| 0,0 → 1,100 |
|---|
| /* |
| * 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; |
| |
| int e = ebits - 3; |
| |
| float value = 1.0f; |
| |
| value += mbits / 16.0f; |
| |
| value *= exp2f(e); |
| |
| vf_to_float[vf] = value; |
| } |
| } |
| |
| 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)); |
| } |