           expected = -expected;
  
        EXPECT_EQ(f2u(expected), f2u(brw_vf_to_float(vf)));
     }
  }
  
  TEST_F(vf_float_conversion_test, test_float_to_vf)
  {
     for (int vf = 0; vf < 256; vf++) {
        float f = vf_to_float[vf % 128];
        if (vf > 127)
           f = -f;
  
        EXPECT_EQ(vf, brw_float_to_vf(f));
     }
  }
  
  TEST_F(vf_float_conversion_test, test_special_case_0)
  {
     /* ±0.0f are special cased to the VFs that would otherwise correspond
      * to ±0.125f. Make sure we can't convert these values to VF.
      */
     EXPECT_EQ(brw_float_to_vf(+0.125f), -1);
     EXPECT_EQ(brw_float_to_vf(-0.125f), -1);
  
     EXPECT_EQ(f2u(brw_vf_to_float(brw_float_to_vf(+0.0f))), f2u(+0.0f));
     EXPECT_EQ(f2u(brw_vf_to_float(brw_float_to_vf(-0.0f))), f2u(-0.0f));
  }
  
  TEST_F(vf_float_conversion_test, test_nonrepresentable_float_input)
  {
     EXPECT_EQ(brw_float_to_vf(+32.0f), -1);
     EXPECT_EQ(brw_float_to_vf(-32.0f), -1);
  
     EXPECT_EQ(brw_float_to_vf(+16.5f), -1);
     EXPECT_EQ(brw_float_to_vf(-16.5f), -1);
  
     EXPECT_EQ(brw_float_to_vf(+8.25f), -1);
     EXPECT_EQ(brw_float_to_vf(-8.25f), -1);
  
     EXPECT_EQ(brw_float_to_vf(+4.125f), -1);
     EXPECT_EQ(brw_float_to_vf(-4.125f), -1);
  }