Commit b2abf033 authored by Matt Turner's avatar Matt Turner

i965: Add unit test for float <-> VF conversions.

Using Eric's original VF -> float conversion code to initialize the
table.
parent c37d798e
......@@ -53,11 +53,18 @@ TEST_LIBS = \
TESTS = \
test_eu_compact \
test_vf_float_conversions \
test_vec4_copy_propagation \
test_vec4_register_coalesce
check_PROGRAMS = $(TESTS)
test_vf_float_conversions_SOURCES = \
test_vf_float_conversions.cpp
test_vf_float_conversions_LDADD = \
$(TEST_LIBS) \
$(top_builddir)/src/gtest/libgtest.la
test_vec4_register_coalesce_SOURCES = \
test_vec4_register_coalesce.cpp
test_vec4_register_coalesce_LDADD = \
......
/*
* 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)
{
return (union fu){ .f = f }.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));
}
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