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/*
* Copyright © 2021 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 <math.h>
#include <gtest/gtest.h>
#include "util/half_float.h"
#include "util/u_math.h"
/* math.h has some defines for these, but they have some compiler dependencies
* and can potentially raise exceptions.
*/
#define TEST_POS_INF (uif(0x7f800000))
#define TEST_NEG_INF (uif(0xff800000))
#define TEST_NAN (uif(0x7fc00000))
#define HALF_POS_INF 0x7c00
#define HALF_NEG_INF 0xfc00
#define HALF_NAN 0x7e00
#ifndef HAVE_ISSIGNALING
static bool issignaling(float x)
{
uint32_t ui = fui(x);
return (((ui >> 23) & 0xff) == 0xff) && !(ui & (1 << 22));
}
#endif
/* The sign of the bit for signaling is different on some old processors
* (PA-RISC, old MIPS without IEEE-754-2008 support).
*
* Disable the tests on those platforms, because it's not clear how to
* correctly handle NaNs when the CPU and GPU differ in their convention.
*/
#if DETECT_ARCH_HPPA || ((DETECT_ARCH_MIPS || DETECT_ARCH_MIPS64) && !defined __mips_nan2008)
#define IEEE754_2008_NAN 0
#else
#define IEEE754_2008_NAN 1
#endif
/* Sanity test our inf test values */
TEST(half_to_float_test, inf_test)
{
EXPECT_TRUE(isinf(TEST_POS_INF));
EXPECT_TRUE(isinf(TEST_NEG_INF));
}
/* Make sure that our 32-bit float nan test value we're using is a
* non-signaling NaN.
*/
#if IEEE754_2008_NAN
TEST(half_to_float_test, nan_test)
#else
TEST(half_to_float_test, DISABLED_nan_test)
#endif
{
EXPECT_TRUE(isnan(TEST_NAN));
EXPECT_FALSE(issignaling(TEST_NAN));
}
static void
test_half_to_float_limits(float (*func)(uint16_t))
{
/* Positive and negative 0. */
EXPECT_EQ(func(0), 0.0f);
EXPECT_EQ(fui(func(0x8000)), fui(-0.0f));
/* Max normal number */
EXPECT_EQ(func(0x7bff), 65504.0f);
float nan = func(HALF_NAN);
EXPECT_TRUE(isnan(nan));
EXPECT_FALSE(issignaling(nan));
/* inf */
EXPECT_EQ(func(HALF_POS_INF), TEST_POS_INF);
/* -inf */
EXPECT_EQ(func(HALF_NEG_INF), TEST_NEG_INF);
}
/* Test the optionally HW instruction-using path. */
#if IEEE754_2008_NAN
TEST(half_to_float_test, half_to_float_test)
#else
TEST(half_to_float_test, DISABLED_half_to_float_test)
#endif
{
test_half_to_float_limits(_mesa_half_to_float);
}
#if IEEE754_2008_NAN
TEST(half_to_float_test, half_to_float_slow_test)
#else
TEST(half_to_float_test, DISABLED_half_to_float_slow_test)
#endif
{
test_half_to_float_limits(_mesa_half_to_float_slow);
}
static void
test_float_to_half_limits(uint16_t (*func)(float))
{
/* Positive and negative 0. */
EXPECT_EQ(func(0.0f), 0);
EXPECT_EQ(func(-0.0f), 0x8000);
/* Max normal number */
EXPECT_EQ(func(65504.0f), 0x7bff);
uint16_t nan = func(TEST_NAN);
EXPECT_EQ((nan & 0xfc00), 0x7c00); /* exponent is all 1s */
EXPECT_TRUE(nan & (1 << 9)); /* mantissa is quiet nan */
EXPECT_EQ(func(TEST_POS_INF), HALF_POS_INF);
EXPECT_EQ(func(TEST_NEG_INF), HALF_NEG_INF);
}
TEST(float_to_half_test, float_to_half_test)
{
test_float_to_half_limits(_mesa_float_to_half);
}
TEST(float_to_float16_rtne_test, float_to_float16_rtne_test)
{
test_float_to_half_limits(_mesa_float_to_float16_rtne);
}
/* no rtne_slow variant -- rtne is just _mesa_float_to_half(). */
TEST(float_to_float16_rtz_test, float_to_float16_rtz_test)
{
test_float_to_half_limits(_mesa_float_to_float16_rtz);
}
TEST(float_to_float16_rtz_slow_test, float_to_float16_rtz_test)
{
test_float_to_half_limits(_mesa_float_to_float16_rtz_slow);
}
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